Ohmmeter Test - Toshiba Strata DK40 Installation & Maintenance Manual

Station Cable Continuity Check
Table 9-2 Station Cable Continuity Check for Electronic Telephone Cables using Voltmeter
From
Pair Wire
1
1
1
1
1
2
3
3
3
3
3
3
3
3
3
1
The green-red, black-yellow and white-blue measurements should be within 10% of each other.
Nominal voltage—within limits of ±26.3 ~ ±27.8 VDC while under AC power, polarity depending on voltmeter
2
lead placements.

Ohmmeter Test

Check the continuity of the cable run between the KSU 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, place shorting jumper wires between the A and B of pair #1 (green-red),
the A and B of pair #2 (black-yellow) and the A and B of OCA pair #3 (blue-white), for
PEKU/PESU only. (For MDF pin numbers,
Wiring.)
3. At the modular block, measure the resistance between all wire combinations. The
proper readings are shown in
Table 9-4
4. An improper reading indicates an open, crossed or shorted wire.
Replacement" on Page 2-21
Strata DK40 I&M Spring 1999
Refer to the Strata DK40 Programming Manual or DK Library CD-Rom for more details.
Colour
1
A Green
B Red
A Green
B Red
A Green
A Black
A White
A White
B Blue
A White
B Blue
A White
B Blue
A White
B Blue
for electronic telephones and HDSSs.
To
Pair Wire
2 A
2 A
2 B
2 B
1 B
2 B
3 B
1 B
1 B
1 A
1 A
2 A
2 A
2 B
2 B
See Chapter 4 – DK40 Universal Slot PCB
Table 9-3 for digital telephones, DDSSs, DDCBs and
Fault Finding
Colour Voltage
2
Black 24
2
Black 24
2
Yellow 24
2
Yellow 24
Red 0
Yellow 0
Blue 0
Red 0
Red 0
Green 0
Green 0
Black 0
Black 0
Yellow 0
Yellow 0
See "Power Supply
9-5