Toshiba Strata CT, Installation & Maintenance Manual

Page: 265 / 385

Fault Finding
Strata CT I&M Manual October 2000
8-7
Fault Isolation Flowcharts
The following troubleshooting flowcharts are available to aid in fault isolation. Toshiba
recommends reading the previous text in this chapter before proceeding to
Flowchart 8-1 on
Page 8-8 to begin fault isolation.
Table 8-4 Station Cable Continuity Check for Electronic Telephone Cables using
Ohmmeter
From To
Voltage
Pair Wire Colour Pair Wire Colour
1 T Green
1
1.
The green-red, black-yellow and white-blue measurements should be within 10% of each other.
2 T Black open
1 R Red 2 T Black open
1 T Green 2 R Yellow open
1 R Red 2 R Yellow open
1 T Green 1 R Red 40 ohms
2
2. This is the maximum allowable reading for all digital and electronic telephone cable runs except if connecting an
HDSS console to circuits 7 and 8 of a PEKU, then the maximum cable restriction is 20 ohms, not 40 ohms.
2 T Black 2 R Yellow 40 ohms 2
3 T White 3 R Blue 40 ohms
2
3 T White 1 R Red open
3 R Blue 1 R Red open
3 T White 1 T Green open
3 R Blue 1 T Green open
3 T White 2 T Black open
3 R Blue 2 T Black open
3 T White 2 R Yellow open
H
C