Contact US

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.

Students Click Here

NEC NEAX2400 RGU Alarm Issue

NEC NEAX2400 RGU Alarm Issue

NEC NEAX2400 RGU Alarm Issue

New to the forum. I want to preface this post by saying that I don't work that much with NEC, I work primarily on Mitel products and I inherited a client that has three NEAX 2400s (the rest of their systems are Mitel). For the past 4 1/2 years, I've been able to muddle my way through fixing the mounting and inevitable issues that have arisen with the 2400.

I now have an issue that I haven't been able to resolve.

The RGU Alarm LED was lit on the SPA-55-UA card and as far as I could tell from the several random extensions I tested, none of the extensions (analog) on that top shelf were generating a ring tone (I tested with my butt set directly to the 66 block).

I have quite a few power circuit cards for the 2400 that appear to have the same specifications, but, I don't have one with the exact SPA-55-UA model number, so, I replaced it with a new PA-PW54-A card and... no change.

There are 704 analog extensions and none of the other power circuit cards are having this issue,

I would really appreciate some guidance here from the NEC pros in this community.

Thanks in advance.

RE: NEC NEAX2400 RGU Alarm Issue

The PW-55 is the primary PSU. The PW-54 is the redundant/backup PSW. If you have both in the same PIM, then shut off the PW-55. The PW-54 should take over without any interruption in service. Most likely a fuse on the card, however they do have a microcomputer chip on board to provide intelligence to the CPU's. There is a reset button on the card. Pressing that should reset the chip. If you have full power redundancy (2 power cards per PIM), then shut down a good working PW-55, let the PW-54 take over in that PIM. Then swap it with the bad one. See if it comes on with the same error. In that case you may have a short in a cable run, or some device plugged in that is not a SLT device.

RE: NEC NEAX2400 RGU Alarm Issue

I should clarify.

There are not two cards per PIM in this system. There's only one.

If you're telling me that the 54 is a backup, then I will replace it with a 55, but, first I'll frog the cards as you suggest.

I'll follow up.

Thanks for your help.

RE: NEC NEAX2400 RGU Alarm Issue

I used one of the 55s I had and it fired right up.

It's been operating for two days without issue.

Thanks for your help.

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! Already a Member? Login

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