Check Signal Strength
Check your signal quality and using the tables attached to determine your signal strength.
It's important to know that both signal quality and signal strength should be acceptable. A low quality signal can be cause by other interference around the Gateway or router. Improve this by avoiding metal surroundings, other electrical devices being close to the gateway and by installing as high as possible with both antennas being positioned vertically.
Please see the installation guide for full details on installing a gateway.