• Silver-colored Arista 100G QSFP28 DAC transceiver modules with blue handles and metallic connectors for twinax copper cable
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Arista

Arista CAB-Q-Q-100G-0.5 | 100G QSFP28 DAC Twinax Copper Cable, 0.5m, Passive

Arista CAB-Q-Q-100G-0.5 | 100G QSFP28 DAC Twinax Copper Cable, 0.5m, Passive

CAB-Q-Q-100G-0.5

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Description

The Arista CAB-Q-Q-100G-0.5 is a passive 100GBASE-CR4 QSFP28 to QSFP28 Direct Attach Copper (DAC) Twinax cable engineered for ultra-short 100 Gigabit Ethernet interconnects within data centre racks. Delivering 103.125 Gbps aggregate throughput across four independent 25 Gbps NRZ lanes, this 0.5-metre cable is the ideal cost-effective choice for top-of-rack and rack-to-rack spine-leaf connections where optical transceivers would be overkill. With a passive design consuming just 0.5W and full hot-plug support, it minimises operational overhead while maximising port density.

Fully compliant with the QSFP28 MSA, IEEE 802.3bj, and CAUI-4 standards, the CAB-Q-Q-100G-0.5 integrates seamlessly with Arista EOS from release 4.15.2 onwards. It also supports breakout to 4 x 25G with appropriate configuration, adding deployment flexibility. RoHS compliant and built to 30 AWG twin-axial copper, this cable is backed by Arista's 1-Year Limited Hardware Warranty. Visit iptrading.com.au to secure your order — enterprise-grade hardware with expert support.

Features

- Passive design requires no signal amplification — ultra-low 0.5W power draw
- Hot-pluggable QSFP28 form factor for fast, tool-free installation and serviceability
- Four independent duplex 25 Gbps NRZ channels deliver full 100G aggregate bandwidth
- Cost-effective alternative to optical transceivers for sub-1-metre rack interconnects
- Supports breakout to 4 x 25G with appropriate switch configuration
- Also capable of 40G operation for legacy infrastructure compatibility
- Native Arista EOS support from release 4.15.2 onwards — plug-and-play on Arista platforms
- MSA memory map accessible via TWI/I2C management interface
- RoHS compliant for environmentally responsible data centre deployments

Warranty

Arista hardware products come with a 1-year limited hardware warranty, covering defects in materials and workmanship under normal use.
Extended Warranty Options:
IP Trading offers tailored extended warranty solutions and support packages for Arista products. Contact our team to explore options that align with your organisation's needs.
https://www.arista.com/assets/data/pdf/Warranty.pdf

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

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Technical Specifications

FAQs

Datasheet

Technical Specifications

- Standard: 100GBASE-CR4 (IEEE 802.3bj) / CAUI-4
- Form Factor: QSFP28 to QSFP28 (both ends)
- Cable Type: Passive Twinax Copper Direct Attach (DAC)
- Cable Length: 0.5 metre (1.64 ft)
- Aggregate Data Rate: 103.125 Gbps (4 x 25.78125 Gbps NRZ lanes)
- Wire Gauge: 30 AWG
- Connector: MSA-compliant 38-pin edge type (both ends)
- Management Interface: 2-wire TWI/I2C (MSA memory map)
- Maximum Power Consumption: 0.5W
- Operating Temperature: 0°C to +70°C
- Hot-Pluggable: Yes
- Compliance: QSFP28 MSA, IEEE 802.3bj, CAUI-4, RoHS

FAQs

Q: What is the maximum reach of the CAB-Q-Q-100G-0.5?
A: This cable is designed for 0.5-metre (approximately 1.64 ft) connections, making it ideal for within-rack or immediately adjacent rack interconnects. For longer distances, consider Arista's active DAC, AOC, or optical transceiver options.

Q: Is this cable compatible with non-Arista switches?
A: The CAB-Q-Q-100G-0.5 is MSA-compliant (QSFP28 MSA, IEEE 802.3bj), so it is physically compatible with any QSFP28 port. However, Arista codes this cable specifically for Arista EOS platforms (supported from EOS 4.15.2+). Compatibility with third-party switches may vary and is not guaranteed.

Q: Can this 100G cable be used for 4 x 25G breakout?
A: Yes. With appropriate breakout cable or switch configuration, the four independent 25 Gbps NRZ lanes can be used for 4 x 25G connectivity, providing additional flexibility in spine-leaf or top-of-rack deployments.

Q: Does this cable require any special power or cooling?
A: No. The passive design consumes a maximum of just 0.5W and generates minimal heat, requiring no active cooling or additional power beyond what the host QSFP28 port provides. This makes it an extremely energy-efficient interconnect option.

Q: Can I purchase the Arista CAB-Q-Q-100G-0.5 in Australia through IP Trading?
A: Yes. IP Trading (iptrading.com.au) is an Australian B2B IT hardware reseller offering the Arista CAB-Q-Q-100G-0.5 with expert pre-sales support and fast local fulfilment. Contact the team at iptrading.com.au for pricing, stock availability, and volume enquiries.

Q: What warranty is included with this cable?
A: Arista provides a 1-Year Limited Hardware Warranty with a 10 business day turnaround. Optional upgrade support including Next Business Day and 4-Hour Advance Hardware Replacement is also available for environments requiring faster response times.

Datasheet

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