• Arista 100G QSFP28 to 4x SFP28 DAC twinax cable, 2m black with green connectors
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Arista

Arista CAB-Q-4S-100G-5M | 100G QSFP28 to 4x25G SFP28 DAC Breakout Cable, 5m

CAB-Q-4S-100G-5M

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Description

This passive twinax copper breakout cable connects one 100G QSFP28 port to four 25G SFP28 ports over a 5 metre length. It carries 100GBASE-CR4 on the QSFP end and 25GBASE-CR on each SFP28 leg, making it a cost-effective choice for short-reach top-of-rack links between 100G switch ports and 25G servers or switches. It suits data centre migrations from 25G to 100G where a single high-density port needs to fan out to multiple 25G devices.

Enquire with XS Network Tech for new or used pricing and availability.

Features

- Cost-effective 100G-to-4x25G breakout for migrating from 25G to 100G
- Passive twinax copper construction for short-reach top-of-rack links
- Supported on Arista QSFP 100G ports
- Port speed is set to 25G per lane with 'speed forced 25gfull' on the breakout interfaces
- On 7050X3 and 7260X3 platforms, auto-negotiation and FEC are disabled by default on the 25G breakout ports

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

- Connector A: 100G QSFP28
- Connector B: 4 x 25G SFP28
- Standards: 100GBASE-CR4 to 4 x 25GBASE-CR
- Cable type: passive twinax copper DAC
- Length: 5 metres
- Four parallel bi-directional channels at 25Gbps each

FAQs

Q: What does this cable connect?
A: It connects one 100G QSFP28 port on one end to four separate 25G SFP28 ports on the other end, splitting the 100G port into four 25G links.

Q: Is this an active or passive cable?
A: It is a passive twinax copper DAC, so it has no powered electronics in the connectors and suits short-reach connections within or between adjacent racks.

Q: Does the breakout interface need any configuration?
A: On Arista platforms the breakout interfaces are set to 25G per lane using 'speed forced 25gfull'. On 7050X3 and 7260X3 platforms, auto-negotiation and FEC are disabled by default on the 25G breakout ports.

Q: What is the length of this cable?
A: This SKU is the 5 metre version. The same breakout cable is also offered in other lengths, so check the length before ordering for your rack layout.

Q: What Ethernet standards does it support?
A: The QSFP28 end carries 100GBASE-CR4, and each of the four SFP28 legs carries 25GBASE-CR at 25Gbps.

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