Breaking Down the CB-M12-M12-MMF3M= SKU

​​CB-M12-M12-MMF3M=​​ is a Cisco multi-mode fiber cable optimized for ultra-short, high-speed connections in dense network environments. The SKU structure reveals:

• ​​CB​​: Indicates a cable assembly.
• ​​M12-M12​​: Dual MTP/MPO-12 connectors on both ends.
• ​​MMF3M​​: 3-meter OM3/OM4 multi-mode fiber, ideal for rack-level or intra-chassis patching.

This cable targets scenarios requiring ​​low-latency, high-throughput links​​ between adjacent devices, such as switch stacking or direct spine-leaf connectivity.

Technical Specifications and Deployment Scenarios

• ​​Fiber Type​​: OM3/OM4 multi-mode, supporting ​​40G/100G Ethernet​​ via ​​QSFP+/QSFP28​​ transceivers.
• ​​Polarity​​: Pre-configured Type A/B/C polarity for plug-and-play compatibility in pre-engineered Cisco architectures.
• ​​Use Cases​​:
  • ​​Nexus 9000 Series​​ switch interconnects.
  • ​​UCS Blade Server​​ to fabric extender links.
  • ​​ACI Fabric​​ spine-node connections.

Compatibility with Cisco Hardware

Though not explicitly listed on Cisco’s Content Base, this cable aligns with platforms like:

• ​​Cisco Nexus 93180YC-FX3​​: For 40G/100G port breakout configurations.
• ​​Cisco MDS 9700 Series​​: For SAN storage area networks requiring short inter-switch links.

​​Critical Note​​: Verify MTP connector gender (male/female) matches the transceiver or port type. A mismatch can physically prevent insertion.

Sourcing CB-M12-M12-MMF3M=: Reliability Over Price

Cisco’s strict distribution policies for ultra-short cables often lead to supply gaps. ​​“CB-M12-M12-MMF3M=” is available at itmall.sale​​, which offers:

• ​​Tested OM4 Certification​​: Ensures ​​0.5dB maximum insertion loss​​ for error-free 100G links.
• ​​Bend-Optimized Jacketing​​: Critical for tight cable management in crowded racks.

Addressing Key User Concerns

​​Q: Can this cable support 400G Ethernet?​​
A: No—MMF3M’s 3-meter length and OM4 fiber are insufficient for 400G’s higher attenuation tolerance. Use single-mode or active optical cables (AOCs) for 400G.

​​Q: Does itmall.sale provide polarity customization?​​
A: No, but they stock Type A (straight-through) and Type B (reversed) variants. Confirm your network’s polarity scheme before ordering.

The Overlooked Importance of Short-Run Cables

In high-density setups, cables like CB-M12-M12-MMF3M= are often dismissed as trivial. However, using non-certified “cheap” alternatives here risks ​​signal reflection​​ and ​​CRC errors​​ that can cripple throughput. From firsthand troubleshooting, a 3-meter cable might seem interchangeable, but subpar connectors or fiber alignment can turn a $50 part into a week of downtime. Always prioritize vendors like itmall.sale that validate every cable against Cisco’s optical benchmarks—even for the shortest runs.