Arista QSFP-100G-ER1 | 100G Single Lambda Transceiver, 1310nm, 40km SMF, LC

Q: What is the difference between ER1 and ER4 transceivers?
A: The ER1 uses a single lambda (wavelength) with PAM4 modulation to transmit 100G over one optical channel, while ER4 uses four separate wavelengths (LAN-WDM) with NRZ modulation. ER1 simplifies the optical architecture and reduces component complexity while achieving the same 40km reach as ER4.

Q: Is the QSFP-100G-ER1 compatible with Arista switches?
A: Yes, the QSFP-100G-ER1 is designed for use in Arista 100G QSFP28 ports. Always verify compatibility with your specific switch model using Arista's Transceiver and Cable Compatibility Guide, as some platforms may have specific power or thermal requirements.

Q: Does this transceiver require FEC to be enabled?
A: Yes, Forward Error Correction (FEC) is essential for PAM4 modulation at extended distances. The module includes built-in FEC support to detect and correct bit errors, ensuring reliable transmission across the full 40km reach over single-mode fiber.

Q: Can I use this transceiver for shorter distances?
A: While designed for 40km links, the QSFP-100G-ER1 can be used for shorter distances. However, proper optical attenuation may be required for very short links to protect the sensitive receiver from permanent damage due to excessive optical power.

Q: What applications is this transceiver best suited for?
A: The QSFP-100G-ER1 is ideal for metro network backbone connections, regional data center interconnects, campus core-to-core links, and service provider applications requiring 100G connectivity over distances from 10km to 40km using single-mode fiber infrastructure.