The small form-factor pluggable (SFP) is a compact, compatible and hot-swappable transceiver module, which is widely utilized in telecommunications and data communications. There are a lot of SFP transceivers available for short or long distance transmission. They are designed to transmit data at different Ethernet transmission rate, such as 10G, 40G and 100G. This article mainly describes 10BASE SFPs for Gigabit Ethernet transmission..

10 Gigabit Ethernet (10GE, 10GbE, or 10 GigE) is a group of computer networking technologies for transmitting Ethernet frames at a rate of 10 gigabits per second (10×109 or 10 billion bits per second). It was first defined by the IEEE 802.3ae-2002 standard. Over the years, the Institute of Electrical and Electronics Engineers (IEEE) 802.3 working group has published several standards relating to 10GbE. These included: 802.3ae-2002 (fiber -SR, -LR, -ER and -LX4 PMDs), 802.3ak-2004 (-CX4 copper twin-ax InfiniBand type cable), 802.3an-2006 (10GBASE-T copper twisted pair), 802.3ap-2007 (copper backplane -KR and -KX4 PMDs) and 802.3aq-2006 (fiber -LRM PMD with enhanced equalization). The 802.3ae-2002 and 802.3ak-2004 amendments were consolidated into the IEEE 802.3-2005 standard. IEEE 802.3-2005 and the other amendments were consolidated into IEEE Std 802.3-2008. There are many specifications under those above-mentioned standards related to 10GbE displayed by the following table.

The following passages aim at introducing three specifications of 10G SFPs: 10GBASE-SR, 10GBASE-LR and 10GBASE-LRM.

10GBASE-SR (short range) is a port type for multi-mode fibers and uses 850nm lasers. Its Physical Coding Sublayer 64b/66b PCS is defined in IEEE 802.3 Clause 49 and its Physical Medium Dependent (PMD) in Clause 52. It delivers serialized data at a line rate of 10.3125 Gbit/s. The Cisco SFP-10G-SR supports a link length of 26 m on standard Fiber Distributed Data Interface (FDDI)-grade multi-mode fiber (MMF). Using 2000MHz*km MMF (OM3), up to 300m link lengths is possible. Using 4700MHz*km MMF (OM4), up to 400m link lengths is possible. The following picture is a 10G-SFP-SR.

10GBASE-LR (long reach) is a port type for single-mode fibers and uses 1310nm lasers. Its Physical Coding Sublayer 64b/66b PCS is defined in IEEE 802.3 Clause 49 and its Physical Medium Dependent PMD in Clause 52. It delivers serialized data at a line rate of 10.3125 Gbit/s. The Cisco 10GBASE-LR module supports a link length of 10 kilometers on standard single-mode fiber (SMF, G.652).

10GBASE-LRM (long reach multi-mode) originally specified in IEEE 802.3aq is a port type for multi-mode fibers and uses 1310nm lasers. Its Physical Coding Sublayer 64b/66b PCS is defined in IEEE 802.3 Clause 49 and its Physical Medium Dependent PMD in Clause 68. It delivers serialized data at a line rate of 10.3125 Gbit/s.

In a word, 10BASE-SR, 10BASE-LR, 10BASE-LRM are all suitable optical modules for Gigabit Ethernet. Fiber types and transmission distance decide which kind or kinds of 10G SFPs are used. Fiberstore offers various compatible SFPs for transmission. 10G-SFP-SR, 10G-SFP-LR, 10G-SFP-LRM, 10G-SFP-ER, 10G-SFP-ZR are all available in Fiberstore, whose SFP-10G-SR list price is competitive. It is really cost-effective to buy SFP-10G-SR in Fiberstore. For more information about 10G SFPs, please visit Fiberstore.

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