Syncronization issues on ADSL environments

[mavespig]

Router# show dsl interface atm0

Alcatel 20150 chipset information

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

Modem Status:    Showtime (DMTDSL_SHOWTIME)

DSL Mode:        ITU G.992.1 (G.DMT)

ITU STD NUM:     0x01                            0x1 

Vendor ID:       'ALCB'                          'ALCB'

Vendor Specific: 0x0000                          0x0000

Vendor Country:  0x00                            0x0F

Capacity Used:   85%                             98%

Noise Margin:    13.5 dB                          7.0 dB

Output Power:     9.5 dBm                        12.0 dBm

Attenuation:      1.5 dB                          3.5 dB

Defect Status:   None                            None 

Last Fail Code:  None

Selftest Result: 0x00

Subfunction:     0x15

Interrupts:      5940 (0 spurious)

PHY Access Err:  0

Activations:     1

SW Version:      3.670

FW Version:      0x1A04

                 Interleave             Fast    Interleave              Fast

Speed (kbps):             0             8128             0               864

Reed-Solomon EC:          0                0             0                 0

CRC Errors:               0                0             0                 7

Header Errors:            0                0             0                 2

Bit Errors:               0                0

BER Valid sec:            0                0

BER Invalid sec:          0                0

Acceptable values for show dsl interface:
- NOISE MARGIN: The higher the better - [8-13] Average - [14-22] Good - [23-28] Excellent
Under 8dB the line will have flaps, loss of synchronization, possibly no synchronization at all.

- ATTENUATION: The lower the better - [20-30] Excellent - [30-40] Good - [40-60] Average
Over 60, the attenuation is too high and you will have issues