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

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.