5.0 Testing The Analog Station Installation
5.1
Making A Resistance Check
Make the following resistance measurements at the station connector blocks under the following conditions.
•
AC power cord disconnected from electrical outlet.
•
External battery back-up assembly disconnected.
•
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.
1. 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 limits shown in the
chart below.
2. Measure the resistance of the common equipment and cables from the common equipment side of the station
connector blocks. Resistance values should be within the limits shown in the chart below.
Making Resistance Measurements
Measured Pair
Resistance In Ohms
Multiline Telephone
Single Line Telephone
DSS/BLF Console
Common Equipment
Voice Pair
40–150
40–150
0.3–100
40–50
Data Pair
0.3–100
0.3–100
0.3–100
1–2
5.2
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 one voice line and one data line and then across the other voice line and the other data
line for each even and odd station. The measured voltage must be within the limits shown in the chart below.
Making Voltage Measurements
Station Under Test
66M-xx Block Connection
Meter Lead Polarity
Measured Voltage
Odd Station
Voice 1
+
+ 34 +/- 3 VDC
Data 3
-
Voice 2
+
+ 34 +/- 3 VDC
Data 4
-
Even Station
Voice 5
+
+ 34 +/- 3 VDC
Data 7
-
Voice 6
+
+ 34 +/- 3 VDC
Data 8
-
Varriant readings can indicate a possible wiring, station, or common equipment problem.
IMI89–173
Installing The Analog Station Board
14 – Installing The Analog Station Board
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