Canadian TV, Computing and Home Theatre Forums banner

1 - 5 of 5 Posts

·
Registered
Joined
·
21 Posts
Discussion Starter #1
We have TELUS Internet on an ADSL profile while using a VDSL modem and are having troubles connecting at any speed higher than 44000 or 45,333, and are having upstream connections be as low as 16000.

We use the modem for Remote Access dial-in and need speed to run Timbuktu in color on large monitor modern computers. Not in mission-critical applications like putting out fires. We use this when DSL is down.

What is the best that can be expected from Telus with their switches on the code that runs on their switches?

Thanks in advance ....
 

·
Registered
Joined
·
8,290 Posts
The ADSL filters might be causing the problem.
 

·
Registered
Joined
·
7,131 Posts
If you are talking about downstream speeds of 44,000 or 45,333 and upstream connections as low as 16000 using a USRobotics Courier POTS modem, that's not uncommon. IIRC, the maximum is 56,000 and 28,000 but the lines would need to be pristine to accomplish that. Even with very good lines, about 50,000 down and 25,000 up are typical. Their may be a line quality problem. I've seen better speeds than you are getting, even with DSL on the same line, but that was with Bell.
 

·
Registered
Joined
·
125 Posts
In PSTN POTS, the max possible rate (inc overhead) is 56k down, and 33.6k up, for the lines that go to Telcos directly which have special digital termination. Otherwise, if my modem at home call your modem at home, let's say, then it'll be max at 33.6k both ways.

And then this is only the modem connection throughput, not your actual data throughput (need to take overhead off first). And then if you run TCP/IP then there is another layer of overhead.

And if you are talking "speed", that would actually mean the opposite of latency (and not throughput). POTS modems take a few hundred mS to encode / decode the data, so the average PING is a few hundred mS from modem to modem itself. On broadband (DSL / cable etc), the whole internet is a fraction of that. So if you have a lot of interactive things going on, bandwidth + latency both affect the overall performance.

It's pretty slow for today's standard, but the problem with PSTN modem is actually the stability of the connection, and the quality of the line (some modems can display SQ, but most can't), than actual "speed".

Not sure what else you can do about it, but you can consider trying a different modem brands and models (and sometimes firmware and settings (via AT commands)), it's quite complicated stuff.

Another thing is if the modem does a lot of retrain or dropping off, many many things can affect.
 
1 - 5 of 5 Posts
Top