Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

ATM DSL Diagnosis Help

Hello,

I have been tasked with trying to discover what is wrong with our current adsl connection. I have issued the show dsl interface atm command and made good progress in understanding the meaning of the output. (I would gladly share my findings by way of a spreadsheet.)

But I need an expert to cast their eye over the output to tell me if it is 'bad' or 'good'. Our router is a Cisco 2800 with four atm ports. We are in the UK.

It is my understanding that the line from the exchange to our building is quite long and the connection between the wall and the router is over 4 metres.

I also noticed a couple of LOM defects on atm0/0/0 and atm0/2/0.

Thank you in advance.

ATM0/0/0

Alcatel 20150 chipset information

                ATU-R (DS)                      ATU-C (US)

Modem Status:    Showtime (DMTDSL_SHOWTIME)

DSL Mode:        ITU G.992.1 (G.DMT) Annex A

ITU STD NUM:     0x01                            0x1

Vendor ID:       '    '                          'TSTC'

Vendor Specific: 0xDBB0                          0x0000

Vendor Country:  0x04                            0xB5

Capacity Used:   100%                            97%

Noise Margin:    -2.5 dB                          7.0 dB

Output Power:    20.0 dBm                        12.0 dBm

Attenuation:     47.0 dB                         25.0 dB

FEC ES Errors:    0                               0

ES Errors:       939989                          36

SES Errors:       0                               0

LOSES Errors:     0                               0

UES Errors:       0                               0

Defect Status:                       LOM     None

Last Fail Code:  None

Watchdog Counter: 0x40

Watchdog Resets: 0

Selftest Result: 0x00

Subfunction:     0x15

Interrupts:      2654 (1 spurious)

PHY Access Err:  0

Activations:     2

LED Status:      ON

LED On Time:     100

LED Off Time:    100

Init FW:         ASW_init_3_8_131.bin

Operation FW:    ASW_R3_8_131.bin

FW Source:       embedded

FW Version:      3.8.131

                 Interleave             Fast    Interleave              Fast

Speed (kbps):          6720                0           768                 0

Cells:            200940294                0    1084868157                 0

Reed-Solomon EC:      32801                0           529                 1

CRC Errors:            3612                0            81                 1

Header Errors:        54955                0            62                 1

Bit Errors:               0                0

BER Valid sec:            0                0

BER Invalid sec:          0                0

LOM Monitoring : Disabled

DMT Bits Per Bin

000: 0 0 0 0 0 0 0 8 7 9 B B C C C C

010: C B B B B B B A A 9 9 8 8 6 0 0

020: 0 0 0 0 0 0 6 6 6 7 8 8 9 9 9 A

030: A B B C C C C D D D D D D E E E

040: 0 E 2 E E E E E D E E D D D D D

050: D D D D D D D D D D D D D D D D

060: D C D D D D D D D D D D D D D B

070: C C C D D C C C C C C C C A C C

080: C C C C C B B B B B B 9 B B B B

090: B B B B A A A A A 9 A A 9 9 9 9

0A0: A A A 9 A A 9 8 9 9 9 9 9 9 9 9

0B0: 9 9 8 8 8 7 8 8 8 8 9 8 8 8 8 6

0C0: 6 6 5 5 5 5 5 5 5 5 5 5 5 5 5 5

0D0: 5 5 5 5 5 5 5 5 5 4 5 4 4 4 4 3

0E0: 3 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4

0F0: 4 4 3 3 2 0 0 0 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled

GLASAIRA#

show dsl interface atm 0/1/0

ATM0/1/0

Alcatel 20150 chipset information

                ATU-R (DS)                      ATU-C (US)

Modem Status:    Showtime (DMTDSL_SHOWTIME)

DSL Mode:        ITU G.992.1 (G.DMT) Annex A

ITU STD NUM:     0x01                            0x1

Vendor ID:       '    '                          'TSTC'

Vendor Specific: 0xDBB0                          0x0000

Vendor Country:  0x04                            0xB5

Capacity Used:   100%                            98%

Noise Margin:     5.0 dB                          7.0 dB

Output Power:    20.0 dBm                        12.0 dBm

Attenuation:     49.0 dB                         25.5 dB

FEC ES Errors:    0                               0

ES Errors:       940268                          36

SES Errors:       0                               0

LOSES Errors:     0                               0

UES Errors:       0                               0

Defect Status:   None                            None

Last Fail Code:  None

Watchdog Counter: 0xF6

Watchdog Resets: 0

Selftest Result: 0x00

Subfunction:     0x15

Interrupts:      2654 (0 spurious)

