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Phone Line Identification
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Phone Line Identification
08-03-2012 9:17 PM
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Sorry but I'm still at that age when I have to ask questions so....
How is my telephone line identified in my exchange.
Is it marked with my phone number or it's service ID......
....or maybe colour coded
I know we have some ex-telecom engineers around
How is my telephone line identified in my exchange.
Is it marked with my phone number or it's service ID......
....or maybe colour coded
I know we have some ex-telecom engineers around
Windows 10 Firefox 109.0 (64-bit)
To argue with someone who has renounced the use of reason is like administering medicine to the dead - Thomas Paine
To argue with someone who has renounced the use of reason is like administering medicine to the dead - Thomas Paine
3 REPLIES 3
Re: Phone Line Identification
18-03-2012 7:46 PM
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no exact idea myself...but, given that phone numbers can now be re-allocated by BT presumably by a software change:
Then I'd suspect that your line is identifed by something like it terminates in the Main Distribution Frames in something like Bay1 Rack7, Column 4 Row 9
Then in the software there is an allocation of your phone number to the said B1_R7_C4_R9 termination.
So when the BT staff want to ID/inspect the physical termination of the line they go and lookup in the software/GUI your telephone number and it gives them the termination point.
I also think they way they ID your line inside a PCP (which is a frightful mess usually) is to put a tone generator/oscillator on your phone termination point in your house and then use a detector to home in on which pair among the few hundred in the PCP is yours. I'd guess they get the exchange likewise to put an oscillatiing tone on from that end if they need to ID it from the other side.
Re: Phone Line Identification
19-03-2012 11:02 AM
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In ye olden times the MDF 2 wire jumper would run from the Line side to the Multiple (number) side. A 5 wire jumper would run on the Intermediate Distribution Frame (IDF) from the Multiple side to the Equipment side.
Now it's as described by x47c, at least for telephony. AFAIK, when ADSL is provided, the original jumper is recovered, and the Line and Equipment termination points would each have a jumper run to the ADSL equipment.
In the cabinet (PCP), the E (exchange) and D (distribution) termination points are numbered, and records are held showing the allocations to customer lines. In my day (up to 1999), the records were often unreliable, so the maintenance or provision guy would have to resort to tone identification as described by x47c. I have no reason to believe that things are any different now.
Now it's as described by x47c, at least for telephony. AFAIK, when ADSL is provided, the original jumper is recovered, and the Line and Equipment termination points would each have a jumper run to the ADSL equipment.
In the cabinet (PCP), the E (exchange) and D (distribution) termination points are numbered, and records are held showing the allocations to customer lines. In my day (up to 1999), the records were often unreliable, so the maintenance or provision guy would have to resort to tone identification as described by x47c. I have no reason to believe that things are any different now.
Murphy was an optimist
Zen FTTC 40/10 + Digital Voice FRITZ!Box 7530
BT technician (Retired)
Zen FTTC 40/10 + Digital Voice FRITZ!Box 7530
BT technician (Retired)
Re: Phone Line Identification
19-03-2012 11:55 AM
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Quote from: x47c no exact idea myself...but,
The rest of your post would tend to give a lie to that
Thanks guys for detailed answers to my question
I've used a tone probe kit on a commercial Cat5 and internal phone system and it's worth it's weight in platinum.
Windows 10 Firefox 109.0 (64-bit)
To argue with someone who has renounced the use of reason is like administering medicine to the dead - Thomas Paine
To argue with someone who has renounced the use of reason is like administering medicine to the dead - Thomas Paine
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