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Arista

Arista CAB-S-S-25G-2M-Arista | 25G SFP28 Passive DAC Cable, 2m

CAB-S-S-25G-2M-Arista

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Description

The Arista CAB-S-S-25G-2M is a 25GBase-CU passive direct attach copper (DAC) twinax cable designed for high-speed 25 Gigabit Ethernet connectivity between SFP28 ports. This 2-meter cable provides a cost-effective, low-latency solution for short-reach connections within data centre racks or between adjacent racks. Compliant with IEEE 802.3by, SFF-8402, and SFP28 MSA standards, it delivers reliable performance for modern switching infrastructure.

Features

Hot-pluggable SFP28 form factor for easy installation and replacement
- Passive copper construction for low power consumption and heat dissipation
- Low insertion loss and crosstalk for reliable signal integrity
- Support for 25G and backward compatibility with 10G operation
- EEPROM with product identification information readable by host systems
- MSA-compliant design ensures broad compatibility with SFP28 platforms
- Low electromagnetic interference (EMI) for clean signal transmission
- Cost-effective alternative to optical transceivers for short-reach applications
- Suitable for top-of-rack and leaf-spine data centre architectures
- Durable twinax cable construction for reliable rack-level connectivity

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: 25GBase-CU Passive Direct Attach Copper (DAC) Twinax
- Connector Type: SFP28 to SFP28
- Data Rate: 25 Gbps
- Cable Length: 2 meters (6.6 feet)
- Wire Gauge: 30 AWG
- Power Consumption: Max 0.57W per connector end
- Supply Voltage: 3.3V
- Compliance: IEEE 802.3by, SFF-8402, SFF-8432, SFP28 MSA SFF-8431
- Minimum Bend Radius: 21.25mm
- RoHS Compliant
- Supports dual-rate 10G/25G operation

FAQs

Q: What is the difference between passive and active DAC cables?
A: Passive DAC cables like the CAB-S-S-25G-2M use copper conductors without signal amplification, making them more power-efficient and cost-effective for shorter distances up to 5 meters. They consume less than 0.6W per end compared to active cables or optical transceivers, making them ideal for rack-to-rack connections in data centres.

Q: Is this cable compatible with 10G SFP+ ports?
A: Yes, the CAB-S-S-25G-2M supports dual-rate operation and can function at 10G speeds when connected to compatible 10G SFP+ ports on Arista switches, providing investment protection and flexible deployment options.

Q: Can I use this cable with non-Arista equipment?
A: While this cable is programmed for Arista Networks equipment, 25G SFP28 DAC cables are generally interoperable with other vendors' equipment that supports industry-standard SFP28 connectors and 25GBase-CU specifications. However, compatibility should be verified with the specific switch manufacturer.

Q: What is the maximum distance for 25G passive DAC cables?
A: Passive 25G SFP28 DAC cables are typically available in lengths up to 5 meters. For longer distances beyond 5 meters, active optical cables (AOCs) or fibre optic transceivers with appropriate cabling should be used.

Q: Does this cable require any special configuration?
A: No, the CAB-S-S-25G-2M is a plug-and-play solution with pre-programmed EEPROM that is automatically recognized by Arista switches. Simply insert the connectors into compatible SFP28 ports and the link will establish automatically.

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