Issue HWIC-2T

Unanswered Question
Oct 17th, 2009
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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
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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
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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
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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
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Hi,


Thank you all for your reply.


I send by error the rating for Guistar.

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