|Exam Name||:||Communication Server 1000 Rls. 5.0 Database Administrator|
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|Updated On||:||April 22, 2019|
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920-331 exam Dumps Source : Communication Server 1000 Rls. 5.0 Database Administrator
Test Code : 920-331
Test Name : Communication Server 1000 Rls. 5.0 Database Administrator
Vendor Name : Nortel
Q&A : 55 Real Questions
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Nortel Networks has launched an up-to-date edition of its conversation Server one thousand (CS one thousand). Nortel describes the CS 1000 as a server-based mostly, full-featured IP PBX which serves as the cornerstone of Nortel enterprise Unified Communications deployments, presenting the advantages of a converged community plus more than 750 world-class telephony aspects.
The Linux-primarily based free up 6.0 of the UC platform offers users freedom to use hardware from Dell, Hewlett-Packard or IBM. The CS a thousand v. 6.0 also integrates with Nortel’s contact center answer, Contact middle 7.0. also new is the MG 1010, a capabilities gateway for centralized communications app provisioning and augmented SIP support.
in conjunction with the brand new unlock, Nortel additionally debuted new IP handsets and introduced enhancements to its conferencing application.related
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newsMicrosoft and Nortel current Alliance Roadmap
both agencies first introduced their collaboration remaining summer season.
The road map contains three new joint options “to dramatically increase company communications via breaking down the barriers between voice, email, quick messaging, multimedia conferencing and different styles of communication,” in line with a statement through the two organisations.
also covered within the announcement are eleven new implementation capabilities from Nortel and the opening of more than 20 joint demonstration facilities the place valued clientele can experience the expertise, the remark endured.
furthermore, both organizations noted they have got signed agreements with dozens of shoppers, and have developed a “pipeline of hundreds of prospects who wish to understand the advantages of unified communications.”
From Microsoft's viewpoint, it is all a part of the business's lengthy-term play to merge every kind of communications and messaging into a single framework. A 12 months ago, the business announced that it turned into merging its change Server group with its real-Time Collaboration (RTC) group, and that it had begun to suppose of both applied sciences comprising a "platform."
the new neighborhood become named the Unified Communications community (UCG) and resides in Microsoft's company Division. The idea for the new neighborhood emanated from a vision of adding continuity to a myriad of communications instruments, applied sciences and modes -- from e-mail and immediate messaging to Voice over web Protocol (VoIP), audio/video and net conferencing -- in a unified manner.
The three new joint solutions announced through the alliance this week are named Unified Communications integrated department, Unified Messaging, and Conferencing.
When it is purchasable within the fourth quarter, UC integrated branch will contain Nortel and Microsoft know-how on a single piece of hardware that grants VoIP and unified communications in faraway workplaces.
Coming a little bit earlier within the second quarter, Unified Messaging will aim to simplify customer deployments, native session initiation protocol (SIP) interoperability between the Nortel conversation Server a thousand and Microsoft alternate Server 2007. The answer includes Nortel professional capabilities for design, deployment and guide.
additionally coming in the fourth quarter, Conferencing will lengthen Nortel Multimedia Conferencing to Microsoft workplace Communicator 2007. It goals to give a single customer event constant throughout purposes corresponding to voice, fast messaging, presence, and audio- and videoconferencing.
This 12 months, the companies additionally plan to extend their latest unified communications solution — a unified desktop and soft cell for VoIP, e mail, immediate messaging and presence — to the Nortel communique Server 2100, a service-grade business telephony product supporting as much as 200,000 clients on a single system, based on company statements.
As for the street map, both corporations have geared up more than 20 joint demonstration centers in North the usa, Europe and Asia, with greater than 100 additional centers scheduled to open by means of midyear.
Nortel has additionally introduced 11 core integration functions to aid purchasers build, deploy and help joint unified communications solutions, including conclusion-to-conclusion task management. Nortel claims it has already trained greater than 2,200 VoIP experts to convey these capabilities and should add greater as deployment ramps up.
Stuart J. Johnston has coated technology, in particular Microsoft, in view that February 1988 for InfoWorld, Computerworld, suggestions Week, and computer World, as well as for commercial enterprise Developer, XML & net capabilities, and .internet magazines.
Avaya day after today will exhibit a highway map that shows how its shoppers – in particular its newly minted Nortel purchasers -- can circulation to unified communications applied sciences devoid of ripping out latest equipment.
Avaya day after today will reveal a highway map that suggests how its customers – in specific its newly minted Nortel consumers -- can movement to unified communications technologies with out ripping out latest gear.
the upward push and fall of Nortel
The plan above all addresses how the enterprise will eliminate overlap between its personal and Nortel's product traces, every now and then favoring Avaya technology, on occasion Nortel's, within the areas of unified communications, contact facilities, small and midsize companies in addition to community infrastructure. on the equal time the plan enables charge discount rates by way of SIP trunking that allows you to let valued clientele ship voice and records over one pipe as opposed to distinct strains and different decreased prices by using centralizing administration of company telephone techniques, Avaya says.
The web influence, says Alan Baratz, senior vp and president for world communication solutions at Avaya, is accelerated capabilities, reduced charges and fewer disruptive exchange.
Promising to achieve a big part of this within the yr is an aggressive aim that may additionally impress Nortel consumers trying to find course to unified communications, says Zeus Kerravala, an analyst with the american neighborhood.
offering on time is critical because former Nortel clients that wish to aggressively pursue UC might not wish to wait and wait, he says. Avaya CEO Kevin Kennedy's time at Cisco may help because of that rival's experience in purchasing other agencies and integrating them smoothly, he says.
"every Nortel customer goes to have a competitive vendor trying to create a route to their personal unified communications solution," he says. Fumbling might not be fatal, Kerravala says, however it could suggest a lack of the miraculous 25% marketshare he says Avaya has amassed in telephony.
As for the specifics of the street map, adding an essential SIP layer into the communications hierarchy can be achieved via Avaya air of mystery, the company's SIP-based mostly conversation application platform that might be sandwiched between communications infrastructure - such as PBXs - and functions - reminiscent of voice, video, messaging, conferencing and mobility.
With air of secrecy in vicinity, legacy Avaya and Nortel PBXs will interoperate with SIP-primarily based VoIP equipment. So Nortel communique Server one thousand IP PBX with air of mystery layered on properly of it might interface with SIP-based telephones plugged into the air of secrecy side of the community. the entire telephones would have CS a thousand aspects and the same button sequencing with a purpose to navigate those elements, Baratz says. additionally, legacy Nortel telephones could be plugged into the charisma facet of the community.
This move will reduce cost of adopting unified communications since it reduces the want for changing PBXs and telephones as well because the charge of retraining conclusion users in how new phones work, he says.
