Specifications

EASTAR UHP-1000 SERIES SATELLITE ROUTER
INSTALLATION AND OPERATION MANUAL, V. 2.3
(SW VERSION 2.2.9)
© ROMANTIS 2010 30 www.romantis.com
mode – i.e. with reference to maximum of your carrier on the other end of the link.
2.6 Burst demodulator
Burst demodulator router is purposed to receive collective TDMA satellite channels, sent by
other routers.
This demodulator is used at the Central Station (Hub) for receiving Inroute (return)
channels from network terminals. One burst demodulator supports reception of single TDMA
channel. The required number of Inroute channels supported by Hub formed by cascading a
respective number of satellite routers.
TDM/TDMA terminals with activated Half Mesh mode also use a burst demodulator to
interact with other Hal Mesh network terminals in one satellite hop and without transit via
Hub. In this mode, the network may have any topology (e.g. star of stars, partly meshed,
fully meshed and etc.).
Also, the burst demodulator is used in Full Meshed TDMA networks for receiving a common
collective network carrier.
Satellite terminals with activated Burst Demodulator have to be equipped with PLL LNB
convertors instead of low-stable DRO LNB. Also, the link budget of such network has to
ensure that TDMA carrier is properly received by all network terminals with activated burst
demodulator.
The burst demodulator is disabled in the basic configuration of the router. The respective
software activation key is necessary to enable the burst demodulator. Please refer to
respective addendums to this manual for further details about operations of the burst
demodulator.
2.7 Modulator
UHP-1000 router modulator is designed to form carriers to transmit IP-packets and service
information. The modulator can operate in two basic modes – continuous (SCPC) when
channel is transmitted in physical (but not logical) DVB-S format and burst transmitting
short (0.5 – 20 ms) bursts with information coded in the generic protocol. Connected to the
modulator output connector is a satellite transmitter (BUC) or via IF combiner if BUC is
shared by several systems.
Table 5 Modulator parameters
Parameter
SCPC
Outroute/Hub
Remote
modulator frequency
user
user
auto
modulator symrate
user
user
auto
modulator FEC
user
user
auto
modulator inversion
user
user
user
modulator level
user
user
user
modulator tx
user
user
user
modulator power
user
user
user
modulator reference
user
user
user
modulator tlc mode
user
user
user
modulator tlc range
user
user
user
The modulator can generate 10 MHz reference signal for the transmitter synchronization,
and supply 24 VDC with the current of up to 2 A. When switching such signals it essential
that the following be taken into account:
10 MHZ REFERENCE SIGNAL SHOULD BE GENERATED ONLY BY ONE SOURCE IN THE CABLE
SYSTEM. TWO SIGNAL ARE SUPERIMPOSED THUS LEADING TO PERIODIC FADING AND HENCE
TO COMMUNICATION FAILURES.