1-8
Product Description
Chapter 1 - Introduction
CO Interface Boards
The types of CO Interface boards are listed in the table and narrative that follow.
Direct Inward Dial Board
The Direct Inward Dial Board (DIDB) provides four analog DID CO interface ports. The DIDB can
be optionally equipped with a DTMF Receiver Unit (DTRU) to detect DTMF tones. If a DIDB is
used, a DTRU is required; it does not necessarily have to be mounted on the DIDB, but it must
be installed within the system.
»
Add-on Boards: DTRU
Table 1-2: CO Interface Boards
Board Name
Function
DIDB
Provides 4 Direct Inward Dial Lines
LCOB
Provides 6 Loop Start CO Lines
LCOBC
Provides 8 Loop Start CO Lines with Caller ID
LCOBE
Provides 8 Loop Start CO Lines
VOIP
Provides 8 VOIP interface over LAN
T1IB
Provides 24 channels
PRIB
Provides 23 bearer channels and 1 data channel
BRIB
Provides 2 bearer channels and 1 data channel
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