Slower ADSL on OpenWrt Netgear DM200

Installing and Using OpenWrt
1

I've been running a stock Vodafone modem/router for a while, but want to do some advanced networking so have a openWRT flashed Netgear RM200 placed in a DMZ.

My stock vodafone modem/router gets just under 40mbps down.
the RM200 gets about 25mbps.

I've configured as per the docs, and it works, just slower.

What could the reason be?

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2

That's probably ADSL vs VDSL.

3

Do you mean the DM200?

4

Yes! Edited..

5

It does seem a coincidence the speed I'm getting with the DM200 it right at the limit of ADSL.
The Netgear specs say it supports vdsl, now I need to figure out how to configure that in openwrt

6 
root@OpenWrt:~# /etc/init.d/dsl_control status

ATU-C Vendor ID:                          Broadcom 164.161
ATU-C System Vendor ID:                   Broadcom
Chipset:                                  Lantiq-VRX200
Firmware Version:                         5.7.9.9.0.6
API Version:                              4.17.18.6
XTSE Capabilities:                        0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2
Annex:                                    B
Line Mode:                                G.993.2 (VDSL2)
Profile:                                  17a
Line State:                               UP [0x801: showtime_tc_sync]
Forward Error Correction Seconds (FECS):  Near: 0 / Far: 1044
Errored seconds (ES):                     Near: 0 / Far: 4
Severely Errored Seconds (SES):           Near: 0 / Far: 0
Loss of Signal Seconds (LOSS):            Near: 0 / Far: 0
Unavailable Seconds (UAS):                Near: 84 / Far: 84
Header Error Code Errors (HEC):           Near: 0 / Far: 0
Non Pre-emtive CRC errors (CRC_P):        Near: 0 / Far: 0
Pre-emtive CRC errors (CRCP_P):           Near: 0 / Far: 0
Power Management Mode:                    L0 - Synchronized
Latency [Interleave Delay]:               0.14 ms [Fast]   0.0 ms [Fast]
Data Rate:                                Down: 24.928 Mb/s / Up: 9.988 Mb/s
Line Attenuation (LATN):                  Down: 9.4 dB / Up: 28.2 dB
Signal Attenuation (SATN):                Down: 5.2 dB / Up: 28.1 dB
Noise Margin (SNR):                       Down: 3.4 dB / Up: 5.9 dB
Aggregate Transmit Power (ACTATP):        Down: 7.4 dB / Up: 10.1 dB
Max. Attainable Data Rate (ATTNDR):       Down: 26.853 Mb/s / Up: 10.157 Mb/s
Line Uptime Seconds:                      329
Line Uptime:                              5m 29s

Actually it looks like VDSL is enabled...

7

You could also ask the ISP if vectoring is required on their line. For licensing reasons, OpenWRT does not ship VDSL firmware with vectoring support. I can't say for DM200, but on BT HomeHub 5 there is a script, vdsl_fw_install.sh, that tries to install some non-redistributable firmware that supports vectoring. Alternatively, look at https://xdarklight.github.io/lantiq-xdsl-firmware-info/ for possible downloads.

8

Thanks, I quick search suggests its very unlikely vectoring is enabled, but I will double check

9

I've changed to annex A, and now getting 32mbps with the DM200

10

up to full speed now.
it seems the config in https://openwrt.org/docs/guide-user/network/wan/isp-configurations is out of date.

Vodafone UK is Annex A not B

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