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SONET_Usr.bk Page 116 Wednesday, December 13, 2000 11:11 AM
Tandem Connection Monitoring
Tandem Connection Monitoring (TCM)
Tandem Connection Monitoring (TCM)
What is a Tandem Connection?
A tandem connection is a bi-directional connection between two TCTEs (Tandem
Connection Terminating Elements) along an SDH path, which is managed as a
separate entity. The tandem path is formed from an SDH Virtual Container (VC)
with special monitoring signals carried in the path overhead (POH) bytes. These
bytes enable monitoring of tandem paths, performance analysis and fault location -
the ability to finger point.
TCM Test Capability in OmniBER
The TCM test functionality in the OmniBER 718 complies with G.707 Annex D and
Annex E. Features included are alarm generation and detection, error generation and
detection and access point indentifier generation and decode.
The functionality covers the requirements for both high order and low order paths.
High Order:
Low Order:
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VC4 →AU4 and VC3→AU3 use N1 byte.
VC3→TU3 use N1 byte.
VC2→TU2, VC11→TU11 and VC→TU12 use N2 byte.
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