• Arista Compatible 100G QSFP to 4x25G SFP28 Breakout DAC, 1-5M
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Blue Cable Co

CAB-Q-4S-100G-xM-BCC | Arista Compatible 100GB QSFP to 4 x 25GB SFP25G Direct Attach Breakout Cable | 1M to 5M

CAB-Q-4S-100G-1M-BCC

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$251.90 inc. GST
$229.00 ex. GST
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Description

The CAB-Q-4S-100G-xM-BCC is a drop-in compatible replacement for the Arista CAB-Q-4S-100G-1M. This passive twinax copper breakout cable connects a 100G QSFP28 port to four 25G SFP28 ports and is plug-and-play compatible with Arista switches. - Complies with IEEE 802.3bj 100GBASE-CR4, SFF-8665, and SFF-8402, guaranteeing interoperability with standards-compliant equipment - 100G QSFP28 connector on one end, four independent 25G SFP28 connectors on the other, supporting 25.78 Gbps per lane - Passive copper twinax construction for reliable short-reach connectivity without external power - Available in 1M, 2M, 3M, and 5M lengths to suit rack and adjacent-rack configurations - Hot-swappable design for field installation without network interruption - Suitable for data centre top-of-rack aggregation, server connectivity, and high-density 25G breakout applications

Features

• IEEE 802.3bj 100GBASE-CR4 compliance ensures full electrical and signal integrity interoperability with equipment following the same standard, enabling mixed-vendor deployments without protocol negotiation issues
• Four electrically independent 25G lanes allow each SFP28 port to connect to a separate downstream device, enabling flexible fan-out topologies from a single 100G uplink
• Passive copper signal path eliminates active electronics and external power requirements, reducing per-port power consumption and thermal load in high-density aggregation switches
• Hot-swappable QSFP28 and SFP28 connectors support insertion and removal under power without disrupting adjacent ports or requiring host reboot, simplifying maintenance and incremental build-out
• Twinax shielded construction maintains signal quality over the full rated distance with low insertion loss and minimal crosstalk between lanes, meeting IEEE channel specifications for 100GBASE-CR4
• Suitable for intra-rack and adjacent-rack deployments where 100G switch ports need to break out to four 25G server NICs, storage arrays, or spine uplinks without the cost or complexity of optical transceivers

Warranty

5-Year Advanced Warranty on All Blue Cable Co® Products

Blue Cable Co® offers a comprehensive 5-Year Advanced Warranty on all our branded products. Our advanced warranty ensures fast, hassle-free replacements to keep your network running smoothly. If a fault occurs, we’ll deliver a replacement part before you return the faulty item—minimising downtime and giving you complete peace of mind.

Choose Blue Cable Co® for reliable, high-quality network components backed by industry-leading warranty support.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Compatible SFP Selector

Technical Specifications

Brand: Blue Cable Co
BCC SKU: CAB-Q-4S-100G-xM-BCC
Compatible Replacement For: CAB-Q-4S-100G-1M
Compatibility: Arista compatible
Lab Testing: Tested in Sydney, Australia
Warranty: 5-year advanced hardware replacement (Blue Cable Co)
Form Factor: QSFP28 to 4x SFP28
Data Rate: 100 Gbps aggregate (4 x 25.78 Gbps per lane)
Cable Type: Passive twinax copper direct attach
Connector Type: QSFP28 (one end), 4x SFP28 (four ends)
Standards: IEEE 802.3bj 100GBASE-CR4, SFF-8665, SFF-8402
Available Lengths: 1M, 2M, 3M, 5M
Operating Temperature: 0 to 70°C (commercial)
Power Supply: 3.3V
Cable Gauge: 30AWG

FAQs

Q: Will this work in place of the Arista CAB-Q-4S-100G-1M?
A: Yes. This cable is designed as a plug-and-play replacement for the Arista CAB-Q-4S-100G-1M and meets IEEE 802.3bj 100GBASE-CR4, SFF-8665, and SFF-8402 standards. It provides the same 100G QSFP28 to 4x 25G SFP28 breakout function with identical electrical performance and form factor.

Q: Which Arista platforms support this breakout cable?
A: This cable is compatible with any Arista switch or device featuring 100G QSFP28 ports that support breakout mode to 4x 25G operation. The host platform must support IEEE 802.3bj 100GBASE-CR4 and be configured to split the QSFP28 port into four independent 25G interfaces.

Q: Can I connect each of the four SFP28 ends to different devices independently?
A: Yes. Each of the four 25G SFP28 connectors operates as an electrically independent lane with its own data path. They can connect to four separate devices simultaneously, provided the host switch is configured for 4x25G breakout mode on the QSFP28 port.

Q: Do I need to enable Forward Error Correction (FEC) on the host switch?
A: 100GBASE-CR4 supports both Fire-Code FEC (clause 74) and Reed-Solomon FEC (clause 91) as defined in IEEE 802.3bj. FEC is typically optional for passive copper cables under 5 meters but may improve link stability in electrically noisy environments. Check your switch documentation for FEC configuration guidance.

Q: What is the maximum reliable cable length for passive copper breakout cables?
A: Passive twinax copper cables are specified by IEEE 802.3bj for distances up to 5 meters over 100GBASE-CR4. Beyond 3 meters, signal attenuation increases and link performance may vary depending on cable gauge, bend radius, and host receiver sensitivity. For longer distances, consider active copper or active optical breakout cables.

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Tested on real vendor hardware in Sydney

Every Blue Cable Co transceiver is coded for your platform and tested in our Sydney test rack on real vendor switches and firewalls before it ships. We check it is recognised and links up the same way the OEM optic does, so you don't find an "unsupported transceiver" error after it's installed.

Brands tested: Cisco, Meraki, Arista, Aruba, HPE, Juniper, Dell, Fortinet, Palo Alto, Check Point, Sophos, Moxa and NVIDIA. Speeds up to 100Gb.

  • 5 year replacement warranty
  • Sydney stock
  • Re-coding if you need it

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