ZyXEL Communications Multi-service Access Platform MSAP2000 - Manual (Page 14)

1. System Introduction
MSAP2000 Technical Manual V3.0 1-3
The following modules come with 1:1 redundancy functions:
„ Power Supply Module: CoPSM, RtPSM
„ Main Processing Module (MPM)
„ Expansion Link Module (ELM)
„ Expansion Processing Module (EPM)
„ STM-1 Trunk Module (OIM, SM1)
„ STM-4 Trunk Module (SM4)
„ V5.1/V5.2 Processing Module (V5P)
The following modules come with N+1/N:1 redundancy functions:
„ E1 Trunk
„ Packet Voice module (PVM)
The OIM (SDH STM-1)/SM1/SM4 Optical Interface Modules
provide automatic protection switching (APS) function and 1:1
redundancy protection. The protection time is less than 50ms,
and services will not be interrupted during protection switching.
Local Craft Terminal
(LCT)
The local RS-232 menu-driven management interface allows for
selection of Configuration, Maintenance, Fault Management, and
Security Management functions. In addition, supervisor could
process OAM&P at both COT node and RT nodes. All the
settings will be coordinated automatically and saved in system
database.