Huawei B311s-220 Guia De Inicio Rapido página 9

Installing external antenna
In addition to the build-in antenna designed to satisfy your basic needs,
you can also install external antenna to the router to improve signal
reception. Please contact your carrier to purchase the antenna.
Note:
Turn off the router and unplug the power adapter before installing

any external antenna.
External antenna is only suitable for indoor use. Do not use

external antenna during thunderstorms.
Only use external antenna provided by your carrier.

1 2
7