rjd@tiger.UUCP (04/24/87)
>In article <1469@leadsv.UUCP> falsken@leadsv.UUCP (Gary Falsken) writes: > >>I am in need of about 10 cables for my 3B2 system. Where >>is the best place to get them and at what price? > >Best deal I've seen is to build them yourself. Buy a crimping tool >and some 4 pair beans and wire. Check wholesale electronics stores. >Copy the lead arrangement from an existing cable. These cables >are similar to modular 4 pair cables in a Horizon phone system, but >I believe the leads are different. > >-- >Steve Paddock >{ihnp4,allegra,ut-sally}!ut-ngp!melpad!paddock Since I have to make the cables all of the time, I had to write up a wiring diagram to speed these things up. I hope this is helpful, as I got tired of using the break out box and trying to remember my rs232 signals.... 3B2 RS232 modular cable configurations R.J. Davis 3/11/87 Normal 3B2 to terminal or "Null modem" cable - used by OKC datakit to printer cable. (Terminal from terminal to wall outlet. Also used end uses term/print adapter.) for Starlan connections. ----------------- ----------------- |1|2|3|4|5|6|7|8| <- modular end -> |1|2|3|4|5|6|7|8| | | | | | | | | | | | | | | | | | | ----------------- ----------------- ||||| <- cable -> ||||| ----------------- ----------------- | | | | | | | | | | | | | | | | | | |1|2|3|4|5|6|7|8| <- modular end -> |8|7|6|5|4|3|2|1| ----------------- ----------------- 3B2 to 3B2 direct modular 3B2 to datakit that is wired for terminal cable connection. use only. (outgoing into datakit.) ----------------- ----------------- |1|2|3|4|5|6|7|8| <- modular end -> |1|2|3|4|5|6|7|8| | | | | | | | | | | | | | | | | | | ----------------- ----------------- ||||| <- cable -> ||||| ----------------- ----------------- | | | | | | | | | | | | | | | | | | |8|7|4|3|6|5|2|1| <- modular end -> |1|2|5|6|3|4|7|8| ----------------- ----------------- Standard modular to 25-pin D-type connections (the wiring inside of my 8-wire modular to 25-pin D-type rs232 adapter): modular ACU modem Term/Print socket D-type D-type ----------------------------------------------- 1 1 1 2 5 4 3 2 3 4 20 8 5 3 2 6 8 20 7 7 7 8 4 5 Conventions: Back of modular socket D-type 25 pin connector from back within connector Male: 8 7 6 5 4 3 2 1 ------------------- 13 1 | o o o o | o o o o o o o o o o o o o | o o o o | o o o o o o o o o o o o | | 25 14 | | | | | | | | | | | ------ | Female: | | | | 1 13 | ------ | o o o o o o o o o o o o o ------------------- o o o o o o o o o o o o 14 25 ---------------------------------------------------------------------------- Randy Davis 3b2fst!randy AT&T 3B2 Systems Test Engineering AT&T Oklahoma City Works