10G SFP+ Cu Introduction

The 10G SFP+ Cu (shorthand for that 10G SFP+ copper direct attach cable) media type isn't specified by the 802.3 standard, as well as the shorthand identifier was introduced by the vendors who developed this cable type. This low-cost short copper cable segment is beneficial, as an example, for interconnecting a collection of switches, as well as for short-distance connections between switch ports and Ethernet interfaces on servers as well as other devices. Before the growth and development of 10GBASE-T, this Direct Attach Cable (DAC) was the only real low-cost copper connection designed for 10 Gbps operation.

The DAC is terminated having a Small Form-Factor (SFF) connector module named the SFP+ (Small Form-factor Pluggable Plus). The SFP+ Transceiver module suits a port that's roughly the size of an RJ45-style port, so that it is feasible for vendors to offer a higher port density on their own switches.A 10G SFP+ Cable shown as below:

10Gbase SFP+ Direct Attach Cable

The SFP+ module isn't standardized from any official standards body,but rather is specified by a Multi-Source Agreement (MSA) which was developed among competing manufacturers. MSAs will be the primary method used to develop communications connectors and transceiver modules which are utilized in Ethernet as well as other network systems. As technology advances, cabling and equipment vendors work with each other to develop smaller and much more efficient connectors and modules, with all the MSA being a rapid way of developing these enhancements. The SFP+ will be the second generation of the SFP+ standard. The classic SFP+ specifications support operation up to 4.5 Gbps. The SFP+ features support for 10 Gbps or better signaling, according to improved impedance matching specifications for much better signal transmission.

Vendors provide both active and passive versions of the 10GSFP+ Cu DAC. An DAC assembly is recognized as active in case there are signal processing electronics in the SFP+ module to increase signal quality and supply a lengthier cable distance. The lowest priced approach is the passive DAC, which has a tendency to be shorter; the active DAC can make it a possibility to support longer and thinner cable assemblies. The accessible cable lengths range from 1 m to 7 m, even though you will discover variations in supported cable lengths among different vendors.

The direct attach SFP+ Twinax cables use the same SFP+ connector module which is used on 10 Gbps optical fiber links. However, instead of utilizing an optical transceiver each and every end as well as a length of fiber optic cable, the DAC uses the SFP+ module, taking away the expensive optical lasers along with other electronic components. Both in active and passive cables, a smaller electrical component is used to recognize the SFP+ module and cable type to the Ethernet interface; that component is lower price and consumes not much power.

A DAC Cable is a limited assembly that's bought at confirmed length, using the SFP+ modules permanently attached with each side of the cable. Although significantly thinner than 10GBASE-CX4 cable, it is stilla comparatively stiff cable. To set up the cable on anything apart from closely associated equipment, you've got to be ready to route the cable and it is attached SFP+ modules through any intervening cable management trays and cable guides.

Reference: Fiberstore

The Advantages Of QSFP+ PSM4 AOC

40G QSFP+ AOC has been introduced Few days ago,Today we are going to introduce Fiberstore’s QSFP+ (Quad Small Form-factor Pluggable Plus) PSM4 (Parallel Single Mode Quad) Active Optical Cables (AOCs) which use a Silicon Photonics (SiPh) optical engine and use lower cost singlemode fiber for transmission distances up to 4km. QSFP+ cables are used for 40GBASE and Infniband standards, to maximize performance.Whether QSFP+ PSM4 AOC and 40G QSFP+ AOC, is one of the Direct Attach Cable.

ADVANTAGES OF SIPH-BASED PSM4 SOLUTION FOR 4-KM REACH

Multiple forces are driving the implementation of PSM4 and SiPh in next generation data-center designs and architectures. PSM4 and SiPh fill an important gap in data-center interconnect options, the gap between the reach of 25G multimode options and that of Long Range (LR) optical approaches. Using pigtail designs with these technologies can ease implementation via easy mating to structured cabling. From a futureproofing perspective, PSM4 is an approach that can accommodate both current and future bandwidth upgrades. A SiPh-based PSM4 approach helps resolve the multiple challenges of higher bandwidth, longer distances, low power, and futureproofing. SiPh-based LR PSM4 products offer seven primary advantages.

