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Telephones and Consoles Description, Installation, and Operation
308
Digital telephones line engineering
Contents
This section contains information on the following topics:
Engineering a telephone line. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
Selecting a Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
Calculating DC Loop Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299
Performing Loop Diagnostic Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300
Measuring Impulse Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
Measuring Background Noise. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
Calculating Expected Pulse Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 302
Measuring DC Loop Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306