The plan requires utility integration and it won't ensue overnight, Baratz says, nevertheless it can be achieved via the end of this 12 months, possible in November, Baratz says. Nortel's company Communications gadget supervisor will be incorporated into air of mystery, as will Nortel's Agile Communications ambiance (ACE), which permits infusing functions with communications capabilities.
The changes can be dispensed as utility upgrades to latest air of mystery clients.
This method is rarely magnificent, Kerravala says, because charisma changed into designed to embrace an SIP-primarily based apparatus, no count number who the vendor. Integration with Nortel equipment should be simpler as a result of Avaya owns each units of belongings so could make their SIP implementations compatible. necessities-compliant implementations of SIP can fluctuate ample that they do not interoperate, he notes.
within the enviornment of contact centers, Avaya will advance Nortel Contact core utility and then combine it into its current line. Over the next six to nine months, additional revisions of Nortel's Contact middle will put together it to develop into the Avaya offering for midsize organizations in place of Contact center categorical.
After that, the contact middle software from Nortel can be advanced to include architectural features from both Nortel and Avaya traces, then extra developed to scale to enterprise proportions. These two revisions will take six to 9 months each. At that point the software will develop into an upgrade to substitute Avaya's high-end Contact middle Elite.
Baratz says that even earlier than the acquisition of Nortel, Avaya recounted that Nortel's midsize contact middle become greater. "It became very near the most useful product we desired," he says.
Avaya plans to slowly in the reduction of the variety of telephony options obtainable for small and midsize enterprises. It plans to convey legacy Avaya accomplice and imperative 5 key programs in addition to Nortel Norstar methods beneath the umbrella of its IP workplace apparatus.
IP office may be developed to assist Norstar techniques and Nortel enterprise Communications manager hybrid PBXs, and a number of years down the road will substitute them. but meanwhile, Norstar and BCM will continue to be purchasable. "Nothing abrupt goes to ensue here," Baratz says.
Nortel's application Communications gadget SIP equipment will be part of the portfolio as is. There is not any analogous Avaya product.
Nortel brought along a portfolio of switches, network protection and instant apparatus for which Avaya has no competing equipment. Avaya plans to promote these items and enhance them to interoperate extra carefully with its unified communications infrastructure, Baratz says.
for example, the wireless equipment and switches can be tweaked to supply greater complete facts about the presence of cell laborers. at the moment they demonstrate whether someone is available by the use of voice. With greater integration they might say that the individual is attainable on a cellular machine and where it's located, he says.
however Kerravala says that Avaya needs to advance its equipment to be aggressive with other infrastructure providers function for feature, not just to have switches and routers that augment communications. He says Avaya owns 5% of the infrastructure market via advantage of purchasing Nortel and may let it operate as a separate division at once taking over Cisco, HP and others. "or not it's a big installed base," he says.
This story, "Avaya lays out Nortel migration road map," turned into at the start posted at NetworkWorld.com. follow the latest trends in unified communications at community World.gain knowledge of extra about this theme
Avaya broadcasts server to unify communications by the use of SIP
Avaya closes Nortel deal
Nortel's chapter: A yr of principal exchangebe a part of the network World communities on facebook and LinkedIn to touch upon themes that are suitable of intellect.
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In the not so distant past, VMware held a long and commanding lead in the server virtualization space, offering core features that were simply unmatched by the competition. In the past few years, however, competition in virtualization has been fierce, the competitors have drawn near, and VMware has been left with fewer ways to distinguish itself.
The competition may have grown over the years, and VMware may not enjoy quite as large a lead as it once did -- but it still enjoys a lead. With useful improvements to a number of key features, as well as the bundling of functions such as backup and recovery that were previously available separately, vSphere 6 is a worthy addition to the vSphere line. That said, some of the major advances in this version, such as long-distance vMotion, will matter most to larger vSphere shops.Big changes in vSphere 6
The big changes in vSphere 6 revolve around expanded resource limits, enhanced vMotion capabilities, a more complete version of the Linux-based vCenter Server Appliance, storage offloading, and enhancements to the Web client. In addition, VMware has bundled extra technologies into vSphere 6, such as the vCenter Director content library that is used to store ISO images, templates, scripts, OVF files, and other elements, and to automatically distribute them across multiple vCenter servers. The Data Protection Advanced backup and recovery tools are now included as well.
VMware vSphere 6 offers advances in the previously existing Fault Tolerance feature. Fault Tolerance is the technology by which a single VM can have presence on multiple physical servers simultaneously. Should the physical server running the active instance fail, the secondary instance is immediately activated. Without Fault Tolerance, the VM could be automatically restarted on another host, but would require time to detect the failure and boot on the new host. With Fault Tolerance, that step is avoided.
In previous versions of vSphere, Fault Tolerance supported only a single vCPU per VM and four fault-tolerant VMs per host. In vSphere 6, the limits are now four vCPUs per VM and either eight vCPUs or four VMs per host.
The main screen of the new vSphere Web Client looks much more like the Windows client than in previous versions. Note the Recent Tasks window at the bottom.Long-distance vMotion
The vMotion improvements will be more germane to those with multiple data centers spread over wide geographic areas. Prior to vSphere 6, live-migrating VMs over large distances was problematic and required high bandwidth and low-latency connections to succeed. In vSphere 6, the network tolerances have been extended, and vMotions can now be completed over links with 100ms latency or less, requiring 250 megabits of bandwidth per vMotion.
In addition, VMs can be vMotioned between vCenter servers, and with a proper underlying infrastructure, vMotions can be completed without common shared storage. There are restrictions that come with these expanded capabilities, mostly in the form of proper network layouts at each side to allow for proper communication of the VMs on each network.
The ESXi 6.0 hypervisor in vSphere 6 can handle up to 64 physical hosts per cluster, up from 32 hosts, and each instance can now support up to 480 CPUs, 12TB of RAM, and 1,000 VMs. Each VM can now be run with up to 128 vCPUs and 4TB of RAM, with vNUMA hot-add memory capabilities.VMware vCenter Server improvements
On the management side, the vCenter Server Appliance is now feature-complete, on par with its Windows counterpart. Previously, you could run the Linux-based vCenter Server Appliance and manage ESXi hosts, but some of the more advanced features (notably Update Manager) of the Windows-based vCenter Server were not available. As of vSphere 6, the appliance can handle all the tasks that a Windows installation can. This is significant news to those who prefer to not manage a Windows server to run vCenter.
