Optical transceiver
HPE 845398-B21
- Product description: HPE 845398-B21_SFP28 25GB SR 850nm 100m DOM Duplex LC/UPC MMF_Liyuan Tech
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Manufacturer: HPE
Part Number: 845398-B21
Form Type: SFP28
Speed: 25GB
Reach: 100M
Wavelength: 850nm
Media: MMF
Connector: Duplex LC
DDM/DOM: Supported
Speed Description: 25-Gigabit
Transmitter Type: VCSEL
Receiver Type: PIN
Product Detailed Description
1. Brand and Model (HPE 845398-B21):
HPE: Hewlett Packard Enterprise, representing an original factory-certified product specifically designed for HPE servers, switches, storage, etc. in the network equipment. It ensures optimal compatibility and stability.
845398-B21: HPE's specific part number for procurement and identification.
2. Physical Specifications (SFP28):
This is an upgraded version of SFP+. SFP+ supports a maximum rate of 10 Gbps, while SFP28 supports a maximum rate of 25 Gbps. Its physical size is the same as SFP+,
thus it can be compatible with most SFP+ ports (but the SFP28 module inserted into an SFP+ port usually can only operate at 10 Gbps).
3. Rate and Type (25G SR):
25G: The transmission rate is 25 gigabits per second (25 Gbps).
SR: Short-distance transmission. This is an interface type defined by the IEEE 802.3by standard for multi-mode optical fibers.
4. Wavelength and Fiber Type (850nm MMF):
850nm: The working wavelength when using multi-mode optical fiber.
MMF: Multi-mode optical fiber. This type of fiber has a thicker core, allowing multiple modes of optical signals to be transmitted,
but the transmission distance is shorter and the cost is lower. It is opposite to single-mode optical fiber (SMF).
5. Transmission Distance (100m):
When using high-quality multi-mode optical fiber following the OM4 standard, the maximum transmission distance can reach 100 meters.
If using a slightly older OM3 multi-mode optical fiber, the distance is usually about 70 meters.
6. Diagnostic Function (DOM): Digital Optical Monitoring. This is a very important function that allows network administrators to monitor the working status of the optical module in real time,
such as: output/input optical power, supply voltage, laser bias current, module operating temperature.
These parameters can be viewed through the network management system (such as HPE Comware/Cisco IOS, etc.), facilitating fault diagnosis and network health check.
7. Interface Type (Duplex LC/UPC):
Duplex: Duplex means two optical fibers (one for sending and one for receiving) are required to complete bidirectional communication.
LC: The most mainstream small fiber connector type at present, smaller than the old SC connector.
UPC: Refers to the polishing method of the fiber end face (super physical contact), this processing method has lower reflection loss and is commonly used in multi-mode and short-distance single-mode applications.
Summary Description: HPE 845398-B21 is an original factory-certified short-distance optical module that supports a 25 Gbps rate, uses an 850 nm wavelength,
transmits through multi-mode optical fiber with a maximum distance of 100 meters, has an LC interface and digital monitoring function.
Usage Scenarios: This optical module is mainly used for short-distance internal connections in data centers that require high bandwidth and low latency. Specific applications include:
1. High-speed connection from server to switch (most common):
Connect HPE servers (such as HPE ProLiant Gen10/Gen11, Synergy, Apollo, etc.) equipped with 25G NIC to 25G switch ports. This is its core application scenario, used to enhance the server access bandwidth in the data center.
2. Links in the spine-leaf network architecture:
In the interconnection of spine (core) and leaf (access) switches in modern data centers, 25G is a very popular downstream link rate.
This SR module can be used to connect leaf switches to spine switches, or to connect servers to leaf switches within the same rack.
3. Storage Area Network:
Connects HPE storage devices (such as HPE Primera, 3PAR, Nimble Storage) to switches, providing high-speed 25G connections for the storage network to meet the requirements of large data transmission.
4. Interconnection of Network Devices:
Used for short-distance interconnection between switches, such as within the same building or between adjacent cabinets.
In addition to HPE 845398-B21 , Liyuan Tech supply a wide range of other Optical transceiver transceivers. If you have any need or interest, please feel free to send inquiry to global@chn-liyuan.com
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