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Arista

Arista CAB-Q-Q-100G-2.5-Arista | 100G QSFP28 Passive DAC Cable, 2.5m Twinax

CAB-Q-Q-100G-2.5-Arista

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Description

The Arista CAB-Q-Q-100G-2.5 is a 2.5-meter passive direct attach copper twinax cable with QSFP28 connectors on both ends, designed for cost-effective 100G Ethernet connectivity within data centers and telecom equipment rooms. This passive cable assembly supports data rates up to 103.1 Gbps and is ideal for short-reach connections between switches, routers, and other networking equipment. Compliant with IEEE 802.3ba, QSFP28 MSA SFF-8665, and CE/RoHS certified, it provides reliable, low-latency performance without requiring external power.

Features

100GBASE-CR4 compliant for 100 Gigabit Ethernet applications
- Passive copper twinax design with no signal amplification required
- Low power consumption: maximum 1.5W per connector end
- Hot-pluggable QSFP28 form factor for easy installation and maintenance
- Compliant with QSFP28 MSA SFF-8665 industry standards
- IEEE 802.3ba compliant for 100G Ethernet over copper
- CE and RoHS certified for environmental and safety compliance
- High-quality copper twinax cable for low insertion loss and ultra-low crosstalk
- Cost-effective alternative to optical transceivers for short-reach connections
- Pre-coded EEPROM for seamless compatibility with Arista networking platforms
- Operating temperature range: 0°C to 70°C for data center environments
- Bit error rate of 10^-12 or better for reliable data transmission
- 3.3V supply voltage standard across QSFP28 platforms
- Ideal for high-density 100G switch interconnects and spine-leaf architectures

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

Cable Type: Passive Direct Attach Copper (DAC) Twinax
- Connector Type: QSFP28 to QSFP28
- Cable Length: 2.5 meters
- Data Rate: 100 Gbps (100GBASE-CR4)
- Bit Error Rate: 10^-12 or better
- Wire Gauge: 28 AWG (typical for 2.5m length)
- Power Consumption: Max 1.5W per end
- Supply Voltage: 3.3V
- Operating Temperature: 0°C to 70°C (case temperature)
- Storage Temperature: -40°C to 85°C
- Compliance Standards: IEEE 802.3ba, QSFP28 MSA SFF-8665, CE/RoHS
- Form Factor: Hot-pluggable QSFP28
- Maximum Operating Distance: 2.5 meters

FAQs

Q: What is the difference between passive and active DAC cables?
A: Passive DAC cables like the CAB-Q-Q-100G-2.5 have no signal amplification and consume minimal power (typically under 1.5W per end), making them ideal for short-reach connections up to 5 meters. They are more cost-effective than active cables and do not require external power for signal processing.

Q: Is this cable compatible with other vendor equipment?
A: This cable is designed and coded for Arista switches and routers with QSFP28 ports. While physically compatible with standard QSFP28 interfaces, the EEPROM encoding is optimized for Arista platforms. Cross-vendor compatibility may require recoding or vendor-specific variants.

Q: What applications is this cable best suited for?
A: The 2.5m length is ideal for intra-rack and adjacent-rack connections in data centers, high-performance computing clusters, and telecom equipment rooms where 100G connectivity is required over short distances. It provides a cost-effective alternative to optical transceivers for these applications.

Q: Does this cable support breakout configurations?
A: No, this is a QSFP28-to-QSFP28 cable providing a single 100G link. For breakout applications (e.g., 100G to 4x25G), you would need Arista's CAB-Q-4S-100G series cables which have QSFP28 on one end and four SFP28 connectors on the other.

Q: What is the expected lifespan and warranty?
A: Passive copper DAC cables typically support 250+ insertion cycles and have excellent reliability due to their simple passive design. Warranty coverage varies by supplier but typically includes manufacturer defects. The cable meets hot-pluggable specifications for operational flexibility.

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