[vortex] Sorry to trouble you, I wonder if you could help me.
Wed Apr 17 15:55:01 2002
On Wed, 17 Apr 2002, Bogdan Costescu wrote:
> On Wed, 17 Apr 2002, [big5] biwu.xie [ÁÂ¥²ªZ] wrote:
> > 1) what are MAC loopback and PHY loopback?
[[ I answered this one privately earlier today. ]]
> > 2) I know that remote loopback can check PHY/MAC level loop back for each
> > layer health. But how to do remote loopback?
> Uh, what is a "remote loopback" ?
Loopback past the PHY (transceiver). It used to be implemented with a
relay or a physical plug. Picture a RJ45 with a 2" loop of wire feeding
the Tx back to the Rx pair.
Donald Becker firstname.lastname@example.org
Scyld Computing Corporation http://www.scyld.com
410 Severn Ave. Suite 210 Second Generation Beowulf Clusters
Annapolis MD 21403 410-990-9993