Router stats for a VDSL2 line

I would be grateful if someone could comment on the following set of DSL stats obtained from a Draytek Vigor 2860 router on a BT VDSL2 line , where the fibre cabinet is about 30 metres away.

Is there anything unusual about any value? Even better, is there somewhere where I can look up what the important values mean?

Apologies for the horrible layout - I don't know of a way to put the table as a 'real' table, in a monospaced font...

LINE STATISTICS for VDSL2 line on Draytek 2860 router

Downstream Upstream
---------- --------
Actual Rate 79995 Kbps 20000 Kbps
Attainable Rate 109995 Kbps 31354 Kbps
Path Mode Fast Fast
Interleave Depth 1 1
Actual PSD -5.-3 dB -5.-3 dB

Near Far
End End
--- ---
Trellis ON ON
Bitswap ON OFF
ReTx 0 0
SNR Margin 14 dB 12 dB
Attenuation 5 dB 4 dB
CRC 0 95
FECS 14 s 1024 s
ES 0 s 77 s
SES 0 s 0 s
LOSS 0 s 19 s
UAS 34 s 231346 s
HEC Errors 0 0
RS Corrections 0 0
LOS Failure 0 0
LOF Failure 0 0
LPR Failure 0 0
NCD Failure 0 0
LCD Failure 0 0
NFEC 255 255
RFEC 16 16
LYSMB 5410 21451

In reply to a post by John_Gray:

Downstream Upstream
---------- --------
Actual Rate 79995 Kbps 20000 Kbps
Attainable Rate 109995 Kbps 31354 Kbps
Path Mode Fast Fast
Interleave Depth 1 1

Near Far
End End
--- ---
SNR Margin 14 dB 12 dB
Attenuation 5 dB 4 dB

Looks very good on a very short line.

Near Far
End End
--- ---
Bitswap ON OFF

Looks odd. Why would bitswap be off on upstream?
[edit] although a quick look at mydslwebstats shows not much bitswapping going on

Edited by deleted (Fri 13-Jan-17 09:05:58)

In reply to a post by John_Gray:

I would be grateful if someone could comment on the following set of DSL stats obtained from a Draytek Vigor 2860 router on a BT VDSL2 line , where the fibre cabinet is about 30 metres away.

Is there anything unusual about any value? Even better, is there somewhere where I can look up what the important values mean?

Nothing unusual about those.

You say 30m to the fibre cabinet which itself is not a totally useful measurement unless it is an AIO. What is the distance from you to the original PCP? and is there a pole? Then how far from PCP to fibre cab?

As per BatBoy's reply, but I would add the the bulk of your stats are to do with error figures, and those need to be looked at in relation to the uptime. Is there an "AS" line, which is the number of seconds? Or is there a simple uptime figure showing it in normal hh:mm:ss notation?

Where do the many "s"s come from? They are distracting and look to me as though you have added them. On most of the lines they are present the "S" at the end of the label is "seconds", and on some lines the small "s" is inappropriate.

For instance, FECs is a number, not a time. As in Forward Error Corrections. LOSS is surely Loss of Signal, again an occurrence counter? (Edit - I see the Loss of Signal line lower down so no idea what LOSS is).

Edited by RobertoS (Fri 13-Jan-17 10:58:22)

@BatBoy: thanks for the comments!

@MHC: "You say 30m to the fibre cabinet which itself is not a totally useful measurement unless it is an AIO. What is the distance from you to the original PCP? and is there a pole? Then how far from PCP to fibre cab? "

Unfortunately I don't know the meaning of any of your initialisms! I presume the path of the copper wires is from the fibre cabinet (as I call it), underneath a small road and associated pavements in a small town, and then into the premises. The actual length of copper wire is undoubtedly somewhat greater than 30 metres (which was my 'as the crow flies' figure) but I have no way of determining this. I didn't see any pole (but there again, I wasn't looking!)

@RobertoS: the UpTime at which the DSL figures were obtained is about 47 hours (the DSL stats page doesn't include a time). The 's's (all lower-case) are on the DSL stats page itself, separated by a tab from the preceding numeric field. I presume they mean 'seconds'? Since I have no idea what the names mean, I don't know if 'seconds' is a meaningful concept in those cases where it's shown.

Summarising your responses, it seems that this new line is in good nick!

Your connection will be:

The voice comes from the exchange to the original cabinet (Primary Connection Point - PCP). A link then takes that to the fibre cabinet which has a fibre feed and where voice and data are combined. This is the "start" of your copper pair based data connection. The combined signal is then fed back to the PCP and from there it goes under the roads and pavements to your premises.

So, the distance is you to PCP + PCP to Fibre Cab. and yes, it can meander although in your case, not by much.

In a small number of locations there are All-In-One cabinets which house both the PCP and Fibre cab functionality in once unit.

Reason I asked is that it would be nice to know what line lenghth (approx) gives a 5dB attenuation.



Premises, into street and under roads and pavements to the ORIGINAL green cabinet and then from that cabinet to the fibre cabinet which is where the voice and data connections come to

How weird re the "s"s . No matter!

