Catalyst 2950 Console cabling

Unanswered Question
Aug 19th, 2010

I have an rj45-rj45 rollover cable connected to an rj45-db9f straight through adapter which is then connected to a db9 serial cable.  I can't get a console connection to work in either PuTTY or Teraterm.  The session begins but I just have a blank screen with a cursor in the upper left and I can't input anything.  I have seen crossover rj45-db9 adapters and was wondering if this is what I need or whether it seems I have a bad connection somewhere.

I have this problem too.
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CSCO11751061 Thu, 08/19/2010 - 08:51

I was able to get it working by switching out my rollover cable with a standard straight-through ethernet cable.  I'm not quite sure why this works.  I just recently obtained my CCNA and I was under the impression a rollover cable was required.

Reza Sharifi Thu, 08/19/2010 - 08:58

The default Cisco console cable that comes with the device is rollover. You probably are using a straight-through Ethernet cable, but your adapter is rolled

Nagaraja Thanthry Thu, 08/19/2010 - 08:53


Seems like you have nailed it. You do need a proper db9-RJ45 converter for

this to work.



CSCO11751061 Thu, 08/19/2010 - 09:06

Huh,  my adapter is supposed to be straight through.  I used an extra db9 cable that came with a UPS I installed yesterday...might this be the cause?  I have a sabrent DB9 to USB cable on order so the cabling I had hoped to work was: RJ45 rolled ->RJ45-DB9f straight through adapter ->DB9m to USB serial.  Thanks for everyone's help!


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