Cisco Compatible QSFP-DD Modules

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Cisco Compatible QSFP-DD is an eight-lane, high-density pluggable transceiver module compliant with the QSFP-DD MSA, engineered to deliver up to 400 Gbps per port in Cisco switches, routers, and data-center equipment.

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Cisco Compatible QSFP-DD modules support lane speeds up to 50 Gbps, aggregating to 200 Gbps or 400 Gbps per port, enabling Ethernet, InfiniBand, and OTN applications in enterprise and hyperscale networks.

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Depending on the module variant, Cisco Compatible QSFP-DD supports multimode fiber (OM3/OM4) for up to 150 m, single-mode OS2 fiber for up to 10 km or 40 km, and DWDM options for up to 80 km.

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Yes. Cisco Compatible QSFP-DD is backward compatible with QSFP28 ports via a QSFP-DD to QSFP28 adapter cage, allowing seamless operation at 100 Gbps in legacy Cisco QSFP28 slots.

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Verify compatibility by matching the Cisco hardware firmware version, checking the Cisco compatibility matrix, and confirming the QSFP-DD MSA compliance statement provided by the transceiver vendor.

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Cisco Compatible QSFP-DD modules support Digital Diagnostics Monitoring (DDM/DOM) for real-time monitoring of optical power, temperature, voltage and laser bias current via the I²C interface.

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To install, power down the port if required, align the module with the port, gently insert until the latch engages, then power up and verify link status via Cisco IOS or NX-OS show commands.

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Typical power consumption ranges from 5 W to 12 W per module, depending on fiber type and rate. Refer to the vendor datasheet and Cisco platform Q‐series power guidelines for precise budgeting.

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Ideal applications include 5G fronthaul, hyperscale data-center spine and leaf, high-performance computing clusters, and next-generation carrier Ethernet requiring high-density, high-speed interconnects.

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Cisco Compatible QSFP-DD adopts the QSFP-DD MSA form factor, featuring a 16-lane electrical interface on a QSFP footprint. It meets all mechanical, power, and thermal specifications defined in the QSFP-DD specification.

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Yes. Using a 400 Gbps to 4×100 Gbps breakout cable or adapter, a Cisco Compatible QSFP-DD port can split into four independent 100 Gbps links, provided the Cisco switch supports breakout functionality.

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Cisco Compatible QSFP-DD modules typically operate in the commercial range of 0 °C to +70 °C. Extended or industrial temperature variants are available for –40 °C to +85 °C in harsh-environment deployments.

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Verify fiber polarity, cleanliness, and insertion depth. Check DDM readings for power or temperature anomalies, confirm Cisco platform port configuration, and ensure firmware matches the transceiver compatibility matrix.

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Choose passive DACs for links up to 3 m to minimize cost. For distances beyond 5 m or for reduced power and extended reach, select active DACs or AOCs with integrated signal amplification.

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Advantages include cost savings, flexibility in sourcing, adherence to MSA interchangeability, and support for Cisco diagnostics, provided the module is Cisco-listed and tested for full interoperability.

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Purchase from Cisco-authorized resellers, verify the Cisco fit-for-purpose list, request MSA compliance certificates, and use Cisco IOS/NX-OS show commands to confirm vendor and part-number authenticity.