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SNR stuck at 9dB

dmk001
Member

I was told to leave my router connected for 72 hours and DLM would change my SNR to 6dB but it jasn't changed. I haven't been disconnected recently and my connection can handle 3dB. It only increased because of a storm a while back.

 

Here are my stats:

adsl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 17178 Kbps, Downstream rate = 17488 Kbps
Path:   0, Upstream rate = 968 Kbps, Downstream rate = 14355 Kbps

Link Power State:       L0
Mode:                   ADSL2+
TPS-TC:                 ATM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        9.2             5.5
Attn(dB):        26.0            13.7
Pwr(dBm):        21.1            12.1
                        ADSL2 framing
MSGc:           51              14
B:              254             121
M:              1               1
T:              2               1
R:              0               0
S:              0.5672          4.0000
L:              3596            244
D:              1               1
                        Counters
SF:             17966320                263324
SFErr:          2178            16141
RS:             0               0
RSCorr:         0               0
RSUnCorr:       0               0

HEC:            1666            10983
OCD:            134             0
LCD:            0               0
Total Cells:    1245024651              663152135
Data Cells:     611448427               86446980
Drop Cells:     2380682
Bit Errors:     0               984067

ES:             1616            15430
SES:            8               0
UAS:            18              18
AS:             290479

INP:            0.00            0.00
PER:            16.16           20.00
delay:          0.14            1.00
OR:             28.20           8.00

Bitswap:        11304           6334

Since Link time = 3 days 8 hours 41 min 19 sec
FEC:            0               0
CRC:            2178            16141
ES:             1616            15430
SES:            8               0
UAS:            0               0
LOS:            0               0
LOF:            0               0

 Is it possible that my SNR is stuck?

3 REPLIES 3

wbasker
Member

Hello dmk001,

 

Generally speaking a SNR of around 6db is ideal for the broadband to work, though depending on line length and equipment on the connection (routers, PSTN items etc...) a SNR variation of 3db either way is OK for the broadband to work.

 

You mentioned that a storm has came your way a while back - since then has the connection got a lot worse? Do you experience slow speeds or drop outs?

 

When it comes to routers / modems being on the connection at hand, we generally advise customers to keep them connected, switched on - as if the exchange picks up it going off every day - it can detect wither it is dropping due to a fault or wither it is being switched off every night- that is no doubt you where advised to leave it connected for 72 hours.

 

Have you tried changing your ADSL Microfilter? Do you have extensions? The telephone point that the modem / router is connected to - does it have a removable bottom half that you can take off by remove the screws? If so, on the bottom right hand side, there is a test socket - try plugging the filter into that and monitor.

 

These are some basic things you can try yourself to see if the connection improves, stay's the same or gets worse.

 

If it does not get better, you can always Contact Us

-------------------------
In order to begin solving issues, we need to strip the situation down to it's basic issue / problem and start from the start. Then we can start looking into the complexities of it.

I am here to help!

dmk001
Member

Another thing as well in between 8pm - 12am Xbox is impossible to play because I get huge amounts of packet loss. I would of though that business connections would of had priority however this seems not to be the case. I've had so many problems with BT I'm thinking about leaving going to a more reliable provider. This problem is very recent, it started happening 3 days ago and has been continuous since then. Latency has also increased from 12ms to 16ms sometimes jumping to 21ms somedays, the problem has only occured when the latency increased.

 

I've provided some traceroutes from my connection and to my connection:

Tracing route to bbc.co.uk [212.58.251.195]
over a maximum of 30 hops:

  1     1 ms    <1 ms    <1 ms  home.gateway.home.gateway [192.168.1.254]
  2    17 ms    18 ms    16 ms  host81-148-0-1.in-addr.btopenworld.com [81.148.0
.1]
  3    17 ms    16 ms    16 ms  213.120.178.141
  4    18 ms    18 ms    18 ms  213.120.177.98
  5    18 ms    17 ms    17 ms  217.41.168.177
  6    17 ms    18 ms    17 ms  217.41.168.107
  7    17 ms    17 ms    17 ms  109.159.249.68
  8    23 ms    23 ms    23 ms  core1-te0-15-0-4.faraday.ukcore.bt.net [109.159.
249.29]
  9    17 ms    18 ms    18 ms  peer2-xe8-0-0.telehouse.ukcore.bt.net [109.159.2
54.177]
 10    18 ms    17 ms    18 ms  194.74.65.42
 11     *        *        *     Request timed out.
 12     *        *        *     Request timed out.
 13    18 ms    19 ms    17 ms  ae0.er01.telhc.bbc.co.uk [132.185.254.109]
 14    18 ms    18 ms    18 ms  132.185.255.140
 15    19 ms    19 ms    19 ms  www-vip.telhc.bbc.co.uk [212.58.251.195]

 

 1  2ms    RS-Gateway.local [78.129.174.1]
 2  0ms    87.117.211.45
 3  1ms    593.core1.thn.as20860.net [62.233.127.173]
 4  1ms    linx1.ukcore.bt.net [195.66.224.10]
 5  9ms    core1-te0-8-0-2.faraday.ukcore.bt.net [109.159.254.180]
 6  1ms    acc2-10GigE-0-4-0-0.l-far.21cn-ipp.bt.net [109.159.249.128]
 7  2ms    109.159.249.226
 8  2ms    217.41.168.108
 9  2ms    217.41.168.190
10  1ms    213.120.177.101
11  2ms    213.120.178.145
12   *     Request timed out.
13  17ms   host81-xxx-xxx-xxx.in-addr.btopenworld.com [81.xxx.xxx.xxx]

 Both traceroutes show an increase in latency at Faraday

 

Usually when the connection is normal:

