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Chapter 1: Overview
18
Ports
The AT-GS950/16 and AT-GS950/24 Layer 2 Gigabit Ethernet Switches
feature 16 or 24 twisted pair ports and two slots for optional SFP
transceivers.
Twisted Pair
Ports
The twisted pair ports are 10Base-T, 100Base-TX, and 1000Base-TX
compliant. They automatically set their speed and duplex mode with IEEE
802.3u Auto-Negotiation. If desired, you can disable Auto-Negotiation on a
port and manually set the speed and duplex mode.
Note
If a switch port is connected to an end node that is not using Auto-
Negotiation, you should disable Auto-Negotiation on the port and set
its speed and duplex mode manually. Otherwise, a duplex mode
mismatch might occur.
The twisted pair ports feature 8-pin RJ-45 connectors. For the port
pinouts, refer to “Connectors and Port Pinouts” on page 42.
The ports have a maximum operating distance of 100 m
(328 feet). For 10 Mbps operation, the ports require Category 3 or better
100 ohm shielded or unshielded twisted pair cabling. For 100 or 1000
Mbps operation, the ports require Category 5 or Enhanced Category 5
(5E) 100 ohm shielded or unshielded twisted pair cabling.
Also featured on the ports is auto-MDI, which automatically configures the
ports as MDI or MDI-X. This allows you to use straight-through twisted pair
cable regardless of the configuration of the ports on the end nodes.
Uplink Combo
Ports
The switch has two pairs of uplink ports, each consisting of one 10/100/
1000Base-T twisted pair port and one slot for an optional SFP transceiver.
The ports are numbered 15 and 16 on the AT-GS950/16 Switch and 23
and 24 on the AT-GS950/24 Switch.
You can use one port in a combo pair at a time. A link on an SFP
transceiver takes precedence over a link on a 10/100/1000Base-T twisted
pair port in the same combo pair. If the SFP slot is empty or if it has an
SFP module but the module does not have a link to an end node, the
10/100/1000Base-T twisted pair port of the pair is active. If an SFP
transceiver is installed and has a link to an end node, the twisted pair port
in the pair is inactive.
RS-232 Console
Port
The RS-232 console port is for local management of the switch with the
AT-S79 Management Software. Local management uses the
management cable supplied with the switch.