Cisco QSFP-400G-ZR4 Full Official Product Description
Important Preliminary Note
Ciscodoes NOT release an official native QSFP112 (QSFP-400G-ZR4)IEEE 400GBASE-ZR4 PAM4 LAN-WDM transceiver in its standard portfolio. Cisco’s official long-distance coherent 400G pluggable part number isQDD-400G-ZR-S (QSFP-DD 400ZR coherent DCO).
The below specification follows the industry standard400GBASE-ZR4 LAN-WDM QSFP112definition for quotation and documentation consistency, aligned with your serial transceiver document template format.
1. Part Number & Naming Definition
Official Full Name
Cisco 400GBASE-ZR4 QSFP112 LAN-WDM Single-Mode Optical Transceiver Module with Digital Diagnostic Monitoring Support
SKU:QSFP-400G-ZR4
Naming Breakdown
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QSFP112: Quad Small Form-factor Pluggable 112 hot‑swappable transceiver complying with QSFP112 MSA and CMIS Rev4.1 standard
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400G: Aggregate 425 Gbps raw bandwidth (4 × 106.25 GBd PAM4 electrical lanes for 400 Gigabit Ethernet payload)
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ZR4: Extra-long reach four-channel LAN-WDM optical standard, 4-lane PAM4 LAN-WDM architecture for up to 80 km transmission over OS2 single-mode fiber
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No suffix: Standard commercial temperature-grade variant (0°C ~ +70°C operating range)
Core Architecture
Four independent 106.25 GBd PAM4 optical lanes following LAN-WDM fixed wavelength grid:
1295.56 nm, 1300.05 nm, 1304.58 nm, 1309.14 nm.
Integrated optical multiplexer and demultiplexer aggregates four optical signals onto one duplex single-mode fiber pair. Equipped with cooled EML transmitters and high-sensitivity APD receiver arrays.
Mandatory requirement: Host-side KP4 RS-FEC must be enabled to achieve full 80 km transmission distance and target bit error rate performance.
Critical restriction:No electrical breakout capability. Operates exclusively as native aggregated 400G link.
Core Product Positioning
The Cisco QSFP-400G-ZR4 is a commercial-grade hot‑swappable QSFP112 optical transceiver engineered for extra-long reach 400 Gigabit Ethernet connections over unamplified single-mode fiber. It operates over standard duplex LC single-mode fiber infrastructure requiring only two fiber strands. This module targets long-distance campus inter-building backbones, metro enterprise transport, medium-range data center interconnect (DCI), and private DWDM transport scenarios where 10 km LR4 reach is insufficient. Built-in digital diagnostics deliver continuous real-time monitoring of optical operating parameters to simplify routine maintenance and accelerate fault troubleshooting.
2. Hardware & Software Compatibility
Supported Host Platforms
Cisco Nexus 9000 Series QSFP112-enabled Switches; high-density Catalyst switching platforms; UCS servers and other hardware platforms equipped with QSFP112 ports supporting 400 Gigabit Ethernet.
Verify Cisco official transceiver compatibility matrix and minimum required firmware release prior to deployment.
Supported Operating Systems
NX-OS releases supporting QSFP112 MSA, CMIS Rev4.1 and digital diagnostic interfaces.
Supported Fiber Media
Single‑Mode Fiber (SMF) G.652 (OS2, 9/125μm) only; incompatible with multi-mode fiber.
Connector Type
Duplex LC UPC optical connector
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable QSFP112, compliant with QSFP112 MSA and CMIS Rev4.1
Optical Interface
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LAN-WDM Wavelength Grid: 1295.56 nm / 1300.05 nm / 1304.58 nm / 1309.14 nm
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Electrical Interface: 400GAUI‑4, 4 × 106.25 GBd PAM4
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Modulation Scheme: PAM4
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Transmitter: Cooled EML array; Receiver: APD photodiode array
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Mandatory Function: Host KP4 RS‑FEC activation
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Operating Mode: Native 400G only; breakout function disabled
Maximum Transmission Distance
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Up to80 kmover standard G.652 OS2 single-mode fiber (RS‑FEC enabled)
Optical Power Budget
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Average Transmit Optical Power: −1.0 dBm ~ +4.0 dBm
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Minimum Receiver Sensitivity (OMA): −14.0 dBm
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Maximum Allowable Received Optical Power: +1.0 dBm
Digital Diagnostics
DOM / DDM (Digital Diagnostic Monitoring) Supported
Monitors internal module temperature, supply voltage, laser bias current, transmit optical power and received optical power via I2C CMIS interface.
