Arista Networks QSFP-40G-LR4-20 Compatible 40G QSFP+ ELR4 Transceiver Module
The QSFP-40G-LR4-20 compatible module serves equipment requiring a 40G QSFP+ interface with 1310nm optics and a 20km rating. Connection is through Duplex LC. Product data, application guidance and factory verification are presented together to support field technicians install, maintain and identify the exact compatible module.
OEM Part Number: QSFP-40G-LR4-20HT Part Number: QSFP-ELR4-40G
Product Highlights
- Compatible alternative to Arista Networks QSFP-40G-LR4-20
- 40G connectivity at 41.2Gbps (4x 10.3Gbps)
- Optical wavelength: 1310nm
- Specified reach: 20km
- Duplex LC / SMF interface
- Operating temperature: 0 to 70°C(32 to 158°F)
- Factory compatibility verification and optical performance testing before shipment
Specifications
| Arista Networks Compatible | QSFP-40G-LR4-20 |
|---|---|
| Manufacturer | HT |
| HT Part Number | QSFP-ELR4-40G |
| Form Factor | QSFP+ |
| Max. Data Rate | 41.2Gbps (4x 10.3Gbps) |
| Wavelength | 1310nm |
| Max. Transmission Distance | 20km |
| Connector | Duplex LC |
| Media | SMF |
| Transimitter Type | DFB CWDM |
| Receiver Type | PIN |
| TX Power | -4.5~2.3dBm |
| Receiver Sensitivity | <-12.5dBm |
| Power Budget | 8dB |
| Receiver Overload | 3.3dBm |
| Max. Power Consumption | ≤3.5W |
| Extinction Ratio | >3.5dB |
| Operating Temperature | 0 to 70°C(32 to 158°F) |
| Protocols | QSFP+ MSA, SFF-8436 |
Field Installation and Maintenance
Inspect the connector and patch lead before installation, then support the fiber without pulling on the module housing. Release the latch properly during maintenance and keep dust protection on unused interfaces. If a module is removed for later use, retain its part-number label and record its original port. For this model, the principal parameters are data rate 41.2Gbps (4x 10.3Gbps), wavelength 1310nm, rated reach 20km.
Applications and Optical Link Design
Use this module for equipment interconnection over the specified single-mode fiber plant, including enterprise backbone, campus, metro or data-center interconnect links according to its rated distance. Confirm that both ends use the same optical standard and wavelength plan, and allow for connector, splice and patch-panel loss within the stated power budget.
Before deployment, check the host port type, supported data rate and firmware requirements. The 40G interface configuration must match the remote equipment; sharing a QSFP+ housing alone does not make two transceiver types interoperable.
The single-mode link budget should include fiber attenuation, connectors, splices and panels over the intended 20km route. Keep the Duplex LC interface clean and match the remote optical standard. Consider receiver overload as well as insufficient power on short links.
Optical Acceptance, Diagnostics and Handling
For this model, the specified transmit-power range is -4.5~2.3dBm; receiver sensitivity is <-12.5dBm; the stated optical power budget is 8dB. A sound acceptance record includes link state, diagnostic temperature, supply voltage and transmit or receive levels where the host exposes them. Compare the readings with the stated ranges rather than treating any received light as proof of adequate margin. Persistent alarms or borderline values should trigger an end-face and complete-channel inspection. Before every insertion, keep dust caps in place until the patch lead is ready, avoid touching the optical end face and use an appropriate inspection and cleaning procedure. Do not look into an active optical interface.
Quality Assurance and Packaging
Quality control covers the optical or electrical interface, host identification and operating link. The verified unit is then individually protected and cartoned. Customer references, rack groups and project packing lists can be added for volume orders.
Arista Networks Compatibility and Factory Testing
Compatibility testing for QSFP-40G-LR4-20 combines identification with a live link and available transmit, receive and alarm information. Connector condition is inspected separately. Equipment model, hardware revision and software release can be reviewed before dispatch where platform behavior is uncertain.
Frequently Asked Questions
Is this an original Arista Networks transceiver?
No. It is an HT-manufactured compatible alternative for equipment that specifies QSFP-40G-LR4-20, not an original Arista Networks-branded module.
Which fiber and connector are required?
Use Duplex LC with SMF. The specified maximum reach is 20km, subject to fiber quality and total link loss.
Can it be mixed with another wavelength or reach version?
Only when the two ends share the same optical standard, wavelength plan and supported data rate. Check the exact part numbers and link budget rather than relying only on the module form factor.
Ordering Information
Use QSFP-40G-LR4-20 as the compatibility cross-reference and QSFP-ELR4-40G as the HT ordering identity. Keep other reaches or wavelength directions on separate order lines. Neutral labels, customer packaging and project-specific compatibility review are available on request.
Shipping and Lead Time
Standard configurations normally ship within one to three working days, with production lead times confirmed for larger quantities. International courier, air freight and sea freight are available; customer courier accounts and nominated forwarders are accepted.
