I don't completely understand what you've said in the above 3 messages, but just to make sure...
The biggest PID#s of any type that is possible on any DVB stream is &H1FFF=8191
Those numbers you saw somewhere that were like 16437, etc, were not valid PID#s . The PBS audio PIDs were never 5 digit numbers, they have always been 2 and 3 digit numbers.
I _THINK_ you said that you now understand this, but I'm not sure.
I have had a couple versions of pirate software on my 8100 in the past, back when the factory firmware had some very serious problems, but took it off when the factory firmware was fixed. I never observed what you described with the PID#s, and most of the time, the PBS transponders were the only transponders I had programmed in.
NOW, however, what I _THINK_ those 5 digit PID#s were caused by, is that I think the firmware is using another hex character to tell the receiver that that PID represents AC3 audio. My guess is caused by observations I made with my Diamond-9000 channel editor.
With the Diamond 9000, you can't create manual PID channels with AC3 audio or MPEG4 video via the remote either, however with the channel editor, you can enter AC3 audio at least. But I experimented trying to enter mpeg4 channels manually vs scanning them in, and observed what PIDs were listed in the 9000's channel editor, and found that say, if a channel had a VPID of 32, which is &H0020 in hex, that the Diamond would enter a number of &H4020 if the video happened to be MPEG4. The number &H4020=16416 . If the video was regular mpeg video, it would just use &H0020 = 32 . So I found that even though neither the Diamond firmware nor the channel editor had any option to manually create an MPEG4 channel, I found that I could do it by just adding &H4000 to whatever hex number the video PID was.
I suspect that your Coolsat 8100 is probably doing something similar with the audio PIDs, ie adding a hex character to tell the receiver to use AC3 audio. It's too bad that there isn't any channel editor that works with the 8100, or else we might be able to play similar tricks with it like I did with the Diamond 9000.
BTW, I'm pretty sure that the &H4000 number has no significance, and doesn't exist in the actual sat signal. The actual hex character representing MPEG4 video there, is 1B not 4000. I think it's a number that only has significance to how the receiver stores it's channel data.
Anyway, although you can't really do much with the info, I'm guessing that's where those 5 digit numbers were coming from. Why you're seeing them, I don't know, as I sure don't remember ever seeing them on my 8100, even when I had some pirate software in there when it was the only way to keep my 8100 from freezing and/or rebooting, after a trip back to the dealer wouldn't solve the problem.