• Silver-colored sfp+ transceiver modules with blue handles and metallic connectors on arista 40g qsfp+ to 4x 10g sfp+ breakout dac cable 0.5m
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Arista

Arista CAB-Q-S-0.5 | 40G QSFP+ to 4x 10G SFP+ Breakout DAC Cable, 0.5m

CAB-Q-S-0.5

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Description

The Arista CAB-Q-S-0.5 is a 40G passive direct attach copper breakout cable designed for high-density data center environments. This 0.5-meter twinax cable features a QSFP+ connector on one end and four SFP+ connectors on the other, enabling cost-effective 40G to 4x10G breakout connectivity. Ideal for short-range connections between switches, routers, and servers, it offers low latency and power consumption compared to fibre optic alternatives.

Features

Passive twinax copper construction for reliable short-distance connectivity
- QSFP+ to 4x SFP+ breakout design for flexible network topology
- Supports 40G Ethernet, InfiniBand, and Fibre Channel over Ethernet (FCoE) applications
- Low latency for high-performance computing and storage networks
- Hot-pluggable for easy installation and maintenance without downtime
- MSA compliant QSFP+ and SFP+ connectors ensure broad compatibility
- No external power required, reducing operational costs
- RoHS compliant and lead-free for environmental responsibility

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

Cable Type: 40GBASE-CU Passive Direct Attach Copper (DAC)
- Connector 1: 1x QSFP+ (40G)
- Connector 2: 4x SFP+ (10G each)
- Cable Length: 0.5 meters (50cm)
- Data Rate: Up to 40 Gbps aggregate (4x 10 Gbps)
- Cable Gauge: 30 AWG Twinax Copper
- Power Consumption: 0.5W maximum (passive)
- Operating Temperature: 0°C to 70°C
- Compliance: QSFP+ MSA SFF-8436, RoHS

FAQs

Q: What is the primary use case for this breakout cable?
A: This cable enables a single 40G QSFP+ port to connect to four separate 10G SFP+ ports, commonly used in data centers to break out high-speed uplinks to multiple access switches or servers, maximizing port utilization and reducing cost.

Q: Is this cable compatible with non-Arista equipment?
A: Yes, this passive DAC cable follows industry-standard QSFP+ and SFP+ MSA specifications and can work with switches and routers from multiple vendors including Cisco, Juniper, and others, provided the ports support 40G QSFP+ and 10G SFP+ standards.

Q: What are the advantages of DAC cables over fibre optics?
A: Passive DAC cables offer lower cost, zero power consumption (no active components), lower latency, and simpler installation for short-distance connections up to 5 meters. They are ideal for in-rack or adjacent-rack connections in data centers.

Q: Can I use this cable for 40G to 40G connections?
A: No, this is a breakout cable specifically designed to split one 40G QSFP+ port into four 10G SFP+ ports. For 40G to 40G connections, you would need a QSFP+ to QSFP+ DAC cable instead.

Q: What is the maximum distance supported?
A: This 0.5-meter cable is designed for very short-range connections within a rack or between adjacent racks. Passive copper DAC cables are typically available in lengths up to 5 meters for copper-based interconnects.

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