PairGain PG-Flex, Manual

Page: 11 / 168

Central Office Terminal Equipment
3
Central Office Terminal Equipment
The COT comprises the following equipment:
• COT Shelf
• Alarm Unit or FPI Interface
• Line Unit(s)
• Channel Unit(s)
COT Shelves
COT shelves provide standard mounting configurations for PG-Flex systems and support both
19-inch and 23-inch equipment frames. The 19-inch shelf may be equipped with a maximum of
two systems and the 23-inch shelf may be equipped with a maximum of four systems. Line,
channel, and alarm units are installed from the front of the shelf; interconnections are located on the
passive backplane at the rear of the shelf. A Plexiglass™ cover is installed on the rear of the shelf
to prevent damage to wire-wrap terminations and to protect the technician from high voltages.
Figure 2. Two 24 Channel PG-Flex Systems (19” Shelf)
The 19-inch COT Shelf (Figure 2), when fully populated, accommodates two complete systems.
Each system requires one COT line unit and up to three channel units.