2.17 Isolating Failures
Section 2.17 will help you to find and identify problems that might occur in the digital telephone
system.
2.17.1
Checking The System Status Indicator
A red LED located on the common equipment cabinet near the music port is the system status
indicator. This indicator light comes on when power is supplied to the system. If the indicator
flashes after power up, it signals that the processor has failed or that the software cartridge is not
installed. Unplug and reconnect the AC power to the power supply and observe the LED
indication. If it still shows a flashing indication, equipment replacement may be necessary.
2.17.2
Testing The Stations
To test the multiline stations for proper operation:
1. Disconnect line cord at station base.
2. On DigiTech telephones, press and hold the MUTE button.
On Impact and Impression telephones, press and hold 1 on the keypad.
Station will automatically perform self test routine.
3. Release test button as soon as test begins. Sequence of test is as follows:
a. indicators will light in sequence,
b. ringer will sound—be sure volume is set to low or high,
c. indicators and ringer will then turn off at the same time.
4. Replace any station that does not pass the self test.
IMI66–107
Digital Telephone System
Installing The DSU 2 – 53
Summary of Contents for Air Impact DSU
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