AT-GS905 Gigabit Ethernet Switch Installation Guide
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Hardware Feature Description
The following sections describe hardware features of the AT-GS905
Gigabit Ethernet switch:
System and Port LEDs
Twisted Pair Ports
AC Power Connector
Twisted Pair
Ports
The AT-GS905 Gigabit Ethernet switch features five twisted pair ports.
Type of Connector
The twisted pair ports feature 8-pin RJ-45 connectors. (For the port
pinouts, refer to
RJ-45 Twisted Pair Port Pinouts
on page 35.
Speed
The ports are 10Base-T, 100Base-TX, and 1000Base-T compliant and are
capable of 10 megabits per second (Mbps), 100 Mbps, and 1000 Mbps
speeds. The ports are IEEE 802.3u Auto-Negotiation compliant. With
Auto-Negotiation, the switch automatically matches the highest
possible common speed between each switch port and each end-node.
For example, if an end-node is capable of only 10 Mbps, the switch sets
the port connected to the end-node to 10 Mbps.
Duplex Mode
Each twisted pair port on the switch can operate in either half- or full
duplex mode. The twisted pair ports are IEEE 802.3u-compliant and will
Auto-Negotiate the duplex mode setting.
Note
In order for the switch to set the duplex mode for each port
correctly, the end-nodes that you connect to the switch ports
should also use Auto-Negotiation. Otherwise, a duplex mode
mismatch can occur, affecting network performance. For further
information, refer to
Duplex Mode
on page 17.
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.
