Alcatel 1850 TSS-320 Technical Handbook page 82

a) HO Path Layer
• VC-4 Tandem Connection Trail Termination: SnD_TT
For Sonet tributaries the function is not applied. For SDH VC-4 tributaries, see 3.4.1.1 on page
71 for details.
• High Order Path trail termination Function (HPT): Sn_TT
Sn_TT_Sk
J1:
G1[1-4]: The REI information is recovered.
G1[5-7]: Path Status monitoring detection --> G1[5] is used for HP-RDI detection;
C2:
B3:
TSF insertion (on SSF or UNEQ or TIM or AIS detection).
TSD insertion (on a condition of degraded signal detection).
Sn_TT_So
J1:
G1[1-4]: The REI information insertion on B3 errors detection.
G1[5-7]: Path Status monitoring insertion --> G1[5] is used for HP-RDI;
B3:
• High Order Path adaptation to Lower Order Path layer (HPA): Sn/Sm_A
Sn/Sm_A_Sk
TU pointer interpretation
Multiframe alignment recovery (not significant for VC-3)
HO payload deassembly into LO tributaries
Sn/Sm_A_So
TU pointer generation
PJE events count
Multiframe alignment generation (not significant for VC-3)
HO payload assembly from LO tributaries
b) LO Path Layer
• Lower Order Path non intrusive monitoring Function (LPOM): Smm
For VC-3 LO tributaries (m=3), refer to Snm_TT functions described in section 3.4.1.1 on page
71.
For other LO tributaries:
Smm_TT_Sk
J2:
V5[3]:
V5[8]:
V5[5-7]: Signal Label Monitoring --> UNEQ and VC-AIS detection.
V5[1-2]: VC-m BIP-2 Errored Block Count.
Alcatel 1850 TSS-320 Rel. 1.1
80/270 8DG 07734 AAAA Edition 01
Path Trace information is recovered.
G1[6-7] is optionally used for HP-RDI coding enhancement.
Signal Label Monitoring --> UNEQ and VC-AIS detection.
VC-n BIP-8 Errored Block Count.
Path Trace information insertion.
G1[6-7] is optionally used for RDI enhancement.
VC-n BIP-8 calculation and insertion
Path Trace information is recovered.
The REI information is recovered.
Path Status monitoring detection.
Technical Handbook Common
Functional Description