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Which of the following channel in USDC provides a signalling channel?

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Which of the following channel in USDC provides a signalling channel?

(a) DTC

(b) CVDCC

(c) SACCH

(d) FACCH

I had been asked this question by my college director while I was bunking the class.

I would like to ask this question from United States Digital Cellular (IS-54 and IS-136) in division Wireless Systems and Standards of Wireless/Mobile

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The correct option is (c) SACCH

The explanation: The SACCH (slow associated control channel) is sent in every time slot and provides a signalling channel in parallel with the digital speech. The SACCH carries various control and supervisory messages between the subscriber unit and the base station.

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