Section 2: Components
16 Product Description
4 CO Loop Start/Ground Start Trunk Card (4COIU-LG1) — P/N 0891029
There are two different types of the COIU PCB. One providing ground start trunks - the other is for
loop start trunks only.
The 4COIU-LG1 PCB provides:
● 4 analog ground start / loop start trunk circuits
● 4 trunk status LEDs
● 4 Caller ID Circuits
● 2 Power Failure Transfer Circuits
● 1 PCB status LED
● 1 run/block switch
The CN3 connector provides connection to 4 analog trunk ports, which are polarity sensitive (tip to
tip, ring to ring). The power failure circuits, however, are not polarity sensitive. A maximum of 15
4COIU-LG1 PCBs per system is allowed.
! Important!
● When using the COIU-LG1 PCB for ground start trunks, the PBX ground must be connected
or the trunks will not function correctly.
● When connecting the RJ61 cables to the COIU PCB, note the position of the Power Failure
connector. Do not confuse this connector as the trunk connector.
8 CO Loop Start/Ground Start Trunk Card (8COIU-LG1) — P/N 0891028
The 8COIU-LG1 provides the same features as the 4COIU-LG1 except for the following changes:
The 8COIU-LG1 PCB provides:
● 8 analog ground start / loop start trunk circuits
● 8 trunk status LEDs
● 8 Caller ID Circuits
● 2 Power Failure Transfer Circuits
● 1 PCB status LED
● 1 run/block switch
The CN3 and CN5 connectors each provide connection to 4 analog trunk ports, which are polarity
sensitive (tip to tip, ring to ring). The power failure circuits, however, are not polarity sensitive. A
maximum of 15 8COIU-LG1 PCBs per system is allowed.
! Important!
● When using the COIU-LG1 PCB for ground start trunks, the PBX ground must be connected
or the trunks will not function correctly.
● When connecting the RJ61 cables to the COIU PCB, note the position of the Power Failure
connector. Do not confuse this connector as the trunk connector.
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