atcomsystems.ca/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems 1a2

after storm line goes to hold when hanging up. Already changed line card. same condition on all phones on line 1

Sounds like the A-Lead is open. Does your card work in another slot? If so, check your KSU wiring. The A-Lead on the KSU block should be the the 3rd pair (Wh/Grn).

The A lead is on the second pair, as in the tip side of the white/orange pair, but that is beside the point. What version of line cards do you have?

Are they all the same brand/model/version? Do things behave on the other line(s) on the system? Help us help you.

Do incoming calls on Line 1 come through OK?

Have you checked EVERY telephone on the system to ensure that one of them (1) does not have Line 1 pressed, and (2) is not "almost" on-hook?

You say that you changed the card. Did you use a spare card that was sitting in the dust on the shelf, or did you use a known-working one from another slot in the KSU?

Does the line lamp come on normally, when any station goes off-hook on line 1?

Does line 1 go on Hold normally, when the Hold button is pressed?

If you mechanically pop up the Line 1 button, (by pressing another line button) while in use, rather than placing the handset on hook, does the line go on false Hold?

Sounds like you have a high-resistant short circuit on the STATION T&R leaving the KSU. Maybe moisture, maybe a shorted ringing capacitor, maybe a lightning-struck phone.

You need to remove the line card and using an analog ohmmeter, check for resistance on the STATION T&R (white/blue - blue/white pair) going to each station. With the card out, you should see a kick, if there are bridged ringers, and then the meter should settle at infinity. Any significant reading above infinity indicates a short circuit on T&R, which will cause a false Hold condition.

For the benefit of all of our friends on the Forum, placing a call on Hold in 1A2 requires a very carefully-timed sequence of events:

Hold a call: The A lead must go OPEN just before the STATION T&R goes OPEN.

End a call: The T&R must go OPEN before the A-lead goes OPEN.

Both the line key and SWHK contact pile-ups are designed to open the T&R just before the A lead goes open. If they are out of adjustment, you get a false Hold condition.

When ending a call, if the line card sees a significant current draw on T&R, (caused by a S/C or high capacitance on T&R ... too many bridged ringers after the line card, for instance...) as the A lead goes open it will place the call on false Hold.

Actually, you're both right.

In the standard cut-down of a 584C panel, the first five pairs, and all subsequent groups of five pairs, are:

T&R CO
T&R STA
A-A1
LG-L
GRD-CMB

So, the third pair (x-Gr/Gr-x) is the A leads.

In a 501 or 551 KSU, the cut-down at the KSU block follows the color code of the mounting cord:

T&R STA
A-A1
LG-L

So, the second pair (white-orange/orange-white) is the A leads.

Any chance one of your 25pr cables is WET?

The OP said it happens on all phones so I was adressing the card's A-Lead and not the station's.

Actually, I would just manually test the line at the KSU with a butt set and a screwdriver working the A-Lead. Arthur has spelled out the sequence of events very nicely. You might also find it helpful to disconnect the station cross connect wiring first and then go from there.

I just heard from the OP that the pairs going to an extension in an outbuilding were the culprit. He didn't say exactly, but we assume it was a S/C on the 1st line T&R.

Arthur, S/C? (I know I'm gonna do a forehead smack)

SC =. Short Circuit
O/D = Over and Drop (Out of Order, broken). Refers to the cord board operators practice of throwing the defective cords Overthe top of the switch board and Dropping them down to ID them as unusable.

I used. To (have to) remember dozens of these. Now I'm blanking out.

Sam

I used to hate CAWT (Cleared away while testing)

You just knew it was going to come back to haunt you :scratch:

CH can't hear

CBH can't be heard

NDT no dial tone

BRCM bell rings can't meet

GWN gets wrong numbers

GCO gets cut off

NINC no incoming

O/O open out

O/I open in

OTS open tip side

ORS open ring side

HICAP high capacitance

S/C short circuit

HRSC high resistant short circuit

GTS ground tip side

GRS ground ring side

HOOL hears others on line

ETIR every time it rains

OHOP only has one phone

DIY dog in yard

WIM where is man?

IITYWYBMAD (pronounced eye-itty-wibe-mad)

I will leave that one to the intuitive reader, but if I tell you, will you buy me a drink?

Color Code:

Bell Operators Give Better Service
Why Run Backward, You'll Vomit

Arthur, please quit text messaging. OMG lol ur so funnyyyyyyyyyyyyyy

ED UR MY BFF

Yea Arthur, thats (some of) them.

And I never heard of that long obscure one you've got at the end...

Sam

If I Tell YOU Will You Back My Decision?

OK, I get it Im just real slow.


Sam

And let's not forget our favorite:

MBSWWYPBX


Sam

I will leave that one to the intuitive reader, but if I tell you, will you buy me a drink?

Wow. Arthur is the king of being subtle! I was even slower than Sam on that one. I had to read it a few times! :scratch: :thumb:

We were simple techs, CCO CCI OD R/T and the usual Central Office switch troubles. I don't think I ever heard of the Tip and Ring trouble codes, we just put Open or Grounded and my favorite CCWT for the CAWT (came clear while testing)

CBDT Can't break dial tone

CCO Can't call out

CBC Can't be called

BDR Bells dont ring

FOK Found o.k.

TOK Test o.k.

OS Out of service

NOS Not out of service

OOL Others on line

NA No access

PEBKAC problem exists between keyboard and chair

"I just heard from the OP that the pairs going to an extension in an outbuilding were the culprit. He didn't say exactly, but we assume it was a S/C on the 1st line T&R."

Sounds like the storm took out the pair going to the outbuilding causing the protector to fail. The gas type are supposed to deionize after they are activated if not a tip or ring ground will remain on the pair. Just a guess.

Yup, that's what I thought, as well.