CB-LC-LC-MMF4M= – How Does This Cisco Fiber Cable Optimize Short-Reach Data Center Connectivity?

What Is the CB-LC-LC-MMF4M= Designed For?

The ​​CB-LC-LC-MMF4M=​​ is a Cisco-certified duplex multimode fiber (MMF) patch cable engineered for high-density, short-distance connections in data centers and enterprise networks. With ​​LC-LC connectors​​ and a 4-meter length, it’s ideal for linking switches, servers, and storage systems within racks or adjacent cabinets, minimizing latency and signal loss in 10G/40G/100G environments.

Key specifications:

• ​​Fiber type​​: OM4 50/125µm multimode.
• ​​Max data rate​​: 100Gbps at 150 meters (OM4, with MPO breakout).
• ​​Insertion loss​​: <0.3 dB, ensuring minimal signal degradation.

Key Technical Advantages Over Generic Alternatives

• ​​Cisco Validated Design (CVD) compliance​​: Guarantees seamless compatibility with ​​Cisco Nexus 9000/3000 Series​​ and UCS Fabric Interconnects, avoiding CRC errors common with uncertified cables.
• ​​Bend-optimized design​​: Tolerates tight bend radii (down to 7.5mm) without performance drops, critical in densely packed racks.
• ​​Flame-retardant jacket​​: Complies with ​​IEC 60332-3-24​​ for reduced fire hazards in plenum-rated spaces.

Addressing Core User Concerns

​​Q: Can this cable support 40G/100G Ethernet without adapters?​​
A: Yes—when paired with Cisco ​​QSFP-40G-SR4​​ or ​​QSFP-100G-SR4-S​​ transceivers, it supports 40G/100G via MPO-LC breakout configurations.

​​Q: Why choose a 4-meter length for intra-rack use?​​
A: Excess cable length increases clutter and airflow blockage. The 4-meter design ​​reduces slack by 60%​​ compared to standard 5m cables, improving thermal management.

​​Q: Is OM4 necessary for 4-meter connections?​​
A: While OM3 suffices for 10G at this distance, OM4 future-proofs deployments for ​​400G upgrades​​, which require stricter attenuation limits.

Where to Source Authentic CB-LC-LC-MMF4M= Cables

For guaranteed performance and Cisco’s limited lifetime warranty, purchase from itmall.sale, a certified supplier of Cisco optical networking components.

Field-Tested Perspective

In hyper-converged infrastructures, ​​every decibel matters​​. The CB-LC-LC-MMF4M=’s sub-0.3dB loss might seem trivial, but in stacked setups with 10+ interconnected devices, cumulative loss can cripple throughput. Having resolved outages caused by “good enough” generic cables, I’ve learned that Cisco’s optical tolerances aren’t luxuries—they’re insurance against cascading failures.