[Asterisk-Users] Re: Snom firmwares suck <--additional datapoint to consider

[Benny Amorsen]

>>>>> "RA" == Rich Adamson <radamson at routers.com> writes:

RA> That's a total crock. There isn't any such thing as "other side
RA> doesn't answer" for speed & duplex negotiation.

Of course there is. Each side advertises which speed and duplex
settings it supports, and so they pick a setting which both support.
On a few devices (such as Linux with some network cards) you can
influence which settings are advertised, but in the vast majority of
cases you can only turn autonegotiation off completely.

If you turn autonegotiation off completely, the other end has no
chance to guess your duplex setting (the speed setting can still be
guessed, simply by trying each until there is link). Therefore the
other end assumes you are a stupid hub and picks duplex.

Some devices have proprietary methods for guessing duplex settings
when autonegotiation is off, but they don't comply with the standard.

RA> Both ends are totally and 100% independent of each other, and
RA> happens way before any layer two or three communications functions
RA> being available.

This is not a layer 2 or layer 3 thing.


/Benny