Issue HWIC-2T

youssef_1985 · ‎10-17-2009

Hi,

in my lab Back to back with 2801 IOS ver 12.4(24)T1 and two card HWIC-2T the following tests were doing:

*when i use the CAB-SS-X21MT and CAB-SS-X21FC cables

Result:

the highest clock rate that can be supported is 1000000 and lower

*when i use CAB-SS-V35FT & CAB-SS-V35MT cables

Result:

the clock rate supported is 8000000. "Fine"

there's someone to explain this result

Giuseppe Larosa · ‎10-17-2009

Hello Youssef,

if you compare V.35 and X.21

V.35 pinout is here

or

and For X.21

you can see V.35 uses differential signals and has separated clocks for each direction.

These two facts provide a clear performance advantage of V.35 over X.21

Hope to help

Giuseppe

r-godden · ‎10-18-2009

V.35 uses differential signals and has separated clocks for each direction.

How is that an advantage having 2 seperate clocks ?

paolo bevilacqua · ‎10-19-2009

Because it reduces noise hence allowing higher clock.

Note: your rating of 3 to Giuseppe's answer that is 100% complete and correct is not fair. My rating - a "5".

hindhabaoui · ‎10-19-2009

Hi,

Thank you all for your reply.

I send by error the rating for Guistar.