Cisco CPAK-100G-CWDM4 Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 100GBASE-CWDM4 CPAK Hot-Swappable Coarse Wavelength Division Multiplexing Single-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:CPAK-100G-CWDM4
Naming Breakdown
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CPAK: Cisco Parallel Attached Kit, proprietary hot-pluggable 100G transceiver form factor built for Cisco high-density 100G line cards
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100G: Aggregate 100 Gigabit bandwidth over 4 × 25.78125 Gbps NRZ electrical lanes
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CWDM4: Coarse Wavelength Division Multiplexing 4-lane optical interface following CWDM4 MSA standard
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No suffix: Standard commercial temperature-grade variant (0°C ~ +70°C operating temperature)
Core Architecture
Four independent 25.78125 Gbps NRZ optical lanes operating on standard CWDM4 wavelength grid:
1271 nm, 1291 nm, 1311 nm, 1331 nm.
Integrated internal MUX/DEMUX multiplexes four optical signals onto a single duplex single-mode fiber pair. Implements uncooled CWDM DML transmitters and PIN photodiode receiver array.
Critical Restriction:No electrical breakout capability. Operates only as native aggregated 100G link.
Protocol Support: 100 Gigabit Ethernet; OTU4 OTN transport supported on compatible routing/transport platforms.
Core Product Positioning
The Cisco CPAK-100G-CWDM4 is a commercial-grade hot‑swappable CPAK optical transceiver optimized for short-reach 100 Gigabit interconnections over single-mode fiber. As a cost-effective alternative to LR4 modules, it supports links up to 2 km for intra-data-center leaf-spine fabric, in-campus rack-to-rack aggregation, and short-distance data center interconnect (DCI). CPAK delivers superior port density and lower power consumption versus legacy CFP/CFP2 transceivers. 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 with F3-series 100G line cards (N7K-F306CK-25);
ASR 9000, CRS-X, NCS 2000 / 4000 / 6000 Series routing and transport platforms.
Verify Cisco official transceiver compatibility matrix and minimum required firmware release prior to deployment.
Supported Operating Systems
NX-OS, IOS-XR releases supporting CPAK transceiver recognition, DOM monitoring and 100GBASE-CWDM4 interface operation.
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 proprietary CPAK form factor
Dimensions: 11.6 × 34.8 × 101.2 mm
Optical Interface
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CWDM Wavelength Grid: 1271 nm / 1291 nm / 1311 nm / 1331 nm nominal
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Electrical Interface: 4 × 25.78125 Gbps NRZ
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Modulation Scheme: NRZ
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Transmitter: Uncooled CWDM DML array; Receiver: PIN photodiode array
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Operating Mode: Native 100G only; breakout function disabled
Maximum Transmission Distance
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Up to2 kmover standard G.652 OS2 single-mode fiber
Optical Power Budget (Per Lane)
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Average Transmit Optical Power: −6.5 dBm ~ +2.5 dBm
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Minimum Receiver Sensitivity: −11.5 dBm
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Maximum Allowable Received Optical Power: +2.5 dBm
Digital Diagnostics
DOM / Digital Optical Monitoring Supported (SFF-8472)
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-CWDM4 NRZ Ethernet; supports OTU4 OTN mapping on applicable routing platforms; 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 and ASR platforms; supports link redundancy via port-channels and spanning tree protocols
Operations & Management
NX-OS / IOS-XR 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 the same data center building (<2km)
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Low-cost in-pod aggregation interconnections over existing duplex LC single-mode fiber infrastructure
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Short-distance DCI between adjacent data center buildings within a single campus
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High-density 100G port deployments on Nexus 7000/7700 F3 switching platforms
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Cost-sensitive 100G links where LR4 10km reach capability is unnecessary
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: CWDM4 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-CWDM4 CPAK 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 25G channels.
Model Comparison Reference
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CPAK-100G-CWDM4: CPAK Duplex LC CWDM SMF, max 2km, uncooled low-cost short-reach single-mode
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CPAK-100G-LR4: CPAK Duplex SC LAN-WDM SMF, max 10km cooled EML long-reach
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CPAK-100GE-LR4: CPAK Duplex LC LAN-WDM SMF, max 10km, Ethernet-only without OTN
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CPAK-100G-PSM4: CPAK MPO‑12 APC parallel single-mode, max 500m
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CPAK-100G-SR4: CPAK MPO‑12 UPC parallel multi-mode, max 100m (OM4)
UNSPSC Classification Code
43222618 – Cisco CPAK-100G-CWDM4 short-reach CWDM single-mode CPAK transceiver with DOM, hot-swappable 100 Gigabit optical module for cost-effective intra-data-center leaf-spine, aggregation and short-range DCI networking on Nexus 7000/7700 and ASR9000 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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