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

Cisco 3750 PoE Switches

Cisco 3750 PoE Switches

(OP)
Hi,

Hopefully someone has seen this issue before and can help.

We have (more than 1 but will just use 1 as an example here) a PoE 3750 switch, that, from my understanding has a PoE output of 370 Watts. We recently attempted an IPT rollout of Cisco 7942G IP Phones at our London offices. From my knowledge these IPT phones are a Class 2 device and therefore should only draw 7.5 Watts per device. This means 48 devices should be able to be attached to the PoE switch with no problems. When we got to 17 devices and added the 18th, we noted it was getting no power to the switch. Upon checking the switch we noted the PoE light flashing "Amber". To confirm power consumption had been reached we disconnected 1 and hey presto, the other came up. We could only get 17 devices to draw power from the switch. This resulted in a very quick rollback and has left us in a very awkward position.
Please note this is a third partry managed system so I cannot get any command references or any access to the switches.

On top of that, in their wisdom, the second switches enabled for the IPT VLAN were configured on non PoE switches. Marvellous.

Any help or knowledge regarding this would be great.

Thanks

RE: Cisco 3750 PoE Switches

(OP)
It's all good. I think we have found the problem. Would help if the PoE switches had been supplied with the correct PSU .... doh

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