Fault Finding
Station Cable Continuity Check
14-8
Strata DK I&M 6/00
Ohmmeter Test
Check the continuity of the cable run between the KSU/cabinet and digital or electronic telephone
with an ohmmeter.
➤
To perform the ohmmeter test
1. Disconnect the DSS console, electronic or digital telephone.
2. At the MDF, remove the bridging clips.
3. At the MDF, place shorting jumper wires between the T and R of pair #1 (green-red), the T
and R of pair #2 (black-yellow) and the T and R of OCA pair #3 (blue-white), for PEKU/
PESU only. (For MDF pin numbers, see
Chapter 10 – Universal Slot PCB Wiring
4. At the modular block, measure the resistance between all wire combinations. The proper
readings are shown in
for digital telephones, DDSSs, DDCBs and
electronic telephones and HDSSs.
5. An improper reading indicates an open, crossed or shorted wire.
(DK14), or
(DK40i), or
(DK424).
Table 14-2
Station Cable Continuity Check for Electronic Telephone Cables using Voltmeter
From
To
Voltage
Pair
Wire
Color
Pair
Wire
Color
1
T
Green
1
1.
The green-red, black-yellow and white-blue measurements should be within 10%
of each other.
2
T
Black
24
2
2.
Nominal voltage—within limits of
±
26.3 ~
±
27.8VDC while under AC power,
polarity depending on voltmeter lead placements.
1
R
Red
2
T
Black
24
2
1
T
Green
2
R
Yellow
24
2
1
R
Red
2
R
Yellow
24
2
1
T
Green
1
R
Red
0
2
T
Black
2
R
Yellow
0
3
T
White
3
R
Blue
0
3
T
White
1
R
Red
0
3
R
Blue
1
R
Red
0
3
T
White
1
T
Green
0
3
R
Blue
1
T
Green
0
3
T
White
2
T
Black
0
3
R
Blue
2
T
Black
0
3
T
White
2
R
Yellow
0
3
R
Blue
2
R
Yellow
0
Summary of Contents for Strata AirLink DK40i
Page 22: ...Introduction Related Documents Media xx Strata DK I M 6 00 ...
Page 48: ...DK14 Installation DK14 Wiring Diagrams 1 26 Strata DK I M 6 00 ...
Page 220: ...DK424 Installation Remote Cabinet Installation Instructions 5 68 Strata DK I M 6 00 ...
Page 262: ...DK424i Configuration Primary Reserve Power Cabinet Hardware 6 42 Strata DK I M 6 00 ...
Page 450: ...Universal Slot PCB Wiring Option Interface PCB Wiring Diagrams 10 42 Strata DK I M 6 00 ...
Page 592: ...Peripheral Installation Enhanced 911 Service E911 12 84 Strata DK I M 6 00 ...
Page 616: ...ACD Installation Spectrum Electronic Wall Boards 13 24 Strata DK I M 6 00 ...
Page 634: ...Fault Finding Fault Isolation Flowcharts 14 18 Strata DK I M 6 00 ...
Page 704: ...ISDN Interfaces ISDN Disconnect Cause Code 16 54 Strata DK I M 6 00 ...