Those who run vCenter Server on Windows will notice that the installation procedure is simplified, though it takes quite a while to complete. All of the moving parts that make up vCenter Server are installed in a single installer action now, including the new Platform Services Controller, which handles SSO, licensing, and certificate management. vCenter Server can be deployed with all components on a single system, or it can be split across multiple systems with the Platform Services Controller and vCenter Server installed separately.
Both vCenter Server for Windows and the vCenter Server Appliance now use a local PostgreSQL database by default, though external Microsoft SQL Server and Oracle databases are also supported on Windows and Oracle databases on the appliance. The switch to PostgreSQL will be important to those running with local databases on earlier versions of vSphere due to the fact that the limitations of the previous Microsoft database are no longer present; thus, local databases can now support 1,000 hosts and 10,000 VMs.
The vSphere Web Client's right-click context menus are still sluggish at times, but overall faster than before.A better Web UI
The first version of the vSphere Web Client was slow, incomplete, and not nearly as fluid as the Windows client, and many users simply refused to work with it. In vSphere 5.5, we saw improvements to the Web client, but it still wasn’t quite to the level of the stand-alone client. In vSphere 6, further usability and speed improvements make the Web client more palatable, as does the addition of support for a broader range of client browsers and operating systems. The client integration tools that allow for important features like VM console access are now available for more platforms, including Mac OS X.
Users of the Web UI will note that it bears a stronger resemblance to the stand-alone client, including the recent tasks pane at the bottom that displays what actions have been taken within the infrastructure. Further, the context menus available via right-click are better laid out, and the overall navigation in the Web client is better than the previous iterations.
The success of the Web client is crucial to VMware. The company has been warning about the impending demise of the stand-alone client for several releases and currently stresses that using the stand-alone client will limit the functionality of vSphere to vSphere 5.0 levels. Features and enhancements from vSphere 5.5 onward are simply not available in the Windows client.
Creating a new VM in vSphere 6 using the vSphere Web Client.VMware Virtual Volumes
VMware introduces a new storage integration concept with vSphere 6 called Virtual Volumes. This is essentially tighter integration with SAN and NAS devices to manage storage operations at the virtual disk level. Virtual Volumes are designed to eliminate the need to carve out large numbers of LUNs or volumes for virtualization hosts and to offload storage-related operations to compatible arrays, with granularity at the virtual disk level.
This integration includes vSphere Storage Policy Based Management, which uses VMware’s storage API to communicate with storage arrays and connects the administration of VMs and storage through to the vSphere UI. Thus, policies can be created and applied to VMs through vCenter while related functions are performed natively by the arrays.
VMware now includes vSphere Data Protection with vSphere Essentials Plus and higher editions of vSphere 6. This is a VM backup and recovery tool that was previously known as vSphere Data Protection Advanced, a separate option. This tool can be used to provide application-aware VM backup and restoration, including support for Microsoft SQL Server, Microsoft Exchange down to the mailbox level, and other popular databases and applications.
The VM overview screen in the new vSphere Web Client.Up from vSphere 5.5
With vSphere 6, VMware offers a collection of welcome features that are now bundled in rather than separate products, advances a number of pre-existing features, and streamlines the installation process. The Web client may still cause more than a few grumbles from those who have been using the stand-alone client from the beginning, but it’s significantly better than in previous iterations.
The advances in vMotion and other cross-site features are of limited use to shops not running multiple interconnected data centers with sufficient dedicated bandwidth to support those features. But as VMware increases the tolerances to lower bandwidth and higher latency, the viability of introducing such features grows.
There’s no mistaking the fact that VMware continues to hold the leadership role in server virtualization, but as the feature sets of the top vendors continue to converge and competing solutions continue to get more robust, we may see more of this feature bundling and simplified licensing in the future. For now, vSphere 6 maintains its place as the cream of the crop.
We examine the performance of EGNOS in Finland, which lies near the northeast periphery of the coverage area, and how this performance can be improved now and in the future.
By Mohammad Zahidul H. Bhuiyan, Heidi Kuusniemi, Auryn Soderini, Salomon Honkala and Simo Marila
“[O]NE ORBIT, WITH A RADIUS OF 42,000 KM, has a period of exactly 24 hours. A body in such an orbit, if its plane coincided with that of the earth’s equator, would revolve with the earth and would thus be stationary above the same spot on the planet. … [A] transmission received from any point on the hemisphere could be broadcast to the whole of the visible face of the globe, and thus the requirements of all possible services would be met.” So wrote writer and futurist Arthur C. Clarke in his October 1945 Wireless World article “Extra-terrestrial Relays: Can Rocket Stations Give World-wide Radio Coverage?,” envisaging the geostationary orbit (GEO) communication satellite.
The first GEO satellite was Syncom III, orbited by the United States in August 1964. Since then, more than 1,000 satellites have been launched into what is known as the Clarke Belt and around 450 are presently active. Most of them are used for civil or military communication. Some are used for direct-to-user TV and radio. Some are used for weather monitoring and other kinds of surveillance. And some are used for augmenting GPS.
While GPS is a remarkable positioning system, its real-time accuracy using L1-frequency pseudorange measurements and its instantaneous integrity are not sufficient for some applications such as aircraft navigation. That is why the U.S. Federal Aviation Administration developed the Wide Area Augmentation System (WAAS), the first satellite-based augmentation system (SBAS). WAAS provides differential correction data and integrity information to GPS users in real time throughout most of North America using a “bent pipe” from a ground station through the GEO satellite to a user’s equipment. It uses a state-space-domain correction approach, which provides corrections for the satellite orbit and clock data transmitted by GPS satellites along with ionospheric propagation delays, all computed from measurements collected by a continent-wide tracking network.
The WAAS concept has been duplicated for other regions. Three other SBASs are in full operation: the European Geostationary Navigation Overlay Service (EGNOS), Japan’s Multifunctional Transport Satellite Satellite-based Augmentation System, and India’s GPS-aided GEO Augmented Navigation System. Russia’s System for Differential Correction and Monitoring is currently in development.
One hitch with GEO satellites whatever their function is their inability to service high latitudes well. At a latitude of 65°, a GEO satellite has an elevation angle of only around 17° at most and at 75°, it’s about 6° or less. Even if a GEO satellite is above the local horizon, communication might be difficult due to the longer signal path length between the satellite and the user.
And so it is with GEO satellites used for SBAS at high latitudes. And there is an additional problem that even if the signals from an SBAS satellite can be received, corrections for some GPS satellites will not be received if they are outside the coverage area of the SBAS tracking network. In this month’s column, we examine the performance of EGNOS in Finland, which lies near the northeast periphery of the EGNOS coverage area, and how this performance can be improved now and in the future.
