• Silver-colored arista 25g sfp28 passive dac cable with blue plastic handles and metallic connectors 0.5m length
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Arista

Arista CAB-S-S-25G-0.5 | 25G SFP28 Passive DAC Cable, 0.5m

CAB-S-S-25G-0.5

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Description

The Arista CAB-S-S-25G-0.5 is a 25G SFP28 passive direct attach copper twinax cable designed for high-speed, cost-effective connectivity within racks or between adjacent racks in data centres. This 0.5-metre cable supports 25GBASE-CR Ethernet and is fully compliant with IEEE 802.3by standards and SFP28 MSA specifications. It offers plug-and-play installation with low power consumption, making it ideal for short-distance interconnects in enterprise and data centre environments.

Features

Passive copper twinax construction for low power consumption and cost efficiency
- Hot-pluggable SFP28 form factor for easy installation and removal
- Supports 25G Ethernet (25GBASE-CR) and backward compatible with 10G
- Compliant with IEEE 802.3by and SFP28 MSA (SFF-8402) industry standards
- Integrated EEPROM in SFP28 connectors for host system identification
- RoHS compliant and environmentally friendly
- Suitable for high-density data centre and enterprise networking environments
- Commercial operating temperature range (0°C to 70°C)
- No external power supply required—powered directly from host device
- Latency-optimized design for real-time and high-performance applications

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
- Data Rate: Up to 25 Gbps (25GBASE-CR), also supports 10G operation
- Cable Length: 0.5 metres (1.6 feet)
- Connector Type: SFP28 to SFP28
- Wire Gauge: Typically 26-30 AWG for 0.5m length
- Power Consumption: Less than 0.5W per connector (typical for passive cables)
- Operating Temperature: 0°C to 70°C (commercial grade)
- Compliance: IEEE 802.3by, SFP28 MSA (SFF-8402), RoHS compliant
- Supply Voltage: 3.3V
- Form Factor: Passive copper twinax assembly with integrated SFP28 connectors

FAQs

Q: What is the maximum data rate supported by the CAB-S-S-25G-0.5?
A: The cable supports data rates up to 25 Gbps for 25G Ethernet applications. It is also backward compatible with 10G Ethernet, making it suitable for dual-rate 10G/25G deployments.

Q: Is this cable compatible with non-Arista equipment?
A: Yes, as a passive copper cable compliant with IEEE 802.3by and SFP28 MSA standards, it can interoperate with other vendors' equipment that supports 25G SFP28 interfaces, provided the host devices recognize standard SFP28 DAC cables.

Q: What are the typical use cases for a 0.5m DAC cable?
A: This short 0.5-metre cable is ideal for very short-reach connections within the same rack, such as top-of-rack switch to server connections, switch-to-switch stacking, or high-density patch panel interconnects where space is limited.

Q: Does this cable require Forward Error Correction (FEC)?
A: Passive copper DAC cables at 0.5m length typically do not require FEC due to the very short distance and low signal loss. FEC requirements are generally associated with longer cable lengths or optical transceivers.

Q: What is the power consumption compared to optical transceivers?
A: Passive DAC cables consume significantly less power than optical transceivers—typically less than 0.5W per end compared to 1-2W for optical SFP28 modules. This makes DAC cables a more energy-efficient and cost-effective solution for short-distance connections.

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