Kitz Forum

Broadband Related => Broadband Technology => Topic started by: Weaver on March 13, 2017, 08:25:46 AM

Title: Latency differences between lines during flatout download
Post by: Weaver on March 13, 2017, 08:25:46 AM

Latency comparison: For some reason, my latency figures as shown on the clueless.aa.net.uk CQM graphs are very different  when comparing lines while doing a flat-out download. Line 1 is the fastest line, with a downstream sync rate of ~2800 kbps and line 4 a little slower at ~2600 k for some unknown reason.

(Line 3 is down following the lightning strike last Wednesday and I've been too groggy to properly organise things with my ISP, Andrews and Arnold, and get it sorted out.)

Hopefully this is a picture of the clueless CQM graphs (all-red line 3 is down):
    https://flic.kr/p/SHjhAz (https://flic.kr/p/SHjhAz)

The latencies are:
  *   Line 1:
   max 300-350 ms
   avg 190 ms !!
   min 40 ms

 *   Line 4:
   max 340-390 ms
   avg ~25 ms !!
   min ~25 ms

So the question is, why so different?

Title: Re: Latency differences between lines during flatout download
Post by: Chrysalis on March 13, 2017, 10:13:22 AM

is line 4 new? I thought you had 3 lines.

Title: Re: Latency differences between lines during flatout download
Post by: Weaver on March 13, 2017, 10:30:50 AM

@chrysalis - apologies, still three DSL lines. For hysterical reasons the lines are numbered a.1, a.3 and a.4, and I can't work out how to renumber them and keeps confusing things. I can't remember what the story was about #2 - could be a non-DSL pipe, such as 4G service to one of my SIMs.

Title: Re: Latency differences between lines during flatout download
Post by: huwwatkins on March 13, 2017, 02:22:36 PM

Is line 1 the slower of the two?

Title: Re: Latency differences between lines during flatout download
Post by: Weaver on March 13, 2017, 03:57:28 PM

Line 1 is ~200kbps faster downstream sync. (About ~2800 kbps as opposed to ~2600 kbps.)