lee@srs.UUCP (Lee Hasiuk) (05/29/87)
We are moving to a new building, where we are required to use 'Plenum' type cable for all runs which go through the suspended ceiling and not in metal conduit. Since our current Ethernet cable is PVC jacketed and not for plenum use, I was thinking of replacing it with about 500' of Cheapernet cable. I have a few questions which I hope someone out there can answer (by mail, of course). 1) I would like to use Belden type 89907 cable. Has anyone had experience with this wire (good or bad)? Does anyone have a favorite Cheapernet cable with a source that has it in stock? If they have connectors as well, that would be lovely. Inmac, for example, does not! 2) The O.D. of this cable is something like .182, whereas most RG-58/U is .250. Can this work with ordinary BNC connectors, or do I have to special order Belden's suggestion of AMP 6-227079-7? Does anyone know of a company who stocks this connector or any other Cheapernet compatible BNC? 3) Will Cheapernet cable work with the old style 3Com 3C100 (black brick) transcievers. Of course, I will have to use N to BNC adapters, but do I need to use a special type? Any other warnings or suggestions on the use of thin Ethernet cable will be greatly appreciated. Lee Hasiuk seismo!rochester!srs!lee (716) 266-9035
gnu@hoptoad.UUCP (06/04/87)
In article <234@srs.UUCP>, lee@srs.UUCP (Lee Hasiuk) writes: > 3) Will Cheapernet cable work with the old style 3Com 3C100 (black brick) > transcievers. Of course, I will have to use N to BNC adapters, but > do I need to use a special type? Yes, it works fine; I use a brick to connect Hoptoad to Polliwog (our sun-3/50). Be sure to buy the N to BNC connectors from an electrical supply house rather than from an "ethernet dealer", they will cost you $1.50 rather than $30 apiece. Ditto the terminating resistors, which handily can be bought mounted on BNC connectors... Cheapernet is certainly one of the better networking ideas. I've heard that cheapernet is what Xerox's Ethernet was like before DEC got on the bandwagon and bulletproofed all the specs. Of course, nobody shoots bullets at Ethernets... (posted from the only house on the block with a LAN -- I think!) -- Copyright 1987 John Gilmore; you may redistribute only if your recipients may. (This is an effort to bend Stargate to work with Usenet, not against it.) {sun,ptsfa,lll-crg,ihnp4,ucbvax}!hoptoad!gnu gnu@ingres.berkeley.edu
mclean@bnrmtv.UUCP (06/05/87)
In article <234@srs.UUCP>, lee@srs.UUCP (Lee Hasiuk) writes: > We are moving to a new building, where we are required to use 'Plenum' type > cable for all runs which go through the suspended ceiling and not in metal > conduit. As I recall, there are two alternatives (depending on your local codes): 1) Use an open plenum return for heating and cooling but require such wiring to be in conduit. 2) Use a closed duct return for heating and cooling which allows open wiring of some cables, particularly twisted pair and coax. Heavy communications environments are typically cheaper to run closed air ducts than wire conduit. Rick McLean {amdahl | hplabs}!bnrmtv!mclean