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- Newsgroups: comp.sys.att
- Path: sparky!uunet!cs.utexas.edu!uwm.edu!linac!att!cbnews!adh
- From: adh@cbnews.cb.att.com (andrew.d.hay)
- Subject: Re: Longest possible 3B2 serial runs?
- Organization: AT&T
- Distribution: na
- Date: Fri, 20 Nov 1992 12:07:29 GMT
- Message-ID: <1992Nov20.120729.24105@cbnews.cb.att.com>
- References: <1992Nov19.025755.5214@sci.ccny.cuny.edu>
- Lines: 29
-
- In article <1992Nov19.025755.5214@sci.ccny.cuny.edu> jeffrey@sci.sci.ccny.cuny.edu (Jeffrey L Bromberger) writes:
- "I'm interested in figuring out how long a run I can make from my 3B2.
- "Hopefully, I can pull about 75 feet of cable from a terminal to the
- "main machine - can the 3B2 drive a line this long? Our old VAX 780
- "handles lines over 13 stories long :-)
-
- yes, even at 19200. if you use lo-cap cable, you can probably triple
- this [at least].
-
- "BTW: does anyone out there have a source for CHEAP RJ-45 cables
- "that'll work on a 3B2? I don't have access to the crimp connector, so
- "making my own is effectively out of the question. How about those
- "terminal adapters? I foud the "make 'em yourself" variety for about
- "$5 each. Anybody know of a more reasonable price? Of course, buying
- "from AT&T is probably insane.
-
- dunno [we made our own], but i do know this: most rj-45 cables are
- wired 1-1, 2-2, etc. the infamous at&t black rj-45 cables are wired
- 1-8, 2-7, etc. we made ours by taking flat cable and giving it a
- half-twist...
- [minor flame -- why didn't They pair signals on the rj-45 connector
- symmetrically, so that straight through would be 'straight through',
- but half-twist would be 'null modem'?]
-
- --
- +--------------------------------------------------------------+
- Andrew Hay | one step beyond the outer limits of |
- a_d_hay@att.com | the twilight zone in the darkened room |
- +--------------------------------------------------------------+
-