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Twinax Cable Knowledge
- Cable Labeling as Part of Data Center Management
- How to Correctly Run cables On Servers in a Data Center?
- 4 Realities You Should Consider 10G Ethernet for Your Business
- Is it finally the end of copper?
- Why We Need Both 40G and 100G Ethernet Cable?
- What is Twisted Pair Cable?
- Benefits of Twisted Pair Cable Construction
- Why Copper Is Used in Cables?
- A Brief Look at Ethernet Cable Construction
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Twinax Cables are mainly used with PCI or PCI-E Card for the short distance interconnection in the server room.
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Stable Transmission Speed
Reliable Transmission
Various Length Selection
Wider Operating Temperature
Good for HPC
Good for Data Center
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Why AOCs need testing?
Active optical cables (AOCs) have, in many places, replaced electrical cables for 10Gbit/s and higher applications. And why not? AOCs are lighter and can move data faster than wires. The weight and size savings alone provide better air flow, which improves cooling of server farms and communications networks.
An AOC consists of two optical/electrical (O/E) converters connected through a fiber-optic cable, shown in the photo below. The electrical interface must conform to an electrical-interface standard such as InfiniBand, Fibre Channel, Ethernet, USB 3.0, Thunderbolt, or HDMI. The cable below has a QSFP+ electrical interface at each end.
AOCs need testing, not just in the engineering, but in production. To accomplish that task, Multilane, a maker of optical and electrical data test equipment, has assembled an AOC production test system.
The diagram below shows the system. It consists of a set of modular instruments:
- A four-lane, 16Gbit/s BERT (bit-error rate tester), which functions as a programmable pattern generator
- A DSO (Digital Sampling Oscilloscope), which provides eye diagrams and jitter analysis
- A QSFP+ host with extended support to enable four corner testing.
AOCs are being used more and more to establish high-speed Ethernet and Infiniband backbone connections for cloud computing, handling signals up to 100Gbit/s. The need for cloud bandwidth is driven by the explosive growth in the use of internet bandwidth and storage as required by smartphones, tablets and other devices.
The AOC production testing system comes equipped with an API library, which lets a user communicate with all the hardware components to carry out AOC tests according to 40G Ethernet electrical specifications. Tests include voltage, current and power-consumption measurements, temperature measurements, bulk EEPROM programming for QSFP modules, PPG output signals, Eye Diagram and Jitter measurements, and BER with J2-J9 bathtub curve measurements and four-corner testing.
Do you test active optical cables? If so, what equipment do you use and what tests do you perform?
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