« Here's to you, Johnney | Main | So you're not supposed to fry the hats? »

Technology gives us free time

Wow — how’s this for suckage? Another volunteer was installing a pair of DSL modems at my church to connect the LAN in the main building to a building about 800+ feet away (i.e., one modem at the main building and another at the end of a dormant twisted pair that was laid out to the remote building several years ago):

One thing that was driving me nuts with the DSL installation was the fact that the head DSL modem would not work when the EH end was plugged directly into the Dell switch with a straight through CAT-5 cable. I got it to work by plugging the cable from the Dell switch into a small hub I brought along then pluging the DSL modem into this hub. I thought it strange that I was getting a connection from the Dell switch to my hub using a straight-thru cable. Usually one uses either a crossover cable or the “stscking” connection on the hub to connect a switch to a downstream hub. Unless, thought I, that the Dell Switch is auto-sensing and reverses the input & output connections to accomodate either a straight-thru or a crossover cable.

A trip to the Dell website confirmed that auto-sensing is a “feature” of this switch.

I called Black Box, who made the DSL modems and talked to a tech about this. He said that the modem is auto-sensing, too, so two auto-sensing devices are fighting each other and never figure out which polarity is which. Inserting my “stupid” hub in line, settled the issue in that both the Dell switch and the DSL modem saw a regular hub connection.

The KISS solution is to simply leave a hub in the line.

I’m glad it wasn’t me!


TrackBack URL for this entry:

Post a comment

(If you haven't left a comment here before, you may need to be approved by the site owner before your comment will appear. Until then, it won't appear on the entry. Thanks for waiting.)


This page contains a single entry from the blog posted on December 13, 2004 1:41 PM.

The previous post in this blog was Here's to you, Johnney.

The next post in this blog is So you're not supposed to fry the hats?.

Many more can be found on the main index page or by looking through the archives.

Powered by
Movable Type 3.34