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Cisco 10000 Series Routers Line Card Hardware Installation Guide
OL-6773-04
Chapter 10 1-Port Gigabit Ethernet Half-Height Line Card Overview
Cables and Connectors
The Coarse Wave Division Multiplexer (CWDM) Small Form-Factor Pluggables (SFPs) are
hot-swappable, laser optical transceiver modules. You can plug these SFPs into standard receptacles in
Cisco routers and switches to convert Gigabit Ethernet electrical signals into a single-mode fiber-optic
(SMF) interface. The router supports the following CWDM SFPs:
• CWDM-SFP-1470 SFP—Longwave 1470 nm laser, single mode
• CWDM-SFP-1490 SFP—Longwave 1490 nm laser, single mode
• CWDM-SFP-1510 SFP—Longwave 1510 nm laser, single mode
• CWDM-SFP-1530 SFP—Longwave 1530 nm laser, single mode
• CWDM-SFP-1550 SFP—Longwave 1550 nm laser, single mode
• CWDM-SFP-1570 SFP—Longwave 1570 nm laser, single mode
• CWDM-SFP-1590 SFP—Longwave 1590 nm laser, single mode
• CWDM-SFP-1610 SFP—Longwave 1610 nm laser, single mode
You can connect the CWDM SFPs to CWDM passive optical system optical add/drop multiplexer
(OADM) or multiplexer/demultiplexer plug-in modules using single-mode fiber-optic cables with
standard LC connectors. For more information, see the Cisco CWDM GBIC and CWDM SFP Installation
Note at the following URL:
http://www.cisco.com/univercd/cc/td/doc/product/gbic_sfp/gbic_doc/78_15222.htm
When shorter distances of single-mode fiber are used, it may be necessary to insert an inline optical
attenuator in the link to avoid overloading the receiver. A 5-decibel (dB) or 10-dB inline optical
attenuator should be inserted between the fiber-optic cable plant and the receiving port on the
GLC-ZX-SM= at each end of the link whenever the fiber-optic cable span is less than 25 km. CWDM
SFPs require a minimum of 12-dB optical attenuation. If the fiber itself is not providing the attenuation,
then an attenuator device is required.
Note The required line card SFP module is shipped installed in the line card. Cisco sells individual SFP
modules separately and you can change the type of Gigabit Ethernet interface supported by this line card
by changing its SFP module.
Use these guidelines for installing SFP modules:
• There is no correlation of the type of latch to the model (such as SX or LH) or technology type (such
as Gigabit Ethernet) of SFP modules. Always read the label on the SFP module to determine the
technology type and model.
• You can install and remove SFP modules with power on to the system.
• Disconnect all cables before removing or installing an SFP module. We strongly recommend that
you do not install or remove the SFP module with optical fiber cables attached to it.
• SFP modules are keyed to prevent incorrect insertion.