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Author Topic: Sync speed difference between RJ11 cables.  (Read 26426 times)

burakkucat

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Re: Sync speed difference between RJ11 cables.
« Reply #60 on: August 19, 2017, 01:05:40 AM »

I am also trying to get hold of a ZyXEL 3925 to test in bridge mode to see if any improvement over the 1312.

Here's one that I noticed earlier today.

I have been wondering, is maximum synchronisation speed really the best metric to rate the various cables? Ixel has mentioned ES . . .
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banger

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Re: Sync speed difference between RJ11 cables.
« Reply #61 on: August 19, 2017, 01:25:50 AM »

Thanks, Mr B*kat I have already bid on the one you linked to. There is another for £8.98 starting bid. We will see what happens.

As for the cable experiment. I have zero DS errors and about 20 US errors a day and this has remained fairly constant throughout the experiment which I think is down to the modem keeping errors down.

The only noticeable difference has been sync speed. I can produce 16 DS errors by pulling out the DSL cable and re-connecting. But I have found that disabling the modem power on DSL then disconnecting the cable and reconnecting a new cable produces zero DS errors. Why this is I am not sure but I am all for producing zero errors during my experiments.
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Tim
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Asus RT-AC68U and ZyXEL VMG1312-B10A Bridge on 80 Meg TTB Fibre

https://www.thinkbroadband.com/speedtest/1502566996147131655

burakkucat

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Re: Sync speed difference between RJ11 cables.
« Reply #62 on: August 19, 2017, 01:47:41 AM »

Ah, I see.  :)

xdslctl connection --down

Swap cables.

xdslctl connection --up

Would be my recipe.
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banger

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Re: Sync speed difference between RJ11 cables.
« Reply #63 on: August 19, 2017, 02:10:23 AM »

Yes that is what I do except I use the ZyXEL power management gui to disable DSL power but effectively the same thing.
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Tim
talktalkbusiness.net & freenetname
Asus RT-AC68U and ZyXEL VMG1312-B10A Bridge on 80 Meg TTB Fibre

https://www.thinkbroadband.com/speedtest/1502566996147131655

GigabitEthernet

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Re: Sync speed difference between RJ11 cables.
« Reply #64 on: August 19, 2017, 07:38:26 PM »

Received the "troublesome connections" 0.5 cable today. Syncing at 54997 down and 10000 up so not cut the sync. Obtainable is around the same.

Will monitor for the next 24 hours.
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Ixel

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Re: Sync speed difference between RJ11 cables.
« Reply #65 on: August 21, 2017, 11:32:59 AM »

I've just received and switched to this cable.

I've lost around 2 Mbps attainable rate on the downstream (down from 59392 to 56980), slightly better upstream attainable rate, no FEC errors in the first five minutes of uptime so far (which is unusual). I'd usually have a few hundred at the very least but it's 0. Power level has also dropped slightly from 6.0/6.2 to 5.6/5.8. Signal attenuation on D1 has risen from 23.3 to 24.3. Signal attenuation on D3 has risen from 50.3 to 51.3. All other signal and line attenuation values are the same as the Cat6 cable I was using.

This is from the ASUS DSL-AC68U with my own tweaked settings. I'll run for 15 hours or so and post results tomorrow morning.
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GigabitEthernet

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Re: Sync speed difference between RJ11 cables.
« Reply #66 on: August 21, 2017, 11:57:49 AM »

I've had the same cable over 24 hours now and I think my SNRM is less spiky than it was, it seems more consistent.
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Ixel

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Re: Sync speed difference between RJ11 cables.
« Reply #67 on: August 21, 2017, 12:02:04 PM »

I've had the same cable over 24 hours now and I think my SNRM is less spiky than it was, it seems more consistent.

Are the error rates any different?

I've been running for 40 minutes now and I've not had a single error second, I normally get 1 every 30 minutes, typically 2 every hour (with my current ASUS settings). FEC errors are way lower too at the moment.

