Arista CAB-S-S-25G-2.5 | 25G SFP28 Passive Twinax DAC Cable, 2.5M, 25GBASE-CR

Q: What is the Arista CAB-S-S-25G-2.5 and what is it used for?
A: The CAB-S-S-25G-2.5 is a 2.5-metre passive 25GBASE-CR SFP28 to SFP28 direct attach twinax copper cable. It is designed for short-reach, high-density data centre cabling such as server-to-switch, top-of-rack, and inter-rack connections where low latency and cost efficiency are priorities.

Q: Is this cable compatible with ports other than 25G SFP?
A: Yes. In addition to standard 25G SFP ports, the CAB-S-S-25G-2.5 is also compatible with 50G SFP and 100G SFP-DD/DSFP ports, making it versatile across Arista's data centre switching and server platforms.

Q: Does this cable support 10G speeds?
A: Yes. The cable supports dual-rate 10G/25G operation on Arista 25G SFP platforms, providing backward compatibility for environments that include a mix of 10G and 25G equipment.

Q: What does 'passive' mean for this DAC cable and why does it matter?
A: A passive cable contains no active electronic components, relying solely on the copper twinax medium for signal transmission. This results in lower power consumption (max 0.57W per end), reduced heat generation, and lower latency compared to active DAC or optical alternatives — ideal for short-reach data centre links.

Q: Is Forward Error Correction (FEC) enabled on this cable?
A: No. FEC is disabled by default on Arista 25G DAC cables, including the CAB-S-S-25G-2.5. This is the standard configuration for passive copper DAC cables on Arista platforms. Ensure your switch and host port FEC settings are aligned accordingly.

Q: Can I purchase the Arista CAB-S-S-25G-2.5 in Australia from IP Trading?
A: Yes. IP Trading (iptrading.com.au) is an Australian B2B IT hardware reseller supplying genuine Arista cabling and connectivity products. Contact the team or order online for competitive pricing, fast local fulfilment, and reliable after-sales support.