Specifications

Section 2: PCB Installation and Startup
2-24 ◆ Section 2: PCB Installation and Startup Aspire S Hardware Manual
Analog Trunk (4COIU-S) PCB (Figure 2-11)
The Analog Trunk (COIU-S) PCB provides:
● 4 analog loop start line/trunk circuits - no ground start is provided
● 4 trunk status LEDs
● 4 Caller ID Circuits
● 1 Power Failure Transfer Circuit
● 1 PCB status LED
The CN5 and CN7 connectors each provide connection to 2 analog trunk ports, which are polarity sensitive
(tip to tip, ring to ring). The power failure circuit, however, is not polarity sensitive. A maximum of 2
4COIUs per system is allowed.
LED Indications
LED Function LED Status Operation Status
LD5
(PCB Status)
Indicates the status of
the PCB.
Green On Initializing
Green Flashing
(slow flash)
Initialization problem
occurred during self-check.
Green Flashing
(100ms On/Off)
Operating normally
Green Off Downloading
LD1 - LD4 Indicates the status of
the lines.
Red On Line in use
Red Off Line idle