Hi,
Have just had Vodafone 80/20 FTTC installed at work, engineer did the business with the Openreach modem and told me that we are syncing at higher speeds than was anticipating (basically the full 80/20). Our provider kindly forgot
mad to supply me with the 4-port WiFi router that we were supposed to use, so I've had to temporarily repurpose a 887VA I had earmarked for something else.
I have since plugged the VDSL line into it which I thought I had configured properly, and although it all syncs up correctly the download speed is woeful. It makes me think something obvious is wrong - like MTU, etc. I did try changing the MTU to 1492 and "ip tcp adjust-mss 1452" on the Vlan after a Google search but it made no difference.
Speedtest (on any server) is showing around ~10Mb/sec down, and ~20Mb/sec up. Curiously the upload seems to be fine?
The CRC & header errors, whilst small, seem like they might be related to the problem but to be honest I haven't previously configured xDSL from scratch on these.
This is the pertinent interface config:
Any thoughts? Thanks in advance!
Have just had Vodafone 80/20 FTTC installed at work, engineer did the business with the Openreach modem and told me that we are syncing at higher speeds than was anticipating (basically the full 80/20). Our provider kindly forgot
mad to supply me with the 4-port WiFi router that we were supposed to use, so I've had to temporarily repurpose a 887VA I had earmarked for something else.I have since plugged the VDSL line into it which I thought I had configured properly, and although it all syncs up correctly the download speed is woeful. It makes me think something obvious is wrong - like MTU, etc. I did try changing the MTU to 1492 and "ip tcp adjust-mss 1452" on the Vlan after a Google search but it made no difference.
Speedtest (on any server) is showing around ~10Mb/sec down, and ~20Mb/sec up. Curiously the upload seems to be fine?
Code:
Controller VDSL 0 is UP
Daemon Status: Up
XTU-R (DS) XTU-C (US)
Chip Vendor ID: 'BDCM' 'IFTN'
Chip Vendor Specific: 0x0000 0xB203
Chip Vendor Country: 0xB500 0xB500
Modem Vendor ID: 'CSCO' ' '
Modem Vendor Specific: 0x4602 0x0000
Modem Vendor Country: 0xB500 0x0000
Serial Number Near: FCZ173***** C887VA-W 15.3(3)M3
Serial Number Far: 5502331466
Modem Version Near: 15.3(3)M3
Modem Version Far: 0xb203
Modem Status: TC Sync (Showtime!)
DSL Config Mode: AUTO
Trained Mode: G.993.2 (VDSL2) Profile 17a
TC Mode: PTM
Selftest Result: 0x00
DELT configuration: disabled
DELT state: not running
Trellis: ON ON
SRA: disabled disabled
SRA count: 0 0
Bit swap: enabled enabled
Bit swap count: 0 0
Line Attenuation: 0.0 dB 0.0 dB
Signal Attenuation: 0.0 dB 0.0 dB
Noise Margin: 6.4 dB 12.2 dB
Attainable Rate: 81668 kbits/s 28733 kbits/s
Actual Power: 12.7 dBm 6.8 dBm
Per Band Status: D1 D2 D3 U0 U1 U2 U3
Line Attenuation(dB): 10.9 25.7 39.9 0.9 19.1 31.4 N/A
Signal Attenuation(dB): 10.9 25.7 39.9 0.9 18.9 31.3 N/A
Noise Margin(dB): 6.4 6.4 6.4 12.3 12.4 12.1 N/A
Total FECC: 0 0
Total ES: 147 0
Total SES: 0 0
Total LOSS: 0 0
Total UAS: 0 0
Total LPRS: 0 0
Total LOFS: 0 0
Total LOLS: 0 0
Full inits: 1
Failed full inits: 0
Short inits: 0
Failed short inits: 0
Firmware Source File Name (version)
-------- ------ -------------------
VDSL embedded VDSL_LINUX_DEV_01212008 (1)
Modem FW Version: 130205_1433-4.02L.03.A2pv6C035j.d23j
Modem PHY Version: A2pv6C035j.d23j
Vendor Version: Ap6v35j.23j 68
DS Channel1 DS Channel0 US Channel1 US Channel0
Speed (kbps): 0 79987 0 20000
SRA Previous Speed: 0 0 0 0
Previous Speed: 0 0 0 0
Reed-Solomon EC: 0 0 0 0
CRC Errors: 0 221 0 0
Header Errors: 0 37 0 0
Interleave (ms): 0.00 0.00 0.00 0.00
Actual INP: 0.00 0.00 0.00 0.00
Training Log : Stopped
Training Log Filename : flash:vdsllog.binThis is the pertinent interface config:
Code:
interface Vlan1
ip address 192.168.1.1 255.255.255.0
ip nat inside
ip virtual-reassembly in
!
interface Dialer0
ip address negotiated
ip nat outside
ip virtual-reassembly in
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication chap callin
ppp chap hostname xxxxx
ppp chap password 7 xxxxx
ppp ipcp dns request
ppp ipcp route default
!Any thoughts? Thanks in advance!
Last edited:
