In computer networks, 10 Gigabit Ethernet refers to various technologies for transmitting Ethernet frames at a rate of 10 gigabits per second (10×109 or 10 billion bits per second), first defined by the IEEE 802.3ae-2002 standard. 10-Gigabit Connections For 10-Gigabit Ethernet cabling the fiber options are very similar. The transceivers are somewhat different, as is some nomenclature. New possibilities have evolved for copper connections.

Transceivers
Standards bodies initially offered several options for the 10-Gigabit transceiver. 10G transceivers series include QSFP+ Transceiver, XFP Transceiver, SFP+ Transceiver, XENPAK Transceiver Transceiver and X2 Transceiver. The one that ultimately evolved as most popular in commercial data center usage was the SFP+ transceiver. The Cisco 10GBASE SFP+ modules offer customers a wide variety of 10 Gigabit Ethernet connectivity options for data center, enterprise wiring closet, and service provider transport applications.

Cisco SFP-10G-SR
The Cisco 10GBASE-SR Module supports a link length of 26m on standard Fiber Distributed Data Interface (FDDI)-grade multimode fiber (MMF). It is 10GBase SR compliant and work at 850nm, this transceiver is in standards SFP+ package to plug into the ports or slots on Cisco equipment, optical interface is duplex LC connector. Using 2000MHz*km MMF (OM3), up to 300m link lengths are possible. Using 4700MHz*km MMF (OM4), up to 400m link lengths are possible.

Cisco SFP-10G-SR-X
The Cisco SFP-10G-SR-X is a 10GBASE-SR module for extended operating temperature range. It supports a link length of 26m on standard Fiber Distributed Data Interface (FDDI)-grade multimode fiber (MMF). Using 2000MHz*km MMF (OM3), up to 300m link lengths are possible. Using 4700MHz*km MMF (OM4), up to 400m link lengths are possible.

Cisco SFP-10G-LRM
The Cisco 10GBASE-LRM Module supports link lengths of 220m on standard Fiber Distributed Data Interface (FDDI) grade multimode fiber (MMF). To ensure that specifications are met over FDDI-grade, OM1 and OM2 fibers, the transmitter should be coupled through a mode conditioning patch cord. No mode conditioning patch cord is required for applications over OM3 or OM4. The Cisco 10GBASE-LRM Module also supports link lengths of 300m on standard single-mode fiber (SMF, G.652).

Cisco FET-10G
The Cisco FET-10G Fabric Extender Transceiver support link lengths up to 100m on laser-optimized OM3 or OM4 multimode fiber. It is supported on fabric links only from a Nexus 2000 to a Cisco parent switch.

Cisco SFP-10G-LR
The Cisco 10GBASE-LR Module is single mode, supports a link length of 10 kilometers on standard single-mode fiber (SMF, G.652).

Cisco SFP-10G-LR-X
The Cisco SFP-10G-LR-X is a multirate 10GBASE-LR, 10GBASE-LW and OTU2/OTU2e module for extended operating temperature range. It supports a link length of 10 kilometers on standard single-mode fiber (SMF, G.652).

Cisco SFP-10G-ER
The Cisco 10GBASE-ER Module supports a link length of up to 40 kilometers on standard single-mode fiber (SMF, G.652).

Cisco SFP-10G-ZR
The Cisco SFP-10G-ZR is a multirate 10GBASE-ZR, 10GBASE-ZW and OTU2/OTU2e module. It supports link lengths of up to about 80 kilometers on standard single-mode fiber (SMF, G.652). This interface is not specified as part of the 10 Gigabit Ethernet standard and is instead built according to Cisco specifications.

10GbE supports both copper and fiber cabling. However, due to its higher bandwidth requirements, higher-grade copper cables are required: category 6A or Class F/Cat 7 Ethernet cables for links up to 100m. Unlike previous Ethernet standards, 10 gigabit Ethernet defines only full duplex point-to-point links which are generally connected by network switches. Half duplex operation and hubs do not exist in 10GbE.

