Alcatel 1660SM Technical Handbook page 521

OUTPUT side : from MATRIX to line
MSA (Ms/Sn_A_So) : it performs AUG assembly, AU–4 pointer generation, AU–AIS generation.
The sixteen AU4 structure are byte interleaved in the STM–16 structure with fixed phase relationship
vs. the same multiple signal.
MST (MSn_TT_So) : it performs BIP–24 calculation and insertion, MS–REI MS–RDI and MS–AIS
insertion.
RST (RSn_TT_So) : it performs frame alignment insertion, regenerator section path trace insertion,
BIP–8 calculation and insertion.
SOH BYTE insertion (Tx side): DCC bytes (DCCR D1–D3 and DCCM D4–D12) coming from the
DCC frames are inserted into the SOH section.
K BYTES insertion and extraction (Tx side) : K1, K2 bytes are extracted from the frame coming
from backpanel and re–inserted on the same output line frame .
HOA BLOCK (HPT, HPA)
From HPC matrix to LPC matrix
HPT (Sn_TT_Sk) : path trace information is recovered, REI information is recovered, HP–RDI and
UNEQ are detected, VC4 BIP–8 errored count block. TSF is applied if SSF or UNEQ or TIM or AIS
is detected.
TSD is applied if a condition of signal degrade is detected.
Moreover :
F2 F3 byte extraction (Rx side) : both F2 and F3 bytes are extracted from the received flow and
serialized on a DCC frame .
N1 byte extraction (Rx side) : for the network Tandem Connection Termination & Monitoring
function (TCT/TCM).
HPA (Sn/Sm_A_Sk) : VC–4 disassembly, TU pointer interpretation, LOP and TU–AIS detection,
HP–SLM and LOM detection.
From LPC matrix to HPC matrix
HPA (Sn/Sm_A_So) : VC4 assembly, TU pointer generation, TU–AIS generation , signal label
insertion,
HPT (Sn_TT_So) : path trace identification insertion, RDI and REI indications insertion, VC–4 BIP–8
calculation and insertion.
Moreover:
F2 and F3 byte insertion (Tx side) : F2/F3 bytes are inserted on the DCC frame
N1 byte insertion (Tx side) : for the network Tandem Connection Termination & Monitoring function
(TCT/TCM).
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