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Signaling System No. 7 (SS7/C7): Protocol, Architecture, and Services by Jeff Hewett, Lee Dryburgh

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Appendix L. Tektronix Supporting Traffic

Example L-1 shows the Message Transfer Part 2 (MTP2) exchange of Link Status Signal Units (LSSUs) that is used to bring a link into alignment, and prove it before using it for the first time or following recovery. For more information, refer to Chapter 6, “Message Transfer Part 2 (MTP2).”

Example L-1. A Trace File of a Link Alignment (Captured on Tektronix K1297)

 +--------------------+------------------------+------------+------------+ |Long Time |From |2. Prot |2. MSG | +--------------------+------------------------+------------+------------- |11:02:14,125,970 |1:B (Tx):16 |MTP-L2 |LSSU-SIOS | |11:02:14,126,618 |1:A (Rx):16 |MTP-L2 |LSSU-SIOS | |11:02:14,126,981 |1:B (Tx):16 |MTP-L2 |LSSU-SIO | |11:02:14,128,477 ...

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