Cisco CPAK-100G-PSM4 Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 100GBASE-PSM4 CPAK Hot-Swappable Parallel Single-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:CPAK-100G-PSM4
Naming Breakdown
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CPAK: Cisco Parallel Attached Kit, proprietary hot-pluggable 100G transceiver form factor for Cisco high-density 100G line cards
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100G: Aggregate 100 Gigabit bandwidth, 4 × 25.78125 Gbps NRZ electrical lanes
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PSM4: Parallel Single-Mode 4-lane optical interface compliant with PSM4 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 parallel optical lanes operating within the wavelength window of 1295 nm to 1325 nm. All four lanes utilise identical optical wavelength range without wavelength multiplexing.
This module adopts parallel transmission architecture, requiring8 active single-mode fibers (4 Tx + 4 Rx)within a 12-fiber MPO-12 APC cable assembly. It implements uncooled DML transmitters and PIN photodiode receiver array.
Key Feature: Supports breakout capability to four independent 25G interfaces on compatible platforms.
Protocol Support: 100 Gigabit Ethernet; OTU4 OTN transport supported on applicable routing/transport hardware.
Core Product Positioning
The Cisco CPAK-100G-PSM4 is a commercial-grade hot‑swappable CPAK optical transceiver designed for cost-effective short-reach 100 Gigabit parallel single-mode interconnections inside large-scale data centers. It enables leaf-spine fabric uplinks, rack-to-rack aggregation, and intra-pod interconnections up to 500 meters. Compared with CWDM4 and LR4 transceivers, PSM4 eliminates internal WDM components to reduce hardware cost for medium-short single-mode links. 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);
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-PSM4 interface operation.
Supported Fiber Media
Single‑Mode Fiber (SMF) G.652 (OS2, 9/125μm) only; incompatible with multi-mode fiber.
Connector Type
MPO‑12 APC multifiber optical connector
Important: APC-terminated MPO cables are mandatory; UPC MPO cables are not supported.
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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Operating Wavelength Window: 1295 nm ~ 1325 nm (all four lanes share same wavelength range)
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Electrical Interface: 4 × 25.78125 Gbps NRZ
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Modulation Scheme: NRZ
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Transmitter: Uncooled DML array; Receiver: PIN photodiode array
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Operating Mode: Native 100G aggregate mode or breakout into four independent 25G ports (platform dependent)
Maximum Transmission Distance
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Up to500 metersover standard G.652 OS2 single-mode fiber
Optical Power Budget (Per Lane)
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Average Transmit Optical Power: −9.4 dBm ~ +2.0 dBm
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Minimum Receiver Sensitivity: −9.4 dBm
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Maximum Allowable Received Optical Power: +2.0 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-PSM4 NRZ Ethernet; supports OTU4 OTN mapping on applicable routing platforms.
Supports breakout to four independent 25GE interfaces on compatible hardware.
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 (≤500m)
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Intra-pod aggregation interconnections over parallel MPO single-mode trunk cabling
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Cost-sensitive data center links where CWDM4 duplex LC solution is not preferred
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Deployments requiring breakout to four independent 25GE server or storage uplinks
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High-density 100G port deployments on Nexus 7000/7700 F3 switching platforms
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: PSM4 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-PSM4 CPAK Optical Transceiver
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Hardware Installation Guide
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Safety and Regulatory Documentation
MPO‑12 APC single-mode trunk cables sold separately. Requires 8 active single-mode fibers for bidirectional transmission.
Model Comparison Reference
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CPAK-100G-PSM4: CPAK MPO‑12 APC parallel SMF, max 500m, breakout-capable, parallel architecture
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CPAK-100G-CWDM4: CPAK Duplex LC CWDM SMF, max 2km, 2-fiber bidirectional, WDM architecture
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CPAK-100G-LR4: CPAK Duplex SC LAN-WDM SMF, max 10km long intra-DC links
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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-SR4: CPAK MPO‑12 UPC parallel multi-mode, max 100m (OM4), rack short-reach links
UNSPSC Classification Code
43222618 – Cisco CPAK-100G-PSM4 short-reach parallel single-mode CPAK transceiver with DOM, hot-swappable breakout-supported 100 Gigabit optical module for cost-effective intra-data-center leaf-spine and aggregation 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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