User's Manual
DMR_Manager Operating Manual 2011/07/04 Version 1v2
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Page 7 of 51
Remote control service can be performed through an Ethernet connection pre-existing in the site, or through
GPRS modem which can be integrated into the station, or through the radio channel and another Radio
Activity station.
Fully modular structure allows to best configure the radio equipment, by adding and/or changing the required
HW and SW functional blocks, to work as simple repeater, multi-frequency multi-site repeater, single-
frequency multi-site repeater.
2
2
.
.
3
3
N
N
E
E
T
T
W
W
O
O
R
R
K
K
It is possible to configure the network in many different ways, with different kinds of links (Ethernet, RF,
Optical fibers)
2.3.1 MASTER BASE STATION IN “RF LINKED” NETWO RKS
The master base station is equipped with a “voting system”, which select the “best” signal among all the
signals received by the Satellites and the local receiver(s).
Besides this the master sends the digital synchronization towards the satellites and, in the case of Base
Stations “RF linked” equalizes the absolute and group delay due to the RF channel.
2.3.2 SATELLITE BASE STATION IN “RF LINKED” NETWORKS
The duty of the Satellite is:
∞ receiving the signals from the terminals and sending them to the Master through the RF link,
∞ transmitting to the terminals the signals received by the Master (voted) through the RF link.
The satellite performs also the group delay and absolute delay equalization on broadcasting transceivers both
down link and up link.
2
2
.
.
4
4
S
S
I
I
M
M
U
U
L
L
C
C
A
A
S
S
T
T
N
N
E
E
T
T
W
W
O
O
R
R
K
K
S
S
Simulcast type networks operate on the same radio channel on the whole coverage area.
Communications can be both open and selective channel, semiduplex mode between mobile terminals or
duplex mode between Central and terminals. The network will make the automatic selection of accessing
terminals and will broadcast the signal on the same frequency throughout the coverage area. The terminals
are served regardless of their position as if they were covered by a single repeater.
All transmitters send the same information signals
on the same carrier frequency
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