Tag Archives: QSFP+ cables

QSFP+ in the 40 Gigabit Ethernet Fibre Optic Media Systems

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

The first 40 Gb/s transceivers were based on the C form-factor pluggable (CFP) module, 40G CFP transceiver which is a large module capable of handling up to 24 watts of power requirements were based on this module. The CFP modules is specified by a multiagreement.

CFP module, which can be used to provide either a 40GBase-SR4 or a 40GBase-LR4 transceiver. The module is a 40 GBase-LR4 connection is described. The most popular connector for 40 Gb/s interfaces these days is the QSFP+ module: it takes up much less space on a switch or server interface, making it possible for vendors to provide multiple QSFP+ transceiver module for 40GBase-SR4 is provided with a multifibre push-on (MPO) media connector, carrying multiple pairs of fibre optic cables to support the four lanes of data for the short reach fibre standard. The 40GBase-LR4 long-reach system uses a QSFP+ transceiver equipped with a duplex fibre connector for connecting to the single pair of fibre cables.

Recently Molex Incorporated, the world’s largest plug-in companies introduced the QSFP+ interconnect solution designed for a multimode of markets and applications including switches, router, Host Bus Adapters (HBAs), enterprise data centres. high-performance computing (HPC) and storage. Components of the system include the Electromagnetic Interference (EMI) shielding cage, passive cable assembly, active cable assembly, optical MTP cable assembly, optical QSFP+ loopback, and a 38-circuit SMT iPass host connector.

“The QSFP has evolved to QSFP+ to meet 40Gbps data rates just as SFP progressed from SFP to SFP+ for 40 Gbps rates. The original QSFP MSA now resides as INF-8438 and is no longer an appropriate designation for use, being superseded by SFF-8436 in the SFF Committee,” said Jay Neer, advanced technical market manager, industry standards, Molex Incorporatd.

QSFP+ uses a standard 38-circuit iPass SMT host connector with a proven mating interface that connector with a proven mating interface that enables high durability. The iPass SMT host connector with a proven mating interface that enable high durability. The iPass contact design, also implemented in other standards such as PCIe, SAS, SATA, Ethernet and InfiniBand, provides four balanced differential channels featuring class-leading isolation, and bandwidth, with durability cycling up to 250 cycles. The Molex host connector mounts to the PCB beneath a low-profile metal cage that provide latch points and is engineered to provide appropriate EMI protection for the host system port. Optional light pipes and heat sink thermal solutions can be slipped onto the cage when needed.

The QSFP+ cables assemblies are designed to accommodate stacked and ganged connector configurations in extremely high density requirements. They support 40G Ethernet, InfiniBand, SAS and SONET/SDH standards with different data rate options.

The optical QSFP+ MTP cable assemblies and loopbacks meet the QSFP+ interface specification. Cables are constructed with 12-fibre 3.00mm round cable for data centre interconnect cable assembly applications.

The round cable provides much improved cable management over the traditional flat ribbon cable. A robust 4.50mm round optical cable ensure cable integrity and improved cable routing for installations that require connections greater than 25m apart.

QSFP+ breakout cable assemblies are available for SFP+ or patch panel installations. Loopbacks feature a compact housing compatible with module spacing and loop optical transmit ports to receive ports for testing, burn -in, and field troubleshoot.

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The Introduction Of 40G QSFP+ AOC

The 40G QSFP+ AOC (40G QSFP+ 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 fibre.

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, fibre 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. FS.COM QSFP+ Cables can be found in various lengths along with other options.

QSFP to SFP+Breakout Cable Overview

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 like QSFP to QSFP trunk cable and QSFP to SFP+ breakout cable are created for data rates up to 40Gb/s supporting Fibre Channel, Ethernet, SDH/SONET and Infiniband standards.

What Is Breakout Cable?

Breakout cable is a hybrid solution. In a breakout cable, each fibre 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 cable lets fibre subunits move freely, and so they protect each fibre due to their thicker coating/strength member arrangement. Each fibre 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 fibre cable containing several jacketed simplex optical fibres packaged together in an outer jacket. This can be different from distribution-style cable, in which tight-buffered fibres 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 fibre pigtails.

Because each fibre is individually reinforced, the cable can be easily divided into individual fibre lines. Each simplex cable inside the outer jacket might be broken out after which continue like a patch cable, for instance in a fibre to the desk application in an business building. This permits connector termination without requiring special junctions, and can reduce or eliminate the need for fibre optic 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 to SFP+ breakout cables create a great cost-effective interconnect means to fix IT professionals by giving much needed space for data centres and cost cuts. QSFP to SFP+ breakout cable provides 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 SFP+ passive copper breakout DAC, QSFP to SFP+ breakout AOC and QSFP to 8 x LC AOC. Customised cables can be found in various lengths along with other options.

QSFP to SFP+ Breakout Cable

Figure 1 A QSFP+ to 4 SFP+ Breakout Cable

QSFP to SFP+ breakout 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 to SFP+ breakout 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 to SFP+ 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.