Kitz Forum
Broadband Related => ADSL Issues => Topic started by: Weaver on February 01, 2018, 03:33:42 AM
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Upstream
am wondering why my lines’ upstream performance is so bad or good?
I has been like this for a couple of years
line a.1 560k - 570k
line a.3 440k - 450k
line a.4 450k - 500k
( line 4 was usually around the 500k mark, recently dropped by 45k suddenly which is unusual.)
a.1 and a.3 share the same drop cable, a.4 is on its own.
Line 1 is the mystery - why has it so good, it has always been 22-29% better than line 3 _and_ usually 10% better than line 4?
Line a.3 why so bad relatively- so much worse usually than line 4 and, leaving aside the recent blip, a lot worse than line a.4 which is usually around ~500k as opposed to line a.3’s constant 440k-450k.
I wonder what I can do to improve line a.3?
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a.3 - could it be crosstalk from a.1 with them being in the same pair? Not sure :-\
The sudden drop on the upstream on a.4 could be an emerging HR fault.
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Since changing to the ZyXEL VMG1312-B10A modems, my upstream speeds have been
line cwcc@a.1 500k
line cwcc@a.3 440k
line cwcc@a.4 440k
so significantly worse than with the DLink modems, which is really bad news.
I took a look at the bits-per-bin loading on the upstream of lines cwcc@a.1 vs cwcc@a.3m shown below. (These two lines are the two pairs within one drop cable.)
Bits per bin upstream of modem on line cwcc@a.1 vs line cwcc@a.3
bin# bits freq bits
0 0 0.0000 0
1 0 4.3125 0
2 0 8.6250 0
3 0 12.9375 0
4 0 17.2500 0
5 0 21.5625 0
6 0 25.8750 0
7 8 30.1875 8
8 9 34.5000 9
9 10 38.8125 9
10 10 43.1250 9
11 10 47.4375 9
12 9 51.7500 9
13 9 56.0625 8
14 9 60.3750 8
15 9 64.6875 8
16 8 69.0000 7
17 8 73.3125 7
18 8 77.6250 7
19 8 81.9375 6
20 7 86.2500 6
21 7 90.5625 6
22 7 94.8750 6
23 7 99.1875 6
24 7 103.5000 5
25 6 107.8125 5
26 6 112.1250 5
27 6 116.4375 5
28 6 120.7500 4
29 5 125.0625 4
30 5 129.3750 4
31 0 133.6875 0
32 0 138.0000 0