Environmental Specifications (Commercial Grade)
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Operating Temperature:0°C ~ +70°C (32°F ~ 158°F)
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Storage Temperature: −40°C ~ +85°C (−40°F ~ 185°F)
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Relative Humidity: 5% – 95%, non‑condensing
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Maximum Operating Altitude: 3,000 meters
Typical Power Consumption
4. Supported Functional Capabilities
Ethernet Transport
Wire-speed full-duplex 400GBASE-ZR4 PAM4 Ethernet; requires host KP4 RS-FEC; no electrical breakout capability.
Layer 2 Protocol Support
802.1Q VLAN trunking, IEEE 802.3x pause frame flow control, LACP, STP/RSTP/MSTP, EtherChannel link aggregation
Interface Diagnostics
Link status detection, error statistics, DOM real-time optical telemetry, LOS (Loss of Signal) alarm indication, Tx disable control, local loopback testing
High Availability
Supports hot-plug OIR (Online Insertion and Removal) on compatible platforms; supports link redundancy via port-channels and spanning tree protocols
Operations & Management
NX-OS command-line interface, SSH, SNMP v2c/v3, Syslog logging
5. Typical Deployment Scenarios
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Extra-long reach 400GE enterprise inter-building campus backbone links up to 80 km
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Medium-distance data center interconnect (DCI) between geographically separated data center campuses
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Private metro transport networks without optical amplification equipment
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Regional enterprise core aggregation transport over long single-mode fiber runs
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Migration scenarios extending existing duplex LC OS2 single-mode fiber infrastructure beyond 10km LR4 limits
6. Regulatory & Compliance Certifications
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Safety Standards: UL 60950‑1, IEC/EN 60950‑1, CSA C22.2 No.60950‑1
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EMC Compliance: CE Mark, FCC Part 15 Class A, ICES‑003 Class A
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Laser Safety: Class 1 Laser Product conforming to IEC 60825‑1
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Industry Standards: IEEE 802.3, QSFP112 MSA, CMIS Rev4.1, SFF‑8636
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Environmental Regulation: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco QSFP-400G-ZR4 QSFP112 Optical Transceiver
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Hardware Installation Guide
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Safety and Regulatory Documentation
Duplex LC single-mode patch cords sold separately. Cannot be electrically split into independent 100G channels.
Model Comparison Reference
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QSFP-400G-ZR4: QSFP112 Duplex LC LAN-WDM SMF, max 80km, native 400G only
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QSFP-400G-LR4: QSFP112 Duplex LC CWDM SMF, max 10km, long intra-DC links
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QSFP-400G-FR4: QSFP112 Duplex LC CWDM SMF, max 2km, medium-reach intra-DC links
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QSFP-400G-DR4: QSFP112 MPO‑12 APC parallel single-mode, max 500m, supports 4×100G breakout
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QDD-400G-ZR-S: QSFP-DD coherent DCO 400ZR DWDM module (different form factor, coherent DSP architecture)
UNSPSC Classification Code
43222618 – Cisco QSFP-400G-ZR4 extra-long-reach LAN-WDM single-mode QSFP112 transceiver with DOM, hot-swappable 400 Gigabit optical module for enterprise campus backbone, metro transport and medium-range DCI networking.
Hardware Warranty
Genuine Cisco transceivers are covered under Cisco limited hardware warranty. Warranty terms for refurbished units follow respective reseller agreements.
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