Distance: With transmission distances up to 4 km, they can accommodate most, if not all, new data-center requirements. Power: SiPh-based AOCs use basically the same power consumption as VCSEL-based products: under 1 W for a 10G QSFP+ AOC and 1.5 W at 25 Gbps. Cost: The cost is roughly the same as VCSEL-based AOCs, but since they are single mode (SM), they use much less expensive SM cable. As speeds increase, VCSEL-based products require ever more expensive types of fiber. After most networks have upgraded to OM3, an upgrade to OM4 can be costly. And what comes after OM4, and how soon will it be needed? With SM SiPh AOCs, the fiber remains inexpensive SM and stays consistent as data rates increase. Futureproof Structured Cabling: Upgrading structured cabling is less economically viable as speeds continue to increase. PSM4 can accommodate 10 GbE, 40 GbE, 4x10 Gbps aggregated QDR Infiniband, 4x14 Gbps FDR Infiniband, 100 GbE, 4x25 Gbps aggregated. Pigtail Plug-in Options for Ease of Installation and Upgrades: PSM4 AOCs are available in pigtail versions. Here, one end is a traditional QSFP+ active interface and the other either MPO or LC connectors. This enables a quick connection to structured cabling (so the AOC side doesn't have to be pulled long distances) and the ability to quickly upgrade as needed with no costly structured cabling upgrade and associated data-center downtime. SiPh Actives Becoming Broadly Available: An ecosystem of proven, reliable, cost-effective SiPh devices exists to accommodate SM data-center links. SiPh is widely deployed today in PSM4 AOCs, and several new entrants into the market are offering a variety of options. SiPh Offers a Path Beyond 25G: VCSELs face increasing challenges as speeds increase. With SiPh-based systems, most modulating schemes have a clear and well-understood technology path to 50G, 100G, and beyond.

SM SiPh bridges the gaps caused by the dual requirements of longer distances and higher data transmission speeds. With a broad base of products both available and being developed by multiple suppliers, PSM4 and SiPh AOCs can be deployed today to enable new data-center architectures, with the assurance that they'll provide a path to cost-effectively meet future upgrade requirements.

Fiberstore offers 40GBASE QSFP+ to QSFP+ active optical cables with lengths of 10m to 100m.Lengths and compatible brands can be customized up to customers' requirements.So,if you or your friends want to buy qsfp 4x10g aocs, Fiberstore could be your first choice!

Article source:http://www.fiberstore.com/QSFP+-PSM4-Active-Optical-Cables-Tutorial-aid-402.html

Features And Benefits Of QSFP+ PSM4 AOC

• Low power consumption of less than 0.78W QDR and 1.1W FDR per cable end, 30% less than competition: Improves overall data-center power consumption and thermal efficiency. Enables deployment of additional ports for increased number of AOCs per system, resulting in more connectivity options and total system cost savings.
• Four bi-directional (BIDI) optical data links per end, operating at data rates from 1.0 to 14.0 (aggregated 56.0) Gbps for FDR versions and 1.0 to 10.3125 (aggregated 40.0) Gbps for QDR versions: Compatible with multiple protocols including InfiniBand Fourteen Data Rate (FDR), 10 Gbps Ethernet, Fibre Channel (8 and 10 Gbps), SAS 2.1 and 3.0 (6 and 12 Gbps) and other protocol applications.
• Low Bit Error Rate (BER) of 1E-18: Provides increased data reliability and robustness of link versus standard transceivers with 1E-12 errors per link.
• QSFP+ PSM4 to MPO cables available with loss budgets of 2 and 4dB, enabling links up to 4km: Supports use in structured cabling systems.
• Lower cost option versus standard transceivers and cable assemblies: Allows for significantly more structured, economical cable links.
• Low-loss singlemode pigtail versions available: Ensures network is capable of handling future bandwidth increases. Minimizes future highcost cable upgrades as bandwidth requirements increase.
• QSFP+ PSM4 to QSFP+ PSM4 AOC cables are permanently attached to the fiber, with no air gaps: Interface provides protection from environmental contaminants and other user disturbances during installation.
• Firmware is field flashable via an I2C bus: Ensures cables can be re-flashed while in the host system.

