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Cisco Catalyst 4900M Switch Installation Guide
78-18350-01
Chapter 1 Product Overview
Switch Components
• 512-MB SDRAM (fixed)
• 128-MB embedded Flash memory
• 360-Gbps switching capacity, 250 million packets-per-second actual
forwarding rate
• EtherChannel at 10/100/1000 Mbps, as well as 10 Gbps
• Host and device USB 2.0 ports
• Compact flash memory slot
Switch Components
This section describes the Catalyst 4900M hardware components.
Traffic Ports
There are eight 10-Gigabit Ethernet uplink ports using X2 interfaces and other
traffic ports depending on the switching modules installed.
TwinGig Modules
On the WS-4908-10GE modules only, TwinGig converter modules may be used
in place of X2 modules if you need to provide 1 GB SFP connections. When you
insert the TwinGig into one port, its neighbor automatically converts to 1 GE
interfaces whether it has a TwinGig installed or not, so you need to group your
TwinGigs next to one another. The neighboring port to a TwinGig port cannot
support an X2.
Installation documentation for Cisco TwinGig converter modules can be found at:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750e_3560e/hardware/i
nstall/notes/1757202.html
