Connecting To 10/100 And 10/100/1000 Ports - Cisco WS-C2950T-48-SI Hardware Installation Manual

Catalyst 2950 series switch
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Chapter 2
Installation

Connecting to 10/100 and 10/100/1000 Ports

The 10/100 ports configure themselves to operate at the speed and duplex settings of attached
devices.They operate at 10 or 100 Mbps in half- or full-duplex mode. If the attached devices do not
support autonegotiation, you can explicitly set the speed and duplex parameters.
The 10/100/1000 ports configure themselves to operate at the speed setting of attached devices. These
ports on Catalyst 2950T-24 switches operate at 10, 100, or 1000 Mbps in full-duplex mode. The
10/100/1000 ports on Catalyst 2950 LRE and Catalyst 2950T-48-SI switches operate at 10 or 100 Mbps
in either half- or full-duplex mode and at 1000 Mbps only in full-duplex mode. If the attached devices
do not support autonegotiation, you can set the speed.
Note
On the Catalyst 2950 LRE switches, the four input uplink ports are bundled as two logical ports, each
consisting of a copper 10/100/1000 port and a fiber-optic SFP module slot, respectively.
Within each logical port, you can use only the copper or the fiber-optic port at one time. If the Catalyst
2950 LRE switch senses more than two connections for both logical ports, by default, the switch chooses
the fiber-optic connections over the copper connections.
See the
Connecting devices that do not autonegotiate or devices with manually set speed and duplex parameters
can reduce performance or result in link failures between the devices. To maximize performance, choose
one of these methods for configuring the ports:
When connecting the ports on the Catalyst 2950G-24-EI-DC and Catalyst 2950ST-24 LRE 997 switches
to other devices, follow these guidelines:
To comply with the intrabuilding lightning surge requirements, intrabuilding wiring must be shielded,
Caution
and the shield for the wiring must be grounded at both ends.
The Catalyst 2950G-24-EI-DC or Catalyst 2950ST-24 LRE 997 switch is suitable only for intrabuilding
Caution
or nonexposed wiring connections.
Follow these steps to connect the switch to 10BASE-T, 100BASE-TX, or 1000BASE-T devices:
Caution
To prevent electrostatic-discharge (ESD) damage, follow your normal board and component handling
procedures.
OL-6156-01
"SFP Module Slots" section on page 1-11
Let the 10/100 ports autonegotiate both speed and duplex, let the 10/100/1000 ports on the LRE
switches autonegotiate both speed and duplex, and let
the 10/100/1000 ports on the Catalyst 2950G-24-EI-DC switch only autonegotiate speed.
Set the speed and duplex parameters on both ends of the connection.

Connecting to 10/100 and 10/100/1000 Ports

for more information on LRE uplink logical ports.
Catalyst 2950 Switch Hardware Installation Guide
2-27

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