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VDSL Modem Data (2860)

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18 Jul 2013 11:35 #77006 by andyhamp
VDSL Modem Data (2860) was created by andyhamp
Hi,

I'm looking through the UI and telnet commands looking for comprehensive information on the VDSL modem, specifically around find error rates. The SNR and attenuation seem OK to me ... At the moment my speeds arn't bad but my ping times are > 30ms which is horrible considering they were around 17ms 12 months ago.

Anyone know where I can find anything better ? The best info I can find at the moment is via the console:

Code:
> adsl status --------------------------- ATU-R Info (hw: annex A, f/w: annex A) ----------- Running Mode : unknown State : SHOWTIME DS Actual Rate : 48352000 bps US Actual Rate : 17176000 bps DS Attainable Rate : 0 bps US Attainable Rate : 0 bps DS Path Mode : Fast US Path Mode : Fast DS Interleave Depth : 0 US Interleave Depth : 0 NE Current Attenuation : 17 dB Cur SNR Margin : 5 dB DS actual PSD : 7. 4 dB US actual PSD : 12. 6 dB ADSL Firmware Version : 05-04-08-00-00-06 -------------------------------- ATU-C Info --------------------------------- Far Current Attenuation : 0 dB Far SNR Margin : 5 dB CO ITU Version[0] : 00004d43 CO ITU Version[1] : 000015a4 DSLAM CHIPSET VENDOR : < unknown > > show status System Uptime:66:24:23 LAN Status Primary DNS:212.159.6.9 Secondary DNS:212.159.6.10 IP Address:192.168.1.1 Tx Rate:12258545 Rx Rate:6688115 WAN 1 Status: Connected Enable:Yes Line:xDSL Name:Plusnet Fibre Mode:PPPoE Up Time:27:13:17 IP:nn.nnn.nnn.nnn GW IP:195.166.128.185 TX Packets:2470872 TX Rate:210 RX Packets:4418427 RX Rate:156 WAN 2 Status: Disconnected Enable:No Line:Ethernet Name: Mode:PPPoE Up Time:0:00:00 IP:--- GW IP:--- TX Packets:0 TX Rate:0 RX Packets:0 RX Rate:0 WAN 3 Status: Disconnected Enable:No Line:USB Name: Mode:--- Up Time:0:00:00 IP:--- GW IP:--- TX Packets:0 TX Rate:0 RX Packets:0 RX Rate:0 VDSL Information: VDSL Firmware Version:05-04-08-00-00-06 Mode:17A State:SHOWTIME TX Block:0 RX Block:0 Corrected Blocks:0 Uncorrected Blocks:0 UP Speed:17176000 Down Speed:48352000 SNR Margin:5 Loop Att.:17

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19 Jul 2013 14:29 #77020 by jedi98
Replied by jedi98 on topic Re: VDSL Modem Data (2860)
I see that you are on plusnet fibre, installed by openreach. In which case, what sort of ping do you get by using the BT openreach VDSL modem on WAN2 instead of the internal one? (seems like a step back but worth a look).

Also, I note in the 2860 downloads page on draytek.co.uk there is a 3.7.3RC4 firmware which talks of improved throughput in the notes. Whether that is relevant is anyone's guess, but again, may be worth looking into.

I get around 17ms ping to my isp web site with 2820 + BT openreach VDSL modem on WAN2, wired. 10ms to the GW IP from the router's status page.

Oh, and 10ms to your GW IP which is interesting but maybe not relevant.

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19 Jul 2013 14:42 #77021 by andyhamp
Replied by andyhamp on topic Re: VDSL Modem Data (2860)
Well it looks like something changed overnight as ping times have come down ... about 22ms now to the gateway.

I think the DLAM management has reduced the interleaving. Still could be better i was getting 12-14ms on ADSL .... which is hugely frustrating as my FTTC cabenet is only about 140 meters by road, where as the exchange was significantly further c 1km

I guess i'll have to leave it alone and wait a while to see if it gets improved some more.

Andy

PS ... Already running the RC4 firmware

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20 Jul 2013 01:44 #77026 by admin
Replied by admin on topic Re: VDSL Modem Data (2860)
Why do you care about your ping speeds?

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21 Jul 2013 09:55 #77030 by andyhamp
Replied by andyhamp on topic Re: VDSL Modem Data (2860)

admin wrote: Why do you care about your ping speeds?


Seems a strange question .....

Why ? Because latency effects overall performance. Even if you're simply downloading a big file it will increase the amount of time to download. Take an example of a FTP download ... because the way FTP works each packet has to be acknowledged with a big file 15ms v 35ms can make a big difference. Other applications, online gaming are all effected in some way.

Why would you not care about latency ? IMHO it's almost more important that just the headline bandwidth ....

Andy "happy to be proved wrong" Hampshire

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21 Jul 2013 15:32 #77036 by admin
Replied by admin on topic Re: VDSL Modem Data (2860)
I didn't mean you didn't have a reason, I was just wondering what it was. The common reason I've seen is the time taken to shoot someone in the head in an online game :-) I'm not sure how much difference it would make to FTP typically though in itself. It will also depend on the packet size, but also each hop's own latency, packet loss at any given node. I'm not familiar with how FTP actually works, in whether it waits for an ACK for every packet before sending the next, or it uses 'sliding windows' and resends things out of order if needed.

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