As you gathered, at the moment the stats look good. However, if it is a new cabinet and you are one of the first on it, you can expect the Attainable Rate to fall considerably (from crosstalk where wires from other lines are close to yours) as other people take up FTTC on the same cabinet. It's unlikely to result in your actual rate falling, but error rates may increase.

Oh, and a slight oddity. The FECs line looks decidedly strange, given that related lines such as the Fast/Fast; interleaving depth 1/1 and RS Corrections 0/0. I would expect the FECs also to be 0/0.

It's possible the Vigor has a slight bug in the GUI (screen presentation - Graphical User Interface). If you know how to run telnet it would be a good idea to obtain stats that way to confirm.

@MHC: thank you for the explanation. The PCP and the Fibre Cabinet are within a couple of metres of each other. The Fibre Cabinet has been in situ for a couple of years, I think,

@RobertoS: there doesn't seem to be a Draytek Telnet command which gives similar information to the GUI whose output I have posted earlier. The closest I can find is SHOW ADSL (yes!), and I can't seem to capture its output from the Command Prompt Window.

It wouldn't surprise me that there are several bugs in the Draytek router GUI!
Windows used to require a reboot when you made config changes - but the 2860 needs far more, especially when configuring LAN-LAN connections...

On the Draytek Vigor 130, once you are at the Command Prompt and have a telnet connection, on the Draytek Vigor 130 it is:-

xdslctl info --stats

for the full error reports version, and :-

xdslctl info --show

for the stats with summary error reports version.

Might be worth a try.

The Draytek Vigor 2860 includes its own modem code, so there is no need for a Draytek 130 modem.

I can't find any telnet commands starting xdsl... in the Draytek Command Line Reference manual V.1.12 (Updated May 2016)

I cited the 130 because manufacturers tend to have the same telnet interface across all their kit . IIRC the SHOW one you gave also works with the 130, but no more use than the GUI.

Have you tried either of mine? If one works so will the other, it's only the time breakdown of error stats that differ. Neither will crash the thing .

TELNET results

Account:admin
Password: *************

User login successful, expired time is "Unlimited".

> xdslctl info --stats
% Command missing, Valid commands are:
adsl vdsl bpa csm ddns dos
exit internet ip ip6 ipf log
ldap tacacsplus mngt msubnet object port
portmaptime ppa prn qos quit show
smb srv switch sys testmail fs
upnp usb vigbrg vlan vpn wan
wptl radius local_8021x wol user appqos
nand apm sfp ethoam ha swm

>

Ah well.

Rather than using the XDSL command try using VDSL info or VDSL which the valid command list suggests.

To enlarge on Robertos's explanation, I can actually see inside the FTTC (when open - rarely) from my lounge window, about 10 Metres apart.

The FTTC in turn is about 40 Metres from the PCP; but the link cable is about 50 Metres long, as it first heads 5 M away from the PCP direction in a short section of new duct to enter the old main duct from the exchange to the PCP, hence the extra 10 M, before turning about to pass the FTTC onwards to the PCP.

The big conundrum is the 1967 phone wiring from the PCP to my house on a then green-field site, no obvious obstructions etc.

Yet the phone wire length from the PCP to my house is a known 250 Metres, as that wiring has been clearly identified many years back at a small junction block on the foundations of another house about 125 M away, when locating a fault in dial-up days.

Virtually all of it is underground, so no poles to help confirm the route.

@MHC: this is the result of VDSL STATUS, using the code and /code feature!
The router has been 'up' for just over 167 hours.

Text

1 23 45 67 89 1011 1213 1415 1617 1819 20

> vdsl status   ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------   Running Mode            :      17A       State                : SHOWTIME    DS Actual Rate          : 79995000 bps   US Actual Rate       : 20000000 bps   DS Attainable Rate      :109864200 bps   US Attainable Rate   : 31270312 bps    DS Path Mode            :        Fast    US Path Mode         :        Fast   DS Interleave Depth     :        1       US Interleave Depth  :        1    NE Current Attenuation  :        5 dB    Cur SNR Margin       :       14  dB   DS actual PSD           :    -5.-3 dB    US actual PSD        :    -5.-3  dB    NE CRC Count            :        0       FE CRC Count         :      221   NE ES Count             :        0       FE  ES Count         :      184    Xdsl Reset Times        :        0       Xdsl Link  Times     :        1   ITU Version[0]          : b5004946       ITU Version[1]       : 544e0000    VDSL Firmware Version   : 05-07-06-0D-01-07   [with Vectoring support]   Power Management Mode   : DSL_G997_PMS_L0    Test Mode               : DISABLE  -------------------------------- ATU-C Info ---------------------------------    Far Current Attenuation :        4 dB    Far SNR Margin       :       12  dB   CO ITU Version[0]       : b5004946       CO ITU Version[1]    : 544eb206    DSLAM CHIPSET VENDOR    : < IFTN >

Edited by John_Gray (Wed 18-Jan-17 07:02:40)