• Silver-colored arista H-D400-4Q100-1M sfp+ transceiver modules with blue handles and metallic connectors for 400g active DAC
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Arista

Arista CAB-Q-Q-2M-Arista | 40G QSFP+ Passive DAC Cable, 2m Twinax

CAB-Q-Q-2M-Arista

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Description

The Arista CAB-Q-Q-2M is a 40G passive direct attach copper cable designed for cost-effective short-range connectivity within data centres and equipment racks. This 2-meter QSFP+ to QSFP+ twinax cable delivers reliable 40 Gigabit Ethernet connections without requiring external power, making it ideal for high-density switch-to-switch interconnects. Compliant with IEEE 802.3ba and QSFP MSA standards, it provides a low-latency, energy-efficient alternative to optical transceivers.

Features

Passive copper construction eliminates need for external power
- Hot-pluggable QSFP+ form factor for easy installation and maintenance
- Low latency copper interconnect for high-performance applications
- Compliant with IEEE 802.3ba 40G Ethernet standard
- QSFP MSA (SFF-8436) compliant for multi-vendor interoperability
- Cost-effective alternative to optical transceiver modules
- Energy-efficient design reduces operational expenses
- Supports 40GBASE-CR4 and InfiniBand QDR applications
- RoHS compliant and lead-free construction
- High-quality twinax copper cable for reliable signal integrity
- Suitable for top-of-rack and in-row data centre connectivity
- 30AWG gauge provides flexibility for cable management

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

Connector Type: QSFP+ to QSFP+
- Cable Type: Passive Direct Attach Copper (DAC), Twinax
- Data Rate: 40 Gbps (40GBASE-CR4)
- Cable Length: 2 meters (6.6 feet)
- Cable Gauge: 30AWG
- Power Supply: Single 3.3V
- Power Consumption: Maximum 1.5W per end
- Operating Temperature: 0°C to 70°C
- Compliance: IEEE 802.3ba, QSFP MSA (SFF-8436), RoHS
- Form Factor: Hot-pluggable QSFP+
- Application: 40G Ethernet, InfiniBand QDR

FAQs

Q: What equipment is this cable compatible with?
A: The CAB-Q-Q-2M is designed for Arista switches with 40G QSFP+ ports, including the 7000 series platforms. It connects two QSFP+ ports for direct switch-to-switch or switch-to-server connectivity in data centre environments.

Q: What is the difference between passive DAC and active optical cables?
A: Passive DAC cables like the CAB-Q-Q-2M use copper twinax construction and require no external power, making them cost-effective for distances up to 3-5 meters. They consume less power than active optical cables and are ideal for in-rack or adjacent-rack connections.

Q: Can this cable be used for breakout connections?
A: No, the CAB-Q-Q-2M is a QSFP+ to QSFP+ direct cable providing a single 40G connection. For breakout applications splitting 40G into 4x10G connections, you would need the CAB-Q-S series cables instead.

Q: Does this cable work with 100G QSFP28 ports?
A: While physically compatible, this 40G QSFP+ cable is designed for 40GBASE-CR4 applications. For 100G connections, you should use dedicated 100G QSFP28 cables to ensure proper performance and compatibility.

Q: What are the advantages over using optical transceivers?
A: Passive DAC cables offer significantly lower cost, reduced power consumption (no transceivers needed), lower latency, and simplified deployment for short-distance connections. They're ideal for top-of-rack switching and in-row connectivity within data centres.

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