Here's the setup for wiring a RJ-45 to db-9/db25 module using a straight
network cable (NOT the Cisco roll over cable):

RJ-45	DB-9	DB-25
-----	----	-----
  1       8       5    RTS
  2       6       6    DSR
  3       2       3    RxD
  4                    GND
  5       5       7    GND
  6       3       2    TxD
  7       4      20    DTR
  8       7       4    CTS

HTH, rna  

On Fri, 10 Dec 2004, Scott Denlinger wrote:

> Hi everyone,
> 
> I'm trying to make a console management cable for my Cisco uBR904 cable modem,
> since it didn't come with one when I bought it on eBay, and I'm wondering if
> anyone can help me with the pin-outs. It's a serial cable with RJ-45 on the
> modem end, and DE-9 on the computer end.
> 
> In general I know you need to cross the TX and RECEIVE pins for serial
> connections, but do you need to do the same for DTR and DSR? Or does DSR on the
> cable modem connect to DSR on the computer's serial port, and DTR go to DTR?
> Should my pinouts go like this
> 
> modem     computer
> TX   ---> REC
> REC  ---> TX
> DTR  ---> DTR
> DSR  ---> DSR
> 
> 
> or like this?
> 
> modem     computer
> TX  --->  REC
> REC --->  TX
> DTR --->  DSR
> DSR --->  DTR
> 
> (note that I'm not necessarily indicating signal direction in the above, just
> connections)
> 
> And perhaps a more general question: can I get this modem to work with Cox
> Internet service using just the factory defaults, or is there some specific way
> I need to configure the Cisco IOS for the modem to work. I bought it before I
> realized it wasn't on Cox's "supported modems" list, and perhaps there's a
> reason for that, but I'd like to solve the challenge of trying to get this to
> work. Based on my limited reading on this, it seems that Cox sends down a
> configuration file to whatever cable modem you've got hooked up, which doesn't
> match up with whatever specs the uBR904 is set for. (You can tell I have a lot
> to learn about all this!) I've Googled for the appropriate settings, but
> haven't had any luck finding useful info., so pointers to useful URLs or
> newsgroups would be appreciated.
> 
> Thanks very much in advance.
> 
> Scott Denlinger
> sbd@u.arizona.edu
> 
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