Cisco CPAK-100G-ER4L Full Official Product Description
1. Part Number & Naming Definition
Official Full Name
Cisco 100GBASE-ER4 Lite CPAK Hot-Swappable LAN-WDM Single-Mode Optical Transceiver Module with Digital Optical Monitoring Support
SKU:CPAK-100G-ER4L
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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ER4L: ER4 Lite, extended reach four-channel LAN-WDM optical variant; guaranteed up to 25 km without mandatory FEC
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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 LAN-WDM wavelength grid:
1294.53 nm ~ 1296.59 nm, 1299.02 nm ~ 1301.09 nm,
1303.54 nm ~ 1305.63 nm, 1308.09 nm ~ 1310.19 nm.
Integrated internal MUX/DEMUX multiplexes four optical signals onto a single duplex single-mode fiber pair. Implements cooled EML transmitter array and high-sensitivity PIN receiver array.
Key Characteristics: ER4 Lite specification,optimized for 25km guaranteed reach without FEC.
Critical Restriction:No electrical breakout capability. Operates only as native aggregated 100G link.
Protocol Support: 100 Gigabit Ethernet and OTU4 OTN transport (platform-dependent).
Core Product Positioning
The Cisco CPAK-100G-ER4L is a commercial-grade hot‑swappable CPAK optical transceiver designed for extended-reach 100 Gigabit interconnections over standard single-mode fiber. It fills the distance gap between 10 km LR4 and full 40 km ER4 modules, supporting links up to 25 km for intra-campus data center interconnect (DCI), multi-building enterprise backbone, and service provider metro aggregation. CPAK delivers higher port density and lower power consumption compared to 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 interface operation.
Supported Fiber Media
Single‑Mode Fiber (SMF) G.652 (OS2, 9/125μm) only; incompatible with multi-mode fiber.
Connector Type
Duplex SC/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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LAN-WDM Wavelength Grid: 1295 nm / 1300 nm / 1305 nm / 1310 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: Cooled EML 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 to25 kmover standard G.652 OS2 single-mode fiber (FEC not required for guaranteed reach)
Optical Power Budget (Per Lane)
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Average Transmit Optical Power: −2.9 dBm ~ +2.9 dBm
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Minimum Receiver Sensitivity: −14.0 dBm
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Maximum Allowable Received Optical Power: +4.5 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-ER4 Lite 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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Extended-reach 100GE DCI connections between buildings within large data center campuses (10km ~ 25km)
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Enterprise multi-building campus backbone transport over medium-long single-mode fiber runs
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Service provider metro aggregation, mobile backhaul and OTN transport deployments
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High-density 100G port deployments on Nexus 7000/7700 F3 switching platforms
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Network links where 10km LR4 reach is insufficient, while 40km full ER4 power budget 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: IEEE 802.3ba, 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-ER4L CPAK Optical Transceiver
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Hardware Installation Guide
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Safety and Regulatory Documentation
Duplex SC single-mode patch cords sold separately. Cannot be electrically split into independent 25G channels.
Model Comparison Reference
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CPAK-100G-ER4L: CPAK Duplex SC LAN-WDM SMF, max 25km, ER4 Lite, FEC not mandatory
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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, 10km, Ethernet-only without OTN support
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CPAK-100G-ER4F: CPAK Duplex LC ER4 variant supporting longer reach with FEC enabled
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CPAK-100G-SR4: CPAK MPO‑12 UPC parallel multi-mode, max 100m (OM4), short rack links
UNSPSC Classification Code
43222618 – Cisco CPAK-100G-ER4L extended-reach LAN-WDM single-mode CPAK transceiver with DOM, hot-swappable 100 Gigabit optical module for enterprise, cloud, and service provider medium-range DCI, campus backbone and metro transport 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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