WRT54G3G-ST Upload Issue

glacierjima · Posted: Thu Apr 05, 2007 1:12 pm Post subject:

Ok, have another update. I actually got to talk to someone who seems to be trying to help. This time it is going to be sent to the back line for testing and I do have a case number at least and was told that once the tests were over, they would send me an email with their results, using the same tests that I used, specifically using dslreports.com and testmy.net have been the 2 I've used the most. It could be a week or 2 before I get anymore update, but I'm hoping it's a start at least.

Jim

josw · EVDO User Joined: 06 Feb 2007 Posts: 66

Somebody real nice at Sprint told me the same thing and the the tech person called me (voice mail) and said as long as I was getting the good speeds thru my laptop that was all they supported, that I would have to call linksys for support thru the router, so she was closing the ticket. If I could have talked to her I would have said it was Sprint who had to write the firmware for the router to get the Pantech PX 500 to work in it in the first place. When I called Linksys about it they told my that was normal. I am suprized somebody at 3g hasnt chimed in about this issue.

glacierjima · Posted: Fri Apr 06, 2007 6:32 pm Post subject:

Well,
I'm not sure where this will take us, but it might be a start. The other thing I'm going to bring up when I hear back is, I want some documentation on what the "normal" expectation can be for speeds on a router. If you plug a cable modem into the port..are you only going to get 250k uploads? I would love to see some documentation on this, but not going to hold my breath.

Michael · Posted: Sun Apr 08, 2007 7:38 am Post subject:

josw · EVDO User Joined: 06 Feb 2007 Posts: 66

The answer you just gave Michael is YOU dont have a answer if you did you would say something, like you do on just about every other comment made on this forum

Michael · Posted: Sun Apr 08, 2007 11:40 am Post subject:

Actually, been too busy to reply to every post up here,
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DonL

I had a lenghty discussion with Linksys about the upload speed problem. They said that they do not have this listed as a reported problem and gave me a series of things to try such as changing the MTU settings to 1492, 1400, and 1300 cycling power between each. I do not think this will help as I get same 1/2 speed upload with either wireless or wired. I also have ordered a DLink DIR450 and possibly will order an TGMB8000 to test with my Merlin S720 card.

I will let you know what I see. But if others are seeing this problem maybe they should speak up to Linksys.

Fox McCloud · EVDO Junkie Joined: 02 Dec 2006 Posts: 595

Fl00d_Pr0z · EVDO Junkie Joined: 08 Dec 2006 Posts: 218

I've reported this issue several times to both Linksys AND Sprint. Shocked

jackrodgers · EVDO Addict Joined: 23 Mar 2006 Posts: 1127

Unsure of the relevence other than the word 'modem'.

I recall in the dark ages a conflict involving compression of the data. You could see a difference in transfer speeds depending upon the combination of hardware compression on/off and compressed and uncompressed files. Some applications offered software compression which then might have to face hardware compression in the modem.

I see several possible compression/decompression sources:

Your telco
Your wireless modem
Your Router
Your wifi on the router
Your wifi in your computer
Your software

Using just the card there are just 3 possibilities.
Using the router there are 3 additonal possibilities, twice as many.

Is your wifi set to encrypt the data, not just the passwords?

Another delay may arise due to the fact that you are using a router which must spend some cycles checking for other customers and other housekeeping tasks assigned to it by the engineers. It will spend time on these tasks, pausing other tasks since it is most likely not multi-threaded or multi-tasking so that it could do multiple tasks at the same time.

I can't begin to guess what delays this will cause but it seems likely that these pauses will decrease your average download and upload speeds, even though these will occur, in their allotted time, at the maximum possible transmission speeds determined by your telco.

I would assume that the actual burst speed of the transmission is quite high but the low averages are created by the gaps in time between the transmission bursts. Thus the problem is to find out what is causing these long gaps and how to shorten them.

Compression and malware checkers are good places to look for these delays.

Another assumption based on a photo posted months ago before the unit shipped: the unit might be a hack with pieces not designed to work together forced to work together by firmware. A small mother board created to act as an in between for the card, router and wifi systems. It may not have enough memory to buffer large amounts of data.

I suspect both and that in a few years when the market is big enough somone will design the motherboard for the unit that nicely integrates the functions with a small fraction of the delay of today's units.

We've had wifi PC Cards for a decade or so that would act as a broadcast station inside a Mac and I would also assume a PC. Instead of lumping together three unique systems as is now done, perhaps one card will handle both wifi and wireless broadband at maximum speed.

DonL · Posted: Sat Apr 14, 2007 7:06 pm Post subject:

Sure it may be that the Linksys 3G router is a pieced together router such that 57% of the upload only bandwadth is consitantly lost. The download is equal (actually about 5% less in router). Why 57% upload loss and only 5% download loss. Guess the upload piece must be a really bad mismatch???

Anyway, I ran the MTU tests that Linksys asked me to run and got an average of 57% loss on upload only with all settings 1500, 1492, 1400 and 1300. The only oddity was a series degradation in download at 1492 and 1400 but not consistantly? The Auto Selection (which chooses 1500) is where I returned the MTU setting to.

As far as OS's in the routers, research reveals the Linksys, DLink, and Junxion use linux and CISCO uses VX-Works. I would imagine that VX-Works would be the most effecient.

I cannot believe that this is anything but A FIRMWARE problem. The speeds we are talking about is reduction from 600-800 kbps to 250 kbps with downloads of 1.2 mbps being unaffected. Linksys makes cable routers running linux that is 6-8 mbps without degradation. Don't believe it is pieced together system with a bad OS but rather a simple FIRMWARE issue that Linksys shoud fix.

josw · EVDO User Joined: 06 Feb 2007 Posts: 66

Don L so you are having the same 1/2 speed upload problem with your Merlin S720 ? If so at least I now will know that my problem is just not limited to my PX 500.

DonL · Posted: Sat Apr 14, 2007 7:54 pm Post subject:

Yes. I have an S720 it is not your pantech card. It is not your tower as I have consistant drop from 500-700 kbps to 200-250 kbps upload while in the router. Amazing what a Mobile Wireless router plugged into an inverter can tell you.

glacierjima · Posted: Sat Apr 14, 2007 8:18 pm Post subject:

I've talked to 2 friends who are Cisco certified engineers who have both told me that, with firewall and other considerations on the router, maybe a 1/3 slower than the max it can do (also take into account the tower), but you should never see 50%-60%.
I'm curious, has anyone plugged this router into a dsl or cable modem and tried to test uploads that way? I'm curious if you get the same results, I would expect you would. If nobody has, I can take it to a friends and try it.

Jim

DonL · Posted: Sat Apr 14, 2007 8:42 pm Post subject:

I realized that I have a 'Firewall' enable/disable option on this router so I turned it off. I also checked that I was not doing any special filtering or routing (no static routes defined or MAC filtering).

Anyway I ran another test and got same result. 610 kbps in PC and 219 kbps in router. I do not have a cable or DSL connection but I did have another PC broadband card. A S620 Verizon service. Granted their service in my area is Rev 0 and I have only 3 bars but I got reduction of 50 kbps in PC to 22 kpbs in router...... Odd