> From: Dan Siemon <[email protected]> > My VDSL2 modem (Alcatel Cellpipe 7130) shows: > Upstream line rate: 7344 kbps > Bearer Upstream payload rate: 6560 kbps > > Can you shed some light on what causes the difference? Is it the 65/64 > encoding and error correction overhead? I assume this does not take into > account things like the 802.3 header.
Well, a modem can say anything it likes, but 'bearer' is the term in the standard for the layer below PTM or ATM. So the difference probably includes error correction overhead, and a little bit for the two modems to talk to each other, but not either 65/64 encoding or 802.3 headers, both of which subtract off the 6560 kbps. In theory, the line rate can also be split between multiple bearers. Alex _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
