Issue HWIC-2T

Unanswered Question
Oct 17th, 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

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Overall Rating: 4.3 (3 ratings)
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Giuseppe Larosa Sat, 10/17/2009 - 10:37

Hello Youssef,

if you compare V.35 and X.21

V.35 pinout is here

http://telecom.tbi.net/v35.htm

or

http://www.interfacebus.com/Design_Connector_V.35_Interface.html

and For X.21

http://www.connectworld.net/x21.html

http://www.interfacebus.com/Design_Connector_X.21_Interface.html

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 Sun, 10/18/2009 - 14:40

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

How is that an advantage having 2 seperate clocks ?

Paolo Bevilacqua Mon, 10/19/2009 - 01:45

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 Mon, 10/19/2009 - 04:35

Hi,

Thank you all for your reply.

I send by error the rating for Guistar.

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