User Manual

Page

Next Generation

Signal Enhancement

9. System Maintenance

9.1. General

The system normally operates without any operator intervention or

maintenance. If, in the unlikely event of a unit failure, the field replaceable

units (antenna unit, cables) should be checked for faults and the system

restored. A failed unit can be removed and replaced with a spare while the

rest of the system (other repeaters) is still operating. Soldering or local

repair of the modules should be avoided from better maintenance point of

view. Faulty module/unit should be replaced with genuine spares only.

However, the power supply of the failed repeater should be isolated from

AC mains and DC power before any module is replaced. In the event of a

system malfunction, the status of the antenna systems should be checked

as well as the continuity of the cabling before replacing any modules within

the repeater.

9.2. Preventative Maintenance

The R20 repeater does not require any preventative maintenance.

9.3. In-Building Coverage Problems

If the coverage area appears to be smaller than the installation site plan,

there are only a few possibilities that limit the signal level in the area.

I) Physical obstructions degrading the signal level – Visually inspect

the area of weak coverage. If possible, rearrange objects that may be

interfering with the signal path. Pay particular attention to large metallic

objects that reflect or block the signals to the weak coverage area. If

weak coverage area still persists, check the following:

a. Inspect the indoor RF coaxial cable and its connection with

connector

b. Indoor antenna direction and its tilting

c. R20 repeater gain setting

II) Defective Indoor coaxial cable/Antenna – Check the RF coaxial cable

and antenna. If necessary, replace each individually with a known

functional unit, and verify the respective signal level. This can be

achieved by observing the signal strength indicator on a mobile

handset that has an unobstructed line-of-sight view, 15 – 20 feet (4 – 5

m) from the indoor antenna. If the signal level increases at this test

location, re-verify the signal level in the weak coverage area. If the

signal level remains marginal, inspect the R20 unit.

III) R20 Defective – Replace the R20 unit with a known operational unit.

Verify the signal level at the unobstructed test location. If the signal

level increases, re-verify the weak coverage area. If the weak

coverage area remains marginal, an additional indoor antenna or R20