Dial-up disconnections

This is a frustrating dial-up connection bug that I have not been able to solve for a long time. When I start up my iMac G5 with 10.4.3 and want to get online, I wait until the starting up processes have finished. A few seconds after my desktop and GUI shows up, I go to connect to the internet (there is no cable/DSL/BPL available here). For the first 30 seconds of the connection, I can browse fine, but then my connection stalls for 60 seconds so that I have zero transfer speed, and then at the 90th second or so, I am either disconnected, or my connection resumes back to regular speed interrupted from there on. If I get disconnected, then once I connect again, I stay connected. (For shortcut purposes, I'm going to call this unusual stalling and potential disconnection sequence "The Problem.") If I try to connect anywhere between 5 and 300 seconds after the desktop and GUI are displayed, then The Problem exists, whereas if I wait at least 5 minutes, The Problem does not occur. The Problem occurs, also, if I try to get on the internet (I think) 5 to 300 seconds after I wake my computer up from sleep.
Background information:
[1] The Problem did not exist in Jaguar 10.2.x.
[2] The Problem first appeared in Panther 10.3.x seemingly out of the box, because even with a fresh erase and install, it existed. It has continued through Tiger.
[3] The Problem exists on nearly all computers that can run Tiger, since even my PowerMac G4 Cube experienced it with Panther.
[4] The Problem is not corrected on Panther or Tiger by varying the PPP or Network settings to as many combinations as I can think of.
Reason for posting:
The Problem is both difficult to circumvent, tough to identify the cause, and frustrating to work with. I want it resolved.
(By the way, I posted a thread about The Problem back in July of 2005, and it received about 20 responses, some from myself, many from others who mentioned what they tried with Apple over the phone and how it worked out. Yet the thread has been deleted, since I can't find it anywhere. Who deleted it, and why?)

That is a very strange problem; in all my use of dialup I have not seen something like that, but I can imagine it happening if there would be, for example, a problem with either peer's negotiation resulting in rejected protocols or a problem with the data passed up from the modem driver. Or something else. Without seeing pppd debug logs*, kernel ppp debug logs** or a packet trace* it's hard to say.
I would sign up for a free online ADC account and file a bug report that includes lots of details about what you see, any error messages, system and connection logs (be sure to use verbose logging), your machine(s) configuration(s), and any other information you suspect may be relevant. It's likely it hasn't been fixed because it's never been reported to Apple in a form that can be reproduced. You might want to look at this for helpful tips on how to file effective bug reports.
As noted in the help documentation for these discussions, posts are removed after a certain amount of time.
* - Enable verbose logging. Editing /etc/ppp/options as root and adding additional debug (e.g. debug debug) often gives more info.
** - Editing /etc/ppp/options as root and adding kdebug 7 shows kernel level PPP debug in system.log. Makes syslog very big! See pppd man page for details.
* - Running tcpdump on the ppp link to see the traffic between your machine and the peer can sometimes shed light on these issues.

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