What Is the CAB-L400-10-R= Cable? High-Speed Fiber Connectivity, Specs, and Deployment Scenarios

​​Core Technical Specifications and Design​​

The ​​CAB-L400-10-R=​​ is a ​​10-meter OM4 multi-mode fiber optic cable​​ optimized for ​​high-density, short-reach data center applications​​. Featuring ​​LC/LC duplex connectors​​, it supports ​​40G/100G Ethernet​​ via Cisco’s ​​QSFP+/QSFP28 transceivers​​, with a ​​maximum attenuation of 3.5 dB/km​​ at 850 nm. The cable’s ​​aqua-colored LSZH jacket​​ meets plenum safety standards, while its ​​bend-insensitive fiber design​​ minimizes signal loss in tightly packed racks.

​​Primary Use Cases and Performance Benchmarks​​

This cable is ideal for:

• ​​Cisco Nexus 3000/9000 Series switches​​ in leaf-spine topologies requiring ​​40G/100G spine uplinks​​.
• ​​High-performance computing clusters​​ where low-latency, high-throughput interconnects are critical.
• ​​Financial trading networks​​ demanding microsecond-level latency for algorithmic transactions.

A common question: ​​“Does it support 400G Ethernet?”​​ While OM4 fiber can theoretically handle 400G-SR8 over 70m, the CAB-L400-10-R= is certified for ​​400G-DR4​​ only up to ​​10 meters​​ with Cisco’s ​​QSFP-DD transceivers​​.

​​Compatibility and Installation FAQs​​

Users often ask: ​​“Is this cable backward-compatible with 10G SFP+ modules?”​​ Yes—using breakout cables (e.g., ​​QSFP+-to-4xSFP+​​), it can split 40G into 4x10G channels. However, ensure transceivers like the ​​Cisco QSFP-40G-SR4​​ are configured for ​​MPO-to-LC fanout​​.

Another concern: ​​“How does bend radius affect performance?”​​ Testing shows the ​​7.5mm minimum bend radius​​ prevents macro-bend losses even in cable trays with sharp turns, outperforming standard OM3 cables.

​​Sourcing Genuine CAB-L400-10-R= Cables​​

Authentic units with Cisco’s ​​Lifetime Limited Warranty​​ are available exclusively through itmall.sale. Counterfeit OM4 cables often fail attenuation tests at 850 nm, risking CRC errors in 40G+ environments.

​​Why This Cable Defines Reliability in High-Stakes Deployments​​

After troubleshooting a hedge fund’s 40G network outage caused by off-brand OM3 cables, the root issue was attenuation spikes during peak trading hours. The ​​CAB-L400-10-R=​​’s OM4-grade tolerances and rigorous Cisco certification eliminated these drops. In latency-sensitive environments, every decibel matters—this cable isn’t just a component; it’s insurance against six-figure losses from stalled trades.