[c-nsp] show dsl int atm 0

Mon Feb 2 03:39:05 EST 2009

In my opinion and based on my short experience with ADSL on Cisco routers, the only values that are relevant for me are:

Noise Margin: which represents, as the name says it, how far is your signal from the noise, the higher the better, the lowest recommended value would be around 20%.

Attenuation: the lower the better, anything below 10-15 dB, the highest this value is it means there may be problems in the hard line, or perhaps you're too far from the DSLAM.

These values are of course correlated to the others (Capacity, Output power) everything is a function of line quality, physically talking. The errors may be related to a poor quality.
Some workarounds can be setting the DSL mode to some specific mode instead of automatic, but you should know what is the best, you may talk with your provider and ask about this, when too far from the DSLAM or the line quality is poor, lowering the speed of the link may help improve those values too.
As I said, this is only "field" knowledge, is not based on any "scientific" facts, just mere experience.
Feel free to correct me if I'm wrong about something, I'd be glad to learn some more about this
Hope this helps
Ziv

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Basha
Sent: Monday, February 02, 2009 7:54 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] show dsl int atm 0

Hi Guys,

I need some assistance trying to understand the out put of show dsl int atm
0 command. Specifically the 'bit errors' column.

ATM0/0/0
Alcatel 20190 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:       'STMI'                          'GSPN'
Vendor Specific: 0x0000                          0x0008
Vendor Country:  0x0F                            0xFF
Capacity Used:   15%                             67%
Noise Margin:    21.0 dB                          8.0 dB
Output Power:    13.5 dBm                         2.0 dBm
Attenuation:     23.0 dB                         11.5 dB
Defect Status:   None                            None

Last Fail Code:  None
Watchdog Counter: 0x2A
Watchdog Resets: 0
Selftest Result: 0x00
Subfunction:     0x00
Interrupts:      3834 (0 spurious)
PHY Access Err:  0
Activations:     1
LED Status:      OFF
LED On Time:     0
LED Off Time:    0
Init FW:         embedded
Operation FW:    embedded
FW Version:      2.542
                 Interleave             Fast    Interleave              Fast
Speed (kbps):             0             1536             0               512
Cells:                    0          3404282             0         659208107
Reed-Solomon EC:          0                0             0                 0
CRC Errors:               0                0             0                 1
Header Errors:            0                0             0                 0
Bit Errors:               0            48896
BER Valid sec:            0          7725096
BER Invalid sec:          0                0
LOM Monitoring : Disabled

Customer is running video and is seeing lots of packet drops

Thanks
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