VII. Router Diagnostics

On DrayTek routers with ADSL / VDSL modems, it is possible to check whether the line is using an Interleaved profile or Fast profile. Interleaving is a method of error correction used on DSL lines; an interleaved profile can be applied to a line to improve resilience (as opposed to a 'fast' profile) to burst of errors. Interleaving can add additional latency of up to 40ms depending on the maximum interleave depth that has been enabled on the line profile.

To check which profile type your xDSL line is using, access the telnet interface of the router, please do the following (assuming  the  router IP is 192.168.1.1, also please remove " quotes):

1. On Windows, Go to the Start menu, select Run and on there type "cmd" and click OK,  or  if  the  Run  option is not present, type "cmd" in the "Start Search" textbox above the Start button and press enter.  For other OSs there will be an equivalent telnet program or app.
2. Type "telnet 192.168.1.1"
3. Enter the username of "admin", press enter, then enter the password for the router.
4. Enter "vdsl status" (or "adsl status" for an ADSL connection)

This will show the following output if it's an Interleaved line profile:

> vdsl status
  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
   Running Mode            :      17A       State                : SHOWTIME
   DS Actual Rate          : 59977000 bps   US Actual Rate       : 12029000 bps
   DS Attainable Rate      : 69832240 bps   US Attainable Rate   : 14284000 bps
   DS Path Mode            :  Interleave    US Path Mode         :  Interleave
   DS Interleave Depth     :      874       US Interleave Depth  :      253
   NE Current Attenuation  :       19 dB    Cur SNR Margin       :        6  dB
   DS actual PSD           :     7. 7 dB    US actual PSD        :    13. 2   dB
   NE CRC Count            :        0       FE CRC Count         :      409
   NE ES Count             :        0       FE  ES Count         :       18
   Xdsl Reset Times        :        0       Xdsl Link  Times     :        9
   ITU Version[0]          : b5004946       ITU Version[1]       : 544e0000
   VDSL Firmware Version   : 05-06-07-05-01-07   [with Vectoring support]
   Power Management Mode   : DSL_G997_PMS_L0
   Test Mode               : DISABLE
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :        0 dB    Far SNR Margin       :        5  dB
   CO ITU Version[0]       : b5004244       CO ITU Version[1]    : 434da44f
   DSLAM CHIPSET VENDOR    : < BDCM >
>

Note that the DS Path Mode and US Path Mode both show Interleave and it shows the DS/US Interleave Depth below that.

If it's a Fast line profile, it will show line stats similar to this:

> vdsl status
  ---------------------- ATU-R Info (hw: annex A, f/w: annex A/B/C) -----------
   Running Mode            :      17A       State                : SHOWTIME
   DS Actual Rate          : 69449000 bps   US Actual Rate       : 14234000 bps
   DS Attainable Rate      : 70197776 bps   US Attainable Rate   : 14245000 bps
   DS Path Mode            :        Fast    US Path Mode         :        Fast
   DS Interleave Depth     :        1       US Interleave Depth  :        1
   NE Current Attenuation  :       19 dB    Cur SNR Margin       :        6  dB
   DS actual PSD           :     7. 8 dB    US actual PSD        :    13. 3   dB
   NE CRC Count            :        0       FE CRC Count         :      619
   NE ES Count             :        0       FE  ES Count         :       39
   Xdsl Reset Times        :        0       Xdsl Link  Times     :       10
   ITU Version[0]          : b5004946       ITU Version[1]       : 544e0000
   VDSL Firmware Version   : 05-06-07-05-01-07   [with Vectoring support]
   Power Management Mode   : DSL_G997_PMS_L0
   Test Mode               : DISABLE
  -------------------------------- ATU-C Info ---------------------------------
   Far Current Attenuation :        0 dB    Far SNR Margin       :        6  dB
   CO ITU Version[0]       : b5004244       CO ITU Version[1]    : 434da41b
   DSLAM CHIPSET VENDOR    : < BDCM >
>

Note that the DS/US Path Mode both show Fast and the Interleave Depth is 1 for both directions, which indicates that there is no interleaving in use on the line.

Type "exit" at the telnet prompt to close the session.

To check if your line is using G.INP instead, see this guide.

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