Installation and Reference Guide
40G QSFP+ Modules
Figure 5-9 Dual-core LC Connector
For devices supporting splitting 40G into 4 *10G, you can use MPO-4*LC fiber patch cords to convert 40G to 4 *10G.
Figure 5-10 MPO-4*LC Fibers
DDM
Digital Diagnostic Monitor (DDM) is widely used in optical modules to dynamically measure the temperature, intensity of
transmitted and received light, voltage, and laser bias current of the module. You can run commands to get the monitoring
result on the host system that supports display of DDM information. Different 40G optical modules support different testing
items of DDM. Please refer to the instructions on the specific module model.
Intensity of Transmitted Light
Intensity of transmitted light refers to the optical output power transmitted from the optical module. The unit is dBm.
Intensity of Received Light
Intensity of received light refers to the optical input power received by the optical module. The unit is dBm. Before
connecting optical modules, please pay attention to the specification of received light intensity. If the actual received light
intensity is less than the minimum value, the module may fail in connection or lose many frames. If the actual received
light intensity is greater than the maximum value, the module may be damaged.
Module Installation Precautions
Preparation before Installation
Before installation, electron static discharge (ESD) protection is needed. To avoid damage to the QSFP + modules and
electronic devices in the equipment by the static electricity generated during the installation, please set the anti-static wrist
strap on the wrist and tighten the lock; make sure that the anti-static wrist strap has a good contact with the skin and is
well grounded.
Wearing jack type anti-static wrist strap, for example, is as shown in Figure 5-11:
Figure 5-11 Schematic Diagram for Wearing Jack Type Anti-static Wrist Strap
