I've seen this in the on day of testing I've done with V.90. I used a
formerly X2 Sporster (which I upgraded to V.90) and ComOS 3.8b17. As I
only have ISDN at home (no POTS) I used two different ISDN to analog
converters: one was an Asus ISDNlink external TA which has two analog
ports and the other was the telco-supplied NT+2ab (made by Ascom).
When going through the Asus, the connection started around 46000 and then
renegotiated up to 50666, then the uplink speed started negotiating from
21600 up to 31200 and back down again. Also the downlink speed started
jumping from 49333 to 50666 back and forth. Of course every renegotiation
takes a couple of seconds and after enough renegotiations (about 20) the
link simply stopped - nothing in, nothing out.
Just moving this line out of the Asus A/D back to the telco NT+2ab gave me
a *very* stable 50666 with clear 5.68KB/s transmissions. So I guess
either Sporsters are heavily dependable on the quality of the A/D
conversion or PM3's are.
So either what we are seeing are two different problems or Sporster
flashes are as bad as Courier flashes :)
Blaz Zupan, blaz@medinet.si, http://home.amis.net/blaz
Medinet d.o.o., Linhartova 21, 2000 Maribor, Slovenia
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