Overview
This is a high-performance 25GBASE-BX BiDi SFP28 transceiver, designed as a fully compatible alternative to the Cisco SFP-25GBX-U-20. This “Upstream” module is a key component for next-generation networks. Specifically, it transmits on the 1270nm wavelength and receives on 1330nm. As a result, it enables 25Gbps data rates over a single strand of fiber. This capability makes it an ideal solution for upgrading network capacity without the significant cost of laying additional fiber optic cables.
Key Features
- 25G Bi-Directional (BiDi) Link: Employs WDM technology to transmit and receive on different wavelengths over a single fiber, thereby maximizing your fiber plant’s efficiency.
- Upstream Configuration: Designed as the “U” module in a BiDi pair, transmitting at 1270nm and receiving at 1330nm.
- 20km Reach: Delivers high-speed 25Gbps connectivity for mid-range links up to 20 kilometers on single-mode fiber.
- Guaranteed Compatibility: Functions as a seamless, plug-and-play replacement for the Cisco SFP-25GBX-U-20 in SFP28 ports.
- Digital Optical Monitoring (DOM): In addition, it provides real-time monitoring of key operational parameters for easier network troubleshooting and maintenance.
- Simplex LC Connector: Features a standard single LC connector for simplified cabling.
Applications
The high bandwidth and single-fiber operation of this module make it essential for modern, high-density network applications. For example, it is perfectly suited for:
- 5G and LTE Wireless Network Fronthaul (CPRI/eCPRI)
- High-Speed Data Center Interconnects (DCI)
- Enterprise Core and Aggregation Layer Upgrades
- Fiber-to-the-X (FTTX) Deployments
- Cloud and High-Performance Computing (HPC) Networks
Specifications
| Parameter | Value |
|---|---|
| Compatibility | Cisco SFP-25GBX-U-20 |
| Form Factor | SFP28 |
| Protocol | 25GBASE-BX (BiDi) |
| Max Data Rate | 25.78 Gbps |
| Wavelength | TX: 1270nm / RX: 1330nm |
| Max Cable Distance | 20km |
| Connector | Simplex LC/UPC |
| Fiber Type | Single-Mode Fiber (SMF) |
| Transmitter Type | DFB |
| Receiver Type | APD |
| DOM Support | Yes |
| Commercial Temperature Range | 0 to 70°C (32 to 158°F) |
| Protocols | SFF-8472, SFF-8431, SFF-8432, IEEE 802.3cc, RoHS Compliant |
Cross-Platform Compatibility
In addition to being a perfect alternative for the Cisco SFP-25GBX-U-20, this versatile module is engineered based on Multi-Source Agreement (MSA) standards. For this reason, it offers broad interoperability with a wide range of equipment from other major manufacturers. Below is a list of potential equivalent part numbers this module can replace:
| Manufacturer | Equivalent Part Number |
|---|---|
| Juniper | JNP-SFP-25G-BX-U-20 |
| Arista | SFP-25G-BXU-20 |
| MSA Generic | SFP-25G-BX20-U |
Note: This is an upstream (U) module and must be paired with a downstream (D) module, such as the SFP-25GBX-D-20, on the opposite end of the link.
Advantages
By implementing this compatible 25G BiDi module, you unlock significant network benefits. First and foremost, you avoid the high capital expenditure of deploying new fiber. Secondly, you can seamlessly upgrade your existing 10G links to 25G, boosting performance dramatically. Moreover, you achieve substantial cost savings compared to expensive OEM transceivers. Ultimately, this gives your organization the flexibility to build a faster, more efficient, and future-proof network without being constrained by vendor-specific hardware.
FAQ (Technical & Product Questions)
1. What is the difference between SFP+ and SFP28?
SFP+ and SFP28 share the same physical form factor, but SFP28 supports much higher speeds. While SFP+ is designed for 10Gbps, SFP28 is an enhanced version capable of handling 25Gbps per lane. Therefore, an SFP28 module like this one can provide 2.5 times the bandwidth of an SFP+ module, making it ideal for modern high-speed networks.
2. Why is a “U” (Upstream) module necessary?
A “U” or Upstream module is essential for a BiDi link to function. It transmits on one wavelength (1270nm) and receives on another (1330nm). It must be paired with a “D” (Downstream) module at the other end, which does the opposite. Consequently, this matched pairing allows data to flow in both directions over a single fiber strand.
3. Can I use this SFP28 module in a 10G SFP+ port?
Compatibility depends on the host device. Many modern switches with SFP28 ports can auto-negotiate down to 10G when an SFP+ module is inserted. However, this SFP28 module is designed to operate at 25G. While it might be recognized in some SFP+ ports, it will not function or link at 10G. It must be used in an SFP28 port configured for 25G.
4. What is 5G fronthaul and why is 25G BiDi used for it?
5G fronthaul is the connection between the baseband unit (BBU) and the remote radio head (RRH) in a cellular network. This connection requires very high bandwidth and low latency. 25G BiDi is ideal because it provides the necessary speed over a single fiber. This is crucial as cell towers often have a limited number of available fibers, making BiDi a cost-effective solution.
5. Do I need a specific type of fiber patch cord for this module?
Yes, you need a specific type of cable. This module requires a single-mode fiber (SMF) patch cord. Furthermore, because it uses a single optical port for both sending and receiving, the cable must have a simplex LC connector on each end. Using a duplex cable or multi-mode fiber will not work.
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