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Page 306 of 504 Digital telephones line engineering
553-3001-367 Standard 3.00 August 2005
Measuring DC Loop Resistance
Measure DC loop resistance by using standard procedures.
Note: The DC loop resistance limit of 175 ohm should be reduced by
1 ohm for each one percent of the total loop that is aerial cable.
Table 43
Attenuation at 256 kHz for U/C cable
WE 4-pair AMP 25-pair
dB/kft dB/km dB/kft dB/km
4.6 15.3 19.0 63.3
Table 44
Attenuation at 256 kHz for D inside wiring cable
NT WE Superior General
dB/kft dB/km dB/kft dB/km dB/kft dB/km dB/kft dB/km
4.0 13.3 3.2 10.7 3.7 13.3 4.6 15.3