1000BASE-SX SFP Transceivers for Gigabit Ethernet

Standardized by the IEEE, Gigabit Ethernet is a term describing various technologies for transmitting Ethernet frames at a rate of a Gigabit per second, which has been considered to be a viable solution for increased bandwidth requirements for growing networks. 1000BASE SFP transceiver is a hot-pluggable input/output device that plugs into a Gigabit Ethernet port/slot, linking the port with the network. Recently the market is flooded with various 1000BASE SFP transceivers available for Gigabit Ethernet. With so many options out there in the market, people may feel puzzled about how to select the one that is in in accordance with their application. Therefore the following article will make a brief introduction to the 1000BASE SFP to help you choose the most suitable one.

Fiber-based or Copper-based Gigabit Ethernet

According to cable material, Gigabit Ethernet can be classified into fiber-based Gigabit Ethernet and copper-based Gigabit Ethernet. In fiber-based Gigabit Ethernet, 1000BASE-X is used to refer to Gigabit Ethernet transmission over fiber. 1000BASE-X is a group of standards for Ethernet physical layer standards. These standards include: 1000BASE-SX (A fiber optic Gigabit Ethernet standard for operation over multi-mode fiber), 1000BASE-LX (a fiber optic Gigabit Ethernet standard using a long wavelength laser and a maximum RMS spectral width of 4 nm), 1000BASE-LX10 (which is very similar to 1000BASE-LX, but achieves longer distances over a pair of single-mode fiber), 1000BASE-BX10 (which is capable of up to 10 km over a single strand of single-mode fiber) or the non-standard 1000BASE-EX ( a industry accepted term to refer to Gigabit Ethernet transmission) and 1000BASE-ZX (a multi-vendor term to refer to Gigabit Ethernet transmission) implementations.

While for copper-based Gigabit Ethernet, 1000BASE-CX, 1000BASE-KX, 1000BASE-T and 1000BASE-TX are four standards for Gigabit Ethernet over copper wiring. 1000BASE-CX uses copper cables as a medium. 1000BASE-KX is part of the IEEE 802.3ap standard for Ethernet Operation over Electrical Backplanes. 1000Base-T uses four pairs of Category 5 unshielded twisted pair cables to achieve Gigabit data rates. 1000BASE-TX is similar to 1000BASE-T but uses two pairs of wires rather than four for data transmission.

1000BASE SFP Transceivers for Gigabit Ethernet

1000BASE SFP transceiver is a device that interfaces a network device motherboard to a fiber optic or copper networking cable. It is designed to support Gigabit Ethernet, Fibre Channel and other communications standards. As noted before, there are 1000BASE optical SFP transceivers and 1000BASE copper SFP transceivers used in Gigabit Ethernet. The following part will go on to talk about one of the 1000BASE optical SFP transceivers—1000BASE-SX SFP.

The 1000BASE-SX is one of the physical layer standards for Gigabit Ethernet, meaning the single optic fiber 1000Mbps baseband transmission standard. “S” refers to short-range multimode optical cable, while “X” means 4B/5B block coding for Fast Ethernet or 8B/10B block coding for Gigabit Ethernet. The standard specifies a transmission distance between 220 m and 550 m. It is highly popular for intra-building links in large office buildings, co-location facilities and carrier neutral internet exchanges. Therefore, 1000BASE-SX SFP transceiver module is the best seller in those fields.

Two 1000BASE-SX SFP Transceivers

The 1000BASE-SX SFP transceiver module is compatible with the 1000BASE-SX standard. It can support up to 1km over laser-optimized 50μm multimode fiber cable. The wavelength range that 1000BASE-SX SFP transceiver module transmits and receives is from 770nm to 860nm. Fiberstore provides a variety of 1000BASE-SX SFP transceivers that are fully compatible with other brands. Take AA1419048-E6 and TL-SM311LM as an example.

AA1419048-E6AA1419048-E6 is Avaya Nortel 1000BASE-SX SFP transceiver module for multimode fiber. It is the multimode module with a wavelength of 850nm. Avaya Nortel 1000BASE-SX SFP transceiver module supports hot-pluggable SFP footprint duplex LC connector Interface. This transceiver is built to comply with Multi-Source Agreement (MSA) standards. AA1419048-E6 supports dual data-rate of 1.25Gbps/1.0625Gbps, which is widely used in fiber channel links, Gigabit Ethernet links, Fast Ethernet links, other optical links.

