Alexander Pevzner wrote:
For ADSL I believe the constant C is noticeably smaller that for Ethernet
The unusable per-packet overhead is, for obvious reasons, engineered to
be lower on expensive long-haul link technologies than it is on cheap
high-bandwidth LAN technologies. ADSL, for instance, usually puts your
packets into ATM cells, so there's no more than 47 wasted bytes of
padding per packet, though there is extra overhead for each 48-byte cell
that is transmitted. From your local CO, the same ATM framing stays in
effect until IP aggregation. At peering points and for long-haul
transport, ATM is often used, or POS (packet-over-SONET, which is simply
PPP over SONET). And PPP, whether on a low-speed modem line or over
SONET adds just a few bytes of framing overhead for each packet.
Matthew Kaufman
[EMAIL PROTECTED]
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