Data transfer over internet

While waiting foe Software Updates to download, I used Activity Monitor
to calculate downloading.
With iPod update-

Total Update-41.8 MB
Average Downloading-36.4 KB/second

Using Activity Monitor-

Averaged over 5 seconds-
IN 38 to 39 packets/second
54 to 55 KB/sec
OUT about 20 packets per second
1,28 to 1.29 KB/sec

Averaged over 1/2 seconf-
Interesting pattern with small gaps every 6 packets ?

As this is a DUPLEX transfer, data is 100% accurate- has to be.
This would be from a local mirror using broabband telephone connection
to a local exchange some 1 kilometer away.

Later, I will log a QT download from APPLE to compare a SIMPLEX
transfer.

I remember a story I heard many years ago when doing R&D-

At a monistary, a group of monks were trying to find out how many teeth
a donkey had. After much deliberation, no consensus was reached.
Suddenly, a new monk suggested that they go out and COUNT the number of
teeth in a REAL donkey. He was IMMEDIATELY expelled !

Seems somewhat familiar happens in GROUPS ?

Ernie Lee

Tom Stiller wrote:
> In article <1151619158.707183.225760 DeleteThis @y41g2000cwy.googlegroups.com>,
> erniemac DeleteThis @comcen.com.au wrote:
>
> > While waiting foe Software Updates to download, I used Activity Monitor
> > to calculate downloading.
> > With iPod update-
> >
> > Total Update-41.8 MB
> > Average Downloading-36.4 KB/second
> >
> > Using Activity Monitor-
> >
> > Averaged over 5 seconds-
> > IN 38 to 39 packets/second
> > 54 to 55 KB/sec
> > OUT about 20 packets per second
> > 1,28 to 1.29 KB/sec
> >
> > Averaged over 1/2 seconf-
> > Interesting pattern with small gaps every 6 packets ?
> >
> > As this is a DUPLEX transfer, data is 100% accurate- has to be.
> > This would be from a local mirror using broabband telephone connection
> > to a local exchange some 1 kilometer away.
> >
> > Later, I will log a QT download from APPLE to compare a SIMPLEX
> > transfer.
> >
> [story snipped]
>
> I don't think I understand the point of this post. When computing data
> transfer, are you counting total bits transferred or net data
> transferred?
>
> When you emphasize *duplex* vs. *simplex* are you distinguishing between
> full and half duplex or do you really mean a true one-way transmission?
> If the latter, where do you get a one-way transfer from an Apple
> download server?
>
> --
> Tom Stiller
>
> PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3

In ye olden days, SIMPLEX was one way transmission with no check of
accurracy using checksums.

DUPLEX checked accuracy of data using checksums. If a packet failed a
checksum, then a request was sent back to the sender to retransmit that
packet ! This process repeated until accuracy was obtained or
"transmiission failed" signal was sent.

Any further advances on this very old method for data transmission ?

I might go back and read your ASCI2 code !
Ernie Lee