Shulou(Shulou.com)06/01 Report--

Both 25G high-speed cable and 25G active optical cable can realize 25Gbps data transmission, but what is the difference between them? Yi Tianguang Communication will introduce 25G DAC and 25G AOC in detail in this article.

1. What is a 25g QSFP28 DAC high-speed cable:

25g high-speed cable adopts silver-plated conductor and foamed insulated core, which has excellent attenuation performance and low delay performance, which can not only make the signal transmission correct, but also improve the transmission speed. it is a short-distance connection solution instead of optical module. the price is much cheaper than the same type of optical module, and it is widely welcomed in short-distance connection applications.

25g SFP28 to SFP28 DAC is a very cost-effective solution for short-distance link transmission. It can establish 25G links through the SFP28 port of the switch, meets IEEE P802.3by and SFF-8402 SFP28 standards, and is widely used in data center or supercomputing center system scenarios.

two。 What is a 25g QSFP28 AOC active optical cable:

25g active optical cable can overcome the bandwidth limitation of traditional high-speed cable, and this 25G active optical cable can provide an ideal alternative solution for high-speed cable and short-distance SFP28 optical module, with more complete signal and higher performance. therefore, it is widely used in high-speed, high-density and low-power data center networks.

There is only one type of 25G AOC active optical cable: 25G SFP28 AOC. 25g SFP28 AOC can travel up to 70m with OM3 multimode fiber and 100m with OM4 multimode fiber. It is suitable for short-range data communications and interconnection applications and provides a cost-effective way to connect racks and adjacent racks.

3. Comparison of the advantages of 25G high-speed cable and 25G active optical cable:

25g high-speed cables can support data rates up to 25Gbps, which is higher than that supported by traditional copper cables; 25G active fiber cables are suitable for 25G and 10G Ethernet, high-capacity IO and SFP+ interfaces, data center and rack-to-rack connections.

The volume and weight of 25G active optical cable are 1/2 and 1/4 of 25g high-speed cable, respectively, so 25g active optical cable is much lighter than 25G high-speed cable; 25g active optical cable has high throughput up to 25Gbps without equipment upgrade; 25g active optical cable also has better transmission performance and bit error rate, and the transmission power of 25g active optical cable is lower on the system link when the BER can reach 10-15x.

4. The structure of 25g DAC high-speed cable and 25g AOC active optical cable:

The 25G high-speed cable consists of a copper cable and optical fiber transceiver devices at both ends. The connector used is similar to the interface of the optical module, but the connector module above the high-speed cable does not have expensive lasers. As a result, the cost of short-distance applications is greatly reduced.

25g active optical cable consists of optical fiber transceivers at both ends and OM3 or OM4 multimode fibers of different lengths. The transceivers at both ends can provide photoelectric conversion and optical transmission functions, which ensure the stability of data transmission and the flexibility of applications.

5. Application of 25g DAC high-speed cable and 25G AOC active optical cable:

25G high-speed cables are mainly used in switches / routers / HBA, servers and data storage devices, Ethernet of 40Gbs/100GBS, and fibre Channel.

25g active optical cable is suitable for 25G and 10G Ethernet, high-capacity IO and SFP+ interfaces, data center and rack-to-rack connections.

Yi Tianguang communication 25G direct connection cable can meet the needs of users for 25G network construction. Generally speaking, the selection of SFP28 DAC/AOC cable in the short-distance link of 25G network has the advantage of high performance-to-price ratio.

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