User's Manual

1-12
Cisco Catalyst 4900M S witch Inst allati on Guide
78-18350- 0 2
Chapter 1 Product Overview
Catalyst 4900M Half-Card Modules
Note TwinGig converter modules may be installed in place of X2 transc eiver 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 interfac es whether it has a TwinGig installed or not, so you m ust position your TwinGig
converters next to ea ch other. The neighbo ring port t o a TwinGig po rt cannot s upport a n X2. Ins tallation
documentation for Cisco TwinGig converter modules can be found at:
http://www. cisco. com/e n/US/ docs/s witche s/la n/cata lyst375 0e_ 3560e/h ardwar e/in stall/n otes /17572 02.h
tml
Note When using TwinGig converters and X2 transceiver s on this module, keep them groupe d 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 gr oup does no t work. A s an examp le, you w ould not be able to have
an X2 transceiver in port 1 and a TwinGig converter in por t 2.
Cable type MMF or SMF (op tical) or Categ ory 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 supporte d
Table 1-6 WS-X4908-10GE Half-Card Ethernet Module Specifications (continued)
Specification Description