Phone Systems

Previous Thread
Next Thread
Print Thread
Rate Thread
M7310 phones dying frequently
#129016 07/17/06 08:40 PM
Joined: Jul 2006
Posts: 2
lwjer Offline OP
Member
OP Offline
Member
Joined: Jul 2006
Posts: 2
Hi All, I would really appreciate any advice on this issue:

We recently opened a new office about 700 feet from our old office and connected our phones in our new office to our nortel system at our old office via underground cat3 cable. Almost immediately, phones at the new office started dying - the display will dissapear and the phone will never work again, no matter what line it is connected to. When the phone that died is replaced with a new phone it works fine on the same line.

To date we've had about 12-15 phones die. The phones at the old office do not suffer from this problem even though they are all connected to the same system.

Our system:
MICS 4.x
Voicemail NAM
ACD NAM (cinphony)
4 POTS lines
1 T1 line
Combo Fiber/Clock card

I would greatly appreciate any ideas/advice. Our installer hasn't come up with any solutions so far.

(ps, we've been getting "ALARM 75" on the main set periodically but I don't think it is related)

Thanks!
Jer


Jeremy Hill
Liquid Web
Nortel Equipment and Telephones
Re: M7310 phones dying frequently
#129017 07/17/06 08:55 PM
Joined: Jun 2005
Posts: 2,256
Member
Offline
Member
Joined: Jun 2005
Posts: 2,256
Hi lwjer.

Welcome to the board. welcome

Please complete your profile so we will know who it is we are helping smile

The ones you are replacing, are you replacing them with the new T series phones?


Richard
AVAYA-NORTEL-SAMSUNG-PANASONIC-MITEL
www.acceleratedtelecom.com
Re: M7310 phones dying frequently
#129018 07/17/06 11:22 PM
Joined: Mar 2001
Posts: 3,869
Member
****
Offline
Member
****
Joined: Mar 2001
Posts: 3,869
When you say underground Cat. 3 cable, do you mean gopher proof direct burial cable or what?

22, 24, or 26 gage cable?

Do you have all unused pairs grounded on each side?

How far in total from ksu to new phones, not just from the building?

If you were using 26 gage cable going a real 1000 feet I would look at replacing the cable. Who told you what cable to buy, your vendor? Someone in the office? A supply house?

I assume that the display dies AND the phone cannot be used for a call either.


THE Bracha, old blond specialist in Rube Goldberg solutions.
Re: M7310 phones dying frequently
#129019 07/18/06 04:09 AM
Joined: Aug 2003
Posts: 5,120
Moderator-Vertical, Vodavi
*****
Offline
Moderator-Vertical, Vodavi
*****
Joined: Aug 2003
Posts: 5,120
Do you have any lightning protection?

Re: M7310 phones dying frequently
#129020 07/18/06 03:07 PM
Joined: Jul 2006
Posts: 2
lwjer Offline OP
Member
OP Offline
Member
Joined: Jul 2006
Posts: 2
Hi,

We are replacing the dead phones (they die completely) with the same model M7310 (not t series).

Underground cable - it is 2 x 25 pair cable bundles run though a 2 inch PVC pipe. The guage looks to be 24.

I don't think the unused pairs are grounded, they are just punched down.

It is probably up to 1000 feet from ksu to phones.

Lightning protection - the ksu is protected by our central building UPS. Other than this there is no other protection.

Thanks!


Jeremy Hill
Liquid Web
Re: M7310 phones dying frequently
#129021 07/18/06 03:37 PM
Joined: Oct 2005
Posts: 4,681
Member
Offline
Member
Joined: Oct 2005
Posts: 4,681
You must have lightning protection on both ends of the cable even if it is underground. And previously noted all unused pairs should grounded.

1000 feet is the extreme limit for any M or T series phone on 24ga wire. You can increase the distance by doubling up on the pairs.


Marv CCNA, CTUB
TeleMarv Services
Providing telecommunication solutions in Ottawa Canada since 1990
http://www.telemarv.ca
Specializing in Nortel Norstar, BCM and Allworx VoIP Servers
Re: M7310 phones dying frequently
#129022 07/18/06 06:47 PM
Joined: Jan 2004
Posts: 6,646
Moderator-Nisuko-Tie, General
*****
Offline
Moderator-Nisuko-Tie, General
*****
Joined: Jan 2004
Posts: 6,646
should have primary (gas tube ) and secondary lightning protectin that is rated for digital sets .

cable should be bnded an grounded .

get somebody in who understnads outside plant to straighten out for you .


