For short-diHigh-performance and cost-effective solutions are the first choice for user network deployment. stance 40G network deployment, QSFP + DAC high-speed cable and QSFP + AOC active optical cable have low cost and high efficiency, and are widely used in enterprise network and data center, such as the connection between switch and server. What do you know about these two kinds of cables? What is the difference between QSFP + DAC high speed cable and AOC active cable? What's the difference between these two kinds of cables and QSFP + optical module connected with optical fiber?
What is QSFP + DAC high speed cable?
40G QSFP + DAC high-speed cable is a high-speed biaxial cable with QSFP + connectors at both ends. The cable mainly adopts silver plated conductor, insulating core wire of physical foaming polyolefin material, and wire pair shielding or total shielding. Generally, the wire gauge of shielded cable (copper cable diameter) is between 24 and 30awg. The larger the wire gauge value is, the higher the grade of the wire through the hole is, the smaller the diameter of the wire is. Therefore, the longer the DAC high-speed cable is, the smaller the wire gauge is. This can effectively reduce the loss of signal transmission, that is, the smaller the wire gauge number is, the longer the transmission distance is.
QSFP + DAC type
QSFP + DAC high-speed cable can be divided into two types: active and passive. The passive QSFP + DAC high-speed cable has no driver chip, so it can transmit signal without electric energy drive, and the signal will not be amplified or balanced in the process of transmission. Generally speaking, the maximum transmission distance of passive QSFP + DAC high-speed cable is 7 meters, while the active QSFP + DAC high-speed cable has a driver chip for signal conditioning, so its transmission distance is slightly longer, about 10 meters or even longer.
Application of QSFP + DAC
Nowadays, QSFP + DAC high-speed cables on the market include 40G QSFP + to QSFP + DAC high-speed cables and 40G QSFP + to 4 * SFP + high-speed branch cables. The application scenarios of these two kinds of QSFP + DAC high-speed cables are different. Among them, QSFP + to QSFP + DAC high-speed cables are mainly used for short-distance 40G link direct connection, such as 40G switch and 40G network card direct connection; while QSFP + to 4 * SFP + branch DAC high-speed cables can split 40G signal into four 10G signals, so it is mainly used for 10G-40G network upgrade.
What is QSFP + AOC active optical cable?
QSFP + AOC active optical cable is composed of optical fiber and two QSFP + connectors (one at each end). The optical fiber of QSFP + AOC active optical cable is multimode optical fiber, and the QSFP + connection on QSFP + AOC active optical cable is actually QSFP + optical module. Therefore, the structure and price of QSFP + AOC active optical cable is more complex and expensive than that of QSFP + DAC high-speed cable. QSFP + AOC active optical cable needs external power supply to realize the conversion of electrical signal and optical signal, and the maximum transmission distance can reach 100 meters.
QSFP + AOC type
At present, the industry has launched various QSFP + AOC active optical cables for different 40G transmission application scenarios, including three types (mainstream) of 40G QSFP + AOC active optical cable, 40G QSFP + to 4 * SFP + active branch optical cable and 40G QSFP + to 8 * LC active branch optical cable (namely 40G QSFP + to 4 * duplex LC active branch optical cable). In addition, some suppliers can also provide customized service of 40G QSFP + to 8 * SC / ST / FC active branch optical cable.
Application of QSFP + AOC
QSFP + AOC active optical cable is a cost-effective solution, which can be used for the interconnection of two 40G switches. 40G QSFP + active branch optical cable is suitable for 10G-40G network upgrade. It should be noted that 40G QSFP + to 8 * LC active branch optical cable requires four 10G SFP + optical modules to connect LC duplex connectors.
What is the difference between QSFP + DAC and QSFP + AOC?
Working principle
Because of the different structures of QSFP + DAC and QSFP + AOC, their working principles are different. Both passive and active QSFP + DAC can use copper cable for signal transmission. The passive QSFP + DAC can directly transmit without signal adjustment, and the active QSFP + DAC can amplify and then transmit the signal by built-in driver chip. The signal transmission of QSFP + AOC is completed by optical fiber, and it can only realize the conversion of electrical signal to optical signal and then to electrical signal with the help of external power supply.
Transmission distance
It can be seen from the above that QSFP + AOC active optical cable transmits signal through optical fiber, while QSFP + DAC high-speed cable transmits signal through copper cable. Therefore, the transmission capacity of QSFP + AOC active optical cable is stronger than that of QSFP + DAC high-speed cable, and the maximum transmission distance is about 100 meters. At the same time, QSFP + AOC has smaller bending radius and more flexible routing.
Cost
In terms of structure, QSFP + DAC has simple structure and few components, and its cost is usually lower than QSFP + AOC.
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