Tracing route to bbc.co.uk [212.58.253.67]
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms  home.gateway.home.gateway [192.168.1.254]
  2    14 ms    13 ms    13 ms  host81-139-128-1.in-addr.btopenworld.com [81.139
.128.1]
  3    13 ms    13 ms    13 ms  213.120.178.141
  4    14 ms    14 ms    14 ms  213.120.177.98
  5    15 ms    13 ms    13 ms  217.41.168.177
  6    14 ms    14 ms    14 ms  217.41.168.107
  7    14 ms    14 ms    14 ms  109.159.249.110
  8    14 ms    14 ms    14 ms  core2-te0-7-0-16.faraday.ukcore.bt.net [109.159.
249.9]
  9    15 ms    15 ms    14 ms  peer2-xe8-3-1.telehouse.ukcore.bt.net [213.121.1
93.111]
 10    14 ms    14 ms    14 ms  194.74.65.42
 11     *        *        *     Request timed out.
 12    15 ms    14 ms    15 ms  ae0.er01.cwwtf.bbc.co.uk [132.185.254.93]
 13    15 ms    16 ms    16 ms  132.185.255.156
 14    15 ms    16 ms    15 ms  www-vip.cwwtf.bbc.co.uk [212.58.253.67]

Trace complete.

 

 1  0ms    RS-Gateway.local [78.129.174.1]
 2  0ms    87.117.211.45
 3  1ms    593.core1.thn.as20860.net [62.233.127.173]
 4  1ms    linx1.ukcore.bt.net [195.66.224.10]
 5  1ms    core1-te0-8-0-2.faraday.ukcore.bt.net [109.159.254.180]
 6  2ms    acc2-10GigE-0-4-0-0.l-far.21cn-ipp.bt.net [109.159.249.128]
 7  2ms    109.159.249.226
 8  2ms    217.41.168.108
 9  2ms    217.41.168.190
10  1ms    213.120.177.101
11  1ms    213.120.178.148
12  13ms   host81-xxx-xxx-xxx.in-addr.btopenworld.com [81.xxx.xxx.xxx]

No increased latency at Faraday and no packet loss when the connection is normal

dmk001
Member

Connection has got even worse just hitting about 1meg on speedtest to various servers including the BT speedtester included another traceroute which shows a huge latency spike:

 

Tracing route to bbc.co.uk [212.58.253.67]
over a maximum of 30 hops:

  1    <1 ms    <1 ms    <1 ms  home.gateway.home.gateway [192.168.1.254]
  2    13 ms    12 ms    13 ms  host81-148-64-1.in-addr.btopenworld.com [81.148.
64.1]
  3    13 ms    13 ms    13 ms  213.120.178.141
  4    14 ms    13 ms    13 ms  213.120.177.98
  5    14 ms    14 ms    13 ms  217.41.168.177
  6    234 ms   271 ms   256 ms 217.41.168.107
  7    14 ms    14 ms    14 ms  acc1-10GigE-0-2-0-6.l-far.21cn-ipp.bt.net [109.1
59.249.101]
  8    15 ms    15 ms    15 ms  core2-te0-7-0-16.faraday.ukcore.bt.net [109.159.
249.9]
  9    14 ms    14 ms    13 ms  peer2-xe8-3-1.telehouse.ukcore.bt.net [213.121.1
93.111]
 10    14 ms    14 ms    15 ms  194.74.65.42
 11     *        *        *     Request timed out.
 12    16 ms    16 ms    19 ms  ae0.er01.cwwtf.bbc.co.uk [132.185.254.93]
 13    16 ms    16 ms    15 ms  132.185.255.156
 14    16 ms    16 ms    16 ms  www-vip.cwwtf.bbc.co.uk [212.58.253.67]

Trace complete.

 

Seems BT don't care anymore tried calling etc.

 

 

adsl: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Max:    Upstream rate = 18426 Kbps, Downstream rate = 21752 Kbps
Path:   0, Upstream rate = 1040 Kbps, Downstream rate = 18788 Kbps

Link Power State:       L0
Mode:                   ADSL2+
TPS-TC:                 ATM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        3.1             6.1
Attn(dB):        26.0            13.7
Pwr(dBm):        16.3            12.1
                        ADSL2 framing
MSGc:           51              14
B:              223             130
M:              1               1
T:              3               1
R:              0               0
S:              0.3809          4.0000
L:              4704            262
D:              1               1
                        Counters
SF:             449036          365662
SFErr:          39590           73
RS:             0               0
RSCorr:         0               0
RSUnCorr:       0               0

HEC:            37473           82
OCD:            1132            0
LCD:            0               0
Total Cells:    323664848               17930146
Data Cells:     8565742         2502749
Drop Cells:     45
Bit Errors:     0               4488

ES:             1321            39
SES:            659             0
UAS:            18              18
AS:             7313

INP:            0.00            0.00
PER:            16.28           20.00
delay:          0.09            1.00
OR:             28.00           8.00

Bitswap:        1398            54

Total time = 2 hours 2 min 20 sec
FEC:            0               0
CRC:            590             73
ES:             321             39
SES:            59              0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Latest 15 minutes time = 2 min 20 sec
FEC:            0               0
CRC:            1               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Previous 15 minutes time = 15 min 0 sec
FEC:            0               0
CRC:            11              7
ES:             52              9
SES:            5               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Latest 1 day time = 2 hours 2 min 20 sec
FEC:            0               0
CRC:            590             73
ES:             321             39
SES:            59              0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Previous 1 day time = 0 sec
FEC:            0               0
CRC:            0               0
ES:             0               0
SES:            0               0
UAS:            0               0
LOS:            0               0
LOF:            0               0
Since Link time = 2 hours 1 min 53 sec
FEC:            0               0
CRC:            590             73
ES:             321             39
SES:            59              0
UAS:            0               0
LOS:            0               0
LOF:            0               0