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: 1365
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 Online   content
Member

Registered: 02/03/05
Posts: 433
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 Online   content
Member

Registered: 02/03/05
Posts: 433
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 Online   content
Member

Registered: 02/03/05
Posts: 433
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 Online   content
Member

Registered: 02/03/05
Posts: 433
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 Online   content
Member

Registered: 02/03/05
Posts: 433
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: 2077
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 Online   content
Member

Registered: 02/03/05
Posts: 433
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: 2077
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 Online   content
Member

Registered: 02/03/05
Posts: 433
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 Online   content
Member

Registered: 02/03/05
Posts: 433
Hex is used in programming in certain areas such as ASYD.

Top

Moderator:  DrPbx, ttech 
Usedphones Equipment Search
Technician Search, enter State or Zip Code
Signup for our Top Telecom Sites Search!
Shout Box

FREE Download get your DESI Labeling System Software Now!
FREE Download, Get your DESI Labeling System Software Now! Click Here
Paid Leads - Guaranteed money in your pocket!
INSTALLER REQUESTED IN CA
by mickeyme
07/23/14 02:49 PM
INSTALLER REQUESTED IN CA
by mickeyme
07/23/14 12:40 PM
INSTALLER REQUESTED IN AZ
by mickeyme
07/11/14 12:06 PM
INSTALLER REQUESTED IN CA
by usedphones
07/09/14 01:38 PM
INSTALLER REQUESTED IN CA
by mickeyme
07/08/14 07:34 PM
Alkaline, Li-ion, Ni-CD, Lithium, Ni-MH Batteries
Most Recent 5 Post
OS7200 vs MGI64
by tatenda
Adix VS
by Stix1
10:54 PM
Vertical Summit
by draynor
06:01 PM
CTG-1 with NEC1000
by tvanvickle
04:14 PM
DSX-80, one way audio at extension 301 only
by usbuild
02:07 PM
Who's Online
65 registered (tatenda, dexman, nameless, Skunky, R4+Z, upstateny, Hofman telekom, Lee07, OBT, newtecky, Test-ok, Old blond hippity hopping Bunnie, Stix1, Cepega, phoneguywayne, Dlr920, Justin M, justbill, ChrisRR, Silversam, brokeda, draynor, compu_85, Professor Shadow, RATHER BE FISHING, ffej010, skip555, hbiss, noisemarine, Derrick, doghart, mdaniel, dosjock, tim10, jimmy29, metelcom, JWRacedog, KENB, jeffmoss26, tampasteve, hawk82, hitechcomm, Bob3470, jimthomson, BobRobert, Mohammad Jaffal, clanier, nonameyet, JBean3329, Agus, MooreTel, tvanvickle, cvrbob, usedphones, usbuild, Ken B, epcompx2, chazrc, gelehu, Rcaman, escomm12, MattNat, kjwiewall, 2 invisible), 990 Guests and 102 Spiders online.
Key: Admin, Global Mod, Mod
(Views)Popular Topics
Ask the person below you a game. 3318006
Pictures of ugly work II 2406801
Just for Jokester #12 820621
Just for Jokester #13 701070
New Members: Post Here 517645
Pictures of Ugly Work IV 468966
Constructive Criticism 459827
Just for Jokester #14 420776
Pictures of Ugly Work V 315605
Just for Jokester #11 276707
Newest Members
JasePaq, johnhoff, Sal123, CPEBoxx, morrow
46262 Registered Users
Top Posters (30 Days)
dexman 61
Derrick 46
justbill 30
hitechcomm 28
KENB 26
Rcaman 24
Arthur P. Bloom 22
RATHER BE FISHING 22
brokeda 22
jeffmoss26 21
Tech Support Line 1.800.766.3425
Over the Phone Tech Support for your Phones and Business Phone Systems
Forum Stats
46262 Members
58 Forums
82629 Topics
574428 Posts

Max Online: 4713 @ 04/02/14 11:57 AM

Contact Us | 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


NEW Polycom Soundpoint IP 331 PoE 2200-12365-025 1-YEAR WARRANTY


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