Kitz Forum
Broadband Related => Telephony Wiring + Equipment => Topic started by: JamesK on January 16, 2018, 04:50:06 PM
-
Hi All,
I'm considering getting a 2nd line installed. Am I correct in assuming that the following will happen:
- Engineer will use an additional pair of wires from the 10 pair service feed
- That pair of cables will be connected to a spare pair of cables on the CW1308 cable entering the property
- In the property the cable will extended if necessary and a new NTE5C will be installed adjacent to the existing one
If there's not a spare pair of cables on the existing CW1308, will the engineer install a new cable into the property? Will they make good if they need to channel out any plaster?
-
Engineer will use an additional pair of wires from the 10 pair service feed
Most likely.
That pair of cables will be connected to a spare pair of cables on wires in the CW1308 cable entering the property
Most likely.
In the property the cable will extended if necessary and a new NTE5C will be installed adjacent to the existing one
You should specify where you would like the socket to be located.
If there's not a spare pair of cables on wires in the existing CW1308, will the engineer install a new cable into the property?
Yes.
Will they make good if they need to channel out any plaster?
No. There will be no channelling into plaster and, thus, no making good.
-
^^^^ full marks for The Cat. ;D ;D
-
:drink:
-
Does a 2nd line induce crosstalk on to 1st line ?
-
There have been reports of noticeable crosstalk when both pairs in a drop-cable carry G.993.2 services.
However "noticeable" does not necessarily mean "significant" or "service affecting". ;)
-
Yes it does possibly introduce crosstalk, sort of, sort of not, erm. I have three lines - the first and second ones share a drop cable.
| Downstream: | 2.88 | 2.82 | 2.93 |
| Upstream: | 0.566 | 0.440 | 0.499 |
But the results don't make any sense in some respects. The figures relative speeds never vary, but all the downstream sync figures do go up and down a bit, while the relative ordering remains as is.
Why does line #1 always have by far the fastest upstream sync rate despite sharing a cable? And the upstream figures regarding the second and third lines make no sense.
Even if we say there is something wrong with the second line then that doesn't explain the comparisons between the first and third.
I have had them for about seven years, can't recall exactly - it might say on the forum even.
--
The NTE5A units (one recently replaced by an NTE5C, to my annoyance) are parked quite close together. I chose to have them in such a position. By a window in the upstairs office, so it minimise the length of outside cable run to zero and inside cable run to zero. There are no extensions, and no filters, however I acquired a faceplate with NTE5C unwillingly. There is no analog telephony, so no need for any filters.
The drop cable comes at height to the nearest corner of the house radially, all in an obsessive effort to avoid any chance of interference from any sources inside the house. I had the one and only point of entry relocated completely by a BT engineer back in 2003 iirc, cutting out a long external and internal cable run. Then the other two lines were installed later. Three ADSL2+ modems live <1m from the NTE5s each on the end of a piece of Tandy/ADSL Nation RJ11-RJ11 cable (http://forum.kitz.co.uk/index.php/topic,15910.0.html). Then there are ethernet cables going to my router nearby, more ethernet to main switch and various long CAT7 cables going off to devices including several WAPs.
-
Does a 2nd line induce crosstalk on to 1st line ?
Classed as a percentage of the total cross-talk encountered on the entirety of its length from Exchange/FTTC Cab to premises .......................... negligible.
-
Agree with Black Sheep, when you consider the lengths, and my numbers make no sense.
-
My brother briefly had two lines running fttc, it made no noticeable difference to the original line.
-
I have two VDSL2 lines. The installation of the second line was as described above. The two lines do interact, but it is inconsequential in terms of performance. Not as significant as the crosstalk introduced in general. Had a brief power outage this morning and momentarily saw a 20Mbps surge in attainable on both. :o
-
. . . and no filters, however I acquired a faceplate with NTE5C unwillingly. There is no analog telephony, so no need for any filters.
You need to obtain a short patch lead, BT 431A (or 631A) plug on one end and a modular 6P2C plug on the other end. Remove the SSFP from the NTE5/C and connect via the exposed "test" socket.
-
Indeed, just going back to the old dial-up modem type BT cables. Need a short one of very high quality but very hard to google these now as they are an endangered species or very long, obviously, for modems, or very cheap and nasty for telephony or special-purpose devices.
-
You could plug a UK-USA adaptor (eg https://www.amazon.co.uk/BT431A-RJ11-telecom-test-adaptor/dp/B000Q8L33E (https://www.amazon.co.uk/BT431A-RJ11-telecom-test-adaptor/dp/B000Q8L33E)) into the test socket and then use a standard RJ11-RJ11 cable.
:)
-
You could plug a UK-USA adaptor (eg https://www.amazon.co.uk/BT431A-RJ11-telecom-test-adaptor/dp/B000Q8L33E (https://www.amazon.co.uk/BT431A-RJ11-telecom-test-adaptor/dp/B000Q8L33E)) into the test socket and then use a standard RJ11-RJ11 cable.
:)
Beware that if it's an NTE5C (the newer master socket) that you need to be weary of the height of the adaptor, I had one which unfortunately wouldn't go in because the top half was partially being blocked by the plastic on the upper half of the NTE5C master socket (test socket exposed).
-
Ixel - looking at a photo of an NTE5c I see what you mean, the overhang is very tight against the top of the test socket.
Best scrap that idea. :no:
My next suggestion would be to chop one end from a standard modem lead and fit a BT431A to it. The plugs usually come with the fitting tool - you just squeeze them up in a small vice.
:)
-
Maybe this would work?
https://www.ebay.co.uk/itm/RJ11-to-BT-Telephone-Phone-Socket-Plug-Adaptor-Converter-US-to-UK-White-/172364149957
Or even this?
https://www.ebay.co.uk/itm/Female-RJ11-Socket-to-UK-BT-Plug-Telephone-Phone-Adapter-2-Wire-Specification/302588419481
-
They both look good - well spotted.
:)
-
Thanks very much Ixel! Very useful
-
Thanks very much Ixel! Very useful
You're welcome :). The only other option is an RJ11 to BT LJU cable, but these cables are typically unshielded and flat so are cheaply designed in my opinion. I managed to find a shielded by somewhat lengthy RJ11 to BT LJU cable buried amongst my spare stuff which I'm currently using in my server cabinet to the test socket which I bought from somewhere a long time ago but I've never seen anything like it for a long time no matter where I look. Prior to that AAISP kindly sent me a RJ11 to BT LJU cable free of charge (along with some stickers, one of which is proudly stuck to the front of the server cabinet :P).
-
Thinking along similar lines see http://forum.kitz.co.uk/index.php/topic,20890.0.html