|Forums | USR | 3Com is the worst? Surely not...||Watch|
|Posted - 8/21/2000 1:04:13 PM |
I have tested every possible combination of modems - system, time of day, ISP and phone line. In identical configurations differing only in the modem, I get about 10-15% worse performance with my 3Com modem than anything else, and that deficit is certainly noticable on big downloads.
For one setup, with my 3Com modem I get 45333bps connect and 4.5kb/s download; others connect between 49333 and 54666 (sustained connection seems to be 49333-52000), all with downloads of >5kb/s
Has anyone else found this to be the case? I am at a loss to explain it. Everywhere I see 3Com modems beating everything else, yet mine is not even equalling anything else.
|Posted - 8/21/2000 1:48:12 PM |
Update... just disabled V.90 on my modem (hence x2 connect), had connects at 49333 and 52000, very slight improvement in performance on the 49333 connection (the 52k was in hyperterm. Oops) - 4.6kb/s
I read elsewhere in the forum that USR reckon you would get better throughput at a higher speed if you have <4000 Blers/hour.
My last connection was V.90 at 45333 (modem doesn't seem to budge from that speed) for 2h54m, and I had 52 blers (admittedly, quite low utilisation during that time - 4.6Mb down, 500kb up).
If you multiply the 52 blers by 20 - I could have downloaded ten times the amount if it was all compressed, so 20 seems reasonable - that's about 350 blers/hour, still well under that 4000 figure.
Anyone else see something that doesn't gel? Why doesn't the modem connect higher/upshift?
|Posted - 8/22/2000 7:29:33 PM |
The brand/firmware in the server modems you call will have an effect: what kind of modems ar you calling? Have you tried other brands at the ISP end?
|Posted - 8/23/2000 7:23:38 AM |
I get (nearly) the same with *every* ISP - one ISP seems to cause every connect to be 1333 lower, regardless of modem and phone line (another bizarre thing I don't understand).
With a poorer quality phone line, the difference almost disappears, my USR connects at 38666/40k, others at 42666/44k (which then renegotiate lower), but throughput is about the same (4.1kb/s). Again, this goes against everything I read that says that they tend to do better on an impaired line.
My usual ISP uses 3Com Total Control (HiPerArc), I don't know what the others I have tried use, but it seems to make no difference. Except that an ESS chipset modem can't connect better than V.34+ to my usual ISP, but has no difficulty with anyone else (yet another oddity).
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