Re:Re: Lab 1 - bit stuffing

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Posted by John Chappel on January 25, 1998 at 13:52:38:

In Reply to: Re:Re: Lab 1 - bit stuffing posted by Jim on January 25, 1998 at 12:26:03:

: : : So I guess the answer is 11111111, 1-Byte BEFORE
: : : is equal to 11111101 10000000, 2-Bytes AFTER?

: : Huh?

: OK, what I meant is:

: 1.) How big can the data your trying to send be? For example if the data you want to send is 11111111 (1-BYTE), then what is the format of this specific data when it comes out as packets? For example, from what Ive heard I take it to mean :

: HEADER-11111101-CRC-Se0-HEADER-10000000-CRC-Se0

: Thus 1-BYTE was actually sent out as 2-BYTEs due to bit-stuffing. 2 packets are needed to transmit even though 1 BYTE is the size of teh original data. And yes, I intenitalliy left out data_length copies.

: Hope this helps

Oh, I think I see your misunderstanding. The idea of
sending multiple copies of the same byte
was just to simplify the lab. If the data you wanted to
send was 2 copies of 11111111, what you would actually
transmit is:

HEADER-1111,1101,1111,1011,11-CRC_Se0

Notice there are still 16 1's being sent.

Bit stuffing is done on the entire transmitted stream, not on individual
bytes.

I hope that helps.

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Re:Re: Lab 1 - bit stuffing Thomas Morgan 22:15:13 4/22/99 (0)

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Comments:
: : : : So I guess the answer is 11111111, 1-Byte BEFORE : : : : is equal to 11111101 10000000, 2-Bytes AFTER? : : : Huh? : : OK, what I meant is: : : 1.) How big can the data your trying to send be? For example if the data you want to send is 11111111 (1-BYTE), then what is the format of this specific data when it comes out as packets? For example, from what Ive heard I take it to mean : : : HEADER-11111101-CRC-Se0-HEADER-10000000-CRC-Se0 : : Thus 1-BYTE was actually sent out as 2-BYTEs due to bit-stuffing. 2 packets are needed to transmit even though 1 BYTE is the size of teh original data. And yes, I intenitalliy left out data_length copies. : : Hope this helps : Oh, I think I see your misunderstanding. The idea of : sending multiple copies of the same byte : was just to simplify the lab. If the data you wanted to : send was 2 copies of 11111111, what you would actually : transmit is: : HEADER-1111,1101,1111,1011,11-CRC_Se0 : Notice there are still 16 1's being sent. : Bit stuffing is done on the entire transmitted stream, not on individual : bytes. : I hope that helps. : JC

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