High-speed cables (Dielectically Attached Cables, DAC) are optical modules without lasers or electronic components, making them cost-effective and energy-efficient for short-distance applications.

The structure of high-speed cable

High-speed cables are constructed using silver-coated conductors and foam-insulated core wires, featuring both pair shielding and overall shielding. These cables deliver excellent attenuation performance, low latency, and strong interference resistance, enabling high-frequency broadband transmission. Available in 30-24 AWG specifications and multiple configurations including 2P,4P, or 8P, they are adaptable for diverse application scenarios.

assumption diagram

process flow

1. Since all conductors are single strands, their flexibility is inferior to stranded conductors, and they are difficult to recover after bending. Therefore, during wire processing, torsion and bending of insulated core wires should be avoided as much as possible, so as to prevent bending of conductors and affect performance.

2. The insulation is a foamed structure, and its mechanical properties are worse than solid insulation. When the insulation is compressed or stretched, it is easy to deform and destroy the foam layer structure. Therefore, during the processing, the insulation core wire should be avoided from being compressed or stretched as far as possible to avoid electrical influence on the performance.

3. The wire pairs are wound in parallel without twist pitch, resulting in poor bending performance. Therefore, during processing, avoid bending the wire pairs as much as possible to minimize damage to the winding structure.

4. To achieve optimal electrical performance, the cable pitch is relatively larger than that of standard wires, which reduces their flexibility. Therefore, during manufacturing, the bending radius should be maximized, ideally at least 20 times the outer diameter (OD) of the wire.

High-speed cable classification

1. 10G SFP+ to SFP+ DAC

2. 25G SFP28 to SFP28 DAC

3. 40G QSFP+ to QSFP+ DAC

4. 40G QSFP+ to 4XSFP+ DAC

5. 100G QSFP28 to QSFP28 DAC

6. 100G QSFP28 to 4xSFP28DAC