10/100BASE-T SFPExtreme SFP1G-ZX120-55 Compatible 1G SFP Transceiver Module
The SFP1G-ZX120-55 compatible module serves equipment requiring a 1G SFP interface with 1550nm optics and a 120km rating. Connection is through Duplex LC. Product data, application guidance and factory verification are presented together to support high-density deployments balance optical performance, port access and thermal planning.
OEM Part Number: SFP1G-ZX120-55HT Part Number: SFP1G-ZX120-55
Product Highlights
- Compatible alternative to Extreme SFP1G-ZX120-55
- 1G connectivity at 1.25Gbps
- Optical wavelength: 1550nm
- Specified reach: 120km
- Duplex LC / SMF interface
- Operating temperature: 0 to 70°C (32 to 158°F)
- Factory compatibility verification and optical performance testing before shipment
Specifications
| Compatible | Extreme |
|---|---|
| Manufacturer | HT |
| HT Part Number | SFP1G-ZX120-55 |
| Form Factor | SFP |
| Max. Data Rate | 1.25Gbps |
| Wavelength | 1550nm |
| Max. Cable Distance | 120km |
| Connector | Duplex LC |
| Optical Components | DFB 1550nm |
| Media | SMF |
| DOM Support | Yes |
| TX Power | 0~5dBm |
| Receiver Sensitivity | < -32dBm |
| Commercial Temperature Range | 0 to 70°C (32 to 158°F) |
| Protocols | SFF-8472 MSA Compliant, IEEE 802.3ah-2004 |
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 1G interface configuration must match the remote equipment; sharing a SFP housing alone does not make two transceiver types interoperable.
Wavelength-selective links require the exact channel plan at both ends. Confirm that filters pass 1550nm, then include their insertion loss in the 120km power budget. A nearby channel is not a substitute for the specified wavelength.
Quality Assurance and Packaging
Each SFP1G-ZX120-55 compatible module is inspected, powered up and functionally checked before protective packing. Dust caps and individual trays shield the interface during transport. Customer references, rack groups and project packing lists can be added for volume orders.
Optical Acceptance, Diagnostics and Handling
For this model, the specified transmit-power range is 0~5dBm; receiver sensitivity is < -32dBm. During commissioning, record the host diagnostic readings after the link has stabilized and compare them with those limits. DOM values are useful operational indicators, but they do not replace calibrated optical measurements when a link is marginal. Investigate unexpected loss through connector inspection, cleaning and a channel measurement before replacing the module. 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.
High-Density Port and Thermal Planning
In a densely populated chassis, connector access and airflow form part of the optical-link design. Confirm that neighboring modules and patch leads leave room for latch operation, and include listed power consumption in the host thermal budget. Assess port density together with fiber management. For this model, the principal parameters are data rate 1.25Gbps, wavelength 1550nm, rated reach 120km.
Ordering Information
Use SFP1G-ZX120-55 as the compatibility cross-reference and SFP1G-ZX120-55 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.
Extreme Compatibility and Factory Testing
Factory verification starts with the expected SFP1G-ZX120-55 identity and finishes with an operating host link. EEPROM data, diagnostic visibility and the stated optical parameters are assessed together. Equipment model, hardware revision and software release can be reviewed before dispatch where platform behavior is uncertain.
Frequently Asked Questions
Is this an original Extreme transceiver?
No. It is an HT-manufactured compatible alternative for equipment that specifies SFP1G-ZX120-55, not an original Extreme-branded module.
Which fiber and connector are required?
Use Duplex LC with SMF. The specified maximum reach is 120km, 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.
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.
