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Signalling component that supports traffic between the end-user and network is called ________

(a) Network signalling

(b) Digital subscriber signalling

(c) Access signalling

(d) Subscriber system signalling

I have been asked this question by my college professor while I was bunking the class.

Question is taken from Integrated Services Digital Network (ISDN) in portion Wireless Networking of Wireless/Mobile

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Correct choice is (c) Access signalling

The best I can explain: Access signalling supports traffic between the end user and the network. It defines how end users obtain access to the PSTN and the ISDN for communication or services.

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