At 23:01/16/Apr, Larry Roberts (1:3808/10) said:
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LR> I talked to Askey, who makes Amjet modems, and they said that the 
LR> either my ISP is at fault, or my modem is defective, because if my line 
was 
LR> noisy, it would fall back to a speed that would allow it to operate 
LR> normally, which in my case would be 44K, but it logs in at 46K, and has 
LR> problems.
The modem _should_ fallback, and will if the right conditions occur.  That's 
not to say it will fall back in all cases, though.  It's normally triggered 
by some number of block errors in some time period.  So, if you were getting 
trigger-1 BLERS in the time period, the modem would _not_ fallback.
LR> I think it is the Uart that is defective. It can't keep up with the 46K 
LR> data stream, which is why it freezes every 2 min. for about 15 sec. If 
you 
LR> run a 14.4, or higher baud modem on a Uart that's slower than a 16550, it 
LR> has the same systoms, unless it connects below 9600baud.
The 16450 (and even the 8250) UART can easily handle speeds in excess of 
46kbps.  The UART cannot be the problem here, because there's nothing in the 
UART that can stop the flow of data - it has no "flow control" capability.  
The UART could be defective, but I'd expect that would result in the modem 
dropping the connection rather than the pause you're experiencing.
Try disabling V.42 and V.42bis - use MNP instead and see if there's an 
improvement.  You also might like to check the web for a utility that 
configures your MTU - there's one called MAXMTU, I believe.  A mismatch in 
MTU can cause problems similar to what you're seeing.
Rick
--- Msged 4.00
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