Article source: http://www.fiberstore.com/QSFP+-PSM4-Active-Optical-Cables-Tutorial-aid-402.html

40G Ethernet Fiber Optic Transceiver

There are two 40Gigabit fiber optic physical medium dependent (PMD) specifications within the standard, which offer 40Gb/s Ethernet over multimode fiber optic (MMF) cable and single-mode fiber optic (SMF) cable. The 40GBASE-SR4 short reach fiber optic system sends four lanes of PCS data over four pairs of multimode cables, for a total of eight fiber strands. The 40GBASE-LR4 long-reach system sends four lanes of PCS data over four wavelengths of light, carried over a single couple of fiber optic cables.

The first 40G transceivers were based on the C form-factor pluggable (CFP) module, that is a large module capable of handling up to 24 watts of power dissipation. First-generation transceivers with multiple chips and bigger power requirements were according to this module. The CFP module is specified by a multiagreement.3

Figure 1 shows a CFP module, that you can use to offer either a 40GBASE-SR4 or a 40GBASE-LR4 transceiver. The module shown with this figure is a 40GBASE-LR4 transceiver, which supplies two SC fiber optic connectors for link to a pair of single-mode fibers. The entire process of the 40GBASE-LR4 connection is described later in this particular chapter.

Figure 1 40GBASE-SR4 CFP

The most famous connector for 40Gb/s interfaces currently is the QSFP+ module: it requires up far less space on a switch or server interface, making it possible for vendors to offer multiple QSFP+ ports in the same space as a single CFP port. The QSFP+ transceiver module for 40GBASE-SR4 is supplied with a multifiber push-on (MPO) media connector, carrying multiple pairs of fiber optic cables to support the four lanes of data for the short reach fiber standard. The 40GBASE-LR4 long-reach system uses a QSFP+ transceiver designed with a duplex fiber connector to connect for the single pair of fiber cables.

The MPO plug supports the eight fiber cables needed to supply a 40GBASE-SR4 connection, plus four fibers which are unused. The MPO plughas two alignment pins, that help keep each connector and it is fibers correctly aligned once the two connectors are mated. Also shown is an end-on have a look at a plug connector, which shows the 12 fibers arranged between the two alignment pins. Note that the important thing on the plug connector means that the plug connector might be correctly oriented from the socket.

Figure 2 shows a single-mode fiber optic cable terminated in an LC optical plug connector. Also shown is a 40G QSFP+ to 8 LC Connetor Breakout Active Optical Cable.

Figure 2 40GBASE QSFP+ to LC Connetor(8) Breakout Active Optical Cable

Fiberstore optical cables could be ordered in specific lengths is actually specific connector types, as needed from your circumstances. If you're connecting an optical jumper cable from the 40G QSFP+Transceiver module in a switch port straight to a server interface, you'll need a brief cable using the correct cable connectors on each side. For 40GBASE-SR4, this cable might have MPO connectors on both ends. If you're connecting a 40G QSFP+ Transceiver module in a switch port to an optical connector termination reason for your data center or cabling closet, the optical connectors in your termination point may be different from the ones suited for the 40G QSFP+ Transceiver module, requiring a cable having a different type of optical connector on both ends.

The Introduction Of 40G QSFP+ AOC

The 40G QSFP+ Active Optical Cable (AOC) is a parallel 40Gbps Quad Small Form Factor Pluggable (QSFP+) Active Optical Cable, which supplies higher port density and total system cost. The QSFP+ optical modules provide four full-duplex independent transmit and receive channels, each are able of 10Gbps operation 40Gbps aggregate bandwidth of at least 100m long multimode fiber.

The 40G QSFP+ AOC is according to QSFP+ Multi-Source Agreement(MSA) design and shape, optical/electrical connections and digital diagnostic interface. It is designed to meet the most demanding external operating conditions including temperature, humidity and EMI interference. This module supplies a quite high functionality and feature integration, through a two-wire serial interface to reach.

40G QSFP+ AOC Functional Description

The TF-QQxxx-N00 converts parallel electrical input signals using a laser driver and a Vertical Cavity Surface Emitting Laser (VCSEL) array into parallel optical output signals. The transmitter module accepts electrical input signals which can be voltage suitable for Common Mode Logic (CML) levels. All input data signals are differential and therefore are internally terminated. The receiver module converts parallel optical input signals using a receiver and a photo detector array into parallel electrical output signals. The receiver module outputs electrical signals, which are voltage suitable for Common Mode Logic (CML) levels. All data signals are differential and support a data rates as much as 10 Gbps per channel.

