Data Link Layer What does it do?. What functions it performs? Typically: Handling transmission errors. Error control. Flow control. Framing. Framing. The DDL and PHY. The Physical Layer delivers raw sequence of bits. Unreliable service.
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What functions it performs?
Handling transmission errors.
(a) Without errors. (b) With one error.
n = m + r.
T = 2rM + R [note G starts and ends with “1” ]
At Transmitter, with M = 1 1 1 0 1 1, compute
2rM= 1 1 1 0 1 1 0 0 0 with G = 1 1 0 1
R = 1 1 1
Transmit T= 1 1 1 0 1 1 1 1 1
At the Receiver, compute
Note remainder = 0 no errors detected
. What’s in T?
. What’s in H?
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