Cisco Systems OL-7861-01 manual GLC-LX-SM-Single-mode, long-reach

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

		Power	Transmit	Receive	Receive	Typical Maximum
SFP	Transceiver	Budget	Power	Power	Sensitivity	Distance
GLC-SX-MM	Short wavelength	7.5 dB	1	–17 to 0 dBm	–17 dBm	984 feet (300 meters)
			–9.5 to -4 dBm
	Multimode,		at 850 nm2
	short haul
GLC-LH-SM3	Long wavelength	8.0 dB	–9.5 to –3 dBm	–19 to -3 dBm		32,808 feet (10,000 meters)
	Single-mode,		at 1310 nm
	long haul
GLC-LX-SM4	Single-mode,	8 dB	–11 to –3 dBm	–19 to –3 dBm	–19 dBm
	long-reach		at 1310 nm
GLC-ZX-SM5	Single-mode,	23 dB	0 to +5 dBm	–23 to 0 dBm	–23 dBm
	extended-reach		at 1550 nm

1.dBm = decibels referenced to 1 milliwatt

2.nm = nanometer

3.Not valid for 4-Port Gigabit Ethernet ISE line card

4.4-Port Gigabit Ethernet ISE line card only

5.4-Port Gigabit Ethernet ISE line card only

Table 14 Gigabit Ethernet Laser Optical Transceiver (SFP) Module Operating Parameters

SFP Module	Type	Wavelength	Cable	Distance
GLC-SX-MM	Short wavelength	850 nm	MMF 62.5/125 micron	722 feet (220 m)
	(multimode short haul)
			MMF 50/125 micron	1640 feet (500 m)
GLC-LH-SM	Long wavelength	1310 nm	SMF 9/125 micron	32,808 feet (10,000 m)
	(single-mode long
	haul)

Cisco XR 12000 Series Router Ethernet Line Card Installation

48 OL-7861-01