User's Manual
Table Of Contents
- Important Safety Instructions
- Overview
- The ERU assembly
- Do you have everything?
- Safety precautions
- Introduction
- Installing the ERU
- Installation overview
- Installation guidelines and requirements
- Estimating cable requirements
- Assembling the mounting bracket and pipe
- Installing the ERU on solid wood or lap siding
- Installing the ERU on brick or poured concrete
- Installing the ERU on a cinder-block or hollow wall
- Installing the ERU under the eaves
- Installing the ERU on a roof
- Attaching the ERU to the mounting assembly
- Routing and grounding the exterior cables
- Routing cable to the SOMAport
- Troubleshooting

34
External Radio Unit Installation Guide
Tools and materials
Make sure you have the following items on hand before you begin.
To install the ERU on brick or poured concrete
1
Hold the mounting bracket-and-pipe assembly in position on the mounting
surface.
2
Use a level to verify that the center line of the mounting bracket is perfectly
vertical.
3
Use a pencil or a piece of chalk to mark the position of the four holes that are
located in the four corners of the mounting bracket.
4
Remove the mounting bracket-and-pipe assembly.
5
Drill a 1/2-inch hole in each of the locations you marked.
6
Insert a double-expansion anchor in each hole.
Materials Tools
Four B4015 or equivalent double-expansion
anchors
Electric drill with a 1/2-inch masonry bit
Four 1/4-inch -20 x 3-inch machine screws Carpenter’s level
Screwdriver
Hammer
11-mm (7/16-inch) open-end or box-end
wrench or a small adjustable wrench
Pencil or chalk