​​Defining the CB-LC-LC-MMF20M=​​

The ​​CB-LC-LC-MMF20M=​​ is a Cisco-branded ​​duplex multimode fiber (MMF)​​ optic cable with LC connectors on both ends. Designed for short-range, high-speed data transmission, this 20-meter cable supports ​​10/40/100G Ethernet​​ and is optimized for use in data centers, enterprise networks, and storage area networks (SANs). Its OM3/OM4 fiber grading ensures low signal loss and compatibility with high-bandwidth applications.

​​Key Technical Specifications​​

• ​​Connectors​​: Duplex LC/LC, ensuring secure, low-loss connections.
• ​​Fiber Type​​: OM3 or OM4 MMF, supporting speeds up to ​​100Gbps​​ at 20 meters.
• ​​Wavelength​​: 850nm (VCSEL laser optimized).
• ​​Standards Compliance​​: Meets ​​IEEE 802.3ba​​, ​​QSFP+​​, and ​​QSFP28​​ specifications.
• ​​Durability​​: Armored options available for high-traffic or harsh environments.

​​Compatible Devices and Use Cases​​

The ​​CB-LC-LC-MMF20M=​​ works with Cisco hardware including:

• ​​Switches​​: Nexus 9000 Series (e.g., N9K-C9336C-FX2), Catalyst 9300/9500.
• ​​Transceivers​​: Compatible with ​​SFP+, QSFP+, QSFP28​​, and ​​CFP2​​ modules.
• ​​Routers​​: ASR 9000 Series for high-density aggregation.

​​Primary Applications​​:

• Connecting top-of-rack (ToR) switches to end-of-row (EoR) distribution layers.
• Short-reach links in hyper-converged infrastructure (HCI) or SAN environments.

​​Addressing Common User Concerns​​

​​Q: Can this cable support 100G over 20 meters?​​
A: Yes—OM4 MMF enables ​​100G-SR4​​ at 20m using QSFP28 transceivers.

​​Q: Is it compatible with non-Cisco transceivers?​​
A: While physically functional, Cisco recommends using OEM cables to avoid ​​DDM/DOM monitoring errors​​ in third-party optics.

​​Why Itmall.sale for CB-LC-LC-MMF20M= Purchases?​​

For mission-critical fiber links, counterfeit cables risk signal degradation and compliance failures. [​​“CB-LC-LC-MMF20M=” link to (https://itmall.sale/product-category/cisco/)​​ provides:

• ​​Cisco Warranty Coverage​​: Full support for defects or performance issues.
• ​​OM3/OM4 Verification​​: Pre-tested cables with documented insertion loss metrics.
• ​​Bulk Order Savings​​: Discounted pricing for large-scale data center deployments.

​​Final Perspective​​

In a world racing toward 400G, it’s easy to overlook the cables that make it all possible. The ​​CB-LC-LC-MMF20M=​​ isn’t just a “dumb pipe”—it’s a precision tool. Having debugged network stalls caused by off-brand MMF cables, I’ve learned that Cisco’s certification isn’t marketing fluff; it’s a guarantee. For enterprises betting their ops on high-speed connectivity, this cable is a small price for reliability.