Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Perfect crosstalk?

Posted on 2013-01-03
3
Medium Priority
?
332 Views
Last Modified: 2013-01-27
Weekend fun:

(I know it's not best practice, don't tell me... :) )
Setup: only one cat5 (solid core, around 50-60m run) copper to a classroom, need access for lecturer PC and wireless AP. Instead of small managed switch, I went with a passive splitter.
AP receives 24V POE on far end after splitter.
AP immediately falls back to and stays on 10meg connection, error counter on 0 after days, appears to be working perfectly, wireless clients happy.
Fun part: sometimes the MAC of the AP appears on the 'wifi vlan' port (good thing), and also on the 'student vlan' port where the split cable PC is.
Double-checked, vlans are not bridged together in the area.

So: what's your guess? Perfect, full-frame crosstalk on the splitted cable, or the otherwise perfectly reliable 3Com 4400 box started bleeding between vlans, or other?

Cheers,
Tamas
0
Comment
Question by:TimotiSt
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 47

Assisted Solution

by:Craig Beck
Craig Beck earned 1200 total points
ID: 38747443
Crosstalk wouldn't make a MAC address appear on a different port.  This would only be caused by a bridge or loop.

Do any of your student clients have wired and wireless connections back to the same switch?  If so, make sure none of them have inadvertently bridged their NICs.

Also, make sure your STP is working properly.
0
 
LVL 17

Accepted Solution

by:
TimotiSt earned 0 total points
ID: 38804935
Okay, got this one:
The Cat5 run in the wall is patched up somewhere, where it has strange cable shorts. Pins 1,2,3 and 6 are not shorted to each other, but they are to random other pins, so it's a mess...
Couldn't originally debug with my cheap cable tester...
Anyways, it kinda works with only one 100Meg connection, without a passive splitter. But I'll definitely need a new cable run...

Tamas
0
 
LVL 17

Author Closing Comment

by:TimotiSt
ID: 38823762
Managed to debug the cable.
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Arrow Electronics was searching for a KVM  (Keyboard/Video/Mouse) switch that could display on one single monitor the current status of all units being tested on the rack.
This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
In response to a need for security and privacy, and to continue fostering an environment members can turn to for support, solutions, and education, Experts Exchange has created anonymous question capabilities. This new feature is available to our Pr…
In a question here at Experts Exchange (https://www.experts-exchange.com/questions/29062564/Adobe-acrobat-reader-DC.html), a member asked how to create a signature in Adobe Acrobat Reader DC (the free Reader product, not the paid, full Acrobat produ…

609 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question