Installation and Reference Guide
100G QSFP28 Modules
The types/models of 100G QSFP28 modules are being updated. If more accurate models of the module are
required, please contact Ruijie marketing staff or technical support engineers.
Module Specifications
Wavelength
Wavelength means the wave band for transmission of light signal.
Optical Fiber Type
Optical fibers are classified into two types: single-mode and multimode fibers according to the transmission mode of light
in fibers.
A multimode fiber (MMF) has a larger core and can transmit light of various modes. But it has a higher modal dispersion.
The modal dispersion grows with the increase of transmission distance. The transmission distance of multimode fibers is
associated with the transmission rate, core diameter, and modal bandwidth. Please read the instructions for reference.
A single-mode fiber (SMF) has a smaller core and can transmit one mode of light. Therefore, it has a lower modal
dispersion and is applicable to remote communication.
Connector Type
Optical fibers are joined by optical fiber connectors to form fiber patch cord. A fiber patch cord is connected to optical
modules through an optical fiber connector, so that the optical channel is detachable for the convenience of debugging
and maintenance of optical system. The 100G QSFP28 optical fiber connectors have many types. You can select one to
fit the interface type of your optical module. Generally, the 100G QSFP28 optical fiber connectors have the following
types.
Patch cords for the 100G-QSFP-SR-MM850 module
The 100G-QSFP-SR-MM850 module can be used with multi-mode female MPO connectors only. The coupling end face
of the MPO connectors is the physical contact (PC) or ultra physical contact (UPC) patch cord, of which the core wires
must be multi-mode. Twelve channels can be used. Only 8 among the 12 MPO patch cords are recommended to be
applied, namely, Tx1-Tx4 and Rx1-Rx4.
Figure 6-3 Single-Row 12-Fiber Female MPO Connector
Figure 6-4 Male and Female MPO Connectors
