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Arista

Arista CAB-S-S-25G-2.5M-Arista | 25G SFP28 Passive DAC Cable, 2.5m Twinax, 30AWG

CAB-S-S-25G-2.5M-Arista

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Description

The Arista CAB-S-S-25G-2.5M is a 2.5-meter 25G SFP28 passive direct attach copper twinax cable designed for high-speed data centre connectivity. Compliant with IEEE 802.3by and SFP28 MSA standards, this cost-effective cable supports 25GBASE Ethernet and delivers reliable performance for short-range connections within racks or between adjacent racks. Ideal for enterprise networks requiring low-latency, high-throughput connectivity in space-constrained environments.

Features

Hot-pluggable SFP28 form factor for easy installation and replacement
- Low power consumption design (max 0.5W per end) reduces operational costs
- Passive copper construction eliminates need for external power
- IEEE 802.3by compliant for standards-based 25GBASE Ethernet operation
- SFP28 MSA compliant (SFF-8402) ensuring broad interoperability
- Backward compatible with 10G SFP+ applications
- Integrated EEPROM provides digital diagnostic monitoring (DDM) capability
- 30 AWG twinax cable construction for flexibility and durability
- Cost-effective alternative to optical transceivers for short-reach connections
- Suitable for high-density data centre deployments
- Low-latency connectivity ideal for storage, compute, and network applications
- Commercial temperature range (0°C to 70°C) for standard networking environments

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: 25G SFP28 Passive Direct Attach Copper (DAC) Twinax
- Cable Length: 2.5 meters (8 feet)
- Connector Type: SFP28 to SFP28
- Data Rate: Up to 25 Gbps (supports 25G, 10G)
- Wire Gauge: 30 AWG
- Standards Compliance: IEEE 802.3by, SFP28 MSA (SFF-8402)
- Cable Classification: CA-S (Standard loss per IEEE 802.3by)
- Power Consumption: Max 0.5W per connector
- Supply Voltage: 3.3V
- Temperature Range: 0°C to 70°C (commercial)
- EEPROM: Integrated for host system identification
- Minimum Bend Radius: 21.25mm
- Certifications: CE, RoHS compliant

FAQs

Q: Is this cable compatible with 10G SFP+ ports?
A: Yes, the CAB-S-S-25G-2.5M supports both 25G and 10G operation. When used in 10G SFP+ ports, the cable will auto-negotiate to 10G speeds, providing flexible deployment options across mixed 10G/25G environments.

Q: Can this cable be used with non-Arista networking equipment?
A: While this cable is designed and coded for Arista platforms, third-party compatible versions are available that work with Cisco, Juniper, Dell, and other vendors. For multi-vendor environments, ensure you source cables with appropriate EEPROM coding for your specific switch platforms.

Q: What is the maximum distance for 25G passive DAC cables?
A: Passive copper DAC cables for 25G applications are typically available in lengths up to 5 meters. For distances beyond 5 meters, consider active optical cables (AOCs) or fiber optic transceivers, which support extended reach while maintaining 25G performance.

Q: Does this cable require Forward Error Correction (FEC)?
A: The CAB-S-S-25G-2.5M is a CA-S classification cable under IEEE 802.3by, which has specific FEC requirements. The cable is designed to work with Arista switches that automatically configure the appropriate FEC settings for optimal signal integrity at 25G speeds.

Q: What are the typical use cases for this cable length?
A: The 2.5-meter length is ideal for top-of-rack connections, switch-to-server links within the same cabinet, or connections between adjacent racks in a data centre. This length provides flexibility for cable management while minimizing signal loss compared to longer cables.

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