Eric Blossom wrote: > On Thu, Jun 22, 2006 at 03:32:10PM -0500, Brett L Trotter wrote: >> I've got two machines with one usrp each using basic tx/rx board pairs. >> >> As soon as I start tunnel.py on each and set the ip's, one machine >> (usually the one started second) starts showing BBBBBBBBBBBBBBBBB..... >> >> If i disconnect wires, both sides go silent, reconnect and one or both >> start showing BBBBBBBBBBBBBBBBb... >> >> what is the 'B' anyway? > > 'B' means "backoff". > It prints a B everytime it attempts to transmit if it detects carrier. > >> I cannot ping between the hosts.. what am I missing? > > First off, this example will only work with RFX-* daugherboards, not > the basic tx and rx board. Why: we currently can't enable/disable the > transmitter on the basic tx board. > > If using a RFX-* board and you see this, try setting the rx gain lower > and/or the carrier sense threshold higher. > > $ tunnel --help > > will give help ;) > > Eric >
Thanks for your wonderful help and patience so far. I've gotten rid of the B's with sufficently high -c options, but ping still isnt happening.. A: ./tunnel.py --freq 102.0M --bitrate 500k -c 80 (other terminal) ifconfig gr0 10.10.10.1 (other terminal) ping 10.10.10.2 also tried with route add -host 10.10.10.2 gr0 B: ./tunnel.py --freq 102.0M --bitrate 500k -c 80 (other terminal) ifconfig gr0 10.10.10.2 (other terminal) ping 10.10.10.1 also tried with route add -host 10.10.10.1 gr0 both pings fail.. though I'm getting nice Tx: len(payload) messages with sizes from 42-283 on both sides. I've got to be missing something silly at this point- i've got cables between the machines RX->TX and TX->RX cross connect with SMA cable, though cables are about 1M (I don't have 3M cables just this second). Could cable length be my problem? Thanks again. _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
