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[tgurgis]

i am away from DSLAM 4.5km and i was wondering if i should downgrade my speed
my list status for more infos:
adslctl: ADSL driver and PHY status
Status: ShowtimeRetrain Reason:   1
Channel: FAST, Upstream rate = 509 Kbps, Downstream rate = 2559 Kbps
Link Power State: L0
Mode:         ADSL2+
Channel:      Fast
Trellis:      U:ON /D:ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):   10.6      20.3
Attn(dB):   59.5      34.8
Pwr(dBm):   14.9      12.4
Max(Kbps):   4232      973
Rate (Kbps):   2559      509
         G.dmt framing
K:      80(0)      16
R:      0      0
S:      1      1
D:      1      1
         ADSL2 framing
MSGc:      59      16
B:      79      15
M:      1      1
T:      1      3
R:      0      0
S:      0.9876      0.9846
L:      648      130
D:      1      1
         Counters
SF:      721500      723702
SFErr:      278      6
RS:      0      0
RSCorr:      0      0
RSUnCorr:   0      0

HEC:      141      36
OCD:      2      0
LCD:      0      0
Total Cells:   69900823      344302015
Data Cells:   1718873      3539754
Drop Cells:   0
Bit Errors:   0      487

ES:      4568      4
SES:      48      0
UAS:      94      39996
AS:      11580

INP:      0.00      0.00
PER:      16.04      16.24
delay:      0.24      0.24
OR:      32.40      10.83

Bitswap:   43      0

Total time = 22 hours 32 min 13 sec
SF  = 4966241
CRC = 8838
LOS = 2
LOF = 18
ES  = 4568
Latest 1 day time = 22 hours 32 min 13 sec
SF  = 4966241
CRC = 8838
LOS = 2
LOF = 18
ES  = 4568
Latest 15 minutes time = 2 min 13 sec
SF  = 8375
CRC = 0
LOS = 0
LOF = 0
ES  = 0
Previous 15 minutes time = 15 min 0 sec
SF  = 56057
CRC = 65
LOS = 0
LOF = 0
ES  = 26
Previous 1 day time = 0 sec
SF  = 0
CRC = 0
LOS = 0
LOF = 0
ES  = 0
15 minutes interval [-30 min to -15 min] time = 15 min 0 sec
SF  = 56058
CRC = 34
LOS = 0
LOF = 0
ES  = 24
15 minutes interval [-45 min to -30 min] time = 15 min 0 sec
SF  = 56058
CRC = 15
LOS = 0
LOF = 0
ES  = 9
15 minutes interval [-60 min to -45 min] time = 15 min 0 sec
SF  = 56120
CRC = 8
LOS = 0
LOF = 0
ES  = 8
Showtime Drop Reason:   1
Last Retrain Reason:   1


Thnanks

[waltergmw]

Hi tgurgis and welcome,

You'll see that at:-

http://www.kitz.co.uk/adsl/max_speed_calc.php

your performance is well above that estimated by Kitz.
I would leave well alone.

Kind regards,
Walter

[tgurgis]

thanks for your reply but one last thing i want to know what is optimal MTU value i should use according to the speed u see in my status 2434/509 PPPoA Vux .
note: i measured the maximum ping in cmd and it was 1472

Thanks in advance

[tgurgis]

After i changed my Belkin n1 vision modem/router from Multimode to G.DMT my line status changed below
my question i am 4.1 to 4.5 Km away from my exchange should i keep it at G.DMT ?

adslctl: ADSL driver and PHY status
Status: ShowtimeRetrain Reason:   0
Channel: FAST, Upstream rate = 512 Kbps, Downstream rate = 2560 Kbps
Link Power State: L0
Mode:         G.DMT
Channel:      Fast
Trellis:      ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):   13.1      19.0
Attn(dB):   57.0      31.5
Pwr(dBm):   17.8      12.2
Max(Kbps):   3648      1096
Rate (Kbps):   2560      512
         G.dmt framing
K:      81(0)      17
R:      0      0
S:      1      1
D:      1      1
         ADSL2 framing
MSGc:      1      1
B:      81      17
M:      1      1
T:      1      1
R:      0      0
S:      1.0000      1.0000
L:      656      144
D:      1      1
         Counters
SF:      5958      5888
SFErr:      26      0
RS:      0      0
RSCorr:      0      0
RSUnCorr:   0      0

HEC:      11      0
OCD:      0      0
LCD:      0      0
Total Cells:   605673      0
Data Cells:   5116      0
Drop Cells:   0
Bit Errors:   0      0

ES:      16      0
SES:      0      0
UAS:      11      0
AS:      101

INP:      0.00      0.00
PER:      1.75      1.75
delay:      0.25      0.25
OR:      32.00      32.00

Bitswap:   0      0

Total time = 1 min 56 sec
SF  = 5958
CRC = 26
LOS = 0
LOF = 0
ES  = 16
Latest 1 day time = 1 min 56 sec
SF  = 5958
CRC = 26
LOS = 0
LOF = 0
ES  = 16
Latest 15 minutes time = 1 min 56 sec
SF  = 5958
CRC = 26
LOS = 0
LOF = 0
ES  = 16
Previous 15 minutes time = 0 sec
SF  = 0
CRC = 0
LOS = 0
LOF = 0
ES  = 0
Previous 1 day time = 0 sec
SF  = 0
CRC = 0
LOS = 0
LOF = 0
ES  = 0
Showtime Drop Reason:   0
Last Retrain Reason:   0

[jeffbb]

Hi
very quick calculation shows that original stats gave 1 CRC ~every 11 secs. these latest ones show 1 CRC ~every 5 secs. neither of these are very good .
That basically means that when downloading you will have many retransmissions which will slow your throughput

Your last stats were for a very short time so may not be as bad as shown.

The  Max speed link calculates all speeds based on GDMT attenuation,  so your line could expect a synch speed of about 3400Kbps on ADSL2+with the normal default  target SNR margin of 6db. You are below this probably because of your enhanced Target SNR  margin of 12db .

There is nothing to be gained by changing to GDMT . The  difference in Attenuation is caused by the added high frequency tones .

quote note: i measured the maximum ping in cmd and it was 1472

Working out your maximum MTU

see http://www.kitz.co.uk/adsl/MTU2.htm

I would also run routerstats  to plot Your SNR margin over time to see what noise there is on the line , and maybe work out why there are so many CRCs

Regards Jeff