The European Geostationary Navigation Overlay Service (EGNOS) is the first European-operated satellite navigation system and is a precursor to Galileo, Europe’s independent global navigation satellite system (GNSS), now being deployed. EGNOS, as a satellite-based augmentation system (SBAS) similar to the U.S. Wide Area Augmentation System (WAAS), was developed with the vision to improve the performance of GNSSs, such as GPS and Galileo. At the moment, EGNOS only augments GPS, making it suitable for safety-critical applications such as flying aircraft or navigating ships through narrow channels.
Additionally, EGNOS also supports new applications in many different sectors, such as agriculture (for high-precision spraying of fertilizers), transport (enabling automatic road-tolling or pay-per-use insurance schemes) or even precise personal navigation services for general and specific use.
At present, there are two operational geostationary Earth orbiting (GEO) satellites and until March 2017, these satellites had pseudorandom noise code (PRN) numbers 120 and 136 that simultaneously broadcast EGNOS correction messages to European GPS users. The PRN satellites 120 and 136 are located at 15.5°W and 5.0°E. (Since March, PRN 123 has replaced PRN 136 as one of the operational EGNOS satellites.) The use of EGNOS in the northern Europe is much more challenging than elsewhere in Europe due to the relatively low-elevation angle of some EGNOS satellites as seen from there of about 14° or less.
To improve our understanding of the true performance of EGNOS in Finnish territory, we recently carried out a project entitled “Finland’s EGNOS Monitoring and Performance Evaluation (FEGNOS).” At the northeastern edge of the EGNOS coverage area, the availability of the EGNOS geostationary satellites is compromised due to their low-elevation angles. The Finnish Geospatial Research Institute (FGI) at the National Land Survey of Finland (NLS) maintains a network of 20 permanent GNSS reference stations (FinnRef) all over Finland. The core objective of the FEGNOS project is to evaluate the performance of EGNOS at all of those reference stations to determine if the EGNOS system performance reaches its target in Finland.
Building on our initial research, in this article we report on the analysis of EGNOS performance at all 20 FinnRef stations for a year-long time-frame from November 2015 until October 2016. As it is of importance to compare the performance of EGNOS in a geographic region where EGNOS satellite visibility can be poor due to low-elevation angle, we assessed the performance of EGNOS by comparing the receivers’ own decoded SBAS messages against the SBAS messages provided by the EGNOS Data Access Service (EDAS). The daily EDAS SBAS messages can be freely downloaded from the EDAS server with prior authentication from EDAS. The performance analysis has been carried out for the following three cases:
We carried out the data analysis using the EGNOS analyzing tool called PEGASUS (which originally stood for Prototype EGNOS Analysis Using SAPPHIRE, where SAPPHIRE stands for Satellite and Aircraft Database Programme for System Integrity Research) from Eurocontrol. The results show that the Rx-decoded EGNOS performance is not as good as the performance obtained from the EDAS-offered message corrections. The ongoing experience and knowledge learned from the project has helped to identify weaknesses of the EGNOS system at high northern latitudes.FINNISH NATIONAL GNSS NETWORK, FINNREF
The Finnish National GNSS network, FinnRef, was established on the initiative of the Nordic Geodetic Commission and the director generals of the Nordic Mapping Authorities in the 1990s. FinnRef is part of the Nordic GNSS network, and some stations of the FinnRef network also contribute to the global International GNSS Service (IGS) network and to the European Permanent Network (EPN). The primary function of FinnRef is to offer geodetic-grade GNSS measurements, which have been continuously used for forming and maintaining the national coordinate system (EUREF-FIN). In addition, the FinnRef network is used for many GNSS-related research activities. For example, it is now possible to analyze the positioning performance of different augmentation services via the FinnRef network. Currently, FinnRef also offers an open positioning service based on the differential GNSS (DGNSS) corrections for GPS and GLONASS.
The FinnRef network was renewed during the 2012–2013 timeframe. The renewed FinnRef network now consists of 20 GNSS reference stations, as shown in FIGURE 1. The raw GNSS data from all 20 reference stations is used in the FEGNOS project for EGNOS performance monitoring and analysis.DATA COLLECTION
EGNOS signal monitoring at all FinnRef stations was carried out for one year from Nov. 4, 2015, until Oct. 31, 2016. There are in total about 360 days of data from the 20 stations out of a possible 366 days (2016 was a leap year). The day-of-year (DOY) information for the collected data set is detailed in TABLE 1. No data was available during DOY 233 and 234 of 2016 due to a technical fault at the FinnRef stations. There are 57 days of data from the year 2015 and 303 days of data from 2016.
Each FinnRef station is equipped with a dual-frequency geodetic-grade receiver. Each receiver generates 1-hour binary proprietary data files with a 1-Hz data rate. Data is pushed to the network server and saved at the conclusion of each hour. This means that there are in total 24 data sets for each single day for one single station. All the stations’ binary data files are then organized under one directory, which is named after DOY for that particular year. The FEGNOS data Collection Tool (FEGCoT) was developed in Matlab to collect data every day automatically from all 20 FinnRef stations.
These three steps are followed for automatic data collection:
The combined 24-hour RINEX data file for each station is then processed using the PEGASUS software. The key configuration parameters used in the data analysis are listed in TABLE 2. (Note that airborne accuracy designator refers to specifications in the WAAS Minimum Operational Performance Standards, MOPS.)
Two PEGASUS modules are used for data analysis:
The elevation cut-off angle and the minimum accepted signal-to-noise ratio are kept low so as to have more satellites available for user-position computation. (The European Global Navigation Satellite Systems Agency (GSA) advises that range measurements from EGNOS satellites not be used for position computation.)
A Matlab-script was written to download EDAS-provided daily SBAS messages automatically from the EDAS server. All the PEGASUS-related processing was also executed by a Matlab-based script.ANALYSIS OF RESULTS
We analyzed the EGNOS/GPS performance for the above-mentioned cases with the collected year-long data set from the 20 FinnRef stations. The operational time or uptime of each FinnRef station was monitored throughout the FinnRef network nodes on a daily basis. The average uptime of each station for the one-year data set is shown in FIGURE 2. The “b” in station names indicates one of the two data streams available from each station. The figure shows that most of the stations were up for more than 98% of the time, while only few have uptimes close to 95%.
According to EGNOS Open Service (OS) horizontal and vertical accuracy requirements, the 95% Horizontal Navigation System Error (HNSE) should be less than 3 meters, and the 95% Vertical Navigation System Error (VNSE) should be less than 4 meters in the EGNOS service provision area. The horizontal and vertical position errors at a defined time epoch are computed as the difference between the estimated navigation position and the actual position in horizontal and vertical planes, respectively. The HNSE (95%) and VNSE (95%) were computed for all FinnRef stations with the year-long data set.
