Installation and Reference Guide
10G XFP Modules
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 in the host system that supports display of DDM information.
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. 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 damages to the XFP modules and
electronic devices in the equipment caused by the static electricity generated during the installation, please wear the
anti-static wrist strap around 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 2-4:
Figure 2-4 Schematic Diagram for Wearing Jack Type Anti-static Wrist Strap
