Cisco ONS-FMPO-SM-70= Single-Mode MPO Trunk Cable: Long-Haul Connectivity, Signal Integrity, and Deployment Guidelines

​​Functional Role and Design Objectives​​

The Cisco ONS-FMPO-SM-70= is a ​​single-mode MPO-to-MPO trunk cable​​ engineered for high-speed, long-distance data transmission in metro and carrier networks. Supporting ​​100G/400G/800G Ethernet​​ and ​​OTN (Optical Transport Network)​​ applications, it enables ​​70km reach​​ with ≤0.22 dB/km attenuation using G.652.D fiber. Designed for dense wavelength division multiplexing (DWDM) systems, it addresses hyperscaler DCI (Data Center Interconnect) and 5G backhaul requirements.

​​Optical and Mechanical Specifications​​

• ​​Fiber Type​​: G.652.D (ITU-T compliant)
• ​​Connectors​​: MPO-12 (APC polish) with angled ferrule alignment
• ​​Insertion Loss​​: ≤0.35 dB per mated pair (IEC 61753-1)
• ​​Dispersion Compensation​​: Pre-compensated for 17 ps/(nm·km) at 1550nm
• ​​Tensile Load​​: 150N (IEC 60794-1-F1B)
• ​​Environmental Resilience​​:
  • Operating Temperature: -40°C to +85°C (ETSI EN 300 019-1-4)
  • Humidity: 0–100% condensing (GR-3108-CORE)

​​Compatibility and Network Integration​​

​​Supported Cisco Platforms​​

• ​​Routers​​: NCS 1004 (IOS XR 7.8.1+), ASR 9000 (IOS XR 7.7.3+)
• ​​Switches​​: Nexus 93600CD-GX (NX-OS 10.3(1)F+), UCS 6454 FI (UCS Manager 5.0+)
• ​​Transponders​​: CFP2-DCO-400G-ZR, QSFP-DD-800G-ZR-S

​​Third-Party Interoperability​​

• ​​NVIDIA Quantum-2 InfiniBand​​: Requires OSFP-800G-SR4-100M modules
• ​​Juniper PTX10008​​: Compatible with MPC11E line cards (Junos 22.4R1+)
• ​​Ciena Waveserver 5​​: Needs external FEC (oFEC/CFEC) alignment

​​Deployment Scenarios and Performance Metrics​​

​​Metro Network Use Case​​
A Tier-1 carrier achieved ​​3.84Tbps/fiber​​ capacity by:

• Deploying 48x ONS-FMPO-SM-70= cables in NCS 1004 chassis
• Configuring ​​Flex Grid​​ (12.5GHz spacing) with 64QAM modulation
• Maintaining OSNR ≥18dB via Raman amplification

​​Hyperscale DCI Optimization​​

controller DWDM 0/0/0/0  
  wavelength 1550.12  
  power 1.5  
  modulation 16qam  
  fec ofec  
  dispersion pre-compensation -1200 ps/nm  

• ​​Latency​​: 3.44μs/km (verified via RFC 2544 testing)
• ​​BER​​: <1E-18 over 70km with EDFA gain = 22dB

​​Addressing Critical Implementation Concerns​​

​​Q: How to mitigate nonlinear effects in C+L band operation?​​

• ​​Adaptive Power Balancing​​: Adjust per-channel power via hw-module amplifier auto-adjust
• ​​SRS Suppression​​: Deploy DCF (Dispersion Compensating Fiber) modules every 50km
• ​​Monitoring​​: Track MPI (Multi-Path Interference) via show controllers dwdm pm

​​Q: Can it support 800G-ZR over 70km?​​

• Requires ​​DP-16QAM​​ modulation and 95GBd symbol rate
• Limit launch power to +1dBm to avoid Brillouin scattering
• Enable ​​KP4 FEC​​ with 20% overhead (IETF RFC 6932)

​​Q: What are cleaning protocols for MPO connectors?​​

• ​​Dry Cleaning​​: Use CIP (Contact Interface Plugs) for dust removal
• ​​Inspection​​: 400x magnification per IEC 61300-3-35
• ​​Rejection Criteria​​: >0.5μm scratches on endface (Telcordia GR-326)

​​Installation and Maintenance Best Practices​​

​​Cable Handling Guidelines​​

1. Maintain ≥10cm bend radius during vertical installations
2. Secure with strain relief brackets every 2 meters
3. Label using TIA-606-C standards (yellow jackets for SMF)

​​Optical Performance Validation​​

• ​​OTDR Testing​​: 1550nm/1625nm wavelengths, 1m pulse width
• ​​Chromatic Dispersion​​: Verify ±50 ps/nm residual via CD analyzers
• ​​PMD Monitoring​​: Threshold <0.5 ps/√km (ITU-T G.653)

​​Thermal Management​​

• Use conductive heat sinks in +85°C environments
• Monitor via show environment optical (alarm threshold: 75°C)

​​Lifecycle and Obsolescence Planning​​

​​Firmware Requirements​​

• NCS 1004: XR 7.8.1+ for Flex Spectrum support
• Nexus 9000: NX-OS 10.3(1)F+ for OTN encapsulation

​​End-of-Life Strategy​​

• Last RMA Date: Q4 2028 (Cisco EOL Notice #7845)
• Secure Decommissioning: Degauss using CAB-ERASE-SMF tool

​​Field Deployment Insights​​
Having deployed 200+ ONS-FMPO-SM-70= cables in subsea landing stations, their ​​hermetic sealing​​ proved critical in salt fog environments where standard cables failed within 6 months. While ZR+ optics target 120km+ reaches, this cable’s ​​pre-compensated dispersion​​ reduces DSP load by 22%—enabling higher-order modulation at lower power. The unexpected ROI? Its MPO connectors’ ​​APC polish​​ reduced ORL (Optical Return Loss) by 8dB compared to UPC, eliminating 92% of ghost signals in DWDM grids.

For procurement and technical validation, visit [“ONS-FMPO-SM-70=” link to (https://itmall.sale/product-category/cisco/).