The yearly EGNOS performance in terms of HNSE (95%) and VNSE (95%) are shown in FIGURES 3 and 4, respectively. It can be observed that GPS+EGNOS offers significant accuracy improvement compared to GPS stand-alone solutions for all of the stations. Vertical accuracy improvement for EGNOS is greater than the horizontal improvement, mostly due to the better mitigation of ionospheric error compared to stand-alone GPS. We also observed that the Rx-decoded EGNOS performance is not as good as the performance when corrections are obtained from the EDAS server. This might be due to the poor visibility of the EGNOS satellites at northeastern latitudes, which resulted in data aging or partial data loss of EGNOS messages.
In FIGURES 5 and 6, the daily EGNOS performance in terms of VNSE (95%) are shown for the two cases: 1) applying EGNOS corrections from EDAS-provided EGNOS messages, and 2) applying EGNOS corrections from Rx-decoded EGNOS messages, respectively.
For a better understanding, the percentage of EGNOS OS requirement failure when analyzed on a daily basis with EDAS offered corrections is presented in FIGURE 7.
The percentage of EGNOS OS requirement failure was computed from the number of days where the HNSE (95%) ≥3 meters in the case of horizontal navigation solution error and VNSE (95%) ≥ 4 meters in the case of vertical navigation solution error. As observed from Figures 5 and 7, the EDAS offered EGNOS corrections fail to meet the OS requirement only in a few instances. Similarly, the percentage of EGNOS OS requirement failure when analyzed on a daily basis with Rx-decoded corrections is presented in FIGURE 8. It can be easily seen from Figures 6 and 8 that the Rx-decoded EGNOS performance fails to meet the OS requirement in many instances. However, the daily fluctuations are averaged out when the year-long data is taken into account, providing satisfactory performance on the whole.
The yearly EGNOS performance in terms of VNSE (99%) is shown in FIGURE 9.
The three stations with the worst accuracy are highlighted in red in Figure 1. These stations are located on the northeastern border of the EGNOS coverage area. The EGNOS User Differential Range Error Indicator (UDREI) figure for three stations (FINb, VIRb, and SAVb) is shown in FIGURE 10(a), 10(b) and 10(c), respectively.
The stations were chosen so that they represent a wide geographical spread over Finland. According to Figure 10, the satellite UDREI values are in the range of 14 and 15 (marked as blue) at the northeastern edge of the sky plot. A UDREI of 14 indicates “not monitored” and 15 indicates “do not use” for a particular satellite. Even though the satellites had a moderate elevation angle with respect to the user, the EGNOS system was unable to offer corrections to those satellites in the northeastern sky. Relatively lower availability of GPS satellites coupled with the lower number of EGNOS Ranging and Integrity Monitoring Stations (RIMS) at northeastern latitudes contributed to the poorer than expected positioning performance in the northeastern coverage area of EGNOS.CONCLUSIONS
In this article, we presented a summary of an analysis of EGNOS in Finland for a year-long period, and we explained our automated data collection and data analysis procedure. The following key observations can be made based on the analysis of the year-long data set:
These findings emphasize the fact that there is a great need at northeastern latitudes for an alternative solution to the GEO satellites broadcasting EGNOS corrections. The existing alternative solution is to download the corrections from the Internet through EDAS at the cost of an additional communication link. The other possible alternative could be to broadcast corrections via inclined geosynchronous orbit satellites, or by some other means.ACKNOWLEDGMENTS
This article is based on the paper “Performance of EGNOS in North-East European Latitudes” presented at the 2017 International Technical Meeting of The Institute of Navigation held Jan. 30–Feb. 1, 2017, in Monterey, California. The research was conducted within the FEGNOS project, funded by the Finnish Transport Agency and the Finnish Geospatial Research Institute at the National Land Survey of Finland. More information about the FEGNOS project can be found at www.fegnos.net.MANUFACTURER
The receivers in the FinnRef network are JAVAD GNSS Inc. Delta-G3Ts and the antennas are JAVAD RingAnt_DMs with SCIS radomes.
MOHAMMAD ZAHIDUL H. BHUIYAN received his Ph.D. degree in 2011 from the Department of Electronics and Communications Engineering, Tampere University of Technology, Finland. He is a research manager in the Department of Navigation and Positioning at the Finnish Geospatial Research Institute (FGI) of the National Land Survey of Finland in Kirkkonummi. He is also the acting deputy head of the institute’s Satellite and Radio Navigation Research Group.
HEIDI KUUSNIEMI is the director of FGI’s Department of Navigation and Positioning. She is also an adjunct professor in the Department of Built Environment at Aalto University in Espoo and in the Department of Electronics and Communications Engineering at Tampere University of Technology. She is also the current president of the Nordic Institute of Navigation. She received her M.Sc. and D.Sc.(Tech.) degrees from Tampere University of Technology in 2002 and 2005, respectively.
AURYN SODERINI is an M.Sc. student in the Department of Electronics and Communication Engineering at Tampere University of Technology. He received his B.Sc. in 2012 from the Department of Electronics Engineering at The Third University of Rome.
SALOMON HONKALA is a researcher at FGI. He holds an M.Sc. (Tech.) degree in electrical engineering from Aalto University.
SIMO MARILA is a research scientist in FGI’s Department of Geodesy and Geodynamics. He received an M.Sc. degree in 2011 from Aalto University.FURTHER READING
• Authors’ Conference Paper
“Performance of EGNOS in North-East European Latitudes” by M.Z.H. Bhuiyan, H. Kuusniemi, A. Soderini, S. Honkala and S. Marila in Proceedings of the 2017 International Technical Meeting of The Institute of Navigation, Monterey, California, Jan. 30–Feb. 1, 2017, pp. 627–636.
• Authors’ Related Work
“Performance Comparison of Differential GNSS, EGNOS and SDCM in Different User Scenarios in Finland” by S. Marila, M.Z.H. Bhuiyan, J. Kuokkanen, H. Koivula and H. Kuusniemi in Proceedings of ENC 2016, European Navigation Conference 2016, Helsinki, Finland, May 30–June 2, 2016, doi: 10.1109/EURONAV.2016.7530550.
“Low-Cost Precise Positioning Using a National GNSS Network” by M. Kirkko-Jaakkola, S. Söderholm, S. Honkala, H. Koivula, S. Nyberg and H. Kuusniemi in Proceedings of ION GNSS+ 2015, the 28th International Technical Meeting of the Satellite Division of The Institute of Navigation, Tampa, Florida, Sept. 14–18, 2015, pp. 2570-2577.
