857 Slow ADSL2+ Speed

[Thomas Cotton]

Hi,

My speed has dropped from 1.3 MBps tp 750 KBps over the past few days. Anyone got any ideas what could cause this? I've tried a few reboots over the past few days but still the same. I plug in my old o2 router and it syncs at 1.3MBps, but then the 857 will sync at 700KBps. I have has the 857 running at 1.3MBps, but have also been changing a lot of config, and can't remember what I've changed

Config below:

Cotton_R1#show dsl interface atM0
ATM0
Alcatel 20190 chipset information
ATU-R (DS) ATU-C (US)
Modem Status: Showtime (DMTDSL_SHOWTIME)
DSL Mode: ITU G.992.5 (ADSL2+) Annex A
ITU STD NUM: 0x03 0x2
Chip Vendor ID: 'STMI' 'BDCM'
Chip Vendor Specific: 0x0000 0x918F
Chip Vendor Country: 0x0F 0xB5
Modem Vendor ID: 'CSCO' ' '
Modem Vendor Specific: 0x0000 0x0000
Modem Vendor Country: 0xB5 0x00
Serial Number Near: FCZ122011FR
Serial Number Far:
Modem Version Near: 12.4(6)T11
Modem Version Far:
Capacity Used: 67% 100%
Noise Margin: 10.5 dB 6.0 dB
Output Power: 19.0 dBm 12.0 dBm
Attenuation: 41.0 dB 17.0 dB
Defect Status: None None
Last Fail Code: None
Watchdog Counter: 0x5E
Watchdog Resets: 0
Selftest Result: 0x00
Subfunction: 0x00
Interrupts: 17453 (0 spurious)
PHY Access Err: 0
Activations: 2
LED Status: ON
LED On Time: 100
LED Off Time: 100
Init FW: embedded
Operation FW: embedded
FW Version: 2.5.42

DS Channel1 DS Channel0 US Channel1 US Channel0
Speed (kbps): 0 7157 0 1052
Cells: 0 869270494 0 707166898
Reed-Solomon EC: 0 46211 0 0
CRC Errors: 0 615 0 0
Header Errors: 0 585 0 0
Total BER: 0E-0 65535E-255
Leakage Avarage BER: 0E-0 65535E-255
Interleave Delay: 0 8 0 0

LOM Monitoring : Disabled

Building configuration...

Current configuration : 5127 bytes
!
! Last configuration change at 20:16:47 GMT Sun Nov 28 2010 by tcotton
! NVRAM config last updated at 19:59:46 GMT Sun Nov 28 2010 by tcotton
!
version 12.4
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname Cotton_R1
!
boot-start-marker
boot-end-marker
!
logging buffered 4096 debugging
enable secret 5 ***
!
aaa new-model
!
!
aaa authentication login default local
aaa authentication ppp default local
aaa authorization network default local
!
aaa session-id common
!
resource policy
!
clock timezone GMT 0
clock summer-time PCTime date Mar 30 2003 1:00 Oct 26 2003 2:00
no ip source-route
ip dhcp relay information trust-all
no ip dhcp use vrf connected
ip dhcp excluded-address 172.30.0.1 172.30.0.2
ip dhcp excluded-address 172.30.1.1 172.30.1.5
!
ip dhcp pool LAN
import all
network 172.30.0.0 255.255.0.0
default-router 172.30.0.1
dns-server 172.30.0.1
lease 7
!
!
ip cef
no ip bootp server
ip domain name cotton.com
ip name-server 87.194.255.154
ip reflexive-list timeout 60
vpdn enable
!
vpdn-group COTTON_VPN
! Default PPTP VPDN group
accept-dialin
protocol pptp
virtual-template 1
!
!
!
crypto pki trustpoint TP-self-signed-***
enrollment selfsigned
subject-name cn=IOS-Self-Signed-Certificate-***
revocation-check none
rsakeypair TP-self-signed-**
!
!
crypto pki certificate chain TP-self-signed-***
certificate self-signed 01
****
quit
username *** privilege 15 secret 5 ***
username *** password 7 ***
archive
log config
hidekeys
!
!
!
bridge irb
!
!
interface ATM0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
ip virtual-reassembly
no atm ilmi-keepalive
dsl operating-mode adsl2+
dsl enable-training-log
!
interface ATM0.1 point-to-point
description O2 Broadband ADSL2+ interface
bandwidth 1600
ip address dhcp
ip access-group FIREWALL_IN in
ip access-group FIREWALL_OUT out
ip nat outside
ip virtual-reassembly
logging event subif-link-status
no snmp trap link-status
atm route-bridged ip
pvc 0/101
oam-pvc manage
encapsulation aal5snap
!
!
interface FastEthernet0
!
interface FastEthernet1
!
interface FastEthernet2
!
interface FastEthernet3
!
interface Virtual-Template1
ip unnumbered BVI1
ip nat inside
ip virtual-reassembly
peer default ip address dhcp-pool LAN
no keepalive
ppp encrypt mppe 128
ppp authentication ms-chap-v2
!
interface Vlan1
no ip address
bridge-group 1
bridge-group 1 spanning-disabled
!
interface BVI1
ip address 172.30.0.1 255.255.0.0
ip nat inside
ip virtual-reassembly
!
no ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 ATM0
!
no ip http server
no ip http secure-server
ip nat pool NAT_POOL 172.30.0.1 172.30.0.254 netmask 255.255.0.0
ip nat inside source list 1 interface ATM0.1 overload
ip dns server
!
ip access-list extended FIREWALL_IN
evaluate iptraffic
ip access-list extended FIREWALL_OUT
permit ip any any reflect iptraffic
!
access-list 1 permit 172.30.0.0 0.0.255.255
no cdp run
!
control-plane
!
bridge 1 protocol ieee
bridge 1 route ip
banner motd ^C
*********************************************************
Unauthorized Access Prohibited
Authorized Access Only
Disconnect IMMEDIATELY if you are not an authorized user!
*********************************************************
^C
!
line con 0
privilege level 15
logging synchronous
no modem enable
line aux 0
line vty 0 4
session-timeout 60
access-class 1 in
privilege level 15
logging synchronous
transport input ssh
!
scheduler max-task-time 5000
ntp server 131.107.1.10
end

[paolo bevilacqua · Accepted solution]

You could try newer ADSL firmware. Search the forum about it.

However, you have high attenuation D/S. That may be caused by bad weather wetting splices.

[Thomas Cotton]

Great advice thanks. I'm now running at 1.3MBps

Applies to:
Routers - Cisco 857, Cisco 876, Cisco 877, Cisco 1801, Cisco 1802

Modules - HWIC-1ADSL1, HWIC-1ADSLI, HWIC-ADSL-B/ST, HWIC-ADSLI-B/ST

To check the firmware version run the following command.

show dsl interface atm0 (atm0 will be different when using modules)

If the firmware version is lower than 3.0.10

Go to [ftp.cisco.com]

and download the most current ADSL firmware

save the file to your computer rename it to adsl_alc_20190.bin

Upload it to the router either via SDM or any TFTP software and reload your router

check that the update was successful by running show dsl interface atm0