Suppose the following HDLC sequence bits are transmitted on a link. Show the res

Question

Suppose the following HDLC sequence bits are transmitted on a link. Show the resulting sequence of bits with removed bit stuffing. 1101 0111 1101 0111 1100 1011 1110 110 the network transmission channel bit error rate is 0.00001, and each packet's total length is 1024 bytes including all overheads. Assume there are no other overheads, and assume the channel error model is random error model (i.e. errors could happen anywhere with equal probability). For each data packet transmitted over this error-prone channel. what is the Packet Error Rate (PER) for each single round of packet delivery? If one ARQ retry is applied, (i.e. total rounds of transmissions are 2. including I initial transmission, and I additional retry), what is the final average probability of packet error?

Explanation / Answer

2)

after stuffing the sequence is:1101 0111 1100 1011 1110 0010 1111 1001 10

in bit stuffing after every consecutive 1's 0 will be joined.

after removing the bit stuffing the result look like:here * represnt the place where the added 0 is presented.

1101 0111 11*01 0111 11*00 1011 111*0 110

3)

3.1)

the bit error rate=0.00001,length of packet=1024 byte.

1byte=8bits

so packet error rate=1024*8*0.00001=0.08192

that is 8.192% of packets corrupted.

3.2)

The corrupted packets have a chance for retry.even thus also going to fail.

so the number of packets going to fail even the retry=0.08192^2=0.006710886 or 0.6710% will go to to fail in single retry.

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