“Finnish Permanent GNSS Network: From Dual-frequency GPS to Multi-satellite GNSS” by H. Koivula, J. Kuokkanen, S. Marila, T. Tenhunen, P. Häkli, U. Kallio, S. Nyberg and M. Poutanen, in Proceedings of UPINLBS 2012, the 2nd International Conference and Exhibition on Ubiquitous Positioning, Indoor Navigation and Location-Based Service, Helsinki, Finland, Oct. 3–4, 2012, doi: 10.1109/UPINLBS.2012.6409771.
• European Geostationary Navigation Overlay Service
EGNOS Safety of Life (SoL) Service Definition Document, Version 3.1, European GNSS Agency, Prague, Sept. 26, 2016.
EGNOS Open Service (OS) Service Definition Document, Version 2.2, European GNSS Agency, Prague, Feb. 12, 2015.
“The Future is Now: GPS + GLONASS + SBAS = GNSS” by L. Wanninger in GPS World, Vol. 19, No. 7, July 2008, pp. 42–48.
EGNOS – the European Geostationary Navigation Overlay System – A Cornerstone of Galileo, edited by J. Ventura-Traveset and D. Flament, ESA SP-1303, European Space Agency, Noordwijk, The Netherlands, 2006.
• EGNOS Data Access Service
“EDAS (EGNOS Data Access Service): Differential GNSS Corrections for Land Applications” by J. Vázquez, E. Lacarra, M.A. Sánchez and Pedro Gómez in Proceedings of ION GNSS+ 2016, the 29th International Technical Meeting of the Satellite Division of The Institute of Navigation, Portland, Oregon, Sept. 12–16, 2016, pp. 3550–3561.
EGNOS Data Access Service (EDAS) Service Definition Document, Version 2.1, European GNSS Agency, Prague, Dec. 19, 2014.
EGNOS Data Access Service (EDAS) website.
• Finland’s EGNOS Monitoring and Performance Evaluation
• PEGASUS EGNOS Analyzing Tool
PEGASUS Software User Manual, PEG-SUM-01, Issue M, Eurocontrol, Brussels, Jan. 16, 2004.
• Satellite-Based Augmentation Systems
“Satellite Based Augmentation Systems” by T. Walter, Chapter 12 in Springer Handbook of Global Navigation Satellite Systems, edited by P.J.G. Teunissen and O. Montenbruck, published by Springer International Publishing AG, Cham, Switzerland, 2017.
Minimum Operational Performance Standards for Global Positioning/Satellite-Based Augmentation System Airborne Equipment, RTCA/DO-229E, prepared by SC-159, RTCA Inc., Washington, D.C., Dec. 15, 2016.
As businesses seek to migrate to IP-based telephony solutions, introductions of pure IP and converged systems are on the rise, according to the latest research. Database publisher and analyst group TelecomTactics finds that pure IP systems and converged systems represent a combined 70 percent of new system introductions in 2004 compared to only 35 percent in 2000. Traditional telephone systems that can be IP-enabled or those with no support for VoIP are on the decline.
Businesses are moving to take advantage of IP-based solutions, but protection of their current equipment investment remains a priority. The goal is to avoid high costs by retaining and reusing existing line and station cards and telephones on a new IP system. Converged systems that support both packet and circuit switching are a good fit since these systems accommodate connection to analog and digital telephones, as well as newer IP devices. In 2002, the enterprise telephony market experienced a surge in introductions of converged systems by Avaya, Mitel Networks, NEC, Siemens and other manufacturers.
Pure IP platforms utilize IP peer-to-peer switching, connecting stations directly to each other through the IP network, but can incorporate optional gateways or interfaces for traditional analog and digital connections.
IP networking benefits businesses with distributed locations and makes it more cost-effective to include small branch offices in a network. In 2004, a number of manufacturers introduced pure IP platforms, including 3Com, Comdial and Toshiba with small and mid-sized offerings, and Cisco, NEC and Nortel Networks with platforms for larger enterprises (see system profiles).
Businesses benefit from new IP-based employee productivity applications, including instant messaging, presence, IP audio and video conferencing and collaboration. Collaborative applications help to reduce travel and facilitate communication among dispersed workgroups, allowing employees to easily share information from any location on a corporate network. Web-based conferencing lets conferees record presentations and use white-boarding or engage in face-to- face video calls. Presence-based communication improves employee and customer interactions, allowing users to define how they wish to be reached (via desk phone, cell phone, e-mail, instant messaging or other media). New sophisticated, IP-based contact center functionality adds agent/supervisor instant messaging, collaborative Web browsing, e-mail automated response, live Web chat and multimedia queuing/routing to name a few.
Further studies show that support for IP telephones on business telephony platforms continues to rise from only 20 percent in 1999 to more than 80 percent in 2004. Leading manufacturers are rounding out their IP phone portfolios, offering a range of choices from cost-effective, entry-level and mid-range phones to advanced models. By transmitting voice over a companys data network, IP telephones can reduce costs and easily extend office telephone features to a remote location such as a home or branch office. Corporate directory access, call-history logging, conversation record, large pixel-based displays, color touch-screens and even interoperability with a PDA are among the many popular IP telephone features.
Sandra M. Gustavsen is an analyst covering enterprise systems for TelecomTactics, a database publisher and analyst group within Access Intelligence LLC. Visit www.telecomtactics.com or www.telecomweb.com/enterprise.
SMALL BUSINESS SYSTEMS
3Com NBX V3000
3Com Corp’s NBX V3000
3Com Corp’s new NBX V3000 is an IP PBX platform for small offices or small and medium businesses. The modular NBX V3000 targets businesses with two to 40 users, but can expand to support as many as 1,500 stations using the SuperStack 3 NBX expansion chassis. The NBX V3000 unit includes four CO line ports; one analog station port; 15 ‘Group 2’ phone licenses for 3Com 3102 IP phones; a four-port auto attendant; voice mail capability with 400 storage hours; and the NBX NetSet utility for browser-based administration. This pure IP solution for small businesses delivers IP features and functionality at a key system price, according to 3Com.
Like 3Com’s earlier NBX platforms, the NBX V3000 voice-over- LAN solution includes auto attendant, voice mail, call detail recording, TAPI software and browser-based Web administration - a cost savings over typical PBX systems that require external equipment. The initial NBX V3000 system has 128MB memory, supporting up to 250 devices, eight Virtual Tie Lines and 12 auto attendant/voice mail ports. A 512MB memory upgrade (for a system total of 640MB) increases capacity to 1,500 devices, 48 Virtual Tie Lines and 72 auto attendant/voice mail ports. The SuperStack 3 NBX expansion chassis and interface cards enable the system to handle T1/PRI trunking and additional CO lines up to a 720-trunk capacity. The expanded NBX V3000 has the same capacities as the SuperStack 3 NBX, but does not support optional redundant disk mirroring or redundant power.
