Topic Options
Rate This Topic
#244222 - 07/19/10 09:35 AM NEC 2400 PLO Failure
glmariner Offline
Junior Member

Registered: 07/19/10
Posts: 3
Loc: Indiana
We have an NEC2400 system. Lately been getting frequent minor alarms. Alarm display print out states "PLO Failure" on both the standby and active units. Does anyone know what is causing this and what should be done?

Top
Google Equipment Search
#244223 - 07/19/10 12:46 PM Re: NEC 2400 PLO Failure
doghart Online   content
Member
****

Registered: 04/15/07
Posts: 1385
Loc: Denver, CO
I would double check the punch down x-connect from the PRI/T1 card to the Clock card.

D

Top
#244224 - 07/20/10 12:26 AM Re: NEC 2400 PLO Failure
R4+Z Offline
Member

Registered: 02/03/05
Posts: 436
Have you checked the details rather than just the summary? All that hex can help point you to the right card/s

Top
#244225 - 07/20/10 02:33 AM Re: NEC 2400 PLO Failure
glmariner Offline
Junior Member

Registered: 07/19/10
Posts: 3
Loc: Indiana
Will check x-connect. This is the code from one of the failures: 04 00 04 0E 00 00 00. Can you tell me how this code relates to the card position in the stack? Also, some back story info on this, these errors started after Verizons cable got wet and caused lots of outages. Would you suspect this problem is being caused by shorts in the cable or is this likely to be a problem in the our pbx?

Top
#244226 - 07/20/10 03:09 PM Re: NEC 2400 PLO Failure
R4+Z Offline
Member

Registered: 02/03/05
Posts: 436
Sorry

Don't have a manual available at this time and I have never tried to memorise the way of decyphering it. If I can get to the office I will see what I can do. I will get back to this even if you resolve the issue in the meantime as it would be a good exercise anyway. Assuming I can find it in the manual!

Top
#244227 - 07/21/10 02:32 AM Re: NEC 2400 PLO Failure
R4+Z Offline
Member

Registered: 02/03/05
Posts: 436
Ok so two digit hex numbers......

If we number them 1 to 7 from left to right, we are interested in the 4th 5th and 7th groups.

7th =00 which points us to PLO1

4th = scan data 1 and we have to convert it to binary = 00001110

This time bit 0 is on the right and 7 on the left.

b0: Clock status at time of detection
0/1 = STBY/ACT
b1: Circuit card at time of detection
0/1 = PLO synchronizing/PLO Self running or drifting
b2: 0/1 = -/Input clock down
b3, b4:Route of Input clock

b4. b3. DCS INPUT ROUTE. ROUTE OF INPUT CLOCK
0...0..........0..................0
0...1..........1..................1
1...0..........-..................2
1...1..........-..................3

Next another convert to binary for the scan 2 info in hex group 5 but as it 00 the binary will be 00000000

As with the scan 1 binary, left to right

b0: 0/1 = -/Five millisecond Burst Clock down
b1: 0/1 = -/Frame Synchronization from SYNC card is down
b4: 0/1 = -/Internal OSC clock down

So we don't get anything from that!

And that's about as much as I can help, hope it's enough!

Note

Edited as when posted all the spaces that I used to make the table work disappeared so I used full stops instead!

Top
#244228 - 07/22/10 02:56 AM Re: NEC 2400 PLO Failure
glmariner Offline
Junior Member

Registered: 07/19/10
Posts: 3
Loc: Indiana
Thank you, that is an impressive piece of decoding. These errors are occuring along with a "ccs link failure" which appears to be a protocol for reporting load status info between switches. Spoke with Verizon who states that their switch is reporting the "time is slipping" on the connection between our stack and their switch. Their switch then locks our trunks out. My question is, if this is a hardware issue with our stack, what would it be? Is it a clock card or something that handles the timing? Problems like this used to be handled by a service contract which had to be cut due to budget constraints. We are very limited in our tecnical ability with this equipment. It is probably time to bring someone in on a time and materials contract, but I'm hoping to be armed with some info for discussing this with those who hold the purse strings.
Thanks for your help.

