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SONET_Usr.bk Page 20 Wednesday, December 13, 2000 11:11 AM
Setting the Interfaces - SDH Operation
Setting Transmit Interface
Setting Transmit Interface
Payload Selection
One of the key features of the OmniBER 720 is the ability to test concatenated
payloads. The following gives a brief description of concatenated payloads, and the
benefits of using them.
Concatenated Payloads
Bulk filled or contiguous payload structures e.g. (STM-4c) are designed for carrying
broadband services. The entire payload area is used to carry the service with no
structured mapping or channelization.
In the case of a concatenated STM-4 (denoted STM-4c), the virtual container area is
entirely filled by a single VC-4-4c. This VC-4-4c consists of one Path Overhead and a
single container capable of carrying a tributary signal at rates up to approximately 600
Mb/s. Once assembled a VC-4-4c is multiplexed, switched and transported through the
network as a single entity.
Benefits: Test the entire bandwidth in one go, and reduce test times. The following
table illustrates the reduced test times using concatenated payloads.
Table 1
20
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Test times using concatenated payloads
Test Time (based on 100
Performance
STM-4c
test limit
Container
12 days
14
10-
13
1.2 days
10-
12
2.90 hours
10-
11
0.3 hour
10-
10
1.75 minutes
10-
errors)
STM-1 Bulk
Payload
48 days
4.8 days
11.6 hours
1.2 hour
7 minutes
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