Clock Rate Problem = Low Bandwidth

[alhaj]

Ok heres the case. I have 2 2500 series routers connected via serial ports. One is DTE the other is DCE. Iam using PPP as the encapsulation. The thing is that I have the clock rate set at 148000. That gives me transfer rates between the routers at about 136kbs. Now if I try to increase the clock rate to 250000 or anything higher than 148000, serial line protocol goes down. I know that these routers can handle T1 speeds. Is it the encapsulation that I should change to be able to increase the speed or do I have to get different cables? Or is that the maximum speed for serial interfaces?

Thanks for any input.

 

[svermill]

I can't say for sure in the case of your specific router, but often times an interface will "handle" higher speeds than it is capable of gererating clock for. In other words, if you had a CSU/DSU providing clock at a higher speed, the protocol would stay up.

But that's just a generalization. I can't say whether or not 148k is the max in your case. Is this by chance RS-232?

 

[alhaj]

Yes it is RS-232 on both ends connected back to back.

 

[svermill]

Sorry for not seeing this yesterday. I think you got your answer though....