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Alex Fray

Cisco 877w - ADSL packet loss

Hi, i'm having some issues with a Cisco 877W router connected to an ADSL line (UK). I have layer 3 connectivity to/from the router to our data centers across the private broadband cloud but i'm getting alot (approx 10%) packet loss which is causing the user issues working in our citrix environment.

There are no errors on the vlan, atm or dialer interface and from the sh dsl interface command below, the attentuation is low and the only errors i can see to possibly explain this are the CRC, ES and header errors (shown below). The ISP have said the line is fine so are reluctant to try anything, could this be that the download/upload speed is to high and needs to be lowered for a more stable connection? is there anything configurable on the router i can try to get rid of this packet loss?

cisco877w#sh dsl int


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:    0x03                            0x1

Vendor ID:      'STMI'                          'ALCB'

Vendor Specific: 0x0000                          0x0000

Vendor Country:  0x0F                            0x0F

Chip ID:        C196P (1) DFE BOM:        DFE3.0 Annex A (1)

Capacity Used:  95%                            48%

Noise Margin:    7.0 dB                        23.0 dB

Output Power:    10.0 dBm                        12.0 dBm

Attenuation:      8.0 dB                          4.0 dB

FEC ES Errors:    0                              0

ES Errors:      1195                            78

SES Errors:      0                              0

LOSES Errors:    0                              0

UES Errors:      0                              0

Defect Status:  None                            None

Last Fail Code:  None

Watchdog Counter: 0x25

Watchdog Resets: 0

Selftest Result: 0x00

Subfunction:    0x00

Interrupts:      8384 (0 spurious)

PHY Access Err:  0

Activations:    22

LED Status:      ON

LED On Time:    100

LED Off Time:    100

Init FW:        init_AMR-3.0.014_no_bist.bin

Operation FW:    AMR-3.0.014.bin

FW Source:      embedded FW Version:      3.0.14                

Interleave            Fast    Interleave              Fast

Speed (kbps):          7616                0          448                0

Cells:                30491                0      1731096                0

Reed-Solomon EC:      31894                0            1                1

CRC Errors:            124                0            7                1

Header Errors:          114                0            0                1

Total BER:                65535E-255            0E-0

Leakage Average BER:      65535E-255            0E-0                        

ATU-R (DS)      ATU-C (US)

Bitswap:              enabled            enabled

Bitswap success:          0                  0

Bitswap failure:          0                  0

paolo bevilacqua
Hall of Fame Master

Attentuation is low but so is noise margin unfortunately.

To be on the safe side, you should update IOS and ADSL firmware.