Cisco Catalyst 2950 Hardware Installation Manual page 113

Chapter 3 Installation
On the Catalyst 2950 LRE switches, the four input uplink ports are bundled as two
Note
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
uplink logical ports.
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:
Caution To comply with the intrabuilding lightning surge requirements, intrabuilding
wiring must be shielded, 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
Caution
only for intrabuilding or nonexposed wiring connections.
78-11157-05
"SFP Module Slots" section on page 2-14
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.
Catalyst 2950 Desktop Switch Hardware Installation Guide
Connecting to 10/100 and 10/100/1000 Ports
for more information on LRE
3-33