Issue 3 June 2000
7-1
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Circuit Pack Descriptions
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Overview
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The first part of this chapter provides a detailed functional description of the DDM-
2000 FiberReach Multiplexer circuit packs for the wideband shelf. The second part
of this chapter provides a detailed functional description of the DDM-2000
FiberReach Multiplexer circuit packs for the narrowband shelf.
Wideband Shelf - Introduction
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The circuit packs in the DDM-2000 FiberReach Multiplexer are divided into the
following main categories:
■
Control circuit packs
— BBG8/BBG8B system controller (SYSCTL)
— ECC2 user panel (USPNL)
■
Transmission circuit packs
— BBF1B DS1 low-speed interface (DS1)
— BBF3/BBF3B DS1 performance monitoring (DS1PM)
— BBG4/BBG4B DS3 low-speed interface (DS3)
— BBF6 T1 extension
— BBG19 DS3 data services interface
— BBF8 high bit rate digital subscriber line (HDSL)
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