ADSL2+ Modem stats /proc (Line Attenuation/Margin)?

Hi!

I am currently looking into an upgrade of my ADSL connection,
which isn't switched so far, but I bought already a modem for a
few bucks (ebay). My old wasn't capable of ADSL2+ at all.

To my surprise the modem, which can be used as router or just
modem in bridge mode is running Linux. ;-)

# cat /proc/version
Linux version 2.4.17_mvl21-malta-mips_fp_le ((E-Mail Removed))
(gcc version 2.95.3 20010315 (release/MontaVista)) #2 Mon Nov 21
14:53:11 CST 2005

# cat /proc/cpuinfo
processor : 0
cpu model : MIPS 4KEc V4.8
BogoMIPS : 149.91
wait instruction : no
microsecond timers : yes
extra interrupt vector : yes
hardware watchpoint : yes
VCED exceptions : not available
VCEI exceptions : not available

You can login via web interface, ssh and it even supports snmp.
Some stats can be gathered from /proc:

# cat /proc/avalanche/avsar_modem_stats

AR7 DSL Modem Statistics:
--------------------------------
[DSL Modem Stats]
US Connection Rate: 640 DS Connection Rate: 6656
DS Line Attenuation: 9 DS Margin: 13
US Line Attenuation: 6 US Margin: 21
[..]

Speed values correspond to my former connection, so it hasn't
been switched. My ISP told me they'd switch in the next days.

However, I am looking for a more complete explanation (URL) of
"DS/US Line Attenuation" and "DS/US Margin", from looking it
seems at least line attenuation is outstanding (should correspond
to the distance to the DSLAM) and should deliver good ADSL2+
connection rates once the line is switched?

[ Followup-To -> comp.os.linux.networking ]

--
Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
mail: echo (E-Mail Removed) | perl -pe 'y/a-z/n-za-m/'
#bofh excuse 234: Someone is broadcasting pygmy packets and
the router doesn't know how to deal with them.

In comp.os.linux.networking Michael Heiming <michael+(E-Mail Removed)>:

> I am currently looking into an upgrade of my ADSL connection,
> which isn't switched so far, but I bought already a modem for a
> few bucks (ebay). My old wasn't capable of ADSL2+ at all.

> To my surprise the modem, which can be used as router or just
> modem in bridge mode is running Linux. ;-)
[..]

> # cat /proc/avalanche/avsar_modem_stats

> AR7 DSL Modem Statistics:
> --------------------------------
> [DSL Modem Stats]
> US Connection Rate: 640 DS Connection Rate: 6656
> DS Line Attenuation: 9 DS Margin: 13
> US Line Attenuation: 6 US Margin: 21
> [..]

> Speed values correspond to my former connection, so it hasn't
> been switched. My ISP told me they'd switch in the next days.

> However, I am looking for a more complete explanation (URL) of
> "DS/US Line Attenuation" and "DS/US Margin", from looking it
> seems at least line attenuation is outstanding (should correspond
> to the distance to the DSLAM) and should deliver good ADSL2+
> connection rates once the line is switched?

OK, found the answer:

http://www.dslreports.com/faq/6734

"How do I check modem statistics/event logs? What do the numbers
mean? (#6734)"

- DS/US Margin means SN Margin (Signal to Noise Ratio)
- DS/US Line Attenuation, what it says, how much the signal has
degraded between DSLAM and modem.

DS/US margin should change after speed is going to be switched.
DS/US Line Attenuation should stay the same unless moving the
house.

--
Michael Heiming (X-PGP-Sig > GPG-Key ID: EDD27B94)
mail: echo (E-Mail Removed) | perl -pe 'y/a-z/n-za-m/'
#bofh excuse 307: emissions from GSM-phones