Re: Another request for Help for Home LAN Cabling

Re: Another request for Help for Home LAN Cabling


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Posted by Dmitri Abaimov, RCDD on January 05, 19100 at 09:01:51:

In Reply to: Another request for Help for Home LAN Cabling posted by David Roise on January 05, 19100 at 01:36:03:

Hello, Dave
It seems like you've found the problem yourself. I'm not really familiar with this particular model of UNICOM jacks, but anyway, to terminate stranded cable onto ANY jack is a pretty tricky task. Although every vendor claims that their IDC connector (that's iside a jack) holds those small wires tight to prevent breaking circuit, in real life situation when you lay the cable, there are lots of small movements occures that swing the pairs and connection gets lost. Even experienced istallers don't like to terminate jacks onto stranded cables because. So, try to buy 50 ft pieceof solid CAT5 cable, if you can. You may use the same jacks again. If you disassemble everything carefully, jacks can be used up to 3 or maybe more times. If you can't buy new cable, let's use those RJ plugs that you cut away. Strip the cable pieces (if any) up to bare conductors, get both ends of your line close to each other and test every conductor's continuity with ohmmeter.
Of course there is always a chance that you did a mistake when making T568B pinout scheme. Check it again. Just in case.
EMI from 120V cables nearby is very unlikely cause of failure. The equipment powered should be really hevy load to create such an effect.
Again, I believe, you've got continuity problems.
With best regards,
Good luck,
Dmitri.
P.S. Just in case you'll need a reference for making proper T568B connection - below is a link to the page, containing what's needed.
: I'm having a similar problem with a 2-computer LAN that I'm trying to set up between my wife's iMac (upstairs) and my PC desktop (downstairs). I bought a 50 foot stranded cat 5 patch cable, cut off the ends, ran it through the floor to my desktop, and attached RJ45 (T568B-wired) jacks to each end. When I connect my desktop to the downstairs jack through a Netgear NIC <--> patch cord <--> Netgear 104 (10baseT) hub <--> patch cord, and connect the iMac through its ethernet port and a patch cord to the upstairs jack, I get a green light on the hub but am unable to PING either machine successfully. (There are brief green lights flashing on the Rx LED as the machines ping.) If I carry the iMac downstairs and connect it to the hub directly through a short patch cord, however, everything works fine.

: I figure that the problem must be either that the connections I have made to the jacks are not good, that the jacks I have used (Unicom SMM-U81B) are not supposed to be used with stranded UTP cable, or that the long cable running between floors passes too close to my 120V romex wiring and is somehow picking up interference.

: Any suggestions??? I'm at my wit's end and am about to chuck the whole thing.

: Thanks in advance. Dave




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