Issue 1 December 1997 xi
Contents
3 Shelf Descriptions and Configurations
â– Overview 3-1
â– DDM-2000 OC-12 Multiplexer Shelf 3-1
â– DDM-2000 OC-12 Multiplexer Shelf Configurations 3-7
OC-12 STS-1 Path Switched Ring Shelf 3-9
OC-12 STS-1/VT1.5 Path Switched Ring
Configuration 3-10
OC-3/IS-3 Dual Ring Interworking (DRI)
Configuration 3-11
OC-12 Ring Configuration (DS1/EC-1 Low-Speed
Interfaces) 3-12
OC-12 Optical Extension Shelf 3-13
Linear (1+1) Extension From OC-12 Ring
Configuration 3-14
OC-12 Dual Homing Shelf 3-15
OC-12 STS-3c Broadcast Shelf 3-16
OC-12 OC-3c Transport Shelf 3-17
â– DDM-2000 Fan Shelf 3-18
4 Power
â– Overview 4-1
â– Introduction 4-1
â– Power Description 4-2
Circuit Packs 4-3
OLIU Circuit Packs 4-3
TSI, TGS/TG3, 3DS3, and 3STS1E Circuit
Packs 4-3
Control Circuit Packs 4-3
LEDs 4-4
Power Minor Alarm 4-4
Power Distribution 4-5