What happens those too far from cab?

Hi guys,

I was just wondering what could be the future for 'fibre' broadband for those that live around 2 miles from the cabinet which is enabled & can't receive a FTTC connection.

Is it possible for BT to put a cabinet closer to peoples homes / businesses and reconnect their lines to this cabinet? What else could they do?

Thanks

Jack

BT will probably do nothing commercialy. BDUK may do something if you get less than 2Mbs. They would probably use wireless

Next year there should be the option of FTTP on demand, although from what I've read on forums costs could be anywhere between £500 to £1500, but they are only guesses. No one really knows how the distance would affect price either, but it's not expected that the first person pays the full cost then the neighbour gets it cheaper, prices are expected to be levelled somehow.

In reality it's likely to be too expensive for the majority

A lot depends on what speeds you get now, and if that means work is needed to get you 2 Mbps then it is possible FTTC might provide that at this distance, or a regenerator be fitted to the loop to boost the ADSL2+

Regenerators are more the way BT is going than BET which has largely been sidelined now.

Wireless as in 4G may be an option used. It is very much a case of what the council decides and what BT if their are the contractor in that area offer. Some areas are using satellite to hit the 2 Mbps target.

In reply to a post by MrSaffron:

Regenerators are more the way BT is going than BET which has largely been sidelined now.

What is BET ?

Hi there guys,

I know that the speeds I get aren't as bad as what other people get, we currently get around 7Mbps here on ADSL2+.

The exchange is around 2.1 miles down the road & we are 2.0 miles to the exchange (both right beside each other).

I have a business here and we use around 250GB (no very heavy downloads) and it runs a bit slow at times when the network is a bit congested. Full gigabit networks internally though.

I believe that there are some counties which are more keen to get 'fibred' up more than others. For example, in Northern Ireland, I believe every single FTTC cabinet has been enabled. I live in NI but am not entirely sure whether and when they will increase that USC.

Broadband Extension Technology

So your cabinet is right outside the exchange?

Yup - only about a 6 metre walk from cabinet to exchange.

Was just checking, as some people get confused between exchange building and green street cabs.

At 7 Mbps I doubt anyone will be rushing to do much to improve things on the line for a few years. Fibre on Demand when it comes may be best bet, but expensive for you.

http://www.thinkbroadband.com/news/4050-openreach-an...

A friend is in a similar but worse situation.

He is too far for ADSL MAX to get any sync, Openreach engineer said that the line length to the exchange is 9.7km.

Prior to the cabinet being enabled the BT Checker siad that he would he get a service at 900kbps, but now the cabinet has been enabled there is no mention of FTTC.

He is 1.2miles from the cabinet, nearly all of which is on overhead poles.

If he could really get a reliable 900kbs service it would be well worth it compared to his current dial up, but how would he persuade an ISP to try it?

Problem being that if memory is working, Openreach generally don't install below 5 Mbps, so needs an ISP that will push hard and as most go via BT wholesale this makes things more difficult

Even a pushy ISP is unlikely to get an installation of that type. I have heard of ones where the forecast was around 4Mbps being "forced" through but at 900k with overhead lines which are more susceptible to noise there is a good chance that it would fail.

PLusnet seem to cater for low speed FTTC customers.

1.2 miles or around 2000m does not seem an excessive distance from the cabinet.

I would imagine that download speeds could be substantially higher than 900kbps, possibly around 6Mb to 8Mb or so.
However, I would expect upload speeds to be as low as 0.5Mb over that distance.

I have seen a 1 mile FTTC connection achieve 12Mb dowload & 0.9Mb upload.


EDIT:

Sorry, my memory played tricks on me.

It was more like 12.7Mb & 0.67Mb actual sync speeds:-

Text

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# xdslcmd info --pbParams xdslcmd: ADSL driver and PHY statusStatus: Showtime Retrain Reason: 0Max:    Upstream rate = 721 Kbps, Downstream rate = 13232 Kbps Path:   0, Upstream rate = 670 Kbps, Downstream rate = 12726 Kbps  Discovery Phase (Initial) Band PlanUS: (0,95) (880,1195) (1984,2771) DS: (32,859) (1216,1959) (2792,4083) Medley Phase (Final) Band Plan US: (0,95) DS: (32,859)        VDSL Port Details       Upstream        DownstreamAttainable Net Data Rate:        721 kbps         13232 kbps Actual Aggregate Tx Power:        1.2 dBm           8.2 dBm============================================================================   VDSL Band Status        U0      U1      U2      U3      D1      D2      D3  Line Attenuation(dB):  8.2     65.4    62.3     N/A    26.4    0.1     0.1    Signal Attenuation(dB):  8.2      N/A     N/A     N/A    26.4     N/A     N/A           SNR Margin(dB):  7.6      N/A     N/A     N/A    4.4      N/A     N/A            TX Power(dBm):  1.2      N/A     N/A     N/A    8.2      N/A     N/A

Edited by deleted (Sun 18-Nov-12 12:31:39)

I'm of the opinion that 2km is very much a problem.

Unfortunately, it is one of those areas that is hard to be even semi-accurate about. Some searches online suggest that BT's practical limit is around 1500 metres - but everyone is focussing on what is happening to the downstream speed at this distance (particularly when BT was limiting downstream to 15Mbps), and the race to 80/20 speeds may have impacted on lengthier lines; some VDSL2 products specify 2km as the maximum distance (such as this one), while this card has dropped to 16 down, 0.3 up at 5,000 feet (1600 metres). This primer asserts that VDSL2's long reach is up to 2.4km.

Some of the semi-technical write-ups specify that VDSL2 starts to behave like ADSL2+ at the 2km point. Wikipedia mentions this (but it also mentions a LR-VDSL2 protocol for long range). ZDNet had this to say a while back.

Practical experience (but only from seeing what other people post; it isn't first-hand experience) makes me think that it is really upstream that is the limiting factor on extreme distance cases - and that the UK variant of VDSL2 is not behaving like ADSL2+ at distances beyond that. I'm not sure if that is a consequence of the way we use the US0 band for the final, longest range, upstream capability. Or the way we use the power levels of our 17a profile or, more particularly, the power masks applied over the low frequencies so the cabinet does not interfere with exchange-based ADSL (and ADSL2+) - although they're more for downstream than upstream.

Or perhaps BT's upstream power-backoff mechanism is tuned for short lines, rather than long lines. Even though it only applies to the power in the higher-frequency bands, the tuning does make a difference to the upstream speed available out at 1500 metres. Take a look at this document on The art of spectral management, UPBO, especially page 3. I guess BT have used a reference length close to the first 2 graphs.

(BTW: There's also a matching document on The art of Spectral Management, Frequency Allocations.

As bald-eagle notes - that 1600 metre line could still manage 12.7Mbps down, but only 0.7Mbps up. and one device predicted 0.3Mbps up.

Is it worth installing FTTC lines when the upstream speed is getting lower than 0.3Mbps?

1.3 miles from the cabinet.

Getting 19Mb downstream and 1.2Mb up with Plusnet.

When the FOD becomes available I will look into it but if I am even considered and the survey talks telephone numbers they can jump!

I'll have to re-think then. That's 2.1km, so quite impressive.