Shyam DB6M Series, Operation & Installation Manual

Page: 9 / 43

. Page
All Rights Reserved Shyam Telecom Limited 9/43
Next Generation
Signal Enhancement
Systems (BSS) equipment specification: Part 4: Repeaters.
[3] ETS 300 342-3
Radio Equipment and Systems (RES); Electro-Magnetic Compatibility
(EMC) for European Digital Cellular Telecommunications Systems. Base
Station Radio and ancillary equipment and Repeaters meeting phase 2
GSM requirements.
4.5. G
eneral
M
obile
C
ommunications
S
ystems are planned as cellular systems and each
cell of the base station is required to provide
RF
coverage over a certain
geographical area as per defined
RF
power levels.
D
ue to the
RF
propagation properties, even using high radiated
RF
powers or complicated
antenna systems, there are zones within the coverage area where the
RF
signal strength from base station remains inadequate for establishing the
desired connectivity to mobile users.
R
epeaters traditionally are deployed in the
M
obile
C
ommunication
N
etwork
to fill in the
“D
ead
Z
ones
”
caused by blocking of signals by geographic
topologies such as mountains, valleys, dense foliage, high rising urban
landscapes and other man-made structures.
T
he distance from the base
station also adversely affects the
RF
signal strength.
T
he user views
repeaters as a means to extend base station coverage so as to reduce the
number of base stations and thereby accelerate network availability.
R
epeater systems are installed after meticulous planning between
BTS
s and
the mobile users to provide
RF
coverage in the shadowed regions.
R
epeater
systems are available for different applications and ultimate choice shall
depend on some of the factors mentioned below:
•
A
rea to be provided with coverage.
•
I
ndoor/outdoor coverage.
•
A
vailability of
BTS
s in the vicinity.
•
A
ntenna isolation to be achieved.
5. F
unctional
D
escription of
DB6M D
ual
B
and
R
epeater
5.1. G
eneral
D
escription
The
DB6M
dual band modular
R
epeater
S
ystem is designed to provide
outdoor coverage and can handle signals in up to six sub bands maximum
with
3+3
configuration or as per requirement in two of the service bands,
used around the
W
orld by various service operators.
I
t provides highly
selective amplification in the pre-set frequency bands.
T
he details of
operating service frequency bands are given below:
SNo Service Band DL Frequency (MHz) UL Frequency (MHz)