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Re: [aprssig] Re: MFJ-1270B & KISS mode



At 02:01 PM 3/1/99 -0700, you wrote:
>At 01:20 PM 3/1/99 -0700, I wrote:
>>
>>	I'm running the MFJ-1270B in KISS mode a bit.  Not all the time, just
>>kinda experimenting with it.
>>
>>	I notice that sometimes I'll try to send an ID or a Query or something,
>>and the TNC doesn't go into transmit mode right away.  At times, there is
>>considerable delay.  Maybe 15-20 seconds, maybe more.
>>
>>	Is this normal?
>
>	I guess I should have mentioned that there is ZERO traffic in this area.
>Zip, none, nada.  Zilch.  I'm usually the only station on RF here.


Earl, what you are seeing is the effect of p-persistance.  A random
back-off timer that ensures stations that transmit or retransmit after a
collision don't both have the same timing values and retransmit again only
to collide once again.


 - Steve
 (n7hpr@tapr.org)
 (n7hpr@amsat.org)

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