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A transmission system is communicating using an HDLC Frame format
A transmission system is communicating using an HDLC Frame format. Furthermore it is using the Asynchronous Balanced Mode (ABM) configuration.
At the moment the receiver is sending an Information Frame to the transmitter. This is the 6th sequential message it is sending and it is acknowledging receipt of the 6th sequential message it received from the transmitter. The Poll/Final bit is set to 0.
What are the bit settings in the message's control field?
Expert Solution
Assuming the standard format (8 bits long) control field.
Since the message exchanged is an information frame, frame type is 1 bit long and has value 0.
Also given that the Poll/Final bit is set to 0.
Since we number frames starting from 0, 6th sequential message will be frame number 5.
N(S) = frame number being sent = 5 (6th sequential message)
N(R) = frame number currently expected = 6
N(R) indicates that all frames up to "N(R) - 1" i.e. frame number 5 (6th sequential frame) have been received.
Hence, given information message's control field
----------------------------------------------------------------------
| Type - 1 bit | N(S) - 3 bits | Poll/Final - 1 bit | N(R) - 3 bits |
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will look like "0 101 0 110" .
If you consider extended format (16 bits long) control field, N(R) and N(S) will be 7 bits long and the field will look like "0 0000101 0 0000110".
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