Cables and Connectors
Gigabit Ethernet Interfaces
Gigabit Ethernet SFP Modules
The 40-Port Gigabit Ethernet (GE) line card and the Gigabit Ethernet ports of the 2-Port 10 GE + 20-Port GE
combination line card use SFP modules. The Gigabit Ethernet laser optical transceiver module is a
field-replaceable small form-factor pluggable (SFP) module that plugs into the receptacle (or cage) located
on the line card and provides the Gigabit Ethernet optical interface (see the figure below). The module has
two optical interfaces—laser transmit (TX) and laser receive (RX)—and an electrical interface (to the line
card).
The SFP+ modules used on the 16-Port 10GE oversubscribed line card are enhanced SFP modules.
Figure 82: SFP Module and Fiber-Optic Cable
Receive (RX)4Component side of line card1
Top surface of SFP module5EMI gasket2
Transmit (TX)3
The SFP modules have LC connectors. The only restriction is that each port must match the specifications on
the other end of the cable (short or long wavelength), and must not exceed the recommended cable length for
reliable communication.
Fiber-optic transmission specifications identify two types of fiber: single-mode (SMF) and multimode (MMF).
The maximum distance for single-mode installations is determined by the amount of light loss in the fiber
path. If your environment requires the light to travel close to the typical maximum distance, you should use
an optical time domain reflectometer (OTDR) to measure the power loss.
Cisco ASR 9000 Series Aggregation Services Router Ethernet Line Card Installation Guide
129
Installing and Removing Line Cards and Transceiver Modules
Cables and Connectors
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