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Author Topic: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)  (Read 83444 times)

Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #180 on: June 14, 2018, 10:53:46 PM »

Can one tweak SNRM with these devices? If so, what are the magic incantations? And is there any way of making it persistent?
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burakkucat

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #181 on: June 14, 2018, 11:02:46 PM »

> xdslctl --help
Usage: xdslctl start [--up] <configure command options>
       xdslctl stop
       xdslctl connection [--up] [--down] [--loopback] [--reverb]
           [--medley] [--noretrain] [--L3] [--diagmode] [--L0]
           [--tones <r1-r2,r3-r4,...>] [--normal] [--freezeReverb] [--freezeMedley]
       xdslctl configure/configure1 [--mod <a|d|l|t|2|p|e|m|M3|M5|v>] [--lpair <(i)nner|(o)uter>]
           [--trellis <on|off>] [--snr <snrQ4>] [--bitswap <on|off>] [--sesdrop <on|off>]
           [--sra <on|off>] [--CoMinMgn <on|off>] [--i24k <on|off>] [--phyReXmt <0xBitMap-UsDs>]
           [--Ginp <0xBitMap-UsDs>] [--TpsTc <0xBitMap-AvPvAaPa>] [--monitorTone <on|off>]
           [--profile <0x00 - 0xFF>|<"8a |8b |8c |8d |12a |12b |17a |30a">] [--us0 <on|off>]
           [--dynamicD <on|off>] [--dynamicF <on|off>] [--SOS <on|off>] [--maxDataRate <maxDsDataRateKbps maxUsDataRateKbps maxAggrDataRateKbps>]
           [--forceJ43 <on|off>] [--toggleJ43B43 <on|off>]
       xdslctl bert [--start <#seconds>] [--stop] [--show]
       xdslctl afelb [--time <sec>] [--tones] [--signal <1/2/8>]
       xdslctl qlnmntr [--time <sec>] [--freq <msec>]
       xdslctl inm [--start <INMIATO> <INMIATS><INMCC><INM_INPEQ_MODE><INM_INPEQ_FORMAT>] [--show]
       xdslctl snrclamp [--shape <shapeId>] [--bpshape [bpIndex-bpLevel,]]
       xdslctl nlnm [--show ] [--setThld <Thld_Num_Tones>]
       xdslctl diag [--logstart <nBytes>] [--logpause] [--logstop] [--loguntilbufferfull <nBytes>] [--loguntilretrain <nBytes>] [--dumpBuf <sizeKb>]
       xdslctl ntr [--start [output freq(default is 8000)]] [--stop]
       xdslctl info [--state] [--show] [--stats] [--SNR] [--QLN] [--Hlog] [--Hlin] [--HlinS] [--Bits]
                    [--pbParams] [--linediag] [--linediag1] [--reset] [--vendor] [--cfg] [--webstats]
       xdslctl profile [--show] [--save] [--restore]
       xdslctl --version
       xdslctl --help
 >


I would suggest something like --

xdslctl configure --snr <value>
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spring

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #182 on: June 14, 2018, 11:04:35 PM »

I've heard Broadcom chips can't tweak target margin on VDSL. So you can't do it from the modem, rather on the ISP end.
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #183 on: June 14, 2018, 11:06:47 PM »

I believe you can, its something on long the lines of xdslctl configure --snr X, but let me get back to you after a bit of a read.

https://wiki.kitz.co.uk/index.php/Broadcom_CLI#adsl_command

I think this still holds true on these devices, but some experimentation is probably required.

The adventurous might try:
Quote
xdslctl configure --snr 80

for an approx 1db reduction. But as I say some further reading is in order if you are up for trying it out. 

Edit: persistence is another matter, but if it works for you maybe there is a way of making it stick with some scripts baked into the firmware
« Last Edit: June 14, 2018, 11:13:34 PM by johnson »
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spring

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #184 on: June 14, 2018, 11:11:13 PM »

https://forum.kitz.co.uk/index.php/topic,21632.msg373790.html#msg373790

I also read it on Google after that. If someone still wants to try it then it's his decision.
« Last Edit: June 14, 2018, 11:25:52 PM by spring »
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #185 on: June 14, 2018, 11:14:37 PM »

Weavers line is ADSL spring, it should work.
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spring

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #186 on: June 14, 2018, 11:15:49 PM »

Oh, well, right, my bad, I mentioned it's VDSL though.

