Alcatel 1850 TSS-320 Technical Handbook page 74

The received/transmitted line signal is optical STM-N with N=1, 4, 16, 64, 256 (ITU-T G.957 Rec. and ITU-
T G.691 Rec. ).
The SDH frame format is compliant with ITU-T G.707 Rec.
a) SDH Physical Layer
• Optical Section Layer Trail Termination: OSn_TT
OSn_TT_Sk
input LOS detection
TSF insertion on LOS detection
OSn_TT_So
signal conditioning for transmission medium
• Optical Section Layer Adaptation to Regenerator Section Layer: OSn/RSn_A
OSn/RSn_A_Sk
descrambler
OOF count and LOF detection
SSF insertion (on LOF detection)
OSn/RSn_A_So
scrambler
b) Regenerator Section Layer
• Regenerator Section Layer Trail Termination: RSn_TT
RS_TT_Sk
A1, A2:
J0:
B1:
D1-D3:
SSF detection
TSF insertion (on SSF or TIM detection)
RS_TT_So
A1, A2:
J0:
B1:
D1-D3:
• Regenerator Section Layer Adaptation to Multiplex Section Layer: RSn/MSn_A
RSn/MSn_A_Sk
TSF detection
SSF insertion (on TSF detection)
RSn/MSn_A_So
no information is inserted
Alcatel 1850 TSS-320 Rel. 1.1
72/270 8DG 07734 AAAA Edition 01
frame alignment detection
regenerator section trace recovery and mismatch detection
BIP-8 Errored Block count: even bit parity is computed and compared with B1
recovered from the current frame
RS data communication (DCCR) extraction
frame alignment insertion
regenerator section trace insertion
BIP-8 calculation and insertion
RS data communication (DCCR) insertion
Technical Handbook Common
Functional Description