I'm fairly certain you do not need to cross the DTR and/or the DSR leads, 
ergo the first example appears correct.  As for using this product with 
Cox...I cannot say.

Frank

----- Original Message ----- 
From: "Scott Denlinger" <sbd@u.arizona.edu>
To: <plug-discuss@lists.plug.phoenix.az.us>
Sent: Friday, December 10, 2004 11:58 AM
Subject: Cisco uBR904 and serial cabling questions


> 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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