Cisco CPAK-100G-SR4 Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 100GBASE-SR4 CPAK Hot-Swappable Parallel Multi-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:CPAK-100G-SR4
Naming Breakdown
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CPAK: Cisco Parallel Attached Kit, proprietary hot-pluggable 100G transceiver form factor designed for Cisco Nexus 7000/7700 F3-series line cards
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100G: 100 Gigabit Ethernet aggregate bandwidth (4 × 25.78125 Gbps electrical lanes)
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SR4: Short Reach 4-lane parallel multi-mode optical standard defined under IEEE 802.3bm 100GBASE-SR4
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No suffix: Standard commercial temperature-grade variant (0°C ~ +70°C operating temperature)
Core Architecture
Four independent 25.78125 Gbps optical lanes operating at nominal 850 nm VCSEL wavelength. Parallel optical design uses four transmit and four receive multi-mode fiber strands via one MPO-12 UPC multifiber connector. Implements VCSEL transmitter array and PIN photodiode receiver array.
Critical Restriction:No electrical breakout capability. Operates only as native aggregated 100G link.
Protocol Support: 100 Gigabit Ethernet; OTN mapping is platform-dependent.
Core Product Positioning
The Cisco CPAK-100G-SR4 is a commercial-grade hot‑swappable CPAK optical transceiver optimized for ultra-short reach 100 Gigabit Ethernet interconnections inside large-scale enterprise and cloud data centers. It delivers cost-effective high-density parallel MMF connectivity for leaf-spine fabric uplinks, aggregation pod interconnections, and rack-to-rack server switching links on Nexus 7000 / 7700 F3 hardware. Built-in DOM enables 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 7000 / Nexus 7700 Series switches equipped with F3-series 100G line cards (N7K-F306CK-25).
Verify Cisco official transceiver compatibility matrix and minimum required NX-OS firmware release prior to deployment.
Supported Operating Systems
NX-OS releases supporting CPAK transceiver recognition, DOM monitoring and 100GBASE-SR4 interface operation.
Supported Fiber Media
Multi‑Mode Fiber (MMF) OM3 / OM4; incompatible with single-mode fiber.
Connector Type
MPO‑12 UPC multifiber optical connector
Important: UPC-terminated trunk cables are mandatory; APC-type MPO connectors are not supported.
3. Physical & Optical Performance Specifications
Form Factor
Hot‑swappable CPAK proprietary form factor
Dimensions: 11.6 × 34.8 × 101.2 mm
Optical Interface
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Operating Wavelength: 842 nm ~ 862 nm (850 nm nominal VCSEL)
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Electrical Interface: 4 × 25.78125 Gbps
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Modulation Scheme: NRZ
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Transmitter: VCSEL array; Receiver: PIN photodiode array
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Operating Mode: Native 100G only; breakout function disabled
Maximum Transmission Distance
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OM3 MMF: up to70 meters
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OM4 MMF: up to100 meters
Optical Power Budget (Per Lane)
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Average Transmit Optical Power: −8.4 dBm ~ +2.4 dBm
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Minimum Receiver Sensitivity: −5.2 dBm
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Maximum Allowable Received Optical Power: +2.4 dBm
Digital Diagnostics
DOM / Digital Optical Monitoring Supported
Monitors internal module temperature, supply voltage, laser bias current, transmit optical power and received optical power.
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 100GBASE-SR4 NRZ Ethernet; 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 Nexus 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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Short-reach 100GE leaf-spine fabric uplinks within enterprise and cloud data center pods
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Rack-to-rack aggregation interconnections leveraging existing MPO‑12 multi-mode trunk cabling
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High-density server farm aggregation links on Nexus 7000 / 7700 F3 switching platforms
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Intra-pod 100 Gigabit interconnections within the same data center building
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 802.3bm, CPAK MSA specification, SFF‑8472 DOM standard
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Environmental Regulation: RoHS compliant, WEEE directive compliant
7. Standard Factory Package Contents
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Cisco CPAK-100G-SR4 CPAK Optical Transceiver
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Hardware Installation Guide
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Safety and Regulatory Documentation
MPO‑12 UPC multi-mode trunk cables sold separately. Cannot be electrically split into independent 25G channels.
Model Comparison Reference
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CPAK-100G-SR4: CPAK MPO‑12 UPC parallel MMF, max 100m (OM4), native 100G only
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CPAK-100G-LR4: CPAK duplex LC single-mode, max 10km long-reach intra-DC links
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CPAK-100G-CWDM4: CPAK duplex LC CWDM single-mode, medium reach
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QSFP-100G-SR4-S: QSFP28 form factor parallel multi-mode module (different footprint)
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CPAK-100G-PSM4: CPAK MPO‑12 APC parallel single-mode short-reach module
UNSPSC Classification Code
43222618 – Cisco CPAK-100G-SR4 short-reach parallel multi-mode CPAK transceiver with DOM, hot-swappable 100 Gigabit optical module for enterprise and cloud data center leaf-spine and aggregation networking on Nexus 7000/7700 F3 platforms.
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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