When the router interface is the DTE interface, the clockrate 9600 will not be in effect since the clockrate is driven from the DCE interface. The problem here is distance-adding the modem creates delay and distance. Technically, at 9600, the length is 50 ft for RS232 and the delay introduced by the modem probably accounts for the equivalent of 50 ft. However, with a quality cable, you probably can run a RS232 or V35 cable to 100 ft and run 4800 clockrate on the router without modems.
I am a bit pusseled with the statement that you changed the cable from DTE to DCE between the router and the modem. Typically the modem provides the clock in such an environment and the 2600 should be DTE.
If for any reason the modem does not provide the clock and the router needs to provide the clocking than you need to have a dce cable attached to the router and you must have a clock rate configured on that interface.
The router will not allow you to configure a clock rate on a DTE interface.
I guess you need to get a better understanding how your modems are configured and how they are supposed to work.
The config sniplet you provided looks ok as far as i can say.
You can only have one clock source, either the modem or the router. With the DTE cable, the modem should be providing clocking. It sounds like there is a problem in this area with the modems. The modem connected to the ATM would provide clock to the ATM and the modem attached to the 2600 would provide clocking to the 2600. Both modems should be set for the same clock rate, which should be 9600 it seems.
The 2600 only supplies clock when it has a DCE cable and clock rate is configured.
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