CPAK-100G-ER4L Genuine Cisco CPAK-100G-ER4L 100GBASE-ER4 Lite CPAK for SMF

Cisco CPAK-100G-ER4L - Overview

The CPAK family was Cisco’s proprietary pluggable form factor for 100G optics, offering smaller size and lower power consumption compared to CFP/CFP2 modules. The ER4L variant is optimized for extended reach while consuming less power than full ER4 optics.

🔧 Key Specifications

• Form Factor: Cisco CPAK (20% smaller than CFP2, ~40% lower power)
• Standard: 100GBASE-ER4 Lite (IEEE 802.3ba compliant)
• Wavelengths: 4 CWDM lanes (1295, 1300, 1305, 1310 nm)
• Reach: Up to 40 km over single-mode fiber (SMF)
• Interface: Duplex LC optical connector
• Data Rate: 100 Gbps (4x 25 Gbps lanes)
• Power Consumption: ~4.5 W (significantly lower than CFP ER4)
• Applications:
  • Metro and long-haul interconnects
  • Data center interconnect (DCI)
  • Service provider edge and core networks

🧩 Ideal Use Cases

• Service providers needing 100G long-reach connectivity with lower power draw
• Enterprise and data center operators interconnecting sites up to 40 km apart
• Migration path from CFP/CFP2 ER4 optics to smaller, more efficient CPAK modules