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3-14
Cisco Catalyst 4900M Switch Installation Guide
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Chapte r 3 Installing the Switch
Optical Connections
You should also check the chassis front panel LEDs:
• The PS1 or PS2 LED is green.
• The PS1 or PS2 LED is red when the power supply is not functioning normally.
• The PS1 or PS2 LED is off when the power supply is not connected to a power source.
From the system console, enter the show power command to display the power supply and system status.
For more information on this command, see the command reference publication for your software
release.
If the LEDs or show power command indicate a power problem or other system problem, see Ch apte r 4,
“Troubleshooting the Installation,” for troubleshooting information.
Optical Connections
The Cisco 4900M switch has up to 24 po rts th at can be configured with X2 modules with SC connectors.
Module types supported are documented at:
http://www.cisco.com/en/US/docs/interfaces_modu les/transceiver_modules/compatibility/matrix/OL_
6974.html
Generic connection instructions for the X2 modules are at:
http://www.cisco.com/en/US/docs/interfaces_modu les/transceiver_modules/installation/note/OL_2358
9.html
Installation documentation for Cisco TwinGig converter modules can be found at:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750e_ 3560e/hard ware/install/notes/1757202.h
tml
Configurable Modules
All Catalyst 4900M modules support hot swapping, which lets you install, remove, replace, and
rearrange switching modules without turning off the system power. When the system detects that a
switching module has been installed or removed, it runs diagnostic and discovery tests automatically,
acknowledges the presence or absence of the module, and resumes system operation with no operator
intervention.
This section describes the following topics:
• Required Tools, page 3-15
• Removing Switching Modules, page 3-15
• Installing Switching Modules, page 3-17

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