Re: Connecting cisco 2515 to 3Com Active token ring hub
The RJ45 is using pins 3,4,5, and 6. I believe pins 1 and 9 of the DB9 go to 4 & 5 of the RJ, and pins 5 & 6 of the DB9 go to 3 & 6 of the RJ.
The other issue is cable impedence. The DB9 is used with Shielded Twisted pair, and is 150 ohm. The RJ45 uses Unshielded Twisted pair, which is ~100 ohm.
The "cable" that is usually used also contains impedence matching components.
Anixter (www.anixter.com) has some adapter cables; the AMP cables used to be pretty cheap. Thre are also some adapters / headshells you can buy for the DB9 that do the impedence match and provide an RJ jack so you can use a standard UTP patch cable Cat4 or higher.
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