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The technique for separate but parallel signalling channel is called ________

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The technique for separate but parallel signalling channel is called ________

(a) Common channel signalling

(b) Forward channel signalling

(c) Reverse channel signalling

(d) Separate channel signalling

The question was posed to me during an interview.

Question is taken from Wireless and Fixed Telephone Networks in chapter Wireless Networking of Wireless/Mobile

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Correct option is (a) Common channel signalling

Explanation: During the mid 1980s, the PSTN was transformed into two parallel networks- one dedicated to user traffic, and one dedicated to call signalling traffic. This technique is called common channel signalling.

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