Analog Trunk (4Coidb) Daughter Board (Figure 2-28 - Figure 2-35) - NEC UX5000 Hardware Manual

Chapter 2 - PCB Installation and Startup
2.7.2

Analog Trunk (4COIDB) Daughter Board (Figure 2-28 - Figure 2-35)

The 4COIDB is used to provide 4 additional ports for loop/ground start trunks. The PCB is connected to a
4COIU PCB to provide a total of 8 ports for the combined PCB (refer to 2.7.1 Analog Trunk (4COIU) PCB
(Figure 2-27) on page 2-53).
This daughter board can also be installed on the Digital/SLT Combination PCB (082U). This combined PCB
will provide 8 digital extension ports, 2 analog extension ports, and 4 trunk ports.
The analog trunk daughter board provides:
●
4 analog loop start/ground start trunk circuits
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4 Caller ID Circuits
●
Connector for COIU or 082U PCB
The 4COIDB consumes 4 trunk ports ranging between ports 001-200. The CN2 connector provides
connection to 4 analog trunk ports, which are polarity sensitive (tip to tip, ring to ring). The power failure
circuits (CN3), however, are not polarity sensitive.
2 - 56
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When using the COIU/COIDB for ground start trunks, the PBX ground
must be connected as described on page 1-55 or the trunks will not
function correctly.
●
The trunk ports are polarity sensitive. Be careful when wiring the trunks.
●
When connecting the RJ61 cables to the COIU/COIDB, note the
position of the Power Failure connector (CN3). Do not confuse this
connector as the trunk connector (CN2).
●
Switching from Loop Start to Ground Start is set in system
programming.
! Important !
Chapter 2