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Table Of Contents

Section Description Page No.

1. Signaling Classifications #

2. The Early Days #

3. Single-Frequency Signaling #

4. Multi-Frequency Signaling #

5. Loop Signaling #
5.1 Loop Start Signaling #

6. E&M Signaling #

Signaling Classifications

The two major signaling classifications are Interoffice signaling, or signals transmitted between central offices, and Subscriber loop signaling, or signals transmitted between the central office and the subscriber. Signaling intelligence transmitted over subscriber loops is further subdivided into three primary categories. They are:

• Information Signals – Information signals are audible tones within the voice frequency range. They communicate to the subscriber or operator, intelligence relative to the status of a call. This includes informing the subscriber that dialing may begin (dial tone), alerting the far-end subscriber of an incoming call (ringing),......

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Approximate Word Count: 4058
Approximate Pages: 17 (250 words per double-spaced page)

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