Allied Telesis AT GS900/8POE, Руководство по установке

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AT-GS900/8POE Gigabit Ethernet Switch Installation Guide
17
Port Descriptions
The following sections describe the types of ports on the AT-GS900/8POE
Gigabit Ethernet switch:
ˆ
“Twisted Pair Ports,” next
ˆ
“SFP Combo Port” on page 18
Twisted Pair
Ports
The AT-GS900/8POE Gigabit Ethernet switch features eight 10/100/
1000Base-T twisted pair ports.
The twisted pair ports feature 8-pin RJ-45 connectors. For the port pinouts,
refer to “RJ-45 Twisted Pair Port Connectors” on page 51.
The ports are 10Base-T, 100Base-T, and 1000Base-TX 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 100 Mbps, the switch sets the
port connected to the end node to 100 Mbps.
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.
Each twisted pair port has a maximum operating distance of 100 m
(328 feet).
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.
All of the twisted pair ports on the switch are auto-MDI and IEEE 802.3ab-
compatible. When a 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.
The ports can operate as either standard 10/100/1000Base-T ports or as