Issue 1 December 1997 7-1
7
Circuit Pack Descriptions 7
Overview 7
This section provides a detailed functional description of the DDM-2000 OC-12
Multiplexer circuit packs.
Introduction 7
The circuit packs in the DDM-2000 OC-12 Multiplexer are divided into three main
categories:
■ Control circuit packs
— BBG8/BBG8B system controller (SYSCTL)
— BCP4 overhead controller (OHCTL)
■ Synchronization circuit pack
— BBF2B timing generator (TGS)
— BBF4 timing generator 3 (TG3)
■ Transmission circuit packs
— BBG11/BBG11B 3DS3 low-speed interface (3DS3)
— BBG12 3STS1E low-speed interface (3STS1E)
— BCP3 STS-1 time slot interchange — flexible (TSI FLEX)
— 21D/21D-U IS-3 optical line interface unit (OLIU)
— 21G/21G-U/21G2-U OC-3 OLIU (long reach 1310 nm)
— 23G/23G-U OC-12 OLIU (long reach 1310 nm)
— 23H/23H-U OC-12 OLIU (long reach 1550 nm).
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