Figure 96. Vc-4 Structure And Poh Byte Contents - Alcatel 1850 TSS-320 Technical Handbook

9 rows
POH of VC-4
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-4, before the scrambler.
C2 (signal label) the configurations are utilized to indicate if VC-4 is equipped or not or the
payload structure.
G1 (path status) utilized to transmit information on the link status to the remote terminal.
– four bits contain the FEBE Tx (Far End Block Error) signal, 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 to carry the FERF Tx alarm signal and three unused bits.
F2 (path user channel) utilized to transmit and cross connect a data channel received from the
SERVICE unit.
H4 (position indicator) multiframe indicator (utilized for the payloads structured through TUG)
which indicates the subframe of each multiframe.
F3 (path user channel) utilized to transmit and cross connect a data channel received from the
SERVICE.
K3 Higher Order Protection (HOP), not operative in current release.
N1 network operator byte (for Tandem Connection Protocol)
Technical Handbook Common
Functional Description
261 bytes
J1
B3
C2
G1
F2
VC4 PAYLOAD
H4
F3
K3
N1

Figure 96. VC-4 Structure and POH byte contents

C-4
or
Alcatel 1850 TSS-320 Rel. 1.1
8DG 07734 AAAA Edition 01
VC-4
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