TL-SM311LMBesides AA1419048-E6, TL-SM311LM from TP-LINK is also available in the market for supporting Gigabit Ethernet Application. TL-SM311LM has the same specification with other 1000BASE-SX SFPs, which supports a link length of up to 550m on multimode fiber.

As there are different physical layer standards for Gigabit Ethernet, different 1000BASE SFP transceivers may be used for different application. These 1000BASE SFP transceivers can be used for single-mode and multimode fibers of different reaches. 1000BASE-SX SFP transceiver can operate link spans of up to 550m on any multimode fibers. Fiberstore produces a variety of compatible 1000BASE SFP with high quality and low prize including the above two SFP transceivers. We can also customize optic transceiver to meet your specific requirements. If you have any interest, please send your request to us.

The Basics of 1000BASE-SX and 1000BASE-LX SFP

Gigabit Ethernet has been regarded as a huge breakthrough of telecom industry by offering speeds of up to 100Mbps. Gigabit Ethernet is a standard for transmitting Ethernet frames at a rate of a gigabit per second. There are five physical layer standards for Gigabit Ethernet using optical fiber (1000BASE-X), twisted pair cable (1000BASE-T), or shielded balanced copper cable (1000BASE-CX). 1000BASE-LX and 1000BASE-SX SFP are two common types of optical transceiver modules in the market. Today’s topic will be a brief introduction to 1000BASE-LX and 1000BASE-SX SFP transceivers.

1000BASE in these terms refers to a Gigabit Ethernet connection that uses the unfiltered cable for transmission. “X” means 4B/5B block coding for Fast Ethernet or 8B/10B block coding for Gigabit Ethernet. “L” means long-range single- or multi-mode optical cable (100 m to 10 km). “S” means short-range multi-mode optical cable (less than 100 m).

1000BASE-SX
1000BASE-SX is a fiber optic Gigabit Ethernet standard for operation over multi-mode fiber using a 770 to 860 nanometer, near infrared (NIR) light wavelength. The standard specifies a distance capability between 220 meters and 550 meters. In practice, with good quality fiber, optics, and terminations, 1000BASE-SX will usually work over significantly longer distances. This standard is highly popular for intra-building links in large office buildings, co-location facilities and carrier neutral internet exchanges. 1000BASE-SX SFP works at 850nm wavelength and used only for the purposed of the multimode optical fiber with an LC connector. 1000BASE-SX SFP traditional 50 microns of multimode optical fiber link is 550 meters high and 62.5 micron fiber distributed data interface (FDDI) multimode optical fiber is up to 220 meters. Take EX-SFP-1GE-SX as an example, its maximum distance is 550m with DOM support. The 1000Base-SX standard supports the multimode fiber distances shown in table 1.

1000BASE-LX
Specified in IEEE 802.3 Clause 38, 1000BASE-LX is a type of standard for implementing Gigabit Ethernet networks. The "LX" in 1000BASE-LX stands for long wavelength, indicating that this version of Gigabit Ethernet is intended for use with long-wavelength transmissions (1270–1355 nm) over long cable runs of fiber optic cabling. 1000BASE-LX can run over both single mode fiber and multimode fiber with a distance of up to 5 km and 550 m, respectively. For link distances greater than 300 m, the use of a special launch conditioning patch cord may be required. 1000BASE-LX is intended mainly for connecting high-speed hubs, Ethernet switches, and routers together in different wiring closets or buildings using long cabling runs, and developed to support longer-length multimode building fiber backbones and single-mode campus backbones. E1MG-LX-OM is Brocade 1000BASE-LX SFP that operates over a wavelength of 1310nm for 10 km.

Difference Between LX, LH and LX/LH
Many vendors use both LH and LX/LH for certain SFP modules, this SFP type is similar with the other SFPs in basic working principle and size. However, LH and LX/LH aren’t a Gigabit Ethernet standard and are compatible with 1000BASE-LX standard. 1000BASE-LH SFP operates a distance up to 70km over single-mode fiber. For example, Cisco MGBLH1 1000BASE-LH SFP covers a link length of 40km that make itself perfect for long-reach application. 1000BASE-LX/LH SFP can operate on standard single-mode fiber-optic link spans of up to 10 km and up to 550 m on any multimode fibers. In addition, when used over legacy multimode fiber type, the transmitter should be coupled through a mode conditioning patch cable.

