40G QSFP DAC Cable, 0.5M (1.64ft) Passive Direct Attach Copper Twinax 40gb QSFP+ to QSFP+ Cable Compatible with Cisco QSFP-H40G-CU50CM
Details
- BrandQSFPTEK
- Connector TypeRJ45
- Cable TypeEthernet
- Compatible DevicesPC
- Special FeatureData Transfer
Description
⚡ Connect faster, last longer — the 40G cable that means business.
- COMPACT FLEXIBLE - 0.5m length with a 33mm minimum bend radius fits tight spaces without compromising signal integrity.
- EFFORTLESS PLUG PLAY - Hot-pluggable design with gold-plated connectors ensures seamless integration—no drivers or software needed.
- ROCK SOLID RELIABILITY - Individually tested with TDR & VNA, boasting an impressive 50 million hours MTBF for uninterrupted performance.
- ECO FRIENDLY EFFICIENCY - Passive twinax cable consumes less than 0.2W, delivering high performance with minimal power draw.
- BLAZING 40 GBPS THROUGHPUT - Experience ultra-fast data transfer with 40G QSFP+ connectivity, perfect for high-demand network environments.
This 0.5-meter passive 40G QSFP+ direct attach copper twinax cable offers blazing 40Gbps speeds with ultra-low latency and power consumption under 0.2W. Engineered for Cisco compatibility and rigorously tested for reliability, it features gold-plated QSFP connectors for easy hot-plug use and a durable PVC jacket. Ideal for professional network setups demanding high performance and minimal downtime.
Reviews
M**.
DAC
Great item works like a champ. It came very quickly as well.
C**S
Great cable
Works with Juniper switches (EX-2300x, EX4300).This hits all the key points:- affordable- flexible- worksHaven't tested on an Arista yet, and really unsure how that will go thanks to Arista deciding to lock out non-Arista optics. I've seen DACs handled differently than optics in the past on some equipment, not sure if Arista does the same or if the asinine lockout extends to DACs as well. I'll update after I get the Arista out of storage and can check.Update: Working between a Juniper EX4300 and Arista 7050S-64. Can't comment on other Arista models, but it seems to work with the 7050S-64.
N**N
Did exactly what it is intended to do.
Worked great. Used these to interconnect a pair of Arista 7050TX switches in my lab with 8 compute nodes with Chelsio NICs for a FREEBSD NAS.
M**N
great price
I cannot believe this cable was so cheap & works perfectly. Saved me about $100 & my client was even happier
T**Y
Worked as expected
Worked as expected. Fit our needs perfectly.
L**E
Fails to perform
I attempted to use these QSFP28 DAC cables to connect four Mellanox MCX455A-ECAT NICs to a MikroTik CRS504-4XQ-IN switch. The switch rejected the cables, and would not send a single byte across any of them. I then checked the cables' functionality by running them directly between two NICs. This was successful, in that I could ping one card from the other. However, the NICs were able to negotiate only 1G speed across the cable.I then purchased a MikroTik-brand 100G QSFP28 cable, which worked perfectly and immediately negotiated 100G connectivity. I considered that MikroTik might have some kind of vendor lock-in, but that leaves me with the mystery of why I got only 1G speed with these cables run directly between the Mellanox NICs. So I have to conclude these cables are simply not up to the task of 100G networking.
P**K
Excellent quality
The quality of this cable was as good as can be expected. Excellent quality for a great price I’m very happy with it. I would recommend it to anyone looking for a solution like this. We are an ISP and we are using us in our datacenter.
J**P
Works with Ubiquiti
Great DAC cable! Using it connecting an Ubiquiti UDM Pro and a Ubiquiti USW-PRO-24 port switch for a hotel project and it's handling gigabit speeds just fine. Warms up a little bit nothing of concern.
Common Questions
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