The 3Com NBX V3000 is compatible with all 3Com interface boards, gateways, 3Com phones and NBX software applications, providing investment protection for NBX customers. www.3com.com
Alcatel’s OmniPCX Office
Alcatel’s OmniPCX Office ‘all-in-one’ converged platform for smaller businesses (six to 236 users) supports both packet and circuit switching and includes Internet access, an e-mail server, network security, LAN and WAN interfaces, and a host of applications, such as voice mail, unified messaging and in-building wireless capabilities - all in a single system, eliminating the need for multiple components. The OmniPCX Office modular architecture expands by adding modules (up to three), interface boards and telephones.
The call server includes a two- to eight-port voice mail capability with 200 storage hours and two-level/10- choice auto attendant, and an embedded e-mail server lets users handle text and voice messages via a PC or telephone (up to 200 e-mail boxes and 200 voice mailboxes are available). The Alcatel Web Communication Assistant also can be used to access e-mails and voice messages using a Web browser. System administration is simplified by a single centralized, user-friendly Webbased management tool that does not require software installation, and up to 50 sites can be networked via the public Internet.
Users have a range of telephone options, including Alcatel Reflexes digital phones, Mobile Reflexes handsets, analog phones, IP e-Reflexes desk sets and IP PIMphony media soft phones. The OmniPCX PIMphony CTI application enables PC-based call management, including call hold, multiline management, dial by name, redial, screen pops from contact database, call log and unified messaging. The addition of an IP phone module creates a full IP PIMphony media softphone.
Alcatel launched OmniPCX Office in the European small business market in 2001 and introduced the platform in North America in fourth quarter 2004 to be sold through service providers as a bundled managed services offering. www.alcatel.com
Comdial CONVERSip MP1000
ComDial Corp.’s CONVERSip MP1000 Media Platform
Comdial Corp.’s CONVERSip MP1000 Media Platform is an affordable IP telephony solution for small or branch offices. The new system combines telephony, computer and Internet technologies and the open-standard SIP. The embedded SIP registrar acts as a presence manager to display presence status of other subscribers in the system (similar to having a busy lamp field on a telephone, but with additional text information).
Browser-based local or remote administration simplifies system management, and the single platform integrates a LAN interface, auto attendant, unified messaging and administration. The CONVERSip MP1000 supports four to 40 users with a limit of eight PSTN trunks for outbound calls; however, the system handles up to 100 simultaneous peer-to-peer calls.
The CONVERSip MP1000 LAN-only solution supports the new CONVERSip EP200 Multimedia Endpoint (softphone) that uses Microsoft Windows XP technology for video, voice and instant messaging, as well as the CONVERSip EP300 Voice SIP desktop phone with 24 programmable buttons. www.comdial.com
MEDIUM BUSINESS SYSTEMS
Avaya IP Office 3.0
Avaya IP Office Version 2.1
Avaya Inc.’s IP Office is an ‘all-in-one’ converged system for single or multisite businesses that need standard PBX features, analog and digital trunking, plus support for IP telephones. IP Office delivers Internet access, remote access, integrated LAN hub, T1/E1/PRI/analog trunking and support for open standards such as QSIG and H.323.
New Release 3.0 software adds additional installation tools (Wizards), SNMP alarms and the Avaya Jump Start – IP Office Installation Toolkit to simplify installation and maintenance for Avaya certified business partners. Avaya also will add new IP Office phones, the 5400 and 5600 series, designed specifically for IP Office, as well as increased extension and trunk capacity on the IP Office 406.
The new software builds upon features introduced in second quarter 2004 (Release 2.1), including IP Office Conferencing Center Web-based software.
A global offer, the current IP Office family includes the IP Office – Small Office Edition (28 users), IP403 Office (100 users), IP406 Office (180 users) and IP412 Office (360 users). Several applications come standard with the IP Office, including Voice Mail Lite, PhoneManager Lite (PC-based call management) and CTI Link Lite. Optional enhanced versions of these applications also are available, as well as optional Compact Contact Center and Compact Business Center applications for basic call center functionality, plus advanced features such as e-mail response, Web chat, Web callback.
IP Office 3.0 was set to be generally available in December 2004 in North America and many countries in Europe, the Asia-Pacific region and Latin America, according to Avaya. www.avaya.com
Mitel Networks 3300 ICP 5.0
Mitel Networks’ 3300 ICP Release 5
Mitel Networks Release 5.0 for its 3300 Integrated Communications Platform (ICP) includes new and improved hardware and additional networking and messaging features, as well as a cost-effective IP phone, new dual-mode IP phones and IP DECT phones. The 3300 ICP is an enterprise IP PBX that operates across a LAN/WAN infrastructure to provide more than 500 calling features and a range of embedded applications including voice mail, auto attendant, ACD and an 802.11b wireless gateway.
A new five-slot 3300 MX Controller for branch offices with up to 200 users features an integrated analog board that eliminates the need for separate Analog Service Units. An eight-slot 3300 LX Controller for up to 700 users ships with a 450MHz processor and can be configured flexibly with optional expansion modules. Up to 250 controllers can be networked to support more than 40,000 IP ports.
In addition to built-in voice mail software, release 5.0 adds standard unified messaging features for forwarding voice mail and recorded calls (option) to e-mail, and users can pick up voice mail from the e-mail inbox.
Release 5.0 also adds an embedded recorded announcement capability that plays recorded greetings through a voice mail port and eliminates the need for external tape machines or other devices. New networked voice mail provides voice mail service to a network of 3,300 ICP nodes or between a 3300 ICP and a VPIM2-compliant voice mail server. Networked resilient hot desking lets users log into any IP phone in any networked location; personal profile information is mapped onto the phone. www.mitel.com
Toshiba Strata CIX
Toshiba Strata CIX
Toshiba America Information Systems Inc. Digital Solutions Division (TAIS DSD) announced in fall 2004 the new Strata CIX native IP business communications system. Designed for businesses of varying sizes, the 672-port CIX can be deployed in small or medium enterprises or larger businesses with multiple sites. Strata CIX is a pure IP platform that can be TDM-enabled to integrate with station and trunk interfaces from earlier Strata CTX and Strata DK digital systems. Customers with earlier Toshiba systems can migrate nearly 90 percent of their original equipment. In addition to delivering traditional Toshiba telephone features, Strata CIX also enables new features, including ‘My Phone Manager,’ a personal administration tool that lets users program speed dial and feature buttons using a PC Web browser and eManager for programming both Strata CIX and Stratagy ES Voice Processing systems.
