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.
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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.