Figure 4-75
Pull out the air filter
Keep the removed air filter and fastening screws properly for future use.
You can clean the air filter with water, but wait until it is completely dry before installing it again.
Installing a Port Lightning Arrester (Optional)
Only 10/100 Mbps RJ-45 Ethernet interfaces need to be equipped with port lightning arresters.
No port lightning arrester is shipped with the router. You can purchase one if needed.
Before connecting an outdoor Ethernet cable to an Ethernet interface, you can install a port
lightning arrester to protect the router against lightning strokes.
The following port lightning arrester can be installed on the device. The specifications for the
port lightning arrester are as follows:
Port protective unit-single port, maximum discharge current (8/20
μ
s waveform): 5 kA, output
voltage (10/700
μ
s waveform): core-core < 40 V, core-ground < 600 V.
Tools
Phillips or flat-blade screwdriver
Multimeter
Diagonal pliers
Installation Procedure
Follow these steps to install a port lightning arrester:
Step1
Use a double-faced adhesive tape to stick the port lightning arrester to the router. The port
lightning arrester should be as close to the grounding screw as possible.
Step2
Cut short the grounding cable of the port lightning arrester according to its distance to the
grounding screw. Then, fix the grounding cable onto the grounding screw of the router.
Step3
Use the multimeter to check the connection between the grounding cable of the port lightning
arrester and the grounding screw of the router.
Step4
Follow the instructions to connect the port lightning arrester with a transit cable. (Note that the
external cable should be connected to the IN end while the transit cable should be connected to
the OUT end.) Check whether the LED on the LPU is normal.
