Re: Data transfer over internet


Tom Stiller wrote:
In article <1151619158.707183.225760@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
erniemac@xxxxxxxxxxxxx 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

.

Relevant Pages

  • Re: Data transfer over internet
    ... Tom Stiller wrote: ... 1,28 to 1.29 KB/sec ... Interesting pattern with small gaps every 6 packets? ... full and half duplex or do you really mean a true one-way transmission? ...
    (comp.sys.mac.system)
  • Data transfer over internet
    ... While waiting foe Software Updates to download, I used Activity Monitor ... 1,28 to 1.29 KB/sec ... Interesting pattern with small gaps every 6 packets? ...
    (comp.sys.mac.system)
  • Re: Data transfer over internet
    ... 1,28 to 1.29 KB/sec ... Interesting pattern with small gaps every 6 packets? ... I will log a QT download from APPLE to compare a SIMPLEX ... where do you get a one-way transfer from an Apple ...
    (comp.sys.mac.system)
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