Conclusion
1000BASE SFP transceiver is the most commonly used component for Gigabit Ethernet application. With so many types available in the market, careful notice should be given to the range of differences, both in distance and price of multimode and single-mode fiber optics. Fiberstore offers a large amount of in-stock 1000BASE SFP transceivers which are compatible for Cisco, Juniper, Dell, Finisar, Brocade, or Netgear in various options. If you have any requirement of our products, please send your request to us.

1000BASE-T – Gigabit Over Copper Cabling

With the massive applications of bandwidth-related products in telecommunication networks, people may encounter a dilemma of whether to deploy fiber-based or copper-based infrastructure. Limited budget always comes as an essential factor deciding people’s choice, under this circumstance, copper cabling or 1000BASE-T proves to be a nice and cost-saving method.

What Does 1000BASE-T Mean?
1000Base-T is a shorthand designation by the Institute of Electrical and Electronics Engineers (IEEE). The 1,000 refers to the transmission speed of 1,000 Mbps, while “base” refers to baseband signaling, which means that only Ethernet signals are being carried on this medium. The “T” refers to the twisted pair cables this technology uses. The following image shows a compatible Finisar FCLF8521P2BTL.

1000Base-T is a type of gigabit Ethernet networking technology that uses copper cables as a medium. 1000Base-T uses four pairs of Category 5 unshielded twisted pair cables to achieve gigabit data rates. The standard is designated as IEEE 802.3ab and allows 1 Gbps data transfer for distances of up to 330 feet.

Comparison Between 100BASE-TX, 1000BASE-X, and 1000BASE-T
1000BASE-T is one of the four physical layers or transceivers defined by the two Gigabit Ethernet standards: IEEE 802.3z or 1000BASE-X and IEEE 802.3ab or 1000BASE-T. The following text will describe the comparison between 100BASE-TX, 1000BASE-X, and 1000BASE-T in details. Firstly, let us see the table below.

1000BASE-X supports multi-mode and single-mode fiber media and a short-reach, 25-meter copper jumper. As most of the cabling installed inside buildings today is Category 5 copper, the IEEE 802.3 1000BASE-T standard supports Gigabit Ethernet operation over the Category 5 cabling systems installed according to the specifications of ANSI/TIA/EIA-568A (1995). 1000BASE-T, however, works by using all four of the Category 5 pairs to achieve 1000 Mbps operation over the installed Category 5 copper cabling. 1000 Mbps data rates are achieved by sending and receiving a 250 Mbps data stream over each of the four pairs simultaneously.

In contrast, 100BASE-TX uses two pairs: one to transmit and one to receive. Fast Ethernet on Copper (100BASE-TX) achieves 100 Mbps operation by sending encoded symbols across the link at a symbol rate of 125 Mbaud. A 125 Mbaud symbol rate is required because the 100BASE-TX encoding scheme (called 4B/5B coding) has a bandwidth overhead of 20 percent, the difference between 100 Mbps and 125 Mbaud. Although 1000BASE-T uses a different encoding scheme (five level pulse amplitude modulation or PAM-5), because it maintains the 125 Mbaud symbol rate of 100BASE-TX, 1000BASE-T is backwards compatible with 100BASE-FX at the physical layer.

This compatibility feature is significant for network managers and planners because it means that forthcoming generations of 1000BASE-T NICs and switches will support both 100/1000 and 10/100/1000 autonegotiation between Fast Ethernet (100BASE-TX) and Gigabit Ethernet (1000BASE-T). These speed-agile products will enable network managers to deploy 1000BASE-T incrementally into the network.

Fiberstore Compatible 1000BASE-T Transceiver
1000BASE-T is a time-saving and cost-effective solution. Various products have been provided to enhance the 1000BASE-T performances. Fiberstore provides a wide range of 1000BASE-T transceiver modules including FCLF8521P2BTL, AA1419043-E6 and SFP-1GE-FE-E-T. Please feel free to contact us for more information about 1000BASE-T transceivers.

Reference:
http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/gigabit-ethernet-gbic-sfp-modules/product_data_sheet0900aecd8033f885.html