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Amphenol Guide to CX4 Cables (CX4 Cable FAQ)
What You Really Need to Know About 10GbE-CX4 Cables...

By: Nick Blas - Product Marketing Manager
Network Engineers have a plethora of cabling options when it comes to installing a 10-Gigabit Ethernet compliant backbone, but which solution is truly optimal under the circumstances?  10-Gigabit Ethernet CX4, aka 10GbE-CX4 or 10GBASE-CX4, combines low cost, low latency, and low power consumption for the ultimate short-distance link.  Although CX4's popularity has grown rapidly in recent years, there is still a great deal of confusion and misinformation regarding this technology.  Our exclusive Guide to CX4 Cables will help with all of your CX4 related questions.

Question 1:   What is CX4?
CX4, also known by its IEEE designation, 802.3ak, supports 10-Gigabit Ethernet data transfer over 4-lanes of copper cabling in each direction (8-lanes total).  In order to rapidly bring this technology to market, the IEEE workgroup designed CX4 to utilize field-proven InfiniBand type cabling and connectors.  Nearly one quarter of the world's Top 500 super computers utilize InfiniBand interconnects for mission-critical applications, making it an ideal choice for CX4 use.  While InfiniBand is more proprietary in nature and requires licensing fees, CX4 is based on an Open Source MSA (Multi-Source-Agreement), allowing any manufacturer to develop CX4 products at significantly lower costs.
Question 2:   What is CX4 Used For?
CX4 is primarily used as a 10-Gigabit Ethernet interconnect for backbone applications.  With the rapid rise of Gigabit Ethernet at the desktop level (1000BASE-T), a broader data pipeline is required on the back-end to aggregate data between servers.  Therefore, it is not uncommon to see CX4 capable switches installed in nearly any environment, including data centers, enterprise networks, or even HD video distribution hubs. 
Question 3:   Are there any Limitations to CX4?

CX4 interconnects offer the advantages of low-cost, low-latency, and low-power consumption at the expense of range.  The length limitation for CX4 is 15m (49ft) when using passive cable assemblies.  Some novel solutions exist which use active signal boosters or fiber optics to achieve lengths beyond 15m, but these solutions negate the cost, latency, and power benefits inherent to CX4 technology.  Fortunately, lengths beyond 15m are rarely needed, since most switches reside in close proximity within a wiring closet.

Question 4:   What do I Need to Integrate CX4 into my Network?

Depending upon your particular requirements, several upgrade paths exist to integrate CX4 into your network.  Many switches from companies such as HP, Cisco, and Intel can be upgraded with a CX4 plug-in module.  These CX4 modules are available in XENPAK, X2, and XFP configurations.  Another option is to purchase a new CX4 capable switch.  These high performance switches often feature a combination of CX4 ports and standard RJ45 ports for Gigabit Ethernet.  Nearly all servers with PCI-Express slots can be upgraded with a CX4 enabled PCI-E NIC card.  Finally, you will need quality CX4 Cables to connect to your gear.

Question 5:   What Types of Connectors are used on CX4 Cables?

A properly designed CX4 cable should feature die-cast SFF-8470 InfiniBand type latching connectors.  These connectors are easy to engage and will maintain continuity even if significant strain or vibration exists along the body of the cable.  SFF-8470 thumbscrew style (i.e. SAS) connectors should be avoided since most equipment does not support them.  Amphenol CX4 cables utilize the best connector on the market today, the Fujitsu microGiGaCN™.  The microGiGaCN is the market’s original high-speed, differential-signal, copper interconnect for high-performance (data I/O) applications.

Question 6:   How Does CX4 Compare with 10GBase-R & 10GBase-T?

CX4 has numerous advantages over 10GBase-R (Fiber) and 10GBase-T (Cat-6).  An optical connection would require (2) 10-Gig optical modules and a fiber patch cord to function.  This has significant cost and power budget implications.  Running 10-Gigabit Ethernet over UTP cabling like Cat-6 may sound promising, but it is plagued by power consumption and latency issues.  Today's 10GBase-T chipsets are power hogs, as they require several Watts just to separate out signal noise.  Here's a comparison of how CX4 stacks up in terms of power-consumption in a 50-server datacenter.  Essentially, CX4 consumes 6x-20x less power. 

Power Comparison Chart

Question 7:   What is SpectraStrip SKEWCLEAR Cable?

SKEWCLEAR® is a proprietary shielded parallel pair wire technology designed and built by Amphenol SpectraStrip.  When transferring high-speed data over copper, signals will often arrive out of sync.  This problem, known as skew, can lead to the complete collapse of signal integrity.  SKEWCLEAR®,cable utilizes a novel manufacturing approach directed towards reducing within-pair and pair-to-pair time delay/amplitude-skew, critical for today's high bandwidth applications.  All Amphenol CX4 cables feature SKEWCLEAR® wire.

Amphenol SpectraStrip SKEWCLEAR CX4 InfiniBand Cabling

Question 8:   Why Choose Amphenol Brand CX4 Cables?

As one of the world's top three manufacturers of CX4 Cables, Amphenol is ready to meet the stringent demands of any potential 10-Gig network install, large or small.  Assembling 10-Gig capable interconnects is often more of an art than a science.  By using premium grade components and Amphenol-pioneered manufacturing techniques, Amphenol brand CX4 cables are simply the best cabling option on the market today.  Best yet, Amphenol brand CX4 cables are always in-stock and ready for same-day shipping at

Question 9:   Are Amphenol CX4 Cables Compatible with InfiniBand?

Absolutely.  Since CX4 cables share the same core architecture as InfiniBand cables, we took the liberty of dual qualifying our CX4 cables for both SDR and DDR InfiniBand.  Therefore, Amphenol CX4 cables will function as drop-in replacements for InfiniBand applications.  In addition to InfiniBand compatibility, Amphenol CX4 cables can be used in place of any competing CX4 cable from Gore, Tyco, Belkin, QLogic, HP, IBM, Cisco, and 3COM. Click below to download the Amphenol CX4 Cable Cross Reference Chart:

Amphenol 10GbE-CX4 Cable Cross Reference Chart

If you are in the market for High Speed Copper Cable Assemblies, such as CX4 Cables, HD Mini-SAS Cables, SFP+ Cables, QSFP Cables or QSFP+ Cables, today marks the perfect time to buy with our 2013 High Speed Savings Event. Great pricing is guaranteed -- Save 20%!
With the combined R&D and manufacturing resources of half-a-dozen Amphenol divisions, Amphenol High Speed Interconnects (AHSI) is the first major interconnect company to release 25-Gigabit Ethernet SFP28 and 100-Gigabit Ethernet QSFP28 Cables to the online marketplace with its exclusive partnership with Amphenol Cables on Demand (ACD). Now, you can purchase these revolutionary cable products factory-direct at a 25% OFF discount below:
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MTP / MPO Fiber Optic Patch Cables -- New from Amphenol Cables on Demand. MTP/MPO is the industry standard interconnect solution for high density fiber optic networks. All of our MTP/MPO cable assemblies are made with superior 10Gb OM3 50/125 multimode cabling in a standard 12-Fiber Female to Female straight-thru patch cord or in the newly popular 8-Fiber 40Gb QSFP splitter patch cord that splits the MTP/MPO Female connection into (4) Duplex Male LC connectors -- Perfect for connecting a 40G QSFP/QSFP+ optical transceiver module to (4) separate SFP+ 10G optical transceiver modules. As a bonus, our MTP/MPO cables feature genuine US Conec brand MTP® connectors for enhanced performance capabilities and backwards compatibility with the open-standard MPO connector.

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