Re: I-D ACTION:draft-ietf-tcpsat-stand-mech-00.txt

From: Francesco Potorti` ([email protected])
Date: Tue Oct 07 1997 - 06:17:00 EDT


I am reposting this, as I believe I sent it to the wrong address.
Apologizes for multiple copies.

Some comments on the new draft:

    (GSO) with an altitude of approximately 36,000 km [Sta94]. At this

It could be pointed out that the acronym GEO is used by many instead
of GSO.

        it's destination. This results in a low signal-to-noise ratio.

Typo. Should be "its".

        The delay*bandwidth product (DBP) defines the amount of data a
        protocol should have "in flight" (data that has been
        transmitted, but not yet acknowledged)

The delay*bandwidth product is the amount of data transmitted, but not
yet received. The amount of data "transmitted, but not yet
acknowledged" is twice that quantity.

        transfered from one satellite to another or from one ground

Typo. Should be "transferred".

    For TCP to operate efficiently, the channel characteristics should be
    such that nearly all loss is due to network congestion. The use of
    forward error correction coding (FEC) on a satellite link should be
    used to bring the performance of the link to at least fiber quality.

Is this reasonable? What is fiber quality? Are we implying that tcp
over satellite will only work for practically error-free channels?
What about the Ka band, where atmospheric attenuation due to rain is
common and most certainly causes long periods of degraded channel
quality?

A nice work, thanks for your efforts.

-- 
Francesco Potorti` (researcher)        Voice:    +39-50-593203
Computer Network Division              Operator: +39-50-593211
CNUCE-CNR, Via Santa Maria 36          Fax:      +39-50-904052
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