Overhead bytes
Function
Processing
F1
64 kbit/s user channel
Fixed to 11111111
K1, K2 (bit 1 to 5)
Automatic Protection Switching
(APS) channel for MSP
Yes
K2 (bit 6 to 8)
Remote alarm MS (MS-FERF)
Yes
S1
Synchronization state
Yes
M1
Remote error indication MS
(MS-REI)
Yes
Z1, Z2
Reserved
Fixed to 11111111
NU
National use
11111111
The next table describes the Path Overhead (POH) processing functions for VC-12
transmission.
Overhead bytes
Function
Processing
V5 (bit 1 to 2)
VC-12 BIP-2 error checking
Yes
V5 (bit 3)
REI path (FEBE)
Yes
V5 (bit 4)
RFI path
Fixed to 0
V5 (bit 5 to 7)
Label of VC-12 path
Yes
V5 (bit 8)
RDI path (FERF)
Yes
J2
VC-12 Trace identifier
Yes
Z6
Connection/monitoring
Fixed to 0
K4 (bit 1 to 4)
VC-12 APS path
Fixed to 0
K4 (bit 5 to 6)
Reserved
Fixed to 0
The next table describes the POH processing functions for VC-3 tranmission.
Overhead bytes
Function
Processing
J1
VC3 trace identifier
Yes
B3
Path bit error monitoring
(BIP-8)
Yes (Planned for Release 4.0,
August 2006)
C2
Path signal label
Yes
G1
REI/RDI path
Yes
F2
User channel
Fixed to 0
F3
User channel
Fixed to 0
Product description
System specifications
....................................................................................................................................................................................................................................
365-312-847R4.0
Issue 4, November 2006
Lucent Technologies - Proprietary
See notice on first page
2-43