Q1: What are the key deployment differences between 100G CWDM4 and 100G LR4 transceivers for Arista data centers?
A1: Tailored for Arista campus and intra-data center networking, our 100G CWDM4 modules support 2km short&medium-distance transmission with low power consumption and cost advantages. In contrast, 100G LR4 modules are designed for 10km long-distance cross-site interconnection. For 2km and under 100G link projects, our Arista-compatible CWDM4 solution delivers higher cost performance and lower operating power consumption.
Q2: Why is 100G CWDM4 a more cost-efficient option than PSM4 for mainstream Arista leaf-spine fabrics?
A2: PSM4 modules only support a maximum 500m transmission distance, limiting Arista cabinet-to-cabinet deployment. Our 100G CWDM4 QSFP28 module extends the reach to 2km, covering almost all intra-data center and campus DCI scenarios. With unified batch quality and affordable bulk pricing, it effectively reduces repeated hardware investment and overall network upgrade costs for Arista fabric architectures.
Q3: Can I deploy 100G CWDM4 QSFP28 modules on OM3/OM4 multimode fiber links?
A3: Deployment on multimode fiber is not feasible. Our Arista-certified 100G CWDM4 transceivers are engineered exclusively for OS2 single-mode fiber. OM3/OM4 multimode fiber cannot support CWDM4 wavelength transmission, causing severe signal loss, unstable optical power, and frequent link flutters that fail to meet 100G business transmission standards.
Q4: Is mismatched pairing of 100G CWDM4 and 100G LR4 transceivers acceptable for Arista 100G links?
A4: We strictly advise against asymmetric transceiver pairing for formal Arista network operation. CWDM4 and LR4 adopt different wavelength schemes, optical power budgets and receiving sensitivity parameters. Cross-model pairing will trigger optical power mismatch and random bit errors. Our matched end-to-end CWDM4 modules ensure zero-error, stable long-term operation for Arista 100G links.
Q5: Why do DDM monitoring readings show minor wavelength deviations on CWDM4 transceiver ports?
A5: Tiny wavelength fluctuations are normal for commercial optical modules within industry tolerance ranges. Our Arista-compatible CWDM4 modules undergo precise wavelength calibration and aging screening before delivery. Slight DDM data deviations will not impact link stability, bandwidth performance or long-term service life in actual Arista network operation.
Q6: What is the allowable optical loss threshold for stable 2km 100G CWDM4 fiber links?
A6: Our QSFP-100G-CWDM4 compatible modules feature a standardized industrial power budget for 2km single-mode links. The total optical loss generated by fiber fusion, jumpers and patch panel interfaces must be controlled within the standard specification. This design guarantees error-free full-speed 100G transmission and stable link status for Arista switch networking.
Q7: How to troubleshoot persistent low Rx power on CWDM4 links after routine fiber cleaning?
A7: If fiber cleaning fails to restore normal receiving power, check for excessive fiber bending, aging fiber cores or loose port contact. Our factory-tested CWDM4 modules maintain highly sensitive and stable receiving performance. We provide professional one-on-one technical troubleshooting for bulk clients to quickly resolve link power anomalies and restore normal network operation.
Q8: Is surface heating of CWDM4 QSFP28 modules during long-time operation normal?
A8: Moderate heat generation is a normal physical phenomenon for high-speed 100G transceivers. Our modules adopt optimized 3.5W low-power circuitry and excellent heat dissipation structure. All products pass strict high and low temperature cycling tests, ensuring no overheating faults and stable 24/7 continuous operation in standard Arista data center environments.
Q9: Do third-party compatible CWDM4 modules compromise performance compared with original Arista OEM transceivers?
A9: There is no performance or stability gap. Our Arista-matched CWDM4 modules adopt industrial-grade laser chips and fully compliant standard protocols. Each batch completes real-machine testing on Arista mainstream switches to ensure zero-alarm operation, identical to original OEM modules, while offering more competitive procurement costs for enterprise projects.
Q10: Why adopt DML laser technology for our 100G CWDM4 QSFP28 transceivers instead of EML?
A10: Our CWDM4 modules apply mature DML direct modulation laser technology, which features lower power consumption, more stable four-wavelength output and higher cost performance. Compared with EML lasers, it perfectly matches the 2km medium-distance transmission characteristics of CWDM4, fully adapting to long-term stable operation requirements of Arista data center and enterprise core networks.
