[vortex] Sorry to trouble you, I wonder if you could help me.

Bogdan Costescu bogdan.costescu@iwr.uni-heidelberg.de
Wed Apr 17 13:57:02 2002

On Wed, 17 Apr 2002, [big5] biwu.xie [¥Z] wrote:

> 1) what are MAC loopback and PHY loopback?

AFAIK, a loopback means that the Tx path is wired to the Rx path, so that 
whatever is sent comes back immediately. The fact that you have them 
integrated on the card makes easy to test both paths without the need for 
an external device.

> 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" ?

>    Wish you can give me some experience and documents about them.

You can always register for free as a developer on the 3Com site and have 
access to the documentation in PDF format. That's all I have, anyway.

Bogdan Costescu

IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
E-mail: Bogdan.Costescu@IWR.Uni-Heidelberg.De