Ready for VoIP: Network Management Architectures: JDSU

JDSU, headquartered in Milpitas, California, is a provider of communications test and
measurement solutions and optical products for telecommunications service providers,
cable operators, and network equipment manufacturers.

JDSU’s Communications Test and Measurement business provides the instruments, systems,
software, and services that enable IP/broadband communications from the headend to the
home, with an established presence worldwide supporting deployments of VoIP, IPTV, and a
variety of triple- and quad-play service offerings, big and small, ensuring reliability,
efficiency and lowering operational costs.

JDSU’s Communication Test and Measurement business is built on its acquisition of
Acterna, which led several communications test markets in consecutive years and was home
of the industry-standard T-BERD optical network test system. Acterna, in turn, was formed
when Telecommunication Techniques Corporation (TTC)-then the world’s third largest
communications test and measurement company-merged with Wavetek Wandel Golterman, then
the world’s second largest test and measurement company.

JDSU has approximately 7,000 employees operating in 164 countries, earning $1.4
billion in revenue during their fiscal year 2007.

JDSU has continued to market the Acterna line of stand-alone protocol analyzers, which
are named the DA-3400 and DA-360A products.

The DA-3400 system supports a number of network topologies, including 10/100/1000
Ethernet, WAN, ATM, Mobile, and VoIP, with the capacity for multiple interfaces within
the unit. The DA-3600A system supports speeds from 56 Kbps to 2.4 Gbps, including WAN
analysis up to the DS-3 rate, and real-time VoIP and VoATM call quality analysis.

The systems have the ability to decode over 450 different protocols and to identity
over 1,000 more. VoIP protocols supported include RTP,
and SIGTRAN. Both units have available a specific VoIP Analysis Option, which enables the
DA-3400 to perform real-time analysis of 8,000 simultaneous calls, the DA-3600A 64,000
simultaneous calls. These large capacities are the result of custom hardware
implementations that ensure that all call statistics and quality measurements are
accurate, regardless of the network utilization or the presence of non-VoIP traffic.

The systems include the abilities to provide standard Mean Opinion Score (MOS) and R-factor calculations for both directions of every
call, with sorting, filtering, and display customization that can focus on specific areas
of concern.

Each call is also monitored for packet transport quality. The systems generate ‘expert
events’ when defined thresholds are exceeded and sends Simple Network Management Protocol
(SNMP) and e-mail alerts to the administrators when the call quality falls below
pre-configured thresholds.

The complex call signaling messages can be illustrated graphically-including the
timing and response codes during call setup and call disconnect procedures-with a
multi-station display that can illustrate all the connections for a conference bridge.
Another interesting feature is the extensive display filtering of the VoIP calls, which
allow a subset of the calls to be analyzed. For example, if poor quality calls occur on
only one specific subnet, those calls can be viewed based upon a specific phone number,
or unique VLAN or MPLS label.

A second product line, the PVA-1000 Analysis Software, is a system that runs on
Windows 2000, XP, and Vista PCs to support VoIP network implementations. The PVA-1000
performs full analysis of VoIP calls with jitter, packet loss, and audio playback test
capabilities for enterprises, call centers, and carriers delivering service in VoIP, IMS,
and fixed-mobile converged environments. It is compatible with a variety of network
service and infrastructure types, including softphones, wireless IMS networks, wireline
networks, VPN, and enterprise.

The software can identify individual calls and evaluate their quality (Figure
), and provides jitter (Figure 2) and packet loss (Figure
) graphs that show the distribution of impairments throughout the call. It can also
display call signaling trace diagrams to illustrate the details of the message exchange
timing and result codes (Figure 4).

Among its strongest features, the PVA-1000’s new Capture Agent lets the system monitor
multiple calls and generate individual packet capture files for each call that falls
below a predetermined MOS threshold, automatically transferring the resulting capture
file to a pre-selected server. These Capture Agents can be placed on Ethernet Switch SPAN
ports, PCs with softphones, or desktop PCs connected to IP phones, making them ideal for
network turn-up, acceptance, and troubleshooting applications.

In addition, the PVA-1000 can perform signaling trace, audio playback, and full
decodes of signaling and media packets, improving the ability of operators to quickly and
proactively troubleshoot common errors in VoIP performance such as delay and echo.

Further details on the JDSU architecture and products can be found at Our next tutorial
will continue our examination of vendors’ network management architectures.

Latest Articles

Follow Us On Social Media

Explore More