If protection of equipment or people is a design requirement, consider low-smoke zero-halogen (LSZH) jacketed cables. They emit fewer toxic fumes than standard PVC-based cable jackets. Typically, halogen free cable is used in confined spaces such as mining operations where ventilation is of concern.

What is the difference between LSZH cable and common cables?

The function and technique parameter of LSZH fiber optic cable is just like common fiber optic cables, and inner structure is also similar, the basic difference is the jackets. LSZH fiber optic jackets is more fire-resistant compared with common PVC jacketed cables, even when they are caught in fire, the burned LSZH cables provide low smoke and no halogen substances, this feature is not only environment protective but the low smoke when it got burned is also important to people and facilities in the fired place.

LSZH jacket is made up of some very special materials which are non-halogenated and flame retardant. LSZH cable jacketing is composed of thermoplastic or thermoset compounds that emit limited smoke and no halogen when exposed to high sources of heat. LSZH cable reduces the amount of harmful toxic and corrosive gas emitted during combustion. This type of material is typically used in poorly ventilated areas such as aircraft or rail cars. LSZH jackets are also safer than Plenum-rated cable jackets which have low flammability but still release toxic and caustic fumes when they are burned.

Low smoke zero halogen is becoming very popular and, in some cases, a requirement where the protection of people and equipment from toxic and corrosive gas is critical. This type of cable is ever involved in a fire very little smoke is produced making this cable an excellent choice for confined places such as ships, submarines, aircraft, high-end server rooms and network centers.

Every coin has two sides. Since LSZH cables have so many benefits listed above, what are the Cons of the cable?

1. LSZH is more susceptible to jacket cracking. Special lubricants have been made to minimize damage during installation.

2. LSZH jacket has a high filler content, around 50% to provide the required flame and smoke performance. This results in a lower mechanical, chemical resistance, water absorption and electrical properties then non LSZH compounds.

3. The current generation of LSZH cables has not yet established a proven history of long time performance.

The LSZH cables are available with 1, 2, 12, 24 fibers, and variable sub-cable dimensions that support specific termination and routing requirements. They are suitable for halogen free and many international installations. LSZH cable contains no flooding gel and is OFNR Riser rated, is perfect for installation in conduits between buildings and run directly thru risers to a convenient network or dome fiber optic splice closure without a separate point of splice at building entrance.

There are also LSZH fiber optic patch cords available. Both LSZH fiber optic cables and LSZH fiber optic patch cords are required for the Rosh compliant cable assemblies, but Rosh standard is more strict besides it require the cables to be LSZH type. LSZH fiber patch cords are used widely used in the places where expensive equipment would be damaged if exposed to corrosive gases, and they are also used in crowded areas like commercial centers and sports centers.

Mature plug-in package transeivers like 10Gbps XFP module continue to evolve. Transmode in its system integrated XFP-based tunable lasers, called tunable XFP which has important advantages. Opposite to the Menara Networks, integrated the system function to XFP commonly only for line card.

XFP With New Uses

Until now, the deployment of fixed wavelength DWDM XFP means that the system supplier must possess considerable amount of inventory to prepare for operators to deploy new DWDM wavelengths needed.

If there is no inventory, system vendors must order transceivers to the supplier only after waiting for customers to confirm the wavelength, which implies the delivery period of 12-18 weeks. While the use of tunable XFP, just a transceiver can meet the wavelength planning requirements for all operators.

In addition, the optical property of XFP is only slightly after 10 Gbps 300-pin SFF MSA, which only has “2-3dB optical signal-to-noise ratio advantage, means the need for a longer rate to make signal through more optical amplifiers”. Increasing the total achievable rate using the 300 pin packages are available in the 1000km without the use of repeaters.

MSA power and space specifications (such as XFP) are important for component supplier?

