User's Manual

2 - OPERATION
Installation and User Guide - N56717020101
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SAGEM SA
Page A2-1
2. OPERATION
2.1 - Functional description
The ADR 155C is an optical STM1 add-drop multiplexer used to build STM-1 point-to-point links,
STM-1 rings, or mesh networks, so achieving the mismatch of links at 2 Mbit/s, Ethernet or
STM1.
The ADR 155C can also be connected to an equipment of the synchronous digital hierarchy in
accordance with UIT-T recommendations G.707 and G.783.
The ADR 155C modelling in functional blocks according to standard G.783 is presented below:
SPI : SDH Physical Interface
RST : Regeneration Section Termination OHA : OverHead Access
MST: Multiplex Section Termination
MSP : Multiplex Section Protection
MSA : Multiplex Section Adaptation
SETS : Synchronous Equipment
Timing Source
HPOM : Higher order Path Overhead Monitor
HPC : Higher order Path Connection
SETPI : Synchronous Equipment
Timing Physical Interface
HPT : Higher order Path Termination
HPA : Higher order Path Adaptation
LUG : Lower order path Unequipped Generator
SEMF : Synchronous Equipment
Management Function
LPOM : Lower order Path Overhead Monitor MCF : Message
Communication Function
LPC : Lower order Path Connection
LPT : Lower order Path Termination
LPA Lower order Path
Adaptation (VC12)
Lower order Path
Adaptation (VC3)
PPI : plesiochronous physical
Interface (VC12)
plesiochronous physical
Interface (VC3)