Also, I think it's because of how frustrated I was about this fact, as I have a Broadcom, and ECI cannot set a target margin either, so stuck on 6dB.
« Last Edit: June 14, 2018, 11:23:45 PM by spring »
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j0hn

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #187 on: June 15, 2018, 12:55:04 AM »

DslStats has a page with SNR tweaks for ADSL.
You can adjust the SNR offset up or down in 0.1dB increments.
Never used them myself but DslStats is built for Broadcom devices so should work for Weaver.
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Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #188 on: June 15, 2018, 04:43:09 AM »

Some users would definitely find that excellent ‘baked-in script’ (baked in :-) ? ) or built-in or whatever to be a very very useful feature? That is such a good idea.

I am already on 3dB downstream target so I am probably asking for instability based on experience with the DLink modems, which used to droop to 1.5dB or even 0.6-0.8dB long-term. I do have, we think, the Broadcom equivalent of ADSL2 G.INP although they call it "PhyR" (ie PhyRTx) iirc. So that could mean I might be able to push it harder without huge trouble. But a loss in performance due to many PhyR retransmissions might cancel out the modest speed gains obtained from higher sync rate.

What would you recommend. Should I roll back to your first firmware release? The one with just the jumbo 1508 MTU mod in it?

(I need a system of version numbers to talk about your excellent custom releases. Internally I have named the image files with something like an xxx-CSW-v01 suffix so I can keep them organised and refer to them somehow.)
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Ixel

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #189 on: June 15, 2018, 01:57:22 PM »

Oh, well, right, my bad, I mentioned it's VDSL though.

Also, I think it's because of how frustrated I was about this fact, as I have a Broadcom, and ECI cannot set a target margin either, so stuck on 6dB.

Just to clarify, in case some people here aren't aware, although it's not a modem with a Broadcom chipset... the Lantiq/Infineon chipset offers the ability to change the downstream SNRM offset in 0.1 dB increments on VDSL2 and ADSL connections as well (where Broadcom chipset doesn't seem to do the same for VDSL2 connections). That is also assuming the connection isn't capped/banded and running at the maximum allowed speed.

Depending on what modem you're using which has a Lantiq/Infineon chipset, perhaps the ECI /r, something like the following should work:
dsl_cpe_pipe.sh locs 0 50
dsl_cpe_pipe.sh acs 2

This would effectively bump the downstream target SNRM up by +5 dB and cause the connection to re-sync with that change. The '50' value can be changed to another value between -50 to 50, in increments of 1 (effectively 0.1 dB). A setting of -30 for example would be -3 dB, so if you normally sync with a target SNRM of 9 dB then this would decrease it to around 6 dB for the downstream.

DrayTek routers usually offer this option as well, since they have a Lantiq/Infineon chipset, however it's done differently... such as:
vdsl snr -30

This setting should also be retained between reboots which is nice, if it's not then just do 'vdsl savecfg' to be absolutely sure.
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Weaver

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #190 on: June 16, 2018, 08:05:36 AM »

Should I go back to the earlier VMG 1312-B10A custom firmware (with unchanged low-level driver) ?
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hushcoden

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #191 on: June 16, 2018, 10:34:10 AM »

New firmware for VMG1312-B10A, 1.00(AAJZ.16)C0
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #192 on: June 16, 2018, 10:35:48 AM »

Again not sure if I'm responding when you'd prefer input from others with more experience, but, if its not that much trouble, why not try it out of one of your 3 modems and gauge the difference? With your saved xml configs even if the flash takes out your settings (which it doesn't for me) you can try one modem with the original adsl_phy with minimal effort and see what difference it makes.

To complicate matters I just made a firmware with the much older A2pv6F039o1 adsl_phy.bin from the AAJZ.7 firmware I was talking about previously. It has only the jumbo frames patches, no reverted telnetd bin for multiple sessions as I thought that might complicate things.

I've tested it to boot, but nothing further.

https://www.dropbox.com/sh/lijl9krbghcpc2c/AAAlzU2b8mtbZ0k2shjVJpINa?dl=0


Sorry for probably needlessly confusing things, just thought I'd offer the older one like I said I would.
« Last Edit: June 16, 2018, 12:03:29 PM by johnson »
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johnson

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #193 on: June 16, 2018, 10:40:39 AM »

New firmware for VMG1312-B10A, 1.00(AAJZ.16)C0

Good spot!

As far as I can tell from the patch notes these are the only two changes:

Quote
1.
There are compatibility problems in IE 8 when web encryption, so remove two enhance
.
(1).
Revert “Hide Authentication password when editing SIP Account in GUI.”
(2).
Revert “Implement web POST encryption”

......

1.
Security patch
Device security fix on debugging web pages access without authentication.

So IE8 compatibility and something to do with unauthenticated webpage access.
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hushcoden

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Re: BCM63168 Modems that Support Baby Jumbo Frames (Bridge Mode)
« Reply #194 on: June 16, 2018, 10:48:42 AM »

Ah so probably not worth it to update...
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