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Page 504 of 532
Performing Loop Diagnostic Tests
553-3001-367
Standard 1.00
2
Add the total of all cable sections. If the total of all sections exceeds
175 ohm, select another loop.
Note: The loop resistance limit of 175 ohm must be reduced by 1 ohm for
each percent of the loop that is aerial cable (see Table 75 on
Table 75
Conductor resistance per unit
Gauge
26
24
22
19
The following equipment is required for the loop diagnostic tests in
Procedure 64 on
page
•
one volt-ohmmeter (VOM) for each test
•
one 77 cable analyzer or equivalent for each test
Procedure 64
Testing foreign voltage
1
Set the VOM range switch to a scale 60 V dc/V ac or greater.
2
Connect the VOM test probes to the loop at the line card or distributing
frame.
3
Measure the DC and AC voltage between the following points under
no-load conditions:
•
tip (T) and ring (R)
•
T and ground (GND)
•
R and GND
Requirement: Voltage readings should be less than 1 V dc/V ac.
October 2003
Ohm per loop kft
83
52
33
16
504:
page
504).
Ohm per loop km
278
173
109
54
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