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DAC High-Speed ​​Cable Classification

ODN and passive infrastructure knowledge brief Published 11 Nov 2023

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

DAC (Direct Attach Copper) cables come in passive and active forms, supporting speeds from 10Gbps to 100Gbps with SFP+, QSFP+, and breakout configurations.Main Categories of DAC Cables

1. Passive DAC Cables Passive DAC cables are simple twinax copper cables without any active electronics. They rely solely on the copper wiring to transmit data, making them cost-effective, energy-efficient, and low-latency. They are typically used for short distances, usually up to 5–7 meters, and are ideal for rack-to-rack or top-of-rack switch-to-server connections in data centers . 2. Active DAC Cables Active DAC cables include signal conditioning electronics such as amplifiers and equalizers. These components extend the effective range of the cable, allowing reliable connections up to 10–15 meters or more. Active DACs are more expensive but provide better signal integrity and are suitable for environments with higher crosstalk or electromagnetic interference .

Speed-Based Variants
  • 10G DAC Cables: Commonly used for 10 Gigabit Ethernet connections, available in both passive and active forms. Ideal for short-range connections within a rack or between adjacent racks .
  • 25G DAC Cables: Support 25Gbps data transfer, often used in modern high-performance data centers.
  • 40G DAC Cables: Typically use QSFP+ connectors and can be passive or active. They are suitable for switch-to-switch or switch-to-server connections over short distances .
  • 100G DAC Cables: Designed for ultra-high-speed networking, supporting massive data transfers in large-scale data centers. Available in both passive and active variants .
Connector and Configuration Types
  • SFP+ to SFP+: Standard 10G connections, often used within a single rack.
  • QSFP+ to QSFP+: Supports 40G connections, commonly used for high-speed switch interconnects .
  • Breakout Cables: Convert a single high-speed port into multiple lower-speed ports, e.g., a QSFP+ (40G) to four SFP+ (10G) ports. This allows splitting bandwidth efficiently without additional hardware .
  • Mixed Transceiver Cables: Some DACs connect devices with different transceiver types, such as SFP28 (25G) to SFP34 (40G), providing flexible high-speed connectivity .
Summary

DAC cables are high-speed, short-range copper solutions that simplify network deployment by integrating transceivers into the cable ends. Choosing between passive and active, selecting the appropriate speed, and considering connector type are key factors for optimizing data center performance and cost-efficiency .

DAC High-Speed ​​Cable Classification - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

DAC High-Speed ​​Cable Classification

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Related Video Reference

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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