Top
#244229 - 07/22/10 03:07 PM Re: NEC 2400 PLO Failure
R4+Z Offline
Member

Registered: 02/03/05
Posts: 436
Just a note,

I got right and left mixed up in the scan 2 section. Binary always counts from right to left as it is a number!

The cancellation of your maintenance contract may be about to bite you back. The card cost may well be thousands and then there is the labour! It may be worth negotiating with a company to give you a discount if you take out a new contract!

Top
#244230 - 01/13/11 04:34 AM Re: NEC 2400 PLO Failure
cabletec1978 Offline
Junior Member

Registered: 01/13/11
Posts: 1
Loc: Canada
Plo in the telephony industry usually stands for Plant Lock Out this usually occurs when there is a cableing short or a short on the equipment from the telecom provider. It also occurs when a telephone does not have a cut off on disconect feature either in the dms programing from the telecom or in the end user key system. In your case I am going to go with the water getting into the plant lines creating a short causing the lines to go into a PLO state.

Top
#244231 - 01/13/11 11:01 AM Re: NEC 2400 PLO Failure
R4+Z Offline
Member

Registered: 02/03/05
Posts: 436
phase loop oscillator

I'll say no more!

Top
#244232 - 01/14/11 11:38 AM Re: NEC 2400 PLO Failure
telephoneguy Offline
Member

Registered: 08/30/05
Posts: 2086
Loc: salinas, CA, USA
Quote:
Originally posted by glmariner:
Will check x-connect. This is the code from one of the failures: 04 00 04 0E 00 00 00. Can you tell me how this code relates to the card position in the stack?
Card position, i.e. which card goes to which pair, is slightly insane.

It should have -- trying to remember here -- a six-digit number. First digit pair is F/W processor, which is half of a cabinet (i.e. 2 shelves, 1 door). Second 1 digit is half of a shelf (0-3), next two are half of a card (00-32), and the next digit is the circuit (1-8) on that half-card.

So 001153 (a made up example)(if I haven't completely screwed this up) would be the lowest left unit (00xxxx), which, when the door is opened, reveals 2 shelves, then the right half of the top shelf (xx1xxx), then the bottom half of the right-most card (xxx15x), then the third light below center (xxxxx3) (or eleventh light down from the top: 8+3=11).

But that can't be right, because I seem to recall that part of the card location was in Hexidecimal.

Yeah, you'll need to call out a technician.

Top
#244233 - 01/14/11 05:54 PM Re: NEC 2400 PLO Failure
R4+Z Offline
Member

Registered: 02/03/05
Posts: 436
telephoneguy

I think he will have worked it out by now... Look at the date of the original post.

Also no hex addressing and you are correct for newer higher density systems but for older systems there was none of the "halves" (sp?)

Top
#244234 - 01/15/11 10:42 AM Re: NEC 2400 PLO Failure
telephoneguy Offline
Member

Registered: 08/30/05
Posts: 2086
Loc: salinas, CA, USA
I first trained on the IPX. I do remember that the IMX and IMS were different... I think I recall an IMS in the lab that split cables for 16-port cards, so some cards were shared across two cables...

Come to think of it, I think that the hex portion came in with certain commands... Georg, the instructor, liked to make it complicated... But it's now fairly easy for me to convert hex to binary, thanks to Georg...

Yeah, sorry, I read your post and thought it was a new thread. My bad.

Top
#244235 - 01/15/11 01:58 PM Re: NEC 2400 PLO Failure
R4+Z Offline
Member

Registered: 02/03/05
Posts: 436
Hex is used in programming in certain areas such as ASYD.

Top
#244236 - 01/15/11 01:58 PM Re: NEC 2400 PLO Failure
R4+Z Offline
Member

Registered: 02/03/05
Posts: 436
Hex is used in programming in certain areas such as ASYD.