It appears important only in a demand. For example, the maximum rated power of XFP is 3.5W, if you use a tunable XFP, a thermoelectric cooler is occupied 1.5-2W, lasers occupy 0.5W, TIA occupied a part, then left to the modulator driver there is not much left.

At the same time, Menara Networks has implemented the optical transmission network (OTN) of ITU-T in the XFP application in the form of specific integrated circuit (ASIC). OTN used in adding optical performance monitoring function and transmitting error correction, at the same time, for signal transmission package. Through the integration of OTN in the plug-in package, package, the functions of signal package, achievable rate and optical signal management can be added to the IP routers and carrier Ethernet switch routers. This design has several advantages: the elimination of the needs of using additional 10 Gbps transponder to transmit switch or router signal (for DWDM transmission), and allows system suppliers to develop universal card without support OTN. But the biggest technical problem for Menara is the development of the included software rather than the development of OTN ASIC.

Plug-in type and Optical Engine

CFP is applicable to the data center, but the high density applications such as link switch and high performance computing require a more compact design, such as QSFP, CXP and the so-called optical engine.

QSFP is favored interface by the active cable, also is one of the alternative options for copper interconnects. The QSFP transceiver support Quad Data Rate (QDR) 4xInfiniband, can extend the copper cable 4×10 Gbps Ethernet achievable rate of outside 7m. It is also one of the options for more compact 40 GbE short distance interface.

Achieving 100 GbE in QSFP is also a problem, because how to meet the QSFP power limits while adding a 25 Gbps / channel interface and a number of high-speed lasers is quite a headache problem, may need a intermediate package of level definition.

While CXP is a front panel interface can realize more intensive interface in the data center, is particularly useful for the links between chassis. According to Avago Technologies, the Infiniband is the first target market for CXP, but before CXP transceiver applied in the 100 GbE Ethernet there are several technical problems need to solve, for example, to meet the requirements of IEEE optical specifications.

For optical engine, for example, SNAP12 parallel optical module can be used to connect a plurality of platforms of large-scale IP router configurations, as well as for high-end computing. However, this module is not a plug-in package, is composed of 12 independent channel transmitter and receiver modules, with 6.25 Gbps / channel data rate.

CXP and SNAP12 own self-advantages, such as SNAP12 located on the motherboard and its small package makes it possible to set up next to the ASIC. For those who use optical engine to reduce the cost of parallel interface and meet the requirement of high-speed interface between the motherboard, frame and system, this kind of method just fits its meaning.

100 GbE as well as the arrival of more high-speed era, plus 25 Gbps electric interface will further promote the development of optical engine. But in the standard FR4 printed circuit board to route 10 Gbps is very difficult, and longer link (up to 10 inches) need to use pre-emphasis, electronic dispersion compensation and retiming techniques.

Fiber optical transceiver module may be deal with the surge network traffic, but the functions like link platforms, panels and board equipments are the play space where fiber optical transceiver supplier can achieve product differentiation.

Fiber optic technology has revolutionized the way the communication can be handled in a more efficient and faster manner. Fiber Pigtail is a piece of optical cable with connectors only on one side of the cable and a length of exposed fiber at the other end. It is as simple as that. Due to its small size, it can fit for being put inside the fiber optic patch panel boxes or fiber optic splicing enclosures.

Fiber pigtails types are dependent on the connector types and the fiber optic cable. Usually the fiber optic pigtail is with 0.9mm outer diameter cable. Pigtails are usually used inside the fiber optic management equipment, the connectors on the pigtail can link to the adapter or other devices, the other end of the pigtail which does not contain the connectors, is stripped back and fusion spliced to another single fiber, by melting together the fiber glasses, it can reach a minimum insertion loss. This is done easy in field with a multi-fiber trunk to break out the multi-fiber cable into its component for connection to the end equipment.