A single+3.3V power is needed to power up the module. Both power source pins VccTx and VccRx are internally connected and will be used concurrently. As per MSA specifications the module offers 7 low speed hardware control pins (including the 2-wire serial interface): ModSelL, SCL, SDA, ResetL, LPMode, ModPrsL and IntL.

Module Select (ModSelL) is an input pin. When held low by the host, the module responds to 2-wire serial communication commands. The ModSelL allows the use of multiple QSFP+ modules on a single 2-wire interface bus ¨C individual ModSelL lines per QSFP+ module can be used.

Serial Clock (SCL) and Serial Data (SDA) are needed for the 2-wire serial bus communication interface and let the host to connect to the QSFP+ memory map.

The ResetL pin to produce a complete module reset, the return capsule back to the default state , when within the ResetL pin low hold time is longer than the minimum pulse length . Master reset should be performed bit desperate state until reset interrupt instructions to finish the module .

Low Power Mode (LPMode) pin can be used to set the maximum power consumption for the module so that you can protect hosts that aren't capable of cooling higher power modules, should such modules be accidentally inserted.

Module Present (ModPrsL) is a signal local to the host board which, even without the a module, is generally pulled up to the host Vcc. When a module is inserted in to the connector, it completes the path to ground though a resistor on the host board and asserts the signal. ModPrsL then indicates a module happens by setting ModPrsL to a "Low" state.

Interrupt (IntL) is an output pin. When "Low", it indicates a probable module operational fault or a status critical to the host system. The host identifies the origin of the interrupt with all the 2-wire serial interface. The IntL pin can be an open collector output and should be pulled to the Host Vcc voltage on the Host board.

40G QSFP+ Active Optical Cable (AOC) is a high performance, low power consumption integrated cable for short-range multi-lane data communication and interconnect applications, supporting 40G Ethernet, fiber channel and PCIE. It is compliant using the QSFP+ MSA and IEEE P802.3ba 40GBASE-SR4. It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference. Fiberstore QSFP+ Cables can be found in various lengths along with other options.

QSFP+ Breakout Cables

QSFP+(Quad Small Form-Factor Pluggable Plus) cables offer a high density, high bandwidth, cost-effective solution for a number of markets and applications including switches, routers, HBA's, top rated computing and mass storage sub-systems by mfr's such as IBM, qLogic, Cisco, etc. QSFP+ cables are created for data rates up to 40Gb/s supporting Fibre Channel, Ethernet, SDH/SONET and Infiniband standards.

Breakout Cable

Breakout cable is a hybrid solution. In the breakout cable, each fiber is treated like a separate unit, complete with a sheath and strength member. This design eliminates the necessity for a breakout kit, as the sheath allow you to attach connectors easily.

Breakout cables let fiber subunits move freely, and so they protect each fiber due to their thicker coating/strength member arrangement. Each fiber subunit is configured as a tight tube. Breakout cables also come designed with a separate strength member similar to the loose-tube design.

Breakout cable is really an optical fiber cable containing several jacketed simplex optical fibers packaged together in an outer jacket. This can be different from distribution-style cable, in which tight-buffered fibers are bundled together, with simply the outer cable jacket of the cable protecting them. The style of breakout-style cable adds strength for ruggedized drops, though the cable is greater and much more expensive than distribution-style cable. Breakout cable is acceptable for brief riser and plenum applications as well as use in conduits, in which a quite simple cable run is planned to avoid the use of any splicebox or spliced fiber pigtails.

Because each fiber is individually reinforced, the cable can be easily divided into individual fiber lines. Each simplex cable inside the outer jacket might be broken out after which continue like a patch cable, for instance in a fiber to the desk application in an business building. This permits connector termination without requiring special junctions, and can reduce or eliminate the need for fiberoptic patch panels or an optical distribution frame. Breakout cable requires terminations to be done with simple connectors, which may be preferred for some situations. A more common solution today is the use of a fanout kit that adds a jacket to the very fine strands of other cable types.