Top

Moderator:  DrPbx, ttech 
Equipment Search For Hard to Find Items
Technician Search, enter State or Zip Code
Signup for our Top Telecom Sites Search!
Telephone Installers, Telephone Programmers, Telephone Service Providers, System Installation, Phone System and Equipment Sales Directory.
Shout Box

FREE Download get your DESI Labeling System Software Now!
FREE Download, Get your DESI Labeling System Software Now! Click Here
Make $1000's for less than $10 a month!!!!! Click on a link below to get strated.
INSTALLER REQUESTED IN OH
by mickeyme
09/30/14 11:29 AM
INSTALLER REQUESTED IN Canada
by mickeyme
09/26/14 06:08 PM
INSTALLER REQUESTED IN IL
by mickeyme
09/16/14 12:55 PM
INSTALLER REQUESTED IN IA
by mickeyme
09/12/14 03:24 PM
INSTALLER REQUESTED IN LA
by mickeyme
09/11/14 12:52 PM
Most Recent 5 Post
Inter Tel Axxess- not producing outbound tones
by Mike in NJ
Yesterday at 11:19 PM
trigger phones from external relay
by lansa
Yesterday at 09:06 PM
Amp connector machine for sale
by Arthur P. Bloom
Yesterday at 05:34 PM
Odd Sidekick leakage test result
by hawk82
Yesterday at 08:30 AM
NEAX2400/8500 button mapping issue
by doghart
Yesterday at 08:23 AM
Who's Online
71 registered (medhat eme, Professor Shadow, MrTelComMan, dexman, brokeda, nedicz, Touch Tone Tommy, count vonzipper, Mercenary Roadie, davetel, Cepega, ffej010, Mike in NJ, justbill, phoneguywayne, newtecky, MnDave, Dlr920, podor, Steve G., doghart, KRRath, Ben Ludke, lansa, hawk82, WiringSolutions, Bob3470, Carl Navarro, MooreTel, gelehu, RATHER BE FISHING, ChrisRR, Silversam, metelcom, skip555, JWRacedog, Arthur P. Bloom, BobRobert, njh621, crazyfrog, KENB, Derrick, grich, jimthomson, jeffmoss26, hitechcomm, CallMark, epcompx2, Test-ok, dtmf, jk, JBean3329, tim10, mbhydro, pingable, OBT, jkull2112, 304Tech, baytel, Ironhedz, Curlycord, Mnak, TelephoneSystemsDirect, dlev12, BillFlippen, Yoda, dukane123, Toshiba Bob, hbiss, 2 invisible), 730 Guests and 106 Spiders online.
Key: Admin, Global Mod, Mod
(Views)Popular Topics
Ask the person below you a game. 3800782
Pictures of ugly work II 2880188
Just for Jokester #12 933259
Just for Jokester #13 795468
New Members: Post Here 557750
Pictures of Ugly Work IV 535377
Constructive Criticism 523361
Just for Jokester #14 506404
Pictures of Ugly Work V 366230
Just for Jokester #11 315028
Newest Members
nedicz, lansa, tianyuan2k4, bill462, friedmanllp
46438 Registered Users
Tech Support Line 1.800.766.3425
Over the Phone Tech Support for your Phones and Business Phone Systems
Phone Power Digital Phone Service
Unlimited Calling US/Canada $14.95/mo.
Top Posters (30 Days)
dexman 68
Arthur P. Bloom 52
justbill 51
Rcaman 43
jeffmoss26 37
ChrisRR 34
Derrick 33
RATHER BE FISHING 26
brokeda 26
hitechcomm 24
NEW Belkin NetCam HD+ Wi-Fi Camera
NEW Belkin NetCam HD+ Wi-Fi Camera with Glass Lense WeMo

Contact Us | Equipment | Telephone System Tech Support | Terms of Service

Sundance Communications is not affiliated with any of the above manufacturers.
ęCopyright Sundance Communications 1998-2014
ęCopyright Usedphones.com 1996-2014


Telephone Installers, Telephone Programmers, Telephone Service Providers, System Installation, Phone System and Equipment Sales Directory


Other Links
Shoretel Repair . DESI . Avayaphoneshop Telephone Systems . nortelstore . luxe idesign . phonemanuals.com .