sncsnc

i'dd check what kind of loop current you have on your BT lines
panasonic is not to kind to high loop current and i'dd also double check
that lines are set properly for caller id and do you have a call log button on all pt telephones?

Badger

Try increasing the SLT ring wait time for new call in program step 627.

The CLI is read during the first ringing phases on the system. If you are experiencing several simulataneous calls, step 627 will help as several SLT's require a short pause whilst one call stops ringing and the next one starts in order to detect the CLI.

Also, if staff are answering the call very quickly, the CLI may not be presented. I've known it to take a couple of ringing cycles for the CLI to be presented.

Try making some test calls, getting staff to wait say 10 seconds before answering is the CLI then presented?

rod_vw

Thanks sncsnc & Badger

This customer is over 2 cable miles from the exchange so I don't suspect high loop current.

We have tried leaving the sets ringing for a number of ring cycles and still had no CLI display. With only two lines and a 'quiet' system the incoming traffic is not an issue.

Panasonic have suggested a systen change-out as they have no better suggestion.

Any more thoughts would be most welcome, I will report results of the system change-out as and when.

Thanks again,

Rod

Cnavarro

It's not a question of what you suspect or don't suspect. Read the loop current, then you don't have to speculate. Or, just swap out the system and maybe you can fry two for the price of two

Carl

Badger

I have a suggestion that will prove whether the fault is with the system or network and it's pretty easy to implement:-

Install a 2/1A master socket across the BT line (s) BEFORE the line connects to the system. Plug in a CLI enabled POT phone into these sockets.

When a call comes in, these phones will ring, as will the phones on the system. Look to see if the CLI is present on the system phones and on the POT phone across the line.

If theres no CLI on the POT phone across the line, it's a network issue. Dead easy to test and I'd suggest doing that before swapping the system out.

Also, who did you speak to at Panasonic that suggested the swapout? Did you get a name?

rod_vw

Cnavarro,

I'm more than happy to go along with the idea of checking the line current but please help me with the test conditions and current upper and lower limits. Under what loop / load conditions should I do my readings? For example, should it be with a fixed loop resistance (600 Ohms)?

The question of line current (except for very low currents / high line resistance) has never been an issue to me here in the UK and I have been involved with PBXs since 1980. But I'm always willing to try another idea.

Regards,

Rod

sncsnc

you put your digital meter on milliamps setting in series with
your butsett and clip on to thr line and go off hook if it reads more than 30 you got to much loop current going to your key equipment.
and badger putting a pots caller id box on the line will not tell you
if there is excessive loop current going to the kit....

Loop Current and Circuit Loss Tech Bulletin

rod_vw

Hi all,

Just an update on the situation.

Line current 40mA.
Good earth on system.
CLI being supplied by both CO lines.
SLTs receiving CLI sometimes. These are cordless DECT phones and the display can be scrolled back through.
PTs displaying 'EXTERNAL' on all incoming calls.

Complete system change-out for new one (inc CLI module).

NO CHANGE in problem!!!

Suspect problem is that exchange lines are BT Feature Line circuits. This should have been removed by today but had not when I left site at 2:00pm. Waiting for customer to report when this has been done then we will see if there is any change in the symptoms.

Thanks for your thoughts, will update when more to report.

Rod,

sncsnc

40ma is way too high we're looking for more like 28ma