PHY Access Err:  0

Activations:     2

LED Status:      ON

LED On Time:     100

LED Off Time:    100

Init FW:         ASW_init_3_8_131.bin

Operation FW:    ASW_R3_8_131.bin

FW Source:       embedded

FW Version:      3.8.131

                 Interleave             Fast    Interleave              Fast

Speed (kbps):          6400                0           704                 0

Cells:            201004196                0     994723430                 0

Reed-Solomon EC:      43150                0           480                 1

CRC Errors:             145                0             9                 1

Header Errors:          133                0             4                 1

Bit Errors:               0                0

BER Valid sec:            0                0

BER Invalid sec:          0                0

LOM Monitoring : Disabled

DMT Bits Per Bin

000: 0 0 0 0 0 0 0 8 8 9 9 B B B B 9

010: 6 8 B B B B B A A 9 9 9 7 6 0 0

020: 0 0 0 0 0 0 5 6 7 7 8 8 9 9 9 A

030: A B B B C C C C C C C C C C C D

040: 0 D D 2 D D D D D D C C C C C C

050: C C C C C C C C C C C C C C C C

060: C C C C C C C C C C C C C C C B

070: C B C B B B B B B B B B B B B B

080: B B B B B B B B B B B A A B A A

090: A A A A A A A A A A A A A A A A

0A0: A 9 A 9 9 9 9 9 9 9 9 9 9 9 9 9

0B0: 9 9 9 9 9 9 9 9 8 8 8 8 4 8 8 6

0C0: 6 6 6 6 5 6 6 5 5 5 5 5 5 5 5 5

0D0: 5 5 4 2 4 4 4 4 4 4 4 4 4 4 4 4

0E0: 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4

0F0: 3 4 3 3 3 0 0 0 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled

GLASAIRA#show dsl interface atm 0/2/0

ATM0/2/0

Alcatel 20150 chipset information

                ATU-R (DS)                      ATU-C (US)

Modem Status:    Showtime (DMTDSL_SHOWTIME)

DSL Mode:        ITU G.992.1 (G.DMT) Annex A

ITU STD NUM:     0x01                            0x1

Vendor ID:       '    '                          'TSTC'

Vendor Specific: 0xDBB0                          0x0000

Vendor Country:  0x04                            0xB5

Capacity Used:   99%                             98%

Noise Margin:    -1.0 dB                          6.0 dB

Output Power:    20.0 dBm                        12.0 dBm

Attenuation:     48.0 dB                         25.0 dB

FEC ES Errors:    0                               0

ES Errors:       940292                          36

SES Errors:       0                               0

LOSES Errors:     0                               0

UES Errors:       0                               0

Defect Status:                       LOM     None

Last Fail Code:  None

Watchdog Counter: 0xFF

Watchdog Resets: 0

Selftest Result: 0x00

Subfunction:     0x15

Interrupts:      2654 (0 spurious)

PHY Access Err:  0

Activations:     2

LED Status:      ON

LED On Time:     100

LED Off Time:    100

Init FW:         ASW_init_3_8_131.bin

Operation FW:    ASW_R3_8_131.bin

FW Source:       embedded

FW Version:      3.8.131

                 Interleave             Fast    Interleave              Fast

Speed (kbps):          6752                0           800                 0

Cells:            200915940                0    1130423255                 0

Reed-Solomon EC:      34540                0           696                 2

CRC Errors:            7796                0             5                 3

Header Errors:         5985                0             4                 1

Bit Errors:               0                0

BER Valid sec:            0                0

BER Invalid sec:          0                0

LOM Monitoring : Disabled

DMT Bits Per Bin

000: 0 0 0 0 0 0 0 8 8 9 B B C C C C

010: C C C C B B B B A A 9 9 8 7 0 0

020: 0 0 0 0 0 0 4 4 5 5 6 7 7 7 8 8

030: 9 9 A A B B B C C C D D D D E E

040: 0 E E E E D D 2 E E E E E E E E

050: E E E E E E E E E E E E E C D B

060: D 6 E E E D E E E E E D D D D B

070: D D D D D D D D D D D D D 9 C C

080: D D D D C C C C C B C 8 B A A B

090: C B B B A A A B A 6 A A 9 A A A

0A0: A A A 9 9 A 8 6 9 A A A 9 9 9 9

0B0: 9 9 9 9 8 6 8 8 8 8 8 8 7 8 7 6

0C0: 6 6 4 4 2 2 2 4 5 5 5 5 5 5 6 6

0D0: 5 5 5 4 5 5 5 5 5 5 5 5 5 5 5 5

0E0: 5 5 5 4 5 4 5 5 4 4 4 4 4 4 4 4

0F0: 4 4 4 4 4 0 0 0 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled

GLASAIRA#show dsl interface atm 0/3/0

ATM0/3/0

Alcatel 20150 chipset information

                ATU-R (DS)                      ATU-C (US)

