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pin outs anyone?

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by techxan

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I need a source for common (and uncommon) pin outs for cables and adapters used in the networking and telephony support business. Lately I have recently needed a loopback plug for a T1 circut, a V.35, and a terminal connector and rollover (not crossover) cable for a cisco router. (Yea, I know there ought to be one with the router but aparently someone needed it worse than me.)

Do I need a 56K and DSL loopback in my kit? Do different flavers of DSL use different loopback plugs?

And if anyone knows...same money for first answers to these Q's.

1: Can I hook two computers together with custom adapters and custom patch cables?

DB 25 to Cat 5? DB9 to Cat 5?

2. Can two computers communicate modem to modem without calling out thru a telephone interface? Or will there be a lack of carrier? If a lack of carrier,is there a software carrier enulator I could run on the host?

3. Where can I learn about the modern networking components that are in use and I am seeing onservice calls? I mean I have an MCSE, but what about DSU/modem/router/hub setups. Are these in the telephony world?

5 replies

by highlndr

I remembered a site I stumbled across a while back, www.wiring.com. They had one section called 'pinouts'; the direct link to that is http://network.wiring.com/pin_outs.html. That particular page had info on all the CAT5 wiring pinouts, but it also had 2 additional links, one of them for Cisco cables, and I noticed that it did cover rollover cables. You might want to check it out.
As for your DSL loopback you're looking for, I'm 99% sure that all DSL modems use the same signaling lines, so youshould only need one loopback.

And here's my input for the first of your last 3 questions:
1) I have seen 2 computers communicating through custom DB9 connectors across standard straight through cable, so I know it can be done successfully. Wiring a DB25 connector shouldn't be any different.

2) I'm not a communications specialist, but I've never heard of a modem communicating without getting a dial tone and dialing a service. If I may ask, what situation would you ever be in where you'dwant to run a direct line via a modem between 2 PC's instead of using NICs? For that reason, I don't believe there's any emulator out there for the modem to work properly. Just curious.

3) I'd say if you want to get the nitty gritty of DSU's, routers, etc., you ought to see about jumping into a Cisco or Nortel certification track. Either one will most likely give you more info than you need.

by electricdragon

Hi,
I can give you an answer to question number two.
Yes, you can connect two computers w/out going through a service.
But, it's only good for sending/receiving
files, and was done sometimes in the old day's. if you want to do this you need to buy what's called a "null modem cable"(check at office max/wal-mart/ect.)
and most communication software can be setup to use it.
HTH
Loren

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