PLease clarify

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Posted by Jim on January 25, 1998 at 12:33:15:

In Reply to: Re: an0ther question posted by John Chappel on January 25, 1998 at 11:48:48:

: : The NRZI encoding depends on knowing what the previous
: : value is (0 or 1). In the lab, we know that the
: : beginning of the header is preceeded by se0, which is
: : neither 0 or 1. So what should the NRZI encoding start
: : off with?

: Start with a 0.

Meaning what?

Regardless of weather the data starts with a 0 or 1? That doesnt make sense, because if your first bit is a zero or a 1, then the first transmitted bit will be zero?
Then you dont know what was sent, unless you send n+1 bits. Ie always atrt with a zero, then procced from there. But that violates the rule of header size being 4 bytes.

If you say start a 0 with a 0, and start a 1 with a 1, then you get

101.... NRZI-> 100
010.....NRZI-> 001

Jim

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Re: PLease clarify John Chappel 14:17:13 1/25/98 (0)

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: : : : The NRZI encoding depends on knowing what the previous : : : value is (0 or 1). In the lab, we know that the : : : beginning of the header is preceeded by se0, which is : : : neither 0 or 1. So what should the NRZI encoding start : : : off with? : : Start with a 0. : Meaning what? : Regardless of weather the data starts with a 0 or 1? That doesnt make sense, because if your first bit is a zero or a 1, then the first transmitted bit will be zero? : Then you dont know what was sent, unless you send n+1 bits. Ie always atrt with a zero, then procced from there. But that violates the rule of header size being 4 bytes. : If you say start a 0 with a 0, and start a 1 with a 1, then you get : 101.... NRZI-> 100 : 010.....NRZI-> 001 : Jim

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