Code: [Select]
>wan vdsl2 show mgcnt
near-end path0 fec:     590
near-end path0 crc:     0
near-end fec sec:       11
near-end err sec:       0
near-end ses sec:       0
near-end los sec:       0
near-end ua  sec:       0
far-end path0 fec:      4
far-end path0 crc:      0
far-end fec sec:        2
far-end err sec:        0
far-end ses sec:        0
far-end los sec:        0
far-end ua  sec:        0

By now I'd normally have much more than that.

To compare last connection which had 18 hours or so of uptime.

Code: [Select]
near-end path0 fec:     119632
near-end path0 crc:     52
near-end fec sec:       1889
near-end err sec:       37
near-end ses sec:       0
near-end los sec:       0
near-end ua  sec:       0
far-end path0 fec:      29
far-end path0 crc:      1
far-end fec sec:        20
far-end err sec:        1
far-end ses sec:        0
far-end los sec:        0
far-end ua  sec:        0
« Last Edit: August 21, 2017, 12:05:14 PM by Ixel »
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GigabitEthernet

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Re: Sync speed difference between RJ11 cables.
« Reply #68 on: August 21, 2017, 12:13:03 PM »

I've got G.INP on my line (had it on the up and down), so ES are zero as they were before. US G.INP was removed today and I've had 4 US error seconds in the 1 hour 8 minute connection time, 4 upstream CRCs, 14 FECs. On the downstream I have had 6820 FECs.

The counters for G.INP look about the same.

Edit:

Looking at the SNRM, it looks about the same over an extended period of the time. FEC rate seems to have gone down.
« Last Edit: August 21, 2017, 12:17:29 PM by GigabitEthernet »
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Ixel

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Re: Sync speed difference between RJ11 cables.
« Reply #69 on: August 21, 2017, 12:15:10 PM »

I've got G.INP on my line (had it on the up and down), so ES are zero as they were before. US G.INP was removed today and I've had 4 US error seconds in the 1 hour 8 minute connection time, 4 upstream CRCs, 14 FECs. On the downstream I have had 6820 FECs.

Ah, I see, yeah G.INP will kind of mask errors. Still sounds good. I'm hopeful my connection in terms of errors/stability will see a massive benefit to using this cable and losing only around 2 Mbps downstream. I could probably get that speed back anyways by reducing the Tx Power a little since I now have a slightly higher upstream attainable rate.
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NewtronStar

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Re: Sync speed difference between RJ11 cables.
« Reply #70 on: August 21, 2017, 11:08:02 PM »

Have been using Mr telephone's Cat6 twisted 1M for over 2 years and the Data Extension socket terminates just behind the wall mounted flat screen TV definitely no RF from TV getting into the modem using this cable  :fingers:
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AngelRex

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Re: Sync speed difference between RJ11 cables.
« Reply #71 on: August 22, 2017, 01:18:36 PM »

I looked at the link above and it said not taking orders now?

I need a 0.5m one to test, thoughts?
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Ixel

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Re: Sync speed difference between RJ11 cables.
« Reply #72 on: August 22, 2017, 03:58:31 PM »

Odd, the 0.5m cable link works fine for me (unless you've seen a different link to the one I used?). This is what I used until today. Overall results were that FEC errors seemed much lower but in the end the error seconds and CRC errors were roughly the same as the Cat6 cable which had slightly better downstream attainable rate (+2 Mbps approximately). I've gone back to the Cat6 cable today as my connection is now finally back on 80/20 and more ASUS stability testing to do.
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AngelRex

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Re: Sync speed difference between RJ11 cables.
« Reply #73 on: August 23, 2017, 02:00:02 PM »

Many thanks! Good luck with the testing
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GigabitEthernet

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Re: Sync speed difference between RJ11 cables.
« Reply #74 on: August 23, 2017, 03:30:14 PM »

I have come to the conclusion the black RJ11 isn't any different on my circuit to a 0.7m Cat5e cable and so I have reverted to that.
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