• Juniper Compatible 40G QSFP to QSFP Copper DAC Cable, 1-5M
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Blue Cable Co

QFX-QSFP-DAC-xM-BCC | Juniper Compatible QSFP to QSFP Copper DAC Cable, 40GB, 40GBASE-CR4 | 1 to 5M

QFX-QSFP-DAC-1M-BCC

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$93.50 inc. GST
$85.00 ex. GST
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Description

The QFX-QSFP-DAC-xM-BCC is a drop-in compatible replacement for the Juniper QFX-QSFP-DAC-1M passive copper direct attach cable. This cable operates plug-and-play in Juniper QFX and EX series switches with QSFP+ ports, delivering 40 Gigabit Ethernet connectivity over passive twinax copper. - Compliant with IEEE 802.3ba 40GBASE-CR4 and QSFP+ MSA SFF-8436, guaranteeing interoperability with standards-compliant QSFP+ ports - QSFP+ to QSFP+ form factor with 30 AWG twinax copper, 40 Gbps aggregate data rate across four lanes - Passive copper design with no external power required, low latency, and cost-effective alternative to fibre optics - Hot-swappable with QSFP+ connectors, suitable for intra-rack and adjacent rack connections up to 5 metres - Available in 1m, 3m, and 5m lengths to suit different rack configurations - Tested in Sydney, Australia for compatibility and performance with Juniper platforms

Features

• IEEE 802.3ba 40GBASE-CR4 compliance ensures interoperability with any standards-compliant QSFP+ port, not just Juniper platforms, enabling flexible multi-vendor deployments
• Four-lane architecture operating at 10.3125 Gbps per lane delivers 40 Gbps aggregate throughput with lower per-lane signal integrity demands compared to single-lane 40G designs
• Passive copper construction eliminates the need for signal conditioning circuitry, resulting in zero power draw beyond the host interface, minimal heat generation, and sub-microsecond latency
• QSFP+ MSA SFF-8436 compliance guarantees mechanical fit, electrical interface, and I2C management compatibility with host devices implementing the multi-source agreement specification
• Hot-swap capability allows insertion and removal without powering down the host switch, supporting live network maintenance and phased infrastructure rollouts
• Three fixed-length options (1m, 3m, 5m) cover typical top-of-rack to mid-rack distances, with passive copper suitable for all lengths without active signal regeneration
• 30 AWG twinax cable gauge balances mechanical flexibility for tight bend radii in high-density racks with low DC resistance for passive signal integrity at 40 Gbps over the maximum 5-metre reach

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

Also Known As

FAQs

Compatible SFP Selector

Technical Specifications

Brand: Blue Cable Co
BCC SKU: QFX-QSFP-DAC-xM-BCC
Compatible Replacement For: QFX-QSFP-DAC-1M
Compatibility: Juniper compatible
Lab Testing: Tested in Sydney, Australia
Warranty: 5-year advanced hardware replacement (Blue Cable Co)
Form Factor: QSFP+ to QSFP+ direct attach copper cable
Data Rate: 40 Gbps (4 x 10.3125 Gbps lanes)
Cable Type: Passive twinax copper
Wire Gauge: 30 AWG
Connector Type: QSFP+ (both ends)
Standards: IEEE 802.3ba 40GBASE-CR4, QSFP+ MSA SFF-8436
Available Lengths: 1m, 3m, 5m
Operating Temperature: 0 to 70°C (commercial)
Hot-Swappable: Yes

Also Known As

740-038623, 740-038624, 740-038625

FAQs

Q: Will this work in place of the Juniper QFX-QSFP-DAC-1M?
A: Yes. The QFX-QSFP-DAC-xM-BCC is designed to replace the Juniper QFX-QSFP-DAC-1M and related length variants. It shares the same QSFP+ form factor, 40GBASE-CR4 standard compliance, and 40 Gbps data rate, ensuring plug-and-play compatibility. The cable is programmed to meet Juniper platform requirements and operates identically to the OEM part in QFX and EX series switches with QSFP+ ports.

Q: Which Juniper platforms support this cable?
A: This cable is compatible with Juniper switches and routers featuring QSFP+ ports that support 40GBASE-CR4. While specific platform compatibility depends on the port specifications, any Juniper device with standard QSFP+ 40G Ethernet ports adhering to IEEE 802.3ba and QSFP+ MSA SFF-8436 will support this cable. Verify that your target platform lists 40GBASE-CR4 or QSFP+ DAC compatibility in its hardware documentation.

Q: What is the maximum distance for passive copper at 40 Gbps?
A: Passive copper DAC cables like this one are limited to 5 metres maximum reach at 40 Gbps due to signal attenuation and insertion loss in copper twinax. Beyond 5 metres, the signal degrades below the receiver sensitivity threshold required for 40GBASE-CR4 without active signal regeneration. For distances beyond 5 metres, consider active copper (up to 10m) or fibre optic transceivers with appropriate fibre patch cables.

Q: Can I mix cable lengths within the same switch?
A: Yes. Each QSFP+ port operates independently, so you can use different cable lengths (1m, 3m, 5m) across ports within the same switch without issues. The passive design has no inter-port dependencies, and the 40GBASE-CR4 standard defines fixed electrical characteristics regardless of cable length within the 5-metre passive limit. Lane timing and signal integrity are maintained per-port, allowing arbitrary length combinations across your rack topology.

Q: Does this cable support FEC or require host-side FEC configuration?
A: The 40GBASE-CR4 standard (IEEE 802.3ba Clause 85) does not mandate forward error correction for copper DAC links under 5 metres. Most switches auto-negotiate link parameters and do not require manual FEC enablement for passive DAC connections at this distance. However, some platforms may enable FEC by default for all 40G links. Check your switch configuration if link errors occur, though passive copper under 5m typically establishes error-free links without FEC intervention.

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Fully tested. No brand-tax. Sydney re-coding available if required.

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100% compatible with equipment from major vendors

Coded and tested in our state of the art lab in Sydney

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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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