There are pigtail single mode and pigtail multimode, which can be with various types of fiber optic terminations such as SC, FC, ST, LC, MU, MT-RJ, MTP, MPO, etc. Pigtails can have female or male connectors. Female connectors could be mounted in a patch panel, often in pairs although single-fiber solutions exist, to allow them to be connected to endpoints or other fiber runs with patch fibers. Alternatively they can have male connectors and plug directly into an optical transceiver.

Fiber optic pigtail Specifications:
Types: single mode, multimode;
Terminations: FC, SC, ST, MU, LC, D4, DIN, E2000, MT-RJ, MPO, SMA, E2000, FDDI, and ESCON;
Insertion Loss (dB): less than 0.2 (PC and UPC);
Exchangeability: less than 0.2 dB;
Tensile Strength: less than 0.2 dB (0 to15 kgf);
Temp. Range: (- 40 to +80 degree centigrade).

What is the difference between the fiber optic connector, fiber patch cable and pigtail?
Fiber optic connector is used for connecting fiber. Fiber optic patch cords used to do the patch cord from the equipment to the fiber optic cabling link. Pigtail is welding and connecting to other fiber optic cable core, often appear in the fiber optic terminal box, used to connect fiber optic cable and fiber optic transceivers (also used in the coupler, fiber optic patch cords, etc.).

FiberStore offers the single-mode 9/125, multimode 10Gb 50/125, multimode 62.5/125 and multimode 50/125 types fiber optic pigtails. They are with various SC, FC, ST, LC, MU, MT-RJ, MTP, MPO, PC, UPC, and APC connectors respectively. These fiber pigtails are available in simplex or duplex versions, custom design also available.

Infinera, the owner and operator of a national selection of the Infinera DTN-X platform for its national wide network. With the features of 500 Gigabit per second (Gb/s) long haul super-channels, the Infinera DTN0-X platform is able to build a new network infrastructure which delivers 10, 40 and 100 Gigabit Ethernet (GbE) services to service providers and research and education networks.

FX Network, which is already operating a national inter-city optical transport network, has partnered with REANZ. New Zeanland's Research and Education Network, to build this new multi-terabit infrastructure. The agreement between the two parties includes joint investment and fiber sharing and should improve the ability of researchers and scientists across New Zealand to participate in data-intensive experiments, both with New Zealand and around the world.

The high capacity network also will benefit the existing and future business and ISP customers of FX Network via the availability of the 10GbE, 40GbE, and 100GbE services the network will support. Indiana says the DTN-X's super-channel capabilities, supported via its 500-Gbps photogenic integrated circuits (PICs), and intelligent software control will provide both high capacity and rapid service turn up.

"We are seeing burgeoning demand for high speed data services in New Zealand, impacted by the growing trend towards the use of cloud-based services and an insatiable demand for content from customers of the ISP's that rely on our backhaul services, " said David Heald, CEO at FX Network. "We expect this to continue and accelerate with the ongoing deployment f Ultra Fast Broadband (UFB) access services throughout most of New Zealand. The deployment of Infinera's DTN-X platform is a crucial part of our strategy to provide unintended, reliable, cost-effective data services between New Zealand's UFB Point of Interconnect, which are becoming the key locations for data aggregation in New Zealand."

"The partnership with FX Networks to deploy this massive optical network across New Zealand is a significant change in this country," said Steve Cotter, CEO of REANNZ. "With the Infinera supper-channels we will be able to offer up to 100GbE services providing our scientific community with the fasters network technology available today, putting them on a level playing field with the rest of the world."

"Infinera is pleased to work with our in-country partner Dimension Data to deliver and support this multi-terabit optical networks across New Zealand for FX Networks and REANNZ," said Andrew Bond Webster, VP Sales, APPAC, for Infinera. "The Intelligent Transport Network offers differentiated services while reducing operating costs through scale, multi-layer convergence and automation, enabling high-capacity services to be delivered quickly throughout the country."