Fiber Optic Interfaces of Cisco SFP TransceiversCisco's small form-factor pluggable (SFP) transceivers are the hot-swappable input/output devices plug into aGigabit Ethernet port or slot. Optical and copper models can be used on a wide variety of Cisco products andintermixed in combinations of 1000BASE-T, 1000BASE-SX, 1000BASE-LX/LH, 1000BASE-EX, 1000BASE-ZX,or 1000BASE-BX10-D/U on a port-by-port basis. We can easily judge the Gigabit Ethernet port type only by thedescription or model name of the SFP modules. However, when choosing or using the SFP transceivers, we areusually confused with the fiber optic interfaces of Cisco SFP transceivers. Today, we are going to have anoverview of the fiber optic interface of Cisco commomly used SFPs.

The Product Family of Cisco SFPs

The product family of Cisco SFP transceivers includes the following types:

1000BASE-T SFP for Copper Networks1000BASE-SX SFP for Multimode Fiber Only1000BASE-LX/LH SFP for Both Multimode and Single-Mode Fibers1000BASE-EX SFP for Long-Reach Single-Mode Fibers1000BASE-ZX SFP for Long-Reach Single-Mode Fibers1000BASE-BX10-D and 1000BASE-BX10-U SFP for Single-Fiber Bidirectional Applications

Fiber Optic Interfaces of Cisco SFP Transceivers

According to the product family of Cisco SFPs, each type has its own featuredproducts. The optical interface and the corresponding fiber patch cable type of eachproduct are mentioned in the following:

1000BASE-T SFP

[GLC-T=] Category 5 copper wire, RJ-45 connector[SFP-GE-T=] Category 5 copper wire, extended operating temperature range, RJ-45 connector

1000BASE-SX SFP

[GLC-SX-MM=] MMF, 850-nm wavelength, dual LC/PC connector[SFP-GE-S=] MMF, 850-nm wavelength, extended operating temperature range and DOM support, dualLC/PC connector[GLC-SX-MM-RGD] MMF, 850-nm wavelength, industrial Ethernet, dual LC/PC connector[GLC-SX-MMD=] MMF, 850-nm wavelength, extended operating temperature range and DOM support,dual LC/PC connector

1000BASE-LX/LH SFP

[GLC-LH-SM=] MMF and SMF, 1300-nm wavelength, dual LC/PC connector[SFP-GE-L=] MMF and SMF, 1300-nm wavelength, extended operating temperature range and DOMsupport, dual LC/PC connector[GLC-LX-SM-RGD] MMF and SMF, 1300-nm wavelength, industrial Ethernet, dual LC/PC connector[GLC-LH-SMD=] MMF and SMF, 1300-nm wavelength, extended operating temperature range and DOMsupport, dual LC/PC connector

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1000BASE-ZX SFP

[GLC-ZX-SM=] SMF, 1550-nm wavelength, dual LC/PC connector[SFP-GE-Z=] SMF, 1550-nm wavelength, extended operating temperature range and DOM support, dualLC/PC connector[GLC-ZX-SM-RGD] SMF, 1550-nm wavelength, industrial Ethernet, dual LC/PC connector[GLC-ZX-SMD=] SMF, 1550-nm wavelength, dual LC/PC connector

1000BASE-BX10 SFP / Dual-channel 1000BASE-BX10 SFP

[GLC-BX-D=] single-strand SMF, 1490-nm TX/1310-nm RX wavelength, single LC/PC connector[GLC-BX-U=] single-strand SMF, 1310-nm TX/1490-nm RX wavelength, single LC/PC connector[GLC-2BX-D=] single-strand SMF, 1490-nm TX/1310-nm RX wavelength, two single LC/PC connectors

1000BASE-EX SFP

[GLC-EX-SMD=] SMF, 1310-nm wavelength, extended operating temperature range and DOM support,dual LC/PC connector

Some Tips on The Model of Cisco SFP Transceivers

When using or choosing Cisco SFPs, the meaning of the product's model(eg. the meaning of the letters and numbers) needs to be known. Here aresome tips on them.

SX - 850 nm, for a maximum of 550 m at 1.25 Gbit/s (gigabitEthernet) or 150m at 4.25 Gbit/s (Fibre Channel) for single-modefiber.LX - 1310 nm, for distances up to 10 km.EX - 1310 nm, for distances up to 40 km.ZX - 1550 nm, for distances up to 80 km.BX - 1490 nm/1310 nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as BS-U and BS-Dfor Uplink and Downlink respectively, also for distances up to 10 km. Variations of bidirectional SFPs arealso manufactured which use 1550 nm in one direction.T - stands for port of BaseT port, they are not compatible with (or rather: do not have equivalents for) Fibrechannel or SONET."D" in "GLC-SX-MMD" - Digital Optical Monitoring (DOM) support, performing transceiver monitoringand troubleshooting operations."RGD" in GLC-SX-MM-RGD - Rugged' (RGD) Transceiver Module, which features enhanced ESDprotection, and extended operating temperature range."=" in GLC-SX-MM= - Field Replaceable Units which can be used as "spare" or be shipped individually toreplace damaged units. The new parts that are ordered directly from a reseller or from Cisco usually don'tcome with the = sign.

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