Problemy s 3COM 905C

[Jaroslav Stefka]

> >> Osobne mam v posledni dobe pocit, ze nastaveni autodetekce je rozumne,
> >> protoze ty lepsi zarizeni se dokazou dohodnout.

V manualu k prepinaci HP2524 se ohledne tohoto problemu pise toto:

Connecting to devices that have a fixed configuration:
Connecting with the fixed RJ-45 ports: The Series 2300 and 2500 fixed RJ-45 ports
have a default configuration of Auto. That is, when connecting to attached devices, the
switch will operate in one of two ways to determine the link speed and the communication
mode (half duplex or full duplex):

- if the connected device is also configured to Auto, the switch will automatically negotiate
link speed, communication mode, and flow control and a valid link should occur

- if the connected device has a fixed configuration, for example 100 Mbps, at half or full
duplex, the switch will automatically sense the link speed, but will default to a communication
of half duplex

Because the Series 2300 and 2500 switches behave in this way (in compliance with the IEEE
802.3 standard), if a device connected to the switch's fixed RJ-45 ports has a fixed
configuration at full duplex, a duplex mismatch occurs between the switch and the
connected device. The result will be high error rates and very inefficient communications
between the switch and the device.

Make sure that all devices connected to the fixed RJ-45 ports on the Series 2300 and 2500
switches are configured to auto negotiate, or are configured to connect at half duplex (all
hubs are configured this way, for example).

J. Stefka