3Com OFFICECONNECT ETHERNET HUB 8, Руководство пользователя, Страница: 21 / 130

Posi t ion ing the Office Connect H ub 2-5
In order to comply with the 10BASE-T standard, ports
designed for workstation connections have been
marked with the graphical symbol ‘x’. This denotes a
crossover in the port’s internal wiring, for example 1x,
2x, 3x...
Hub Connections
If you have additional hubs you want to connect
using 10BASE-2 (Coax), you need:
■
One 10BASE-2 50 Ohm cable for each additional hub.
The minimum cable length you can use is 0.5 meters
(1.6 feet). The maximum segment length you can
have is 185 meters (607 feet).
■
One 10BASE-2 ‘Y’ piece for each hub. You can use ‘T’
pieces but ‘Y’ pieces provide adequate clearance of
the other ports.
■
Two 10BASE-2 50 Ohm terminators ( end pieces ).
If you have additional hubs you want to connect
using 10BASE-T, you need:
■
One ‘Straight-through’ 10BASE-T cable for each
additional hub.
Posi t ion ing the Office Connect H ub
When installing your OfficeConnect hub, ensure:
■
It i s out of direct sunlight and away from sources of
heat.
■
Cabling is away fro m power lines and fluorescent
lighting fixtures, and so urces of electrical noise such
as radios, transmitters and broadband ampli fiers.
■
Water or moisture cannot enter the case of the unit.
■
Air flow around the unit and through the vents in the
side of the case is not restricted. We recommend
you provide a minimum of 25.4 mm (1 in) clearance .
16710.bk : CREYRNET.FRM Page 5 Tuesday, October 7, 1997 11:38 AM