Re: ISDN modem problems
I use a Zyxel OMNI TA 128U (almost the exact same beast) with a single 64K
channel. It has no problems. My server machine is a P90 overclocked to 100 with
40MB of memory. Perhaps you're getting buffer overruns on your serial port. What
baud rate are you running your serial port at?
Christian Lynbech on satellite wrote:
> I have just got myself an ISDN line and a Zyxel Omni.net plus modem,
> but I have problems in getting it to work smoothly.
>
> The problem is that I keep getting error messages saying something to
> the effect of:
>
> ppp: frame with bad fcs, excess = 4de9
>
> The more trafic (for instance with ping) I generate, the less packages
> comes through. The limit seems to be around packet sizes of 2048/4096.
>
> If I stress my machine (which is a pentium 75 with 48Mb of RAM, a
> couple of years old), more packages are dropped.
>
> If my machine is only lightly loaded, pppd will only come up if I use
> the option:
>
> kdebug 7
>
> Otherwise it fails rather eraly in the initial negotiations when a
> ConfReq never sees the corresponding ConfAck.
>
> However, if I run a heavy job (such as a kernel compilation), the
> kdebug is not necessary to get pppd up. It will drop a few packages
> with ping -s 4096, but now silently. With ping -s 8192, almost nothing
> gets through.
>
> If I run X11, the connection can not get up (with kdebug 7).
>
> Does anybody have an idea where and how I should investigate? Should I
> suspect my serial port? Is my machine simply too slow to handle a
> 64kps connection? Is there any kernel option I can set?
--
Jens B. Jorgensen
jjorgens@bdsinc.com
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