Skip
------------------------------------

Serving SW and West central Fl since 1984
Re: M7310 phones dying frequently
#129023 07/19/06 12:06 AM
Joined: Mar 2001
Posts: 3,869
Member
****
Offline
Member
****
Joined: Mar 2001
Posts: 3,869
You have 50 pairs, how many phones? As telemarv suggested, using two or even three pairs for each phone will give you more power, remember the power to run the phone has to go that far on 24 gage wire as well as the data. More copper = more power.

I don't think anyone who wasn't an old timer would realize the scope of the job. People who just read a book and take a test don't get this information and don't offer it to you.

As everyone said, get an expert. If there is a Volt contractor in your area, they could do it. You could talk to some of the techs at the local AT&T or Verizon or whoever central office and see if they would come over off hours and do this.

My suggestion would be to use as many pairs as you can, ground the rest, and have solid earth grounds on both ends. Everyone above is giving you solid advice for free and it is worth much more than that.

Print this out and give it to Volt or a tech working out the central office or an independent.


THE Bracha, old blond specialist in Rube Goldberg solutions.
Re: M7310 phones dying frequently
#129024 07/19/06 05:52 AM
Joined: Aug 2004
Posts: 251
Member
Offline
Member
Joined: Aug 2004
Posts: 251
Ditto what Skip said. You need lightning protectors for digital phones. We use ONEAC 6DP protectors on all digital sets located offsite of the KSU.

Re: M7310 phones dying frequently
#129025 07/19/06 08:22 AM
Joined: May 2003
Posts: 2,267
Member
Offline
Member
Joined: May 2003
Posts: 2,267
The Norstar series phones have a main "brain" I/C chip that is pariculary sensitive to power surges. Without adequate lightning protection at both ends of your underground cable, you will continue to lose phones on a very regular basis.
I would love to know who installed the cable without it....


Moderated by  MooreTel, NTlayoff, Z-man 

Link Copied to Clipboard
Forum Search
Most Recent 5 Post
You don't know Jack!
by Professor Shadow - 07/12/20 02:57 AM
SL2100 night mode switching
by teleco - 07/11/20 04:19 PM
Suttle Apparatus Acquisition.
by dexman - 07/11/20 03:59 AM
Headset in-use relay
by SST - 07/08/20 06:33 PM
Partner ACS AA
by mtncomm1 - 07/08/20 04:18 PM
Who's Online Now
26 members (Mercenary Roadie, justbill, Carl Navarro, RATHER BE FISHING, Curlycord, nonameyet, LoonCreek, Bob3470, Professor Shadow, Jared R, Ruben, newtecky, nortelvoip, Tip&Ring, Yoda, Arthur P. Bloom, hitechcomm, pvj, Touch Tone Tommy, hbiss, RM SYSTEMS, John807, BobRobert, JBean3329, metelcom, teleco), 239 guests, and 42 robots.
Key: Admin, Global Mod, Mod
Popular Topics (Views)
Forum Statistics
Forums94
Topics93,809
Posts636,338
Members49,310
Most Online5,661
May 23rd, 2018
Today's Birthdays
bobo1960, HiVolt, KarlaS, mitrany2, Siemenshicom, Soonerman90
Newest Members
StevCom, DaleG, jlspeck, Real Estating, ForestHillChurch
49310 Registered Users
Get Tech Support Now! Click the banner below
Get Tech Support Now!
EMP & Lightning Home Surge Protection
EMP - Click Here!
Top Posters (30 Days)
dexman 22
dans 10
Bluewater Sailing
https://www.patreon.com/bePatron?u=5256033
EMP Shield for Commercial - Home & Vehicle
Use Coupon code SAVE - Click Here!
Servpro Ventura 24-Hour Emergency Service
Free Estimates call us now 24Hours
Contact Us | Telephone System Tech Support | Terms of Service

Sundance Communications is not affiliated with any of the above manufacturers.
©Copyright Sundance Communications 1998-2020
Trusted Partners