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A 3000-km-long T1 trunk is used to transmit 64-byte frames using Go-Back-N protocol. If the propagation speed is 6 microsecondkm how many bits should the sequence numbers be?
Wiki User
∙ 9y ago
Propagation time = 6 usec/km × 3000 km = 18 ms
Speed(T1) = 1.536 Mbps
Transmission time for a frame = 64byte × 8 / 1.536Mbps
= 0.3 ms
Total transmission time for a frame and its ack
= 2 × propagation time + transmission time for a frame
= 2 × 18ms + 0.3ms = 36.3ms
Window size = 36.3ms / 0.3ms = 121
As 27 = 128 > 121, so the sequence numbers should be 7 bits.
Wiki User
∙ 9y ago
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