PSTN with PBX advice please!

Just trying to help out a friend who has an old internal analogue PBX system hanging off a single analogue line...

They currently have ADSLMax on that line all working fine but BT say that fibre cannot be enabled....

All a bit vague - but should there any technical reason why not? BT Checker says Yes, and predicts a lovely full fat 80 for fibre, but BT humans say no...

Many thanks!

Are they saying FTTC can't be ordered because of the PBX?

It's looking that way - but there may be crossed wires (!) - I'm going to end up speaking to them myself methinks...as I think my friend gets baffled by BT each time they attempt to get further...

I presume, due to there already being ADSL Max on the line, that there is already an NTE with a faceplate ADSL filter fitted on the feed before the PABX switch ?

If so, then this is a doddle for anyone to fix.

No physical reason why the line cannot be used for FTTC, more than likely that some 'marker' on the line creates a 'computer says no' scenario.

That's what I was thinking

Yep - faceplate and filter before PABX ...

Thanks for the sanity check

No probs, now all you have to do is persuade, politely, a CP to order the service.

Good luck.

Zarjaz

Would an earth calling PBX still work with FTTC or would the line length from the cab to exchange be too long? If so this could be the problem if the PBX is that old. That is the only thing I can think that would show on the BT side.

In all honesty, I don't know.

It must be ten plus years since I worked on an earth calling line !

Would ADSL function on an earth-calling line?

That's another 'pass' from me, technically I can't think why not, and maybe that's the answer for if FTTC would work also ???

A little bit of lateral thinking.

ADSL and VDSL normally work on both legs - there is a serious drop off if on leg is dis. That suggests that there is some form of isolation between both legs and earth at some point in the path from End User premises to Exchange. For VDSL that must happen at the cabinet whereas for ADSL it is back at the exchange. So, just wondering if rather than it causing a problem with the VDSL signal, it is suggesting a problem with the analog line would be caused.

Just a thought ... and for me it is 25 years since I was designing switches with various line interfaces.

Did BT not give a reason why?

If you have a standard NTE filtered for ADSL there's no physical reason I can see either why you can't have FTTC.

My guess is it's the BT Openreach records for the line preventing the product from being ordered. In fact, if it's what I'm thinking, itwould prevent any broadband product being ordered i.e. ADSL2+

Ask BT to get the installation details for the line and tell you what the Termination Type is. If it doesn't say Line Box then that's the problem.

If they are unable to tell you drop me a PM on here and I'll try and help.

"Hello Earth" this is....... Line

Seriously, I have an analogue PABX and FTTC. Engineer install as they all were in 2011.

However, the PABX is a purchased one simply plugged into the NTE with faceplate VDSL filter.
Could it be that the OP's PABX is a BT supplied one? Otherwise how would they know it exists? ISTR that 2-line PABXs at one time had to be supplied and wired in (no NTE and plug) by BT.

Cheers!

Thanks all!

I will chat with BT today and have the conversation first hand

Let us know what they say. However, you are unlikely to get someone with a good technical understanding of the issues, they will probably say "because the system says you have XXXX".

Just curious if this was ever resolved?