INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Can ethernet travel from fiber to copper back to fiber then back to copper?

Can ethernet travel from fiber to copper back to fiber then back to copper?

Can ethernet travel from fiber to copper back to fiber then back to copper?

(OP)
Dedicated Comcast fiber -> Cat5 -> fiber -> Cat5. I'm using 2 fiber/copper 1000 base media converters and 2 gigbit switches. I can't get a connetion on the other side. Cables are good. Dedicated fiber -> Cat5 is good. Any ideas?

RE: Can ethernet travel from fiber to copper back to fiber then back to copper?

First idea, use a laptop at each step so you know which leg is borked.

The fiber converters I have used can be set to always see link, or to see the link on the copper, choose wisely.

Unlike copper fiber runs at only one speed and only one duplex. Nothing can be set to Auto. If some stuff HAS to be auto, everything else must half duplex. You cannot mix Auto and full duplex.

I tried to remain child-like, all I achieved was childish.

Tsar of all the Rushers

RE: Can ethernet travel from fiber to copper back to fiber then back to copper?

Be sure the fibers are:
Tx->Rx
Rx->Tx

Like jimbopalmer most of the other fiber problems I have had involve link speed/duplex settings. One lot of media converters I used only worked at 100/half and the switches they were connected to had to be set to that manually.

What converters and switches are you using?

RE: Can ethernet travel from fiber to copper back to fiber then back to copper?

In addition to the TX/RX orientation of the fiber connections, the back-to-back copper could be a problem too, if the media converters are not auto MDI/MDIX on the copper side. If that is the case you need a crossover Ethernet cable between the media converters. If you are not sure about features/options of the media converter, contact the manufacturer for clarification.

....JIM....

RE: Can ethernet travel from fiber to copper back to fiber then back to copper?

I have set up copper to fibre adaptor, through to adaptor back to copper, then into a switch, back out to fiber back to copper to switch and then branch to LAN from there.

Jon

RE: Can ethernet travel from fiber to copper back to fiber then back to copper?

I suggest testing levels at every point to make sure clean.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!

Resources

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close