3-16
Catalyst 4948E and Catalyst 4948E-F Switch Installation Guide
OL-21561-02
Chapter 3 Installing the Switch
Attaching the Interface Cables
Connecting to the Downlink Ports
Both chassis have 48 10/100/1000 ports. The ports configure themselves to operate at the speed of the
attached devices. If the attached devices do not support autonegotiation, you can explicitly set the speed
and duplex parameters.
To attach network cables to the downlink ports, follow these steps:
Step 1 Connect the RJ-45 plug at one end of the network cable to the target device port.
Step 2 Connect the RJ-45 plug at the other end of the network cable to a downlink port on the Catalyst 4948E
chassis.
Step 3 Repeat Steps 1 and 2 for the remaining downlink ports.
Installing Uplink Port Transceivers and Cables
The four uplink ports on the Catalyst 4948E support either 1000BASE-X SFP or 10GBASE SFP+
transceivers. SFP transceivers can have three types of latching devices to secure an SFP transceiver in a
port socket:
• Figure 3-7 shows an SFP transceiver with a Mylar tab latch.
• Figure 3-8 shows an SFP transceiver with an actuator button latch.
• Figure 3-9 shows an SFP transceiver that has a bail-clasp latch.
Determine which type of latch your SFP transceiver uses before following the installation and removal
procedures.
Caution Do not install or remove the SFP transceiver with fiber-optic cables attached to it. Doing so may damage
cables, cable connectors, or the optical interfaces and may interfere with the SFP transceiver latching
properly into its socket connector. Disconnect all cables before removing or installing an SFP
transceiver.
Removing and installing an SFP transceiver can shorten its useful life. Do not remove and insert SFP
transceivers more often than is absolutely necessary.
Caution The SFP transceivers are static-sensitive devices. Always use an ESD wrist strap or similar individual
grounding device when handling SFP transceivers.
Figure 3-7 SFP Transceiver with a Mylar Tab Latch
63065