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SONET_Usr.bk Page 60 Wednesday, December 13, 2000 11:11 AM
Setting the Interfaces - SONET 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 (STS-3c, STS-12c or STS-48c) are
designed for carrying broadband services. The entire payload area is used to carry
the service with no structured mapping or channelization.
For example, in a concatenated STS-12 (denoted STS-12c), the virtual container
area is entirely filled by a single STS-12c SPE. This STS-12c SPE consists one Path
Overhead and a single container capable of carrying a tributary signal operating at
rates up to approximately 600 Mb/s. Once assembled a STS-12c SPE 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.
Description
The transmit interface settings should match the network equipment settings of rate,
wavelength and mapping, determine the payload to be tested and set background
conditions to prevent alarms while testing.
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Test Time (based on 100 errors)
Performance
STS-48c SPE
test limit
Container
14
48 days
10-
13
4.8 days
10-
12
11.6 hours
10-
11
1.2 hour
10-
10
7 minutes
10-
STS-12c SPE
STS-3c SPE
Payload
Payload
192 days
>2 years
19.2 days
77 days
1.9 days
7.7 days
4.8 hour
18.5 hours
28 minutes
1.9 hours
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