DAC high-frequency high-speed cables (DirectAttachCable) are generally translated as direct cables or direct-attached copper cables. They are usually purchased at fixed lengths and have fixed connectors at both ends. The ports cannot be replaced, and the module head and copper cables cannot be separated. Widely used in storage area networks, data centers, and high-performance computer connections. DAC high-speed cables consist of three components: IO interface (external IO, backplane), high-performance differential pair high-capacity cable, and high-density, low-profile IO connector system for near-chip or package mounting. External IO is typically industry-standard connector interfaces such as SFP, QSFP, QSFPDD, and OSFP, and can be configured in single-port, combo, or stacking frames. These connectors can be customized to include heat sinks and light pipes. High-speed differential pair cables can support 56G, 112G and expected 224G signaling speeds and can be customized to any length.
Using silver-plated conductors and foamed insulating core wires as materials, wire pair shielding and overall shielding are used to form a high-speed cable. High-speed cables have excellent attenuation performance, low delay and anti-interference, and can realize high-frequency broadband transmission. There are 30~24AWG specifications and various structures such as 2P, 4P or 8P, and can be used in many different applications. .
DAC high-frequency high-speed cable classification
1. 10G SFP+ to SFP+DAC,
The 10GSFP+ to SFP+DAC adopts a passive twinaxial cable assembly and is directly connected to the SFP+ module, which has the characteristics of high density, low power, low cost and low delay.
2. 40G QSFP+ to QSFP+DAC
40G QSFP+ to QSFP+DAC provides a very cost-effective way to establish 40G links between internal racks and cross-rack QSFP+ switch ports, so that the backbone link from the access layer uplink to the core is upgraded to 4OG/100G, With its high speed and low latency, it is widely used in high-speed backbone networks, enterprise network switching and network storage.
3. 40G QSFP+ to 4*SFP+DAC
One end of the QSFP+ to 4*SFP+DAC is a 40G QSFP+ interface, which meets the requirements of SFF-8436, and the other end is four 1OGSFP+ interfaces, which meets the requirements of SFF-8432. To meet the requirement of cable length, add a splitter in the middle of the MPO cable to realize one 40G optical signal is divided into four 10G signals, which is the most economical and simple way to realize switch port conversion.
4. 40G QSFP+ to 4*XFPDAC
One end of the 40GQSFP+ to 4*XFP+DAC is a 40GQSFP+ interface, and the other end is four 10GXFP interfaces. Since the XFP optical module does not have a DAC copper cable standard, the signal compensation of the equipment transmission is low, and the loss of the cable itself is very large, so it can only be used for short-distance transmission, generally within 2m, to realize the interconnection between 40GQSFP+ interface and XFP port .
5. 25G SFP28 to SFP28DAC
25GSFP28 to SFP28DAC can provide customers with 25G high-bandwidth data interconnection capabilities, conforms to IEEEEP802.3by Ethernet standard and SFF-8402SFP28, and is widely used in data center or supercomputing center system scenarios.
6. 100G QSFP28 to QSFP28DAC
100G QSFP28 to QSFP28DAC can provide customers with 100G high-bandwidth data interconnection capabilities, provide 4 duplex channels, each channel can support a working rate of 25Gb/s, and the aggregation bandwidth is 100Gb/s, which conforms to the SFF-8436 specification and is applied to QSFP28 ports connections between devices.
7. 100G QSFP28 to 4*SFP28DAC
One end of the 100GQSFP28 to 4SFP28DAC is a 100GQSFP28 interface, and the other end is four 25GSFP28 interfaces, which can provide customers with 100G high-bandwidth data interconnection capabilities, in line with SFF-8665/SFF-8679, IEEE802.3bj and InfinibandEDR standards, and are widely used in data Center or supercomputing center system scenarios.
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