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Cisco XR 12000 Series Router Ethernet Line Card Installation
OL-7861-01
Cabling and Specifications
The following SFP module options are available for a Gigabit Ethernet line card:
• GLC-SX-MM—Short wavelength SFP module (850 nm nominal), for use in 1000BASE-SX links.
• GLC-LH-SM—Long-haul or long-wavelength SFP module (1310 nm nominal), for use in
1000BASE-LX links.
• GLC-LX-SM—Single-mode, long-reach
• GLC-ZX-SM=—Single-mode, extended-reach (supported by 4-Port Gigabit Ethernet ISE line card
only)
The SFP modules have LC connectors. Different SFP module options allow you to customize the
physical interfaces on the line card by using both types of modules on the same line card. 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 and multimode. 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.
Table 13 describes the operating parameters for the supported SFP modules.
Table 13 Gigabit Ethernet SFP Module Power Budget and Signal Requirements
SFP Transceiver
Power
Budget
Transmit
Power
Receive
Power
Receive
Sensitivity
Typical Maximum
Distance
GLC-SX-MM Short wavelength
Multimode,
short haul
7.5 dB –9.5 to -4 dBm
1
at 850 nm
2
1. dBm = decibels referenced to 1 milliwatt
2. nm = nanometer
–17 to 0 dBm –17 dBm 984 feet (300 meters)
GLC-LH-SM
3
3. Not valid for 4-Port Gigabit Ethernet ISE line card
Long wavelength
Single-mode,
long haul
8.0 dB –9.5 to –3 dBm
at 1310 nm
–19 to -3 dBm 32,808 feet (10,000 meters)
GLC-LX-SM
4
4. 4-Port Gigabit Ethernet ISE line card only
Single-mode,
long-reach
8 dB –11 to –3 dBm
at 1310 nm
–19 to –3 dBm –19 dBm
GLC-ZX-SM
5
5. 4-Port Gigabit Ethernet ISE line card only
Single-mode,
extended-reach
23 dB 0 to +5 dBm
at 1550 nm
–23 to 0 dBm –23 dBm
Table 14 Gigabit Ethernet Laser Optical Transceiver (SFP) Module Operating Parameters
SFP Module Type Wavelength Cable Distance
GLC-SX-MM Short wavelength
(multimode short haul)
850 nm MMF 62.5/125 micron 722 feet (220 m)
MMF 50/125 micron 1640 feet (500 m)
GLC-LH-SM Long wavelength
(single-mode long
haul)
1310 nm SMF 9/125 micron 32,808 feet (10,000 m)