Alcatel 1850 TSS-320 Technical Handbook page 77

B3:
• VC-4 Tandem Connection Adaptation: Sn/SnD_A
For Sonet tributaries the function is not applied.
For SDH VC-4 tributaries, the follow applies, according to G.707:
Sn/SnD_A_Sk
this function will restore the invalid Frame Start condition if that existed at the ingress
of the tandem connection.
AIS insertion.
Sn/SnD_A_So
this function will replace the incoming Frame Start signal by a local generated one
if all-ONEs VC is received.
• VC-4 Tandem Connection non-intrusive monitoring: SnDm_TT
For Sonet tributaries the function is not applied. For SDH VC-4 tributaries, the follow applies,
according to G.707 Annex D (Annex C option is not supported):
SnDm_TT_Sk
N1[1-4]:VC-4 BIP-8 extraction and EDC calculation.
N1[8][73]:RDI extraction.
N1[5]:
N1[7][74]:ODI extraction (Outgoing Defect Indication).
N1[6]:
N1[7-8]: extraction from the multiframed channel N1[7-8] of:
• Path Sub-layer protection function
–
Path Layer Adaptation to the Path Protection Sub-layer: Sn/SnP_A
Sn/SnP_A_Sk
Sn/SnP_A_So
–
Path Protection Sub-layer Termination: SnP_TT
SnP_TT_Sk
SnP_TT_So
Technical Handbook Common
Functional Description
BIP-8 compensation.
REI extraction.
OEI extraction (Outgoing Error Indication).
FAS (Frame Alignment Signal) in frames 1 to 8.
trace identifier in frames 9 to 72.
TC RDI and ODI in frames 73 to 76.
SSF insertion (on TSF detection)
SSD insertion (on TSD detection)
F2, F3: path user channel insertion
F2, F3: path user channel extraction
SSF detection
TSF insertion (on SSF detection)
no information is inserted
Alcatel 1850 TSS-320 Rel. 1.1
8DG 07734 AAAA Edition 01 75/270