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Details of discrepancies in advance Technical Paper-1 (General), Reference: SET-C = = = = = = = = = = = = = = = = = = = == = = = = = = = = = = = = = == = = = = Q.2 What is maximum bit rate in Basic Rate ISDN connection?

A. 128 kbps C. 284 kbps B. 144 kbps D. 2048 kbps Answer marked in Provisional key supplied by BSNL is B-(144 kbps) Explanation of Discrepancy: there are three possible answers Maximum bit rate in Basic Rate ISDN connection including basic channel bits (2B=64 kbps) + data channel bits (D=16 kbps) + synchronization and framing bits (=48 bits) is 192 kbps called maximum connection interface bit rate. If we exclude synchronization and framing bits (=48 kbps) it is 144 kbps Called maximum channel bit rate or transmission bit rte. if we exclude data channel bits it is 128 kbps which is actually available to the customer in Basic Rate ISDN connection and called maximum connection bit rate or customer throughput.

One can not differentiate the meaning of maximum bit rate hence in case of question under subject i.e. ISDN BRI connection may also be tken the bit rate which is actually to the customer hence most appropriate answer is 128 kbps.

Reference: J.T.O. (Phase I) : Supplement to FEE, Module 7 page no. 45 (attached herewith and marked as Annexure-1) Request: question is not clear and there are two possible answer available in option as explained above hence considering the Discrepancy in question full mark should be awarded to all examinees.