Справочник Пользователя для Shyam Telecom Inc. R20-1900
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Next Generation
Signal Enhancement
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.
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.
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
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
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.
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
level increases, re-verify the weak coverage area. If the weak
coverage area remains marginal, an additional indoor antenna or R20