bin@primate.wisc.edu (Brain in Neutral) (08/18/90)
What's the maximum end-to-end distance a PhoneNet network can be, and what factors does this length depend on? Paul DuBois dubois@primate.wisc.edu
awessels@walt.cc.utexas.edu (Allen Wessels) (08/18/90)
In article <2949@uakari.primate.wisc.edu> bin@primate.wisc.edu (Brain in Neutral) writes: >What's the maximum end-to-end distance a PhoneNet network can be, >and what factors does this length depend on? (This is from memory.) The total bus length limit is around 3000 feet, but this assumes a particular wire gauge that I don't recall. You might just go buy one connector kit and read their manual. It is a pretty good intro to Mac networking and PhoneNet connector use. One thing I would definitely recommend is that you know exactly where your wiring goes when you set your network up. Some older buildings are not wired so that you can use existing phone cabling to connect the network. You can extended the total length of your network with repeaters and starcontrollers. Lots of things cut down on the total length of the network. Using LocalTalk connectors, mixing wire types, extended runs with modular wire (the kind you use to hook the phone to the wall jack.) - Allen
msm@energetic.com (Michael S. Maiten) (08/19/90)
> Date: 18 Aug 90 03:46:48 GMT > From: bin@uakari.primate.wisc.edu (Brain in Neutral) > Subject: How long can a PhoneNet network be? > To: info-appletalk@andrew.cmu.edu > > What's the maximum end-to-end distance a PhoneNet network can be, > and what factors does this length depend on? > > Paul DuBois > dubois@primate.wisc.edu Funny you should ask; I just looked this one up yesterday! (However, I don't have the manual in front of me, so this is from memory)... For a daisy chain phonenet network, the maximum length is 1800 feet with 24 nodes. If you use a backbone net, then the distance is the same except that you must reduce the total length by 4 feet for every 1 foot between the backbone jack and the phonenet box on the mac. If you use wire (for the backbone) smaller than the normal gauge then the distance is reduced. [This is from recent experience]: If you have a phonenet network that is too long, then you start getting intermittent behaviour. The chooser may take a long time to come up after selecting it, and then you may not see all the devices you might expect. If you leave the chooser up, you may see devices (ie; set it to laserwriters) come and go periodically! The solution in this particular case was to reorganize the daisy chain phonenet to remove unnecessary length; the problems then dissapeared. ------------------------------------------------------------------------------ Michael S. Maiten Internet: msm@energetic.com Energetic Systems UUCP: ensys!msm Telephone: +1 415 967-5538 (...!sun!bridge2!ensys!msm)
ddaniel@lindy.stanford.edu (D. Daniel Sternbergh) (08/19/90)
In article <36336@ut-emx.UUCP> awessels@walt.cc.utexas.edu (Allen Wessels) writes: >In article <2949@uakari.primate.wisc.edu> bin@primate.wisc.edu (Brain in Neutral) writes: >>What's the maximum end-to-end distance a PhoneNet network can be, >>and what factors does this length depend on? > >(This is from memory.) The total bus length limit is around 3000 feet, but >this assumes a particular wire gauge that I don't recall. You might just go >buy one connector kit and read their manual. It is a pretty good intro to >Mac networking and PhoneNet connector use. The Farallon PhoneNET Connector User's Guide is one of the finest and most useful pieces of technical writing I've ever seen, bar none. Their "conservative guidelines" for normal LocalTalk speeds are as follows: Topology 22 gauge 24 gauge 26 gauge Max # Nodes daisy chain n/a n/a 1800 ft 24 backbone 4500 ft 3000 ft 1800 ft 48 3-branch passive star 1500 ft 1000 ft 600 ft 16 (each branch) 4-branch passive star 1125 ft 750 ft 450 ft 12 (each branch)
Beattie@SYSTEM-M.PHX.BULL.COM ("Art Beattie {AC602 862-4783}") (08/19/90)
>In article <2949@uakari.primate.wisc.edu> bin@primate.wisc.edu (Brain in Neutral) writes: >>What's the maximum end-to-end distance a PhoneNet network can be, >>and what factors does this length depend on? As has been mentioned there are 2 basic styles of wiring; backbone and daisy-chain. This plays an important part in how far you can go with the wiring. By the way, all this is covered in the manual you get from Farallon with a StarController; a good reference. Backbone: O----------O----------O----------O----------O----------O----------O | | | | | | | | | | | | | | | | | | | | | P P P P P P P The "O"s are RJ11 telco wall jacks. The wiring between them is one UNBROKEN normal telephone hookup cable (2pair, only one pair is used. The other pair is handy if the first pair used is broken or shorted). The "P"s are the PhoneNet connectors from Farallon or TurboNet(ST) connectors from Nuvotech. Daisy chain: _____ _____ _____ _____ _____ _____ _____ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | P P P P P P P P Each PhoneNet connecter can take 2 line cord connections. Each connection introduces a small break in the netowrk and thus a discontinuity for the signal. This reduces the effective distance the signal can travel. That is one reason why the backbone wiring is prefered as long as the wire is installed without being broken. The installer's tool can be set up to punch down without cutting the wire. And it is easier to use RJ11 wall jacks which have the punch-down style connections internally rather than screws. It is also important for the installers to realize that the LocalTalk signals are of a higher frequency than what normal audio presents. Our installers used short cut technicques which will not work here. If a wire breaks, they used to wrap the wire around a punch down connection. This type of connection will not support the frequencies of LocalTalk. If it is necessary to reconnect broken wirings without stringing a new one, the following is the best way we have found to work. You first remove the red and green wires (we don't mix voice and Localtalk on the same cable). Then carefully take the yellow and black wires from the connector and punch them onto the connectors that the red/green wires came from without breaking them. ___________________________ | | | | zzz zzz | | | Telco zzz zzz ______ | Continuation of ______________| |_______| | |_________________ _______________ ________| | __________________ Cable | | |____| | Telco Cable zzz zzz | | | zzz zzz | | | | | |_________________________| |_________________________| RJ11 Wall Jack Hope this helps.
CHARLES%uhavax.decnet@UHASUN.HARTFORD.EDU (08/20/90)
>To: info-appletalk@andrew.cmu.edu > >What's the maximum end-to-end distance a PhoneNet network can be, >and what factors does this length depend on? > >Paul DuBois >dubois@primate.wisc.edu depending on the topology these are the maximum end-to-end distances wire gauge (ft) topology 22 24 26 daisy chain - - 600 backbone 1500 1000 600 3 branch pasive star 500 333 200 4 branch pasive star 375 250 150 this info comes from the Phonenet connector users guide hope this helps chuck richards crichard@uhasun.hartford.edu charles@hartford.bitnet