Trunk Pcbs; Analog Trunk (4Coiu) Pcb (Figure 2-27) - NEC UX5000 Hardware Manual

S 2-7
ECTION

Trunk PCBs

2.7.1

Analog Trunk (4COIU) PCB (Figure 2-27)

The 4COIU is used to provide 4 ports for loop/ground start trunks. The PCB can accept a 4COIDB to provide
an additional 4 ports (refer to 2.7.2 Analog Trunk (4COIDB) Daughter Board (Figure 2-28 - Figure 2-35) on
page 2-56).
The COIU PCB provides:
●
4 analog loop start/ground start trunk circuits
●
1 trunk status LED
●
1 PCB status LED
●
4 Caller ID Circuits
●
2 Power Failure Transfer Circuits
●
Connection for COIDB Daughter Board
Trunk I/F Circuit #2
Trunk I/F Circuit #1
CN2(COIU)
Analog Trunk
From Central Office
for Interface Circuit.
#1-#4
CN3
SLT I/F for
Power Failure
Transfer
#1-#2
BUSY LED
(Status for Trunk Lines)
ON: Trunk in Use
OFF: Idle
LIVE LED
(Status LED)
Chapter 2
Trunk I/F Circuit #3 Trunk I/F Circuit #4
CN5
Pin Number
Location
8
7
6
5
2
1
Figure 2-27:
Chapter 2 - PCB Installation and Startup
CN4
CN1
Common
Control
Circuit
CN2(COIDB)
Analog Trunk
From Central Office
for Interface Circuit.
Trunk I/F Circuit #4
#5-#8
4COIU PCB
Daughter Board I/F
(for COII/082U/002U)
Trunk I/F Circuit #1
Trunk I/F Circuit #2
Trunk I/F Circuit #3
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