Hardware Description
2–11
Setting Autonegotiation
The factory default for all of the DEL8X ports is autonegotiation. Therefore, if the device to
be attached to the switch also supports autonegotiation, or runs at half
²duplex mode, you
do not need to manually set the communication mode. If autonegotiation fails, the
transmission mode will be set to half
²duplex operation. To restore autonegotiation after
manually configuring the transmission mode, unplug the connector from the concerned
port on the DEL8X, then plug it back in again.
Note that any disruption in the link signal will cause a port to be reset to autonegotiation.
For example, if you reset power to an attached device or it encounters a power fluctuation,
the port will be reset to autonegotiation. Therefore, if any device attached to the DEL8X
must run at full
²duplex, but does not support autonegotiation, you may want to upgrade the
device.
Full–duplex operation applies only to point–to–point access (for example, when attaching
the DEL8X to a PC, workstation, server, or another switch). Repeater hubs use a common
collision domain for all communications, and therefore cannot support full–duplex mode.
When connecting the DEL8X to a repeater hub, use a standard cascaded connection set for
half–duplex communications.
Ethernet Ports
The front panel on the DEL8X contains eight 8
²pin MJ crossover²wired (x) Ethernet
station ports
and one additional straight²wired (8//) port for configuring a daisy²chain
connection. Each port is attached to a dedicated collision domain, all of which are
interconnected using a high
²speed switching fabric. These ports are shown in the following
figure and described in the following sections.
2
1
1X
2X
3X
4X
5X
6X
7X
8X
or
8//
10M/100M
LJ-5451.AI4