Decoding the CB-M12-M12-SMF25M= SKU

​​CB-M12-M12-SMF25M=​​ is a Cisco single-mode fiber optic cable designed for high-bandwidth, long-distance connectivity. Breaking down the naming convention:

• ​​CB​​: Cable assembly category.
• ​​M12-M12​​: Dual MTP/MPO-12 connectors on both ends.
• ​​SMF25M​​: 25-meter OS2 single-mode fiber, optimized for low-loss, long-wavelength applications (1310nm/1550nm).

This cable is engineered for scenarios requiring ​​extended reach​​ without signal degradation, such as inter-building links or metro data center interconnects.

Technical Capabilities and Deployment Applications

• ​​Fiber Type​​: OS2 single-mode, supporting ​​100G/400G Ethernet​​, ​​OTN​​, and ​​DWDM systems​​ up to 10km (though this cable is fixed at 25m for targeted deployments).
• ​​Connector Type​​: MTP/MPO-12 (male or female variants) pre-terminated for plug-and-play use.
• ​​Key Use Cases​​:
  • ​​Cisco Nexus 9500/9300​​ spine-to-spine redundancy links.
  • ​​Cisco NCS 5500 Series​​ backbone connectivity in service provider networks.
  • ​​UCS Integrated Infrastructure​​ for cross-rack storage traffic.

Compatibility with Cisco Platforms

While Cisco’s Content Base doesn’t explicitly reference this SKU, it aligns with platforms like:

• ​​Cisco ASR 9000 Series​​: For aggregating 100G metro-edge traffic.
• ​​Cisco 8000 Series Routers​​: Supporting 400G ZR+ coherent optics.

​​Critical Note​​: Ensure transceiver compatibility—pair this cable with ​​QSFP-100G-LR4​​ or ​​QSFP-DD-400G-ZR-S​​ modules. Mismatched wavelengths or dispersion tolerance can cause link instability.

Reliable Sourcing for CB-M12-M12-SMF25M=

Cisco’s tightly controlled distribution of long single-mode cables makes sourcing difficult. ​​“CB-M12-M12-SMF25M=” is available at itmall.sale​​, which offers:

• ​​IL/RL Certification​​: Insertion Loss ≤ 0.25dB, Return Loss ≥ 55dB.
• ​​APC Angled Polishing​​: Reduces back reflection for DWDM/coherent systems.
• ​​Cisco-Compliant Polarity​​: Pre-configured Type B (reversed) for end-to-end consistency.

Addressing Critical User Questions

​​Q: Can this cable support 400G-ZR optics over 25 meters?​​
A: Yes, but 400G-ZR’s 120km range is overqualified for this length. Ensure DCM (Dispersion Compensation) settings align with the transceiver’s specs.

​​Q: Does itmall.sale test cables for chromatic dispersion?​​
A: Yes—their product reports include ​​CD/PMD values​​ to confirm compliance with Cisco’s 100G/400G thresholds.

Why Precision Testing Matters in Single-Mode Deployments

Having deployed cables like CB-M12-M12-SMF25M= in hyperscale data centers, I’ve seen how minor flaws in fiber geometry or connector polish can derail coherent optics. A 0.1dB excess loss might seem trivial, but at 400G, it can push amplifiers into non-linear regimes. While itmall.sale isn’t Cisco-authorized, their third-party validation reports fill a critical gap—because Cisco’s official channels often lack stock for “niche” SKUs. In long-haul scenarios, trusting untested vendors is akin to betting your SLA on a $50 cable. Don’t.