Installation Instructions

Chapter 1: Overview

or unshielded twisted pair cabling.

The ports feature auto-MDI, which automatically configures the ports as

MDI or MDI-X. This feature allows you to use straight-through twisted pair

cables regardless of the wiring configurations of the ports on the end

nodes.

Note

A switch port connected to an end node that is not using Auto-

Negotiation should not use Auto-Negotiation to set the speed and

duplex mode, because a duplex mode mismatch might occur. You

should disable Auto-Negotiation and set the port’s speed and duplex

mode manually.

Combo Ports

The AT-GS950/8 and AT-GS950/16 Switches have two combo ports and

the AT-GS950/24 Switch has four combo ports. Each combo port consists

of one 10/100/1000Base-T twisted pair port and one slot for an optional

100Base-FX or 1000Base-SX/LX SFP transceiver. The twisted pair ports

are identified with the letter “R” for “Redundant” on the front faceplates of

the units. The ports and slots are listed in Table 1.

The combo ports have the guidelines listed here:

 Only one port in a pair — either the twisted pair port or

a corresponding SFP module — can be active at a

time.

 The twisted pair port is the active port when its SFP

slot is empty, or when an SFP module is installed but

Table 1. Combo Ports

Switch Twisted Pair Port SFP Slot

AT-GS950/8 7R 7

8R 8

AT-GS950/16 15R 15

16R 16

AT-GS950/24 21R 21

22R 22

23R 23

24R 24