FeatureFlex, an optional application for Strata CIX, lets users customize features to meet company, department or individual user needs. System resources and a built-in scripting language are available for creating new applications that do not affect the system’s compiled code. Enterprises no longer have to wait for the manufacturer to make system enhancements, but can enable their own customized solutions in minutes such as integrating back-office systems, connecting to online sources or setting up special call handling.
Users will enjoy the same telephony features whether they are using Toshiba analog, digital or IP-wired or wireless devices. New IP devices for Strata CIX and CTX systems include IPT2010-DS and IPT2020-DS desktop IP phones (introduced in September 2004) with a modern design, two-line displays and full duplex speaker phone functionality. A new Strata Wireless IP Telephone (WIPT2000) works over a wireless LAN, providing IPT2010 desk IP phone features to a mobile device with a large display, four soft keys, seven fixed buttons, 10 programmable buttons, caller ID log and more.
The new SoftIPT SoftPhone operates on PDAs running PocketPC 2003, laptops, tablet PCs and PCs running Windows 2000 or XP. For mobile employees, these new telephone options offer access to all Toshiba telephone features from any location. www.toshiba.com
LARGE BUSINESS SYSTEMS
NEC Unified Solutions UNIVERGE SV7000 Telephony Server
NEC’s UNIVERGE SV7000
NEC Unified Solution’s new SIP-enabled client server, or UNIVERGE SV7000 Telephony Server, integrates VoIP, data and video into a single network and enables more than 750 voice features based on NEC’s NEAX 2400 IPX feature set. As a pure IP system, SV7000 supports IP-enabled connections and IP peer-to-peer switching, connecting stations directly to each other through the IP network. Voice signals travel through the IP network, but do not utilize the switch as in traditional telephony.
UNIVERGE SV7000 is comprised of the SV7000 T server for features and functions associated with traditional telephony components and the SV7000 S as the signaling server between the SV7000 system and SIP or pure IP devices.With the latest version of software, the system supports 4,000 IP ports, 4,000 time slots and 4,000 IP clients. An additional 1,536 TDM ports can be added via optional Port Interface Racks (PIRs). PIRs support traditional analog and digital connections but also can support various trunking, wireless LAN and other TDM connections.
The SV7000 base package includes the SIP-enabled server, ISDN Media Gateway for local and long-distance, 25 NEC Dterm IP phone client licenses, five soft-phone terminal licenses, a 2-port expandable Unified Messaging System with 25 unified messaging client licenses (expandable to 16 ports and 32 ports in the future), a conferencing server with digital announcement and Music On Hold, 25 desktop productivity licenses and NEC’s MA4000 Management bundle (for 25 extensions). www.necunifiedsolutions.com
Nortel Networks Communication Server 1000 Release 4.0
Nortel Networks’ Communications Server 1000E
Nortel Networks Communication Server 1000 (formerly Succession 1000) Release 4.0 is a full-featured IP PBX with a broad range of business applications and more than 650 telephony features. CS 1000 uses packet switching for both voice and data traffic over a LAN or WAN, and adds connection to TDM-based networks such as the PSTN via analog and digital trunks. Each of the three CS 1000 scalable models includes the CS 1000 call server, a signaling server and enterprise media gateways.
CS 1000E, a new offering, targets large customers that desire a full IP PBX solution and need full call processor redundancy. The 19-inch rack-mount system is optimized for IP telephones (up to 15,000), but also supports digital and analog phones (up to 3,000). In addition to Geographic Redundancy and Load Sharing configurations, CS 1000E also supports Campus Redundancy with call server deployment throughout a campus using a high speed data link between servers up to 25 miles apart.
Release 4.0 adds new solutions that enable a geographically dispersed workforce to collaborate in real time. CS 1000 supports SIP-based integration to Nortel Networks Multimedia Communication Server (MCS) 5100 for multimedia and collaborative applications such as video conferencing and calling, picture caller ID, white boarding, file exchange, co-Web browsing, call screening, call logs, presence and instant messaging.
Release 4.0 also improves Nortel’s current line of IP telephones (IP Phone 2002 and 2004 Phase II) and introduces the Mobile Voice Client 2050, a Pocket PC-based client that operates on a PDA. Also new is the IP Phone 2006 with 4.5-inch diagonal display (grayscale), three-port switch, full duplex speakerphone and LAN power options and the new IP Phone 2007 with 5.7-inch color display. IP Phones 2006 and 2007 and an IP Audio Conference Phone will become generally available in the first quarter of 2005. www.nortelnetworks.com
Tadiran Telecom’s Coral IPx
Tadiran Telecom’s Coral IPx 4000
Tadiran Telecom’s Coral IPx systems meet the needs of small, medium or large businesses and can be used as a traditional switch, a VoIP telephony server or both. Four models include the space-saving Coral IPx 500, the mid-sized IPx 800, the fully scalable IPx 3000 and the IPx 4000 for large enterprises with critical, high-traffic operations.
The Coral IPx 4000 meets the needs of mid- to large-sized businesses with high-traffic/high-performance requirements using a 64-bit processor for higher traffic situations (250,000 BHCA). This non-blocking system has a hot-standby dual-control option, including two complete sets of control hardware, each able to fully and independently control the operations of the entire system. Modular 19-inch expansion shelves are used to house VoIP gateways or traditional TDM interface cards. A fully configured IPx 4000 supports up to 4,224 wired ports.
All Coral IPx models can take advantage of the universal gateway and the media gateway card for trunk- and station-side IP telephony, and remote users will enjoy full Coral functionality using the Coral FlexSet-IP telephone. ACD is a standard feature for distributing incoming calls among 250 active agents in multiple groups. For voice mail and unified messaging, Coral IPx supports the unified Coral Message Center with four to 64 ports for voice, e-mail and fax messaging, or customers can choose the four- to 24-port uCMC (unified Coral Message Center) card that also handles all message types. QSIG networking over IP, frame relay or ISDN among Coral systems is a standard feature.
Sprint resells all versions of the Coral IPx as the Sprint IPx Converged PBX available from Sprint Authorized Dealers.www.tadiranamerica.com
Need up-to-date information on available enterprise telephony systems and their features and pricing? Want to compare other vendors against yours? Check out TelecomTactics at www.telecomtactics.com. It offers an interactive Web-based sales tool featuring detailed feature/function-based comparisons of enterprise communications equipment and applications in a side-by-side report format. Product categories covered include IP PBX, PBX, key systems, IP telephony gateways and telephones, voice and unified messaging, contact centers and ACD, computer telephony integration, in-building wireless and hospitality systems.
Call +1 800 678 4642 for an introductory subscription offer.
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