puzzled by upstream and downstream rates

[#1]

I'm not quite sure what's going on with my connection.
All of a sudden, the rates I'm seeing reported by my router are not ones that I'm used to seeing.
A week ago, I had an attenuation of -62dB, my downstream rates were all nice even numbers between 1728 and 2272-ish.
My upstream rate was... I think... 448 or something.
Now I'm seeing odd values for the downstream rates, like 1963.  And my upstream rate is 450.  My attenuation has changed to -65dB on this router and -70dB on another.
I'm at a loss to explain why the values are not as consistent as before.  I may just be seeing things, but can somebody explain why these odd numbers have occurred?
Thanks.
-- gyre --

[#2]

I can't comment about the exact values of your numbers but I would have thought the speeds you achieve are very good for the amount of attenuation you have.

[#3]

It is possible that a wire/filter has deteriorated.
Can you check with another connecting cable and filter in the test socket

[#4]

Thanks for replying folks.
Changed wire.
Changed filter and used test socket.
No change in reported values.
Just looks like the overall stats have taken a turn for the worst. 
However, my question was more... why the non-even/non-448 numbers as opposed to why have the figures got far worse.
-- gyre --

[#5]

There is no need for the numbers to be even, you just need to compare the absolute values.
If the upstream is anything lower than 448kbps then this indicates a problem, possibly a voice line fault that's crossing over into the broadband
If the downstream is degrading then this suggests a broadband line fault.
http://faults.plus.net please.

[#6]

/evil thought
Have you been moved to 21CN which will affect the attenuation
Can you post the stats from your router

[#7]

I was moved to 21CN earlier in the year.  However, I *think* I'm still on the old BBYW 3 package.  I *think* this means I'm still on ADSL and not ADSL 2 or whatever.  Although it's possible something's changed in the last week behind my back when I asked for interleaving to be switched back on.
See what you can make of these stats, anyway.

# cat /proc/avalanche/avsar_modem_stats
AR7 DSL Modem Statistics:
--------------------------------
[DSL Modem Stats]
        US Connection Rate:     450     DS Connection Rate:     1999
        DS Line Attenuation:    65      DS Margin:              9
        US Line Attenuation:    42      US Margin:              10
        US Payload :            4334544 DS Payload:             7919472
        US Superframe Cnt :     111943  DS Superframe Cnt:      111943
        US Transmit Power :     0       DS Transmit Power:      0
        LOS errors:             0       SEF errors:             0
        Errored Seconds:        4       Severely Err Secs:      1
        Frame mode:             0       Max Frame mode:         0
        Trained Path:           1       US Peak Cell Rate:      1061
        Trained Mode:           16      Selected Mode:          1
        ATUC Vendor Code:       54535443        ATUC Revision:  3
        Hybrid Selected:        1       Trellis:                1
        Showtime Count:         3       DS Max Attainable Bit Rate: 2196 kbps
        BitSwap:                1       US Max Attainable Bit Rate: 858270 bps
        Annex:                  AnxA    psd_mask_qualifier: 0x0000
        Power Management Status: L0     DS HLINSC: 0
        US ACTPSD:              -345    DS ACTPSD: -366
        Total init. errors:     2       Total init. timeouts: 0
        Showtime init. errors:  0       Showtime init. timeouts: 0
        Last showtime init. errors: 1   Last showtime init. timeouts: 0
        ATUC ghsVid:  b5 00 54 53 54 43 05 10
        T1413Vid: 00 00         T1413Rev: 00            VendorRev: 00
        ATUR ghsVid:  b5 00 54 53 54 43 00 00
        T1413Vid: 00 00 T1413Rev: 00    VendorRev: 00
        [Upstream (TX) Interleave path]
        CRC:    0       FEC:    0       NCD:    0
        LCD:    0       HEC:    0
        [Downstream (RX) Interleave path]
        CRC:    3       FEC:    735     NCD:    0
        LCD:    0       HEC:    0
        [Upstream (TX) Fast path]
        CRC:    0       FEC:    0       NCD:    0
        LCD:    0       HEC:    0
        [Downstream (RX) Fast path]
        CRC:    0       FEC:    0       NCD:    0
        LCD:    0       HEC:    0
[ATM Stats]
        [Upstream/TX]
        Good Cell Cnt:  90303
        Idle Cell Cnt:  1929423
        Tx Packets Dropped Count:       0
        Tx Bad Packets Count:   207
        [Downstream/RX)]
        Good Cell Cnt:  164989
        Idle Cell Cnt:  8809768
        Bad Hec Cell Cnt:       10
        Overflow Dropped Cell Cnt:      0
        Rx Packets Dropped Count:       0
        Rx Bad Packets Count:   0

[SAR AAL5 Stats]
        Tx PDU's:       1421266
        Rx PDU's:       2148425
        Tx Total Bytes: 161917278
        Rx Total Bytes: 3040891578
        Tx Total Error Counts:  0
        Rx Total Error Counts:  44

[OAM Stats]
        Near End F5 Loop Back Count:    0
        Near End F4 Loop Back Count:    0
        Far End F5 Loop Back Count:     0
        Far End F4 Loop Back Count:     0
        SAR OAM Ping Response Drop Count=0
# 

[#8]

You're on ADSL1 in 21CN and are doing well to have a 2mbps sync on a 65dB line.

