[nsp] Making a CAB-5MODEM

From: Jon Lewis (jlewis@inorganic5.fdt.net)
Date: Fri Aug 14 1998 - 17:41:58 EDT

I'd like to make my own CAB-5MODEM DB25-RJ45 adaptors as I'm short a few
and have bags of bulk DB25-RJ45 adaptors.

From cio.cisco.com, I found: 

---
Question:

      What pinouts are required for the AUX ports and for the async ports
on the Communication Servers
      (25xx, ASM, CS-500)? 

Answer:

Use a ROLLED cable. Use a CAB-MMOD aka CAB-5MODCM. If you do NOT use a
rolled cable, reverse pins 1-8 in
the below chart 

Adapter for modem, assuming use of a ROLLED RJ-45 cable 

RJ45    DB25    Signal name
1       5       CTS
2       8       CD
3       3       RxD
4       7       GND
5       7       GND
6       2       TxD
7       20      DTR
8       4       RTS
---

What's the deal with running 2 RJ45 wires into DB25 pin 7?  That's kind of
a PITA to do using standard kits.  Are both necessary?  Can one of the
RJ45 pins 4 or 5 be put somewhere else or left floating without causing
trouble?

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