On 10/31/2011 06:40 PM, Tuan (Johnny) Ta wrote:
Marcus,
What do you mean my zero-stuffing the TX frames? And how would it help
with the turn-around time of the XCVR2450 daughterboard? Do you mean I
should transmit a zero-filled packet before any real packet, so that
the receiving side (A in my scenario) has time to switch back to
receiving before the real packet arrives?
The transmit side assumes that the combination of RX-to-TX and TX-to-RX
transition experienced by both sides is non-zero. So, you get
the transmit side to simply send some idle 0s, and *then* the actual
start-of-frame data, etc. What happens in these situations in my experience
is that the start-of-frame gets missed during the switchover
interval. So if the transmit side sends zeros (or, really, anything
other than
the start-of-frame sequence) for a "little while" after commencing a
transmit burst, you're less likely to run into TX-to-RX transition issues.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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