[#9]

The upstream attenuation seems a bit high but unless there is noise on the line (quiet line test 17070 option 2) then you are stuck with it.
Why it is synching at 450kbps I have absolutely no idea
Note that moving from 20CN to 21CN involves connecting to a different piece of equipment in the exchange which may well affect the reported attenuation

[#10]

No sound on line on quiet line test that I could detect with my ears.
Yup, I don't know why the 450.  I swear it has always been 448 for years, even when I moved to 21CN.
Actually, when I did move to 21CN earlier in the year, the downstream attenuation went from 63 or 65dB to 62.  It has only just shot back up to 65 again.
I have actually synced at over 2300kbps when the target snr margin was 6dB.  But it went up to 9dB a while back after using a stupid 2wire modem and has never come down again
-- gyre --

[#11]

I switched over to a Speedtouch 585v7 and had the following stats:

adsl info expand=enabled
Modemstate                   :  Up 
xDSL Type                    :  ADSL2+
xDSL Standard                :  ITU-T G.992.5
xDSL Annex                   :  Annex A
Uptime (days hh:mm:ss)       :  0 days, 0:03:28 
Number of resets             :  1 
Total Available Bandwidth           Cells/s           kbit/s 
  Downstream                 :      4561             1934 
  Upstream                   :       778              330 
Bearer Generic Info               Downstream        Upstream 
INP          (DMT)           :         1.20             2.37
Delay        (ms)            :         7.93             5.33
R                            :        10                8
Margin       (dB)            :        10.0              5.5 
Attenuation  (dB)            :        69.0             42.0 
OutputPower  (dBm)           :        17.0             11.5 
Vendor Chipset                      Local            Remote
  Country                    :      B500             B500 
  Vendor                     :      BDCM             TSTC 
  VendorSpecific             :      0000             0510 
  StandardRevisionNr         :        00               63 
Vendor System
  Country                    :      0F00             0000 
  Vendor                     :      TMMB             ---- 
  VendorSpecific             :      3C61             0000 
  StandardRevisionNr         :        00               00 

Transfer statistics
    Errors 
      Received FEC           :        12 
      Received CRC           :         0 
      Received HEC           :         0 
      Transmitted FEC        :         0 
      Transmitted CRC        :         0 
      Tranmsitted HEC        :    167464 
     Near end failures since reset
      Loss of frame          :         0 failures 
      Loss of signal         :         0 failures 
      Loss of power          :         0 failures 
      Errored seconds        :         0 seconds  
     Near end failures last 15 minutes
      Loss of frame          :         0 seconds 
      Loss of signal         :         0 seconds 
      Loss of power          :         0 seconds 
      Errored seconds        :         0 seconds 
     Near end failures current day 
      Errored seconds        :         0 seconds 
     Near end failures previous day 
      Errored seconds        :         0 seconds 
{admin}=

I think I've been moved to ADSL2 somehow.
-- gyre --

[#12]

If I am reading the stats correctly - I don't
Your upstream sync had dropped to 330kbps with a noise margin of 5.5dB

[#13]

Yup, I agree.  However, the adsl type was adsl2+.
I was able to force the router to use adsl1, and got the following stats:

adsl info expand=enabled
Modemstate                   :  Up 
xDSL Type                    :  ADSL
xDSL Standard                :  ITU-T G.992.1
xDSL Annex                   :  Annex A
Channel Mode                 :  Interleaved 
Uptime (days hh:mm:ss)       :  0 days, 0:02:04 
Number of resets             :  3 
Total Available Bandwidth           Cells/s           kbit/s 
  Downstream                 :      5056             2144 
  Upstream                   :      1056              448 
Bearer Generic Info               Downstream        Upstream 
Margin       (dB)            :         9.5             14.0 
Attenuation  (dB)            :        63.5             31.5 
OutputPower  (dBm)           :        17.5             12.0 
Vendor Chipset                      Local            Remote
  Country                    :      B500             B500 
  Vendor                     :      BDCM             TSTC 
  VendorSpecific             :      0000             0510 
  StandardRevisionNr         :        00               63 
Vendor System
  Country                    :      0F00             0000 
  Vendor                     :      TMMB             ---- 
  VendorSpecific             :      3C61             0000 
  StandardRevisionNr         :        00               00 

Transfer statistics
    Errors 
      Received FEC           :         8 
      Received CRC           :         0 
      Received HEC           :         0 
      Transmitted FEC        :         0 
      Transmitted CRC        :         0 
      Tranmsitted HEC        :         0 
     Near end failures since reset
      Loss of frame          :         0 failures 
      Loss of signal         :         0 failures 
      Loss of power          :         0 failures 
      Errored seconds        :         0 seconds  
     Near end failures last 15 minutes
      Loss of frame          :         0 seconds 
      Loss of signal         :         0 seconds 
      Loss of power          :         0 seconds 
      Errored seconds        :         0 seconds 
     Near end failures current day 
      Errored seconds        :         0 seconds 
     Near end failures previous day 
      Errored seconds        :         0 seconds 
{admin}=

Which looks pretty much what I used to get before the oddities started happening this week.
-- gyre --

[#14]

What do you think Ben?  Somehow getting ADSL2+?  Not that I mind, but it isn't like I can take any advantage of it
-- gyre --

[#15]

Hmmmm, strange. We definitely ordered ADSL1 but I know ADSL2+ customers can enforce a sync on ADSL2 or ADSL1. Perhaps the reverse is true?