QSFP+ Breakout Cables create a great cost-effective interconnect means to fix IT professionals by giving much needed space for data centers and cost cuts. The cables provide inexpensive and low power consumption interconnect solution for 40-Gigabit Ethernet, Fibre Channel, QDR InfiniBand, 10 Gigabit applications and other industry standards. We provide QSFP+ to 4 SFP+ Passive Copper Breakout DAC, QSFP+ to 4SFP+ Breakout AOC and QSFP+ to eight x LC AOC. Custom cables can be found in various lengths along with other options.

Figure 1 A QSFP+ to 4 SFP+ Breakout Cable

QSFP+ to 4 SFP+ Breakout Cables

QSFP+ to 4 SFP+ hybrid splitter cables produce a great cost-effective interconnect strategy to IT professionals by giving necessary space for data centers and price cuts. These cables permit you to connect your QSFP+ and SFP+ Switches and Network cards without upgrading your entire data center or storage array. They can be used for QDR infiniBand, 40 Gigabit Ethernet and 10Gigabit applications. Each QSFP-SFP+ splitter cable includes a single QSFP connector (SFF-8436) rated for 40-Gb/s on one end and (4) SFP+ connectors (SFF-8431), each rated for 10-Gb/s, on the other side. We currently provide several lengths to support your installation requirements.

QSFP+ Breakout Cables provide low cost and low power consumption interconnect solution for 40-Gigabit Ethernet, Fibre Channel, QDR InfiniBand, 10 Gigabit applications and other industry standards.

40GBASE-CR4 QSFP+ Direct Attach Cable

The 40GBASE-CR4 short reach copper segment is defined in Clause 85 with the standard. It specifies a media system according to four lanes of PCS data carried over four twinaxial cables. A twinaxial cable is just like coaxial cable, with the exception that each twinaxial cable has two inner conductors instead of the single conductor seen in coaxial cable.

The 40GBASE-CR4 standard defines a medium dependent interface that's using a quad small form-factor pluggable (QSFP+) connector, referenced within the IEEE standard as small form-factor specification SFF-8436. The QSFP+ module isn't standardized with a formal standards group, but instead is specified by a multisource agreement (MSA) produced by competing manufacturers.

As technology advances, cabling and equipment vendors work together to develop smaller and more efficient connectors and modules.While the segment length is specified up to 7 m, some vendors provide both active and passive versions with the 40GBASE-CR4 cable, using the active versions capable of longer segment lengths. As an example, a vendor offer lengths of 1, 3, and 5 m in passive cables, with 7 and 15 m supported in active cables. You'll find variations in supported cable types and lengths among different vendors, and it's up to you to verify the sup? ported cable lengths on the equipment you purchase.

The QSFP+ transceiver and connector module used on the copper cables is exactly the same basic module as that used on 40Gb/s optical fiber links. However, instead of providing an optical transceiver at each end to which a fiber optic cable is connected, the 40GBASE-CR4 cable uses the QSFP+ module but leaves out the expensive optical lasers.

A fixed-length 40GBASE-CR4 direct attach cable segment, that is always sold with the QSFP+ modules permanently attached to each end of the cable. This cable provides four pairs of conductors in a fairly thick cable, with an outer di? ameter which range from 6.1 mm (0.24 inches) for a 1 m cable up to 9.8 mm (0.39 inches) for a 7 m cable length. The bend radius is typically specified as being 10 times the outer diameter. That might lead to a bend radius of from 6.1 cm (2.4 inches) to 9.8 cm (3.85 inches) for the cable outer diameters mentioned.

The QSFP+ module itself is roughly three inches in length, not including the plastic tab that, when pulled, disengages the connector from the port. This will make for a fairly long connector assembly on either side of the cable, and to connect anything besides closely associated equipment, you've got to be capable to route the cable and the permanently attached QSFP+ modules through any intervening cable management trays and cable guides.

Although QSFP+ transceiver module has 38 contacts on it, the 40GBASE-CR4 standard only specifies the set of contacts needed for transmitting and receiving four lanes of data. The signal crossover from source lane (Tx) to destination lane (Rx) is supplied from the wiring scheme specified by the standard.

Fiberstore offers 40G QSFP+ Cables in various lengths and other options ,these cables can be used a direct replacement for OEM cables (e.g., Cisco etc.). These carrier-grade cables are utilized in tier-1 service providers, data centers, hospitals, universities, and enterprises across The United States.