I have an old Tenda D820R ADSL2+ Router that I manage to sync stable at 8315 Kbps (Down) and 1023 Kbps (Up). The modem us currently used in bridge mode as I have my firewall located on a Mikrotik device. I am looking at upgrading the ADSL Modem/Router to a newer model that will also support bridge mode and possibly better sync speeds. It will only be used in bridge mode as my Mikrotik device is doing the dial-up etc. What make and model would be the suggested route to take?
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Johnatan56
Honorary Master
Your sync speed won't improve. That has to do with the line itself and it's modulation.
Could you post your line stats?
The line used to be rock solid at 9.5 down, guessing there is more interference on the line lately =\
From the Afrihost Website:
Downstream:
SNR: 9.1dB
Attenuation: 26.4dB
Upstream:
SNR: 6.3dB
Attenuation: 47.0dB
Johnatan56
Honorary Master
Check it on your router and not the Afrihost site.
MickZA
Executive Member
D-Link DSL-2500U is a good modem for bridge use but as Johnatan56 says there's no magic bullet modem for improving your sync speed. If your downstream attenuation is greater than 40dB chances are that 8mbps is the best you'll get on old copper.
Edit: just saw your stats - they look weird, check on modem rather as Johnaton56 says.
... stats make sense if upstream & downstream are reversed which makes sense when viewed from the ISP.
Edit: just saw your stats - they look weird, check on modem rather as Johnaton56 says.
... stats make sense if upstream & downstream are reversed which makes sense when viewed from the ISP.
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Unfortunately this modem does not seem to give that info =(
Thanks for the advice, will look into that modem, my downstream is sitting at 26.4dB, upstream is at 47dB. Not sure how accurate the Afrihost info is though.
Edit: I double checked the stats on the Afrihost site (Unless their dev got it swapped around) the downstream ("ADSL Router Results (Telkom Exchange to Your Location)") is sitting at 26.4dB. Guess it is time to get a proper modem that I can see these stats.
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Seems like the DSL-2500U is being phased out in favor of the DSL-2520U-Z1, would you still suggest the DSL-2500U?
MickZA
Executive Member
On the road atm, I'll check when when I'm back in the office.
I eventually settled on the DSL-2740U, my line stats are much better now
Up Stream 1023 kbps
Down Stream 10238 kbps
Attenuation Down Stream 43
Attenuation Up Stream 28
SNR Margin Down Stream 6.1
SNR Margin Up Stream 10.9
Guess my old modem was on its way out. Thanks for the advice.
I eventually settled on the DSL-2740U, my line stats are much better now
Up Stream 1023 kbps
Down Stream 10238 kbps
Attenuation Down Stream 43
Attenuation Up Stream 28
SNR Margin Down Stream 6.1
SNR Margin Up Stream 10.9
Guess my old modem was on its way out. Thanks for the advice.
I am seeing a high number of CRC errors when looking at the ADSL Driver page on the device. Guessing this is something not 100% with my line?
Johnatan56
Honorary Master
Yes, was going to say that, was out for most of the day, sorry.
But before you log a fault, could you unplug all phones/filters and plug the router into the wall directly to see if there is any change?
And do you perchance know the approximate distance to the exchange?
Also, the Afrihost stats are opposite to yours, their upstream is your downstream and vice versa.
At 43db Attentutation you should have a 10Mbps stable connection.
In comparison, my stats:
Code:
Uptime 03Days 09hrs 20min 32sec
Time connected 03Days 06hrs 50min 45sec
Modulation type G.992.5-A
Actual rate (up) 1020 kbps
Actual rate (down) 10236 kbps
Data transfered (sent) 0 kB
Data transfered (received) 0 kB
Output power (up) 12 dBm
Output power (downstream) 17.2 dBm
Line attenuation (up) 22.4 dBm
Line attenuation (downstream) 42.2 dB
Noise margin (up) 7.8 dB
Noise margin (downstream) 9.2 dB
Manufacturer ID (local) IFTN
Manufacturer ID (remote) BDCM
Loss of frames (local) 0
Loss of frames (remote) 0
Error seconds (local) 0
Error seconds (remote) 0
FEC Errors (up) 0
FEC Errors (down) 0
CRC Errors (up) 0
CRC Errors (down) 0
HEC Errors (up) 0
HEC Errors (down) 0If you don't see an improvement, log a fault.
Thanks for getting back to me on this. Unfortunately I do not know how far I am from the exchange =\. I have unplugged everything else and am still getting the errors so going to have the re-create my port (Don't think this will solve the problem though) and then log a call if it is still happening. What model D-Link are you using? It seems to give a more comprehensive set of info.
Johnatan56
Honorary Master
It's the Telkom pace router, but I used to also have a D-link 2640U till last year (swapped it due to needing faster WiFi, maid knocked it off the table a couple of times), which has all of the stats as well.
Would not recommend getting this router though, can't change DNS settings.
MickZA
Executive Member
... still waiting for my HW guys to get info on the EOL status of the DSL-2500U and availability/pricing of the DSL-2520U.I eventually settled on the DSL-2740U, my line stats are much better now
...
Guess my old modem was on its way out.
The DSL-2740U is a bit of an overkill if you're using it in bridge mode or have you retired the Microtik?
Nice to see you're synching at 10mbps now - does the DSL-2740U report the attainable rate?
Yeah, it is a bit overkill but managed to get it at a semi-decent price from Frontosa. Mikrotik is still being used for my multi-routing
. These are my stats:
When Telkom enabled Interleave (Default is Fast Path) channel mode on my line it dropped my CRC errors considerably however upped my latency by about 30ms, so I ended up leaving it on Fast Path for now. I am liaising with the Telkom rep to see if there is anything else they can do.
I've read that if you're far from an exchange or if you line is low quality, modems with Broadcom chips are better. Modems with Trendnet chips are able to attain higher sync rates when conditions are ideal.
The modems I've read good things about:
Broadcom: D-Link DSL-520B
Trendnet: TP-Link TD-8816
I haven't been able to find the 520B in South Africa.
The modems I've read good things about:
Broadcom: D-Link DSL-520B
Trendnet: TP-Link TD-8816
I haven't been able to find the 520B in South Africa.