Two new questions

[gripen]

I noticed something strange tonight, well its the same phenomenon as if you bring your modem to the front of your monitor (depending on monitor) ie. black ghosty lines on the display. My modem is roughly 0.6m away from my LG Flatron F700P (at 1600x1200@75Hz) and normally there is no interference. I noticed tonight that with the DC plug out (battery powered) its seemed to create interference while when the DC plug is in there is none. So my question is, why is this? Does the modem use more transmit power in battery mode or what? So running on the batteries effectively pushes up the radiation (read: frying the brain)

Secondly, I want to know if there is a way to test absolute packet loss as in real BER or loss statistics for all data not just every 50th packet chosen for ping. The point is to see whether this correlates with 5-10% loss since my skype and VNC performance really sucks. I would think it would be more like 40% but thats a guess. I still havent tried it in low loss times (these are rare but do happen)

 

[Kai]

hmmm... i noticed that on our TV as well... thin black lines running across it...

but our TV is on the other side of the house?

odd...

I haven't lost my mind... It's backed up on disk somewhere...

 

[TheRoDent]

Greedy, to answer question no 2:

You need to use the typical ICMP pings to detect packet loss. Seeing as how all traffic sent out the PPP interface is packetized, it's the only real measurement of loss that's relevant.

If you get lost packets say, 3/10 then that's your packet loss, regardless of whether you're using VNC or not. TCP makes use of the same underlying IP layers as ping does, so a lost ICMP packet would equal a lost TCP/IP packet. TCP will just retransmit automagically to correct the loss of the packet.

As with any MAC layer (Ethernet, etc) media loss is sometimes unavoidable and it's up to the higher layer protocols to correct it.

The modem itsself doesn't have any hardware statistics on lost, or retransmitted packets, but like I said, the only one that really matters to you is what happens on the IP/PPP level. Knowing what goes on at the lower levels won't really help at all.

The best you can do is to use Proasm's proggy and attempt to maximize signal, and minimize noise.


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