What is the 10G DAC and AOC high-speed cable?

- Nov 30, 2020-

What are the application scenes of 10G DAC high-speed cables and AOC high-speed cables?

Affected by the above factors, 10G DAC high-speed cables and 10G AOC high-speed cables are usually used in different working environments.


Typical application of 10G DAC high-speed cable

The main purpose of 10G DAC high-speed cables is to connect switches/servers to switches located in the same rack or adjacent racks, such as for interconnection of 10GToR switches and server rack ToR switches or stacking of 10G switches. Because 10G SFP+ DAC high-speed cables usually support 7m links, and have the characteristics of low power consumption, low latency and low cost, this DAC high-speed cable solution is an ideal choice for short-distance connections.

In addition, the 10G DAC high-speed cable solution can also be used in high-density ToR scenarios with more access layer equipment. Such distributed access makes the connection clear and clear, but it also increases the difficulty of centralized maintenance and management of the switch.


Typical application of 10G AOC high-speed cable

10G AOC high-speed cables are usually used in data centers, and there are applications in ToR, EoR and MoR. Similar to the DAC high-speed cable, the ToR switch between the network rack and the server rack can be connected through the 10G AOC high-speed cable, and the maximum transmission distance of the switch in the rack can be up to 100 meters.

For example, in EoR cabling, the server is connected to the switch through a 10G AOC high-speed cable, so that a large number of cable connections of multiple server cabinets are aggregated into the edge network cabinet. Such cable management is more difficult, but centralized maintenance is more convenient. The solution of using AOC high-speed cable in MoR wiring is basically similar to the EoR solution, while simplifying the connection and centralized management.


 What is the 10G DAC and AOC high-speed cable?

The 10G DAC high-speed cable consists of a twin-core copper wire and SFP+ connectors at both ends, which can be directly connected to active devices. DAC high-speed cables include passive DAC and active DAC, both of which can directly transmit electrical signals through copper wires. The difference is that the former can be transmitted without signal modulation, while the latter is equipped with electronic components inside the optical transceiver to enhance the signal. In general, 10G DAC high-speed cables are used in wiring racks to connect switches, servers, and storage devices.

The 10G AOC high-speed cable is composed of multi-mode fiber jumpers and SFP+ connectors connected at both ends. It requires an external power supply to complete the conversion of optical/electrical signals, first converting electrical signals into optical signals, and finally converting into electrical signals. Similar to the 10G DAC high-speed cable, the 10G AOC high-speed cable is mainly used for storage equipment, switches, and interconnection between switches and servers in the data center wiring racks.


What is the difference between 10G DAC and AOC high-speed cable?

By understanding the above content, it can be seen that the 10G DAC high-speed cable and the 10G AOC high-speed cable are different, and the specific manifestations are as follows:

Anti-electromagnetic interference ability: 10G AOC high-speed cable is stronger than 10G DAC high-speed cable

Electromagnetic interference (EMI) refers to the interference caused by the external power supply to the circuit. As mentioned earlier, 10G active optical cables contain optical fibers, which are dielectrics that cannot conduct electricity. Therefore, AOC high-speed cables are not subject to electromagnetic interference and can be used in most situations. However, the 10G DAC high-speed cable contains copper material, because copper will transmit electrical signals and is susceptible to electromagnetic interference. In order to avoid a series of problems such as system crashes and malfunctions, attention must be paid to the electromagnetic interference environment during use.

Power consumption: 10G DAC high-speed cable is smaller than 10G AOC high-speed cable

Under normal circumstances, the power consumption of a 10G AOC high-speed cable is 1-2W, which is higher than the power consumption of a DAC high-speed cable. The power consumption of a 10G active DAC high-speed cable is generally less than 1w, while the passive DAC high-speed cable has a power of even 0.15w due to the special heat dissipation design, which can be regarded as almost zero power consumption. Therefore, the use of DAC high-speed cable solutions can reduce operating costs generated by power consumption.

Ambient temperature: 10G DAC high-speed cable has a wider application range than 10G AOC high-speed cable

As mentioned above, the power consumption of the 10G DAC high-speed cable is very low, and the passive DAC has almost zero energy consumption and zero heat. Therefore, DAC high-speed cables are suitable for a wider ambient temperature range. Compared with the DAC high-speed cable, the 10G AOC high-speed cable has a limited operating temperature range, but due to the greater curvature, it may help speed up the airflow cooling.

Transmission distance: 10G AOC high-speed cable is longer than DAC high-speed cable

The 10G AOC high-speed cable uses optical fiber technology, and its maximum transmission distance is 100m, while the maximum transmission distance of the 10G DAC high-speed cable is 10m (passive DAC: 7m; active DAC: 10m). It should be noted that the maximum distance for information transmission through the DAC high-speed cable can vary with the data rate. When the speed increases, the transmission distance will shorten. For example, a 100G DAC high-speed cable can only transmit up to 5 meters. The limitation of transmission distance also reflects the common application of DAC high-speed cables: usually connecting devices located in the same rack, such as connecting servers to TOR switches. In short, DAC high-speed cables are suitable for short-distance transmission, while AOC high-speed cables are suitable for long-distance networking.

Cost: 10G DAC high-speed cable is lower than 10G AOC high-speed cable

In general, the price of 10G DAC high-speed cables is lower than 10G AOC high-speed cables, because 10G DAC high-speed cables have fewer internal components, relatively simple structure, and the use of copper wire is much cheaper than using optical fiber. In other words, when deploying a network in a large data center, choosing a large number of DAC high-speed cables will save more money than AOC high-speed cables. For short-distance transmission, 10G DAC high-speed cable does provide a more cost-effective solution than AOC high-speed cable, but for long-distance transmission, you need to compare the overall cost of the two solutions.


Typical application of 10G AOC high-speed cable

10G AOC high-speed cables are usually used in data centers, and there are applications in ToR, EoR and MoR. Similar to the DAC high-speed cable, the ToR switch between the network rack and the server rack can be connected through the 10G AOC high-speed cable, and the maximum transmission distance of the switch in the rack can be up to 100 meters.

For example, in EoR cabling, the server is connected to the switch through a 10G AOC high-speed cable, so that a large number of cable connections of multiple server cabinets converge into the edge network cabinet. Such cable management is more difficult, but centralized maintenance is more convenient. The solution of using AOC high-speed cable in MoR wiring is basically similar to the EoR solution, while simplifying the connection and centralized management.


Conclusion

In summary, when choosing a 10G network deployment plan, it is necessary to comprehensively consider factors such as application environment, wiring space, distance, power consumption, and budget. 10G DAC high-speed cables are suitable for short transmission distances, power consumption restrictions, and high cost requirements, while 10G AOC high-speed cables are more suitable for long-distance transmission environments such as data centers or environments with large electromagnetic interference. Cable.