Testing The Digital Station Installation
Making A Resistance Check
Measure the resistance at the station connector blocks under the following conditions.
•
AC power cord disconnected from electrical outlet.
•
Common equipment connected to station connector blocks.
•
Stations wired and wiring punched down on blocks.
•
Bridging clips removed from blocks to isolate stations from common equipment.
Measure the resistance of each installed station and wiring from the station side of the connector blocks.
Resistance values will vary with cable length and station type but should be within the following limits:
✔
Greater than 700 Kohms
Measure the resistance of the common equipment and cables from the common equipment side of the station
connector blocks. The resistance value should be within the following limits.
✔
40–50 Ohms
Making A Voltage Check
Make the following voltage measurements at the station connector blocks under the following conditions:
•
Bridging clips installed
•
AC power connected to the common equipment
Measure the voltage across the signal pair. The measured voltage must be within the following limits:
✔
28–36 VDC
Causing A Digital Station To Self Test
The multiline stations can be self tested for proper operation per the following instructions:
1. Disconnect line cord at station base.
2. Press and hold 1 for Imact and Impression telephones and MUTE for DigiTech telephones and reconnect line
cord to station connector. 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.
Testing The Digital Station Installation 11
Installing The Digital Station Board
IMI89–267
