Higher rate STM-N frames are built through byte-multiplexing of N STM-1 signals.
A STM-N signal can only be multiplexed out of N STM-1 frames with their first A1 byte at the same position (i.e. the first A1 byte arriving at the same time).
STM-N frames are built through byte-multiplexing of N STM-1 signals. Not all bytes of the multiplexed SOH (size = N x SOH of STM-1) are relevant in an STM-4/16.
For example there is only one B1 byte in an STM-4/16 frame which is computed the same way as for an STM-1. Generally the SOH of the first STM-1 inside the STM-N is used for SOH bytes that are needed only once. The valid bytes are given in ITU-T G.707.
|
Designation |
Line rate (Mbit/s) |
Capacity |
|---|---|---|
|
STM-1 |
155.520 |
1 AU-4 or 3 AU-3 |
|
STM-4 |
622.080 |
4 AU-4 or 12 AU-3 |
|
STM-16 |
2488.320 |
16 AU-4 or 48 AU-3 |
|
STM-64 |
9953.280 |
64 AU-4 or 192 AU-3 |
|
STM-256 |
39813.120 |
256 AU-4 or 768 AU-3 |
Alcatel-Lucent – Proprietary
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