Modem Status:    Showtime (DMTDSL_SHOWTIME)

DSL Mode:        ITU G.992.1 (G.DMT) Annex A

ITU STD NUM:     0x01                            0x1

Vendor ID:       '    '                          'TSTC'

Vendor Specific: 0xDBB0                          0x0000

Vendor Country:  0x04                            0xB5

Capacity Used:   100%                            99%

Noise Margin:     3.0 dB                          6.0 dB

Output Power:    20.0 dBm                        12.0 dBm

Attenuation:     48.0 dB                         26.0 dB

FEC ES Errors:    0                               0

ES Errors:       940333                          36

SES Errors:       0                               0

LOSES Errors:     0                               0

UES Errors:       0                               0

Defect Status:   None                            None

Last Fail Code:  None

Watchdog Counter: 0x1D

Watchdog Resets: 0

Selftest Result: 0x00

Subfunction:     0x15

Interrupts:      2654 (0 spurious)

PHY Access Err:  0

Activations:     2

LED Status:      ON

LED On Time:     100

LED Off Time:    100

Init FW:         ASW_init_3_8_131.bin

Operation FW:    ASW_R3_8_131.bin

FW Source:       embedded

FW Version:      3.8.131

                 Interleave             Fast    Interleave              Fast

Speed (kbps):          6144                0           704                 0

Cells:            201014958                0     994786830                 0

Reed-Solomon EC:      42151                0          1388                 4

CRC Errors:             380                0            73                 3

Header Errors:          338                0            55                 0

Bit Errors:               0                0

BER Valid sec:            0                0

BER Invalid sec:          0                0

LOM Monitoring : Disabled

DMT Bits Per Bin

000: 0 0 0 0 0 0 0 8 7 9 A B B B B A

010: 8 6 8 A B B B B B A 9 9 7 6 0 0

020: 0 0 0 0 0 0 5 6 7 7 8 8 9 9 9 9

030: A A A B B B B B B B B B C C C C

040: 0 B B C B B B 2 C B C C B B B B

050: B B B B B B B B B B B B B B B B

060: B B B B B B B B B B B B B B B B

070: B B B B B B B B B B B B B A B B

080: B B B B B B B A A A A 9 A A A A

090: A A A A A A A A A 9 A A 9 A A 9

0A0: 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9

0B0: 9 9 9 9 9 8 9 9 8 8 8 7 4 7 8 6

0C0: 4 6 6 6 6 6 6 6 6 6 6 6 5 5 5 5

0D0: 5 5 4 2 4 5 5 5 5 5 5 5 5 4 4 4

0E0: 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4

0F0: 4 4 4 3 3 0 0 0 0 0 0 0 0 0 0 0

DSL: Training log buffer capability is not enabled

3 REPLIES
Hall of Fame Super Gold

Re: ATM DSL Diagnosis Help

Seems good. It showsyou're far away from CO with all the consequences.

New Member

Re: ATM DSL Diagnosis Help

Paolo,

Thank you. Am I correct in thinking that the attenuation values are a good indication of line length? Also is a negative noise margin value an indication that the ratio of signal strength to noise is bad for our connection?

I am having problems discovering the formula that is used to determine values and also what the optimal values should be. For example, looking at the attentuation, output power and noise margin values, is there a way of determining what is an 'acceptable/correct/expected' amount of crc/es/header errors?

Thanks once again in advance for your help,

David 

Hall of Fame Super Gold

Re: ATM DSL Diagnosis Help

Negative noise margine is certainly a bad thing, I didn't had noticed and had never saw one before.           

I don't have these formulas and I'm not sure if they even exists.

You can try updating ADSL firmware or the entire IOS (search), and get some improvement.

Alternatively see if you can get telco in switching you to a better pair, they can do good when they really want.

895
Views
0
Helpful
3
Replies
CreatePlease login to create content