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1-12
Cisco Catalyst 4900M Switch Installation Guide
78 -18 35 0- 0 2
Chapter 1 Product Overview
Catalyst 4900M Half-Card Modules
Note TwinGig converter modules may be installed in place of X2 transceiver modules if you need 1-GB SFP
transceiver connections. When you insert the TwinGig into one port, its neighbor port automatically
converts to 1 GE interfaces whether it has a TwinGig installed or not, so you must position your TwinGig
converters next to each other. The neighbo ring port to a TwinGig port cannot support an X 2. Ins tallation
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
Note When using TwinGig converters and X2 transceivers on this module, keep them grouped in pairs as
follows: ports 1–2, ports 3–4, ports 5–6 and ports 7–8. Inserting a TwinGig converter or X2 transceiver
in any port will affect the capability of its neighbor port, and both will be set to handle the same type
automatically. Mixing within a port group does no t work. As an example, you would n ot be able to have
an X2 transceiver in port 1 and a TwinGig converter in port 2.
Cable type MMF or SMF (optical) or Category 5 or Category 6
(copper)
Cabling distance Dependent on the type of X2, SFP, or SFP+
transceiver installed
Pluggable transceivers
support
• X2 transceivers
• SFP+ transceiver (using a Cisco OneX converter
module)
• SFP transceiver (using a Cisco TwinGig converter
module)
Module upgrades
available
None
Power over Ethernet Not supported
Table 1-6 WS-X4908-10GE Half-Card Ethernet Module Specifications (continued)
Specification Description

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