TCM Standards
The Tandem paths are defined in ITU recommendation G.707 Annex D and Annex E
G.707 Annex D for VC4 and VC3
G.707 Annex E for VC2 and VC1
G.707 defines a tandem connection source and sink and describes the responses of each when defect (alarm) and
error conditions are detected
Tandem connection maintenance signals are carried in:
N1 byte for VC4 and VC3
N2 byte for VC2 and VC
These two bytes are structured similarly, but their functions are not identical
10.1.9 Tributary Scan
This function requires VC12 or VT-1.5 mapping and allows for a quick check of the signal structure, trace identifier, and the
payload.
An important part of any Add Drop Multiplexer (ADM) installation process is the verification of the path routing. Considering that
an STM-1 contains 63 x VC-12’s and a STM-4 contains 252 x VC-12’s checking each path manually can be very time
consuming.
TX300S_e-manual_D07-00-064P_RevA00
Содержание VePAL TX300M
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