Atec Acterna-JDSU-ANT-20SE - Manual (Page 22)

ATM QoS test with four different SVCs
The ANT-20SE with BAG can perform SVC and PVC tests on up to
four circuits simultaneously. Multi-channel services, such as those used
for multimedia applications, can thus be simulated.
Any channel type can be selected from the database or newly defined
for each channel.
Real-time measurements conform to the ITU-T O.191 standard which
defines the test cell format and the test algorithm. Important source
parameters can be regulated on-line during the test.
The results are clearly displayed, with graphics elements used to
indicate defects or highlight status information.
Signalling analysis
Sequence errors in the signalling protocol adversely affect correct
management of ATM services. They can be detected by recording and
displaying all channel states and changes of state in chronological order
with timestamp information. The ANT-20SE constantly monitors the
states of the SVCs being tested. The protocol can thus be checked for
correctness and any errors detected rapidly. The connection set up time
is measured for all test channels.
Traffic management and contract optimization
Traffic shaping (single/dual leaky bucket) can be switched on for each
ATM channel, even on-line during the measurement.
In addition, the following are displayed per channel with soft LEDs:
± Non Conforming Cells (NCC)
± Dropped Cells (DC)
Using this information it is possible to check whether the UPC (Usage
Parameter Control) functions of the network are working and are
implemented in compliance with the standard.
At the same time, the degree of utilization of the traffic contracts can
be determined.
Using the facilities for simulating all relevant source parameters with
up to four competing channels, it is possible to optimize the contract
parameters in the network.
Professional record of results
The ANT-20SE generates a professional record of instrument settings
and test results that is output from a standard printer.
The record can be used for various purposes, e.g.:
± Guarantee documentation
± Acceptance documentation
± Installation record
± Evidence of adherence to contract, etc.
In other words, the ANT-20SE handles the entire process from
measurement through to producing a permanent record of the results.
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Figure 20: Soft-LED indication of multiplex results.
Figure 19: ATM test results for a real-time measurement
on channel A.
Broadband Analyzer/Generator
The module includes software test functions for
± ATM Test Controller
± ATM Test Results
± ATM Channel Explorer
± STS-3c/STM-1 with C4/SPE ATM mapping to
ANSI T1.105/107 and ITU-T G.707, I.432
ATM test controller
Instrument port configurations
Emulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SVCs, PVCs
Looped signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PVCs
Test cell channels
Four test channels
settable from . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 149.760 Mbit/s
Header setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . via editor
Load setting in . . . . . . . . . . . . . . . . . . . . . . . . . . . . kbit/s, Mbit/s, cells/s
Test cell format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . to ITU-T O.191
ATM service categories
Switched circuits and permanent circuits for:
Constant bit rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CBR
Real-time variable bit rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . rt-VBR
Non real-time variable bit rate . . . . . . . . . . . . . . . . . . . . . . . . . nrt-VBR
Deterministic bit rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DBR
Statistical bit rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SBR
Unspecified bit rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UBR
Signalling emulation
Terminal emulation at the UNI as per ITU-T and
ATM Forum recommendations
Protocol types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . UNI 3.0
UNI 3.1
Q.2931
Q.2961
Test types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Self-call, 2 SVCs
Calling, 4 SVCs
Called, 4 SVCs