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Chapter 1: Product Description
20
Maximum Distance
Each twisted pair port has a maximum operating distance of 100 m
(328 feet).
Type of Cabling
For 10 Mbps operation, Category 3 or better 100 ohm shielded or
unshielded twisted pair cabling is required. For 100 or 1000 Mbps
operation, Category 5 and Enhanced Category 5 (5E) 100 ohm shielded
or unshielded twisted pair cabling is required.
Auto MDI/MDI-X
All of the ports on the switch are auto-MDI and IEEE 802.3ab-compatible.
Since each port's speed and duplex mode are set through Auto-
Negotiation, the port uses the auto-MDI feature to automatically configure
itself as MDI or MDI-X when connected to an end-node. Consequently,
you can use either a straight-through or crossover twisted pair cable when
connecting any network device to a port.
Green Power Saving Ports
All Ethernet ports support the power saving functions including Link-Down
and Cable Length power savings. The greatest power savings occur when
all 8 ports’ linked status is down and the ports are inactive. The switch
uses the most power when all 8 ports are linked up to via Ethernet cables
that are the maximum length or 100 meters.
When a link is not established on an individual port, the switch controller
automatically reduces the power supplied to the port’s circuitry to an idle
level. The greater the number of ports that are not linked up results in a
greater cumulative power savings for the switch.
When a link is established on an individual port, the power provided to the
PHY circuitry is based on the length of the Ethernet cable that you connect
to the port. Full power is provided to the port’s circuitry if the cable length
is detected to be the maximum specified cable length or 100 m. If the
cable length is shorter than this, the switch senses the cable length and
reduces the available port power in proportion to the detected cable
length. This feature provides power efficiencies for the port even when it is
actively linked to another network device.