X-Received: by 10.43.69.210 with SMTP id yd18mr11596838icb.10.1394392090207; Sun, 09 Mar 2014 12:08:10 -0700 (PDT) Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!usenet.blueworldhosting.com!feeder01.blueworldhosting.com!peer01.iad.highwinds-media.com!news.highwinds-media.com!feed-me.highwinds-media.com!l13no4437440iga.0!news-out.google.com!du2ni2254qab.0!nntp.google.com!Xl.tags.giganews.com!border1.nntp.dca.giganews.com!nntp.giganews.com!local2.nntp.dca.giganews.com!nntp.posted.gcicommunications!news.posted.gcicommunications.POSTED!not-for-mail NNTP-Posting-Date: Sun, 09 Mar 2014 14:08:08 -0500 Newsgroups: alt.os.linux,alt.os.linux.ubuntu,comp.os.linux.networking Subject: Re: How to set up a spare Linksys WRT54Gv2 as a wired access point network extender References: <79349$531ada84$43da7656$10059@nntpswitch.blueworldhosting.com> <531B1133.3030405@djph.net> <46871$531b684c$43da7656$13519@nntpswitch.blueworldhosting.com> <1nsnh9t7sjbov63ns8iceejos9b4mvc7jj@4ax.com> <87mwgzoimk.fld@apaflo.com> From: floyd@apaflo.com (Floyd L. Davidson) Organization: __________ Date: Sun, 09 Mar 2014 11:07:59 -0800 Message-ID: <87eh2bnqb4.fld@apaflo.com> User-Agent: gnus 5.10.6/XEmacs 21.4.15/Linux 2.6.19 Cancel-Lock: sha1:STzAn7+4IgXcfIvhrU9pwQCo6Gs= MIME-Version: 1.0 Lines: 59 X-Usenet-Provider: http://www.giganews.com NNTP-Posting-Host: 24.237.124.187 X-Trace: sv3-YdpwVXNSq2UC+LsOMXt9d65YaQrR/J6OuBiqlqYFhoas9Q3hkAcycAD8xUdZnukydCQkZrj6W9bFBlu!bYcaZbSQSrjL3q4F+xhhje5pgYL4fry2QoAso8PzpilOhwD/P/qUEZbu7oR9EGfEuHhpRxAH X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 X-Original-Bytes: 3825 Content-Type: text/plain; charset=us-ascii X-Received-Bytes: 4130 X-Received-Body-CRC: 2181520648 Xref: csiph.com comp.os.linux.networking:2811 DecadentLinuxUserNumeroUno wrote: >On Sat, 08 Mar 2014 23:56:19 -0900, floyd@apaflo.com (Floyd L. Davidson) >Gave us: > >> Not in a home >>environment with only minor potential for crosstalk. >> > > The crosstalk takes place at that connector. Crosstalk takes place all along a cable. "Near end crosstalk" is certainly the most significant though, but that is due to higher signal levels on the transmit pairs and lower signal levels on the receive pairs than at other points along the cable. Certainly incorrectly done connectors would add to that. >The amount of >non-twisted wire in the termination itself even matters. There is a >spec for assemblers, and arriving at a properly constructed cat 6 >termination is not merely stuffing them in and crimping. There should not be more than 13mm of untwisted wire at the connector. > After the pairs are matched up to the right pins, the length of the >'combed straight' set of wires *must* be trimmed back such that it >barely makes it all the way into the connector. > > Otherwise, it will not perform out to full spec. > > The best connectorization for cat6 includes a SHIELDED termination >shroud and shielded cable. Shielded Twisted Pair has it's uses, but generally speaking is not better than UTP. The length that can be used is reduced, due to the added capacitance. STP is used in more severe environments. For example, in a telecommunications center where there are cable racks with literally thousands of pair of wires, long runs between different rows of racks will uses shielded pairs, while short runs within the same row of racks will use unshielded pairs. That is partialy due to the way grounding systems are designed, and if for some reason the ground at one end of a row is provided differently tha the ground at the other end, then STP would be used instead of UTP. > But yeah... it will not halt a connection at someone's home. It just >will not pass the data at the full rate. Essentially un-noticed since >that is not where the bottleneck is. That is not correct. The point is that the any crosstalk would be so rare as to be insignificant. -- Floyd L. Davidson http://www.apaflo.com/ Ukpeagvik (Barrow, Alaska) floyd@apaflo.com