Figure 94. Vc-3 Structure; Figure 95. Tu-3 Structure - Alcatel 1850 TSS-320 Technical Handbook

9 rows
POH STRUCTURE:
• J1 (path trace) utilized to transmit in a cyclic mode a 64-octet configuration in order to check
the connection continuity.
• B3 resulting from the BIP-8 performed on the previous VC-3, before the scrambler. PM and ex-
BER supported at VC3 terminations.
• C2 (signal label) = the configurations are utilized to indicate if VC-3 is equipped or not, or the
payload structure. SLM and UNEQ supported at VC3 - TTP.
• G1 (path status) utilized to transmit information on the link status to the remote terminal. PM
near end / far end supported at LVC terminations. It contains:
– four bits for the REI (Remote Error Indication) (ex FEBE=Far End Block Error) indication,
where the decimal numbers 0-8 indicate the number of violations of BIP-8 (the illegal
values 9 to 15 indicate absence of errors);
– one bit for the RDI (Remote Defect Indication), (ex FERF= Far End Receiving Failure) and
other three digits not utilized.
• F2, F3: bytes utilized for the transportation of two user data channels via the AUX connections.
• H4: position indicator of inner lower order payloads, as a multiframe indicator.
• K3: for APS signalling (Automatic Protection Switching).
• N1: Network Operator byte, for Tandem Connection Monitoring (TCM).
9 rows
• H1,H2,H3: TU-3 Pointer
Alcatel 1850 TSS-320 Rel. 1.1
148/270 8DG 07734 AAAA Edition 01
85 bytes
J1
B3
C2
G1
F2
C-3
H4
F3
K3
N1
POH OF VC-3

Figure 94. VC-3 structure

86 bytes
H1
H2
H3
VC-3
S
T
PAYLOAD
U
F
F
I
N
G

Figure 95. TU-3 structure

VC-3
Technical Handbook Common
Functional Description