GarrettCom MAGNUM H80B - Manual (Page 24)

Magnum H80B and H80P Personal Hubs User Guide (07/95)
GARRETT
20
3.6 Switchable Up-Link Feature
Each H80B and H80P Personal Hub is equipped with one
MDI-X Up-Link crossover switch, connected to the right-most front
RJ-45 port (port 8). This switch is used to select either a normal
10BASE-T connection to a user device (switch in the "==" position)
or a 10BASE-T network up-link connection to another hub or
concentrator (switch in the "X" position). A special crossover cable
for up-links is not needed with Personal Hubs because of this built-in
up-link switch feature.
When the switchable port is wired for up-link but the
switch is set to the == position, the up-link segment is inoperative
and full bandwidth is available locally.