Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!haven!umbc3!digennar From: digennar@umbc3.UMBC.EDU (Mr. Jerry DiGennaro) Newsgroups: comp.dcom.lans Subject: Re: Lattisnet/Ethernet over Twisted Pai Keywords: Ethernet, LattisNet, 802.3, Synoptics Message-ID: <1697@umbc3.UMBC.EDU> Date: 25 Feb 89 05:40:03 GMT References: <98@cs.columbia.edu> <114400001@uxa.cso.uiuc.edu> <1689@umbc3.UMBC.EDU> <15364@cos.com> Reply-To: digennar@umbc3.umbc.edu.UMBC.EDU (Mr. Jerry DiGennaro) Organization: University of Maryland, Baltimore County Lines: 37 In article <15364@cos.com> howard@cos.com (Howard C. Berkowitz) writes: >In article <1689@umbc3.UMBC.EDU>, digennar@umbc3.UMBC.EDU (Mr. Jerry DiGennaro) writes: >> . The only major problems has been with the initial >> wiring. Phone people think any four wires will make a four wire >> circuit. LattisNet needs a continous twisted pair for the receiving >> side and a continous twisted pair for the transmit side. Continous >> means from the back of the PC/computer/host all the way back to the >> LattisNet concentrator. > > >I wonder if you could clarify if your problems with paired wire >are due to a loss of pair sense, or are you saying that you have had >problems with wire closet punchdowns? > >In a pair sense problem, some interpretation of installation practice >causes two wires which start out in one pair to be assigned to two >different pairs. This is the problem I was mentioning. Synoptics (manufacturers of the LattisNet product) recommends AT&T PDS wiring to include 66 blocks. One does not need solid continuous unshielded twisted pairs running end to end. There is also a recommendation for patch panels to make changes easier. One wires from the workstation to the 66 block in the closet. From the 66 block you go to a patch panel (say with 25 pair cable), from the patch panel, jumpper cables with RJ-45s on them take you to the concentrator. Also the concentrators are linked via fiber optic cables. The maximum length of the UTP wire is some 360 feet or so. (Check the specs for the exact value) Sorry for the confusion with my poor terminology. -- Jerry DiGennaro digennar@umbc3.umbc.edu (301) 266-4150