Healthy VoIP Nets�Part LIII�Network Management Architectures: Anritsu
Anritsu Company is the American subsidiary of Anritsu Corporation (Atsugi, Japan), a global provider of innovative communications test and measurement solutions for more than 110 years.
Anritsu provides solutions for existing and next-generation wired and wireless communication systems to customers that include large enterprises, service providers, cable companies, device and system manufacturers, universities, and contract manufacturers. Anritsu products include wireless, optical, microwave/RF, and digital instruments as well as operations support systems for research and development, manufacturing, installation, and maintenance.
Anritsu also provides precision microwave/RF components, optical devices, and high-speed electrical devices for communication products and systems.
Anritsu sells in over 90 countries ad has approximately 3,500 employees in offices throughout the world. The U.S. headquarters is in Morgan Hill, California, with additional offices in Richardson, Texas, and Pine Brook, New Jersey.
Anritsu has developed two systems in support of VoIP networks.
The CMA 3000 is Anritsus next-generation portable, compact field test system, designed as an all-in-one analyzer for field technicians who install and maintain mobile-access and fixed-access networks.
The CMA 3000 addresses a wide range of applications, including installation, provisioning, propagation line analysis, performance analysis, and physical line monitoringincluding in-depth and all-layer analysis of transmission problems.
Fault location is greatly facilitated by the CMA 3000's high degree of portability. Note that the instrument is powered by rechargeable and replaceable, intelligent, high-capacity LiIon batteries, providing more than 10 hours of operation between recharges for the instrument in its basic configuration. The CMA 3000 can also be powered via an external adapter for long-term operation.
In its basic configuration, the CMA 3000 is a full-featured 2 Mbps line transmission quality tester and analyzer. With the addition of options, the unit can test a large number of interfaces and technologies, including SDH, ATM, E3, Ethernet, Frame Relay, and the Abis interface of GSM and GPRS networks.
Other options turn the system into a very powerful signaling analyzer for GSM, GPRS/EDGE, SS7, and ISDN protocols.
The basic CMA 3000, with its two 2 Mbps receivers and transmitters, supports framed and unframed testing and monitoring of 2 Mbps systems, with the dual inputs facilitating instant monitoring of both sides of a line. The system also supports a number of the tests that are defined in RFC 2544 Benchmarking Methodology for Network Interconnect Devices, which was developed by the Internet Engineering Task Force (IETF) to define a number of standard tests that could be used to describe the performance characteristics of network elements, such as throughput, frame loss, and packet jitter.
For VoIP testing, the instrument can establish a call and answer incoming calls. The CMA 3000 allows VoIP calls to be made on 100 and 1000 Mbps optical interfaces, as well as on 10, 100, and 1000 Mbps electrical interfaces.
By connecting an analog telephone to the CMA 3000 a user can make a conversation with the called/calling party (see Figure 1).
Statistics collected during the call will inform the user on the performance of the communication line used for the call, and present voice quality information in terms of the Mean Opinion Score (MOS) and R-factor values (see Figure 2).
To make a realistic test case, the instrument can generate or receive up to eight calls simultaneously (see Figure 3). These eight calls can also be assigned to a stream, allowing individual configuration of priority for the calls. Anritsu claims that the CMA 3000 is the only product that can combine multi-stream and VoIP capability.
The second system from Anritsu supporting VoIP is named MasterClaw, which is a probe-based, non-intrusive monitoring system designed to provide full end-to-end monitoring of converged networks, while also integrating troubleshooting, service quality, and customer quality monitoring.
The integrated service assurance environment lets network operators and service providers monitor their network as a unified service platform, as opposed to treating each service and network segment as a separate entity.
VoIP service providers benefit from the MasterClaws ability to conduct integrated monitoring that can be extended to the legacy SS7 network domain all the way to major enterprise customers, or even residential users. The non-intrusive probes support the legacy SS7 network protocols, plus all commonly used protocols for VoIP services, including: SIP/SIP-T, MGCP, H.323, MEGACO, RTCP/RTP and SIGTRAN. This allows the tracing of calls across both SS7 and VoIP domains.
Further details on the Anritsu architecture and products can be found at http://www.us.anritsu.com. Our next tutorial will continue our examination of vendors network management architectures.
Copyright Acknowledgement: © 2008 DigiNet Corporation ®, All Rights Reserved
Mark A. Miller, P.E., is President of DigiNet Corporation®, a Denver-based consulting engineering firm. He is the author of many books on networking technologies, including Voice over IP Technologies, and Internet Technologies Handbook, both published by John Wiley & Sons.