User's Manual

20/70 Issue 01 - April 2001 - Draft 03 3CC12425AAAA TQ BJA 01
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2.4 – Description of the Terminal Station (7390TS)
The A7390 system Terminal Station (7390TS) consists of the following main elements:
– an external transceiver "X-Pol RT";
– one or two indoor units for user connection (NT);
– IF coaxial cable linking the X-Pol RT and NT (NT/X-Pol RT link);
– one lightning arrester installed on the NT/X-Pol RT link cable;
– one IGAU installed on the NT/X-Pol RT link cable before the splitter module;
– depending on the configurations, on splitter module.
The figure below shows the three typical Terminal Station Installation types: Single NT, Dual NT, and
Single NT pre-wired for an additional NT.
Figure 3 – Terminal Station Installation example
Downlink : 14 MHz Trafic MIX: circuit capacity
Uplink : 4 x 3.5 MHz Minimum Medium Maximum
Nb of circuits: 64 kbit/s 0 120 240
ATM uplink capacity (cells/s) 37.647 18.824 0
ATM downlink capacity (cells/s) 38.047 19.934 1.821
OR
OR
X-Pol RT
X-Pol RT
ground wire
«F» connector
Exterior
wall
IF cable Mounting
pole
Mounting pole
ground wire
Weatherproof
caulk
Ground
rod(s)
IGAU
Power utility
entrance
ground
wire
Lightning arrester
with mounting bracket
Copper plate
connected to
the power
utility ground
Mechanically bonded
ground connection
Single NT configuration
Dual NT configuration
NT 1
NT 2
2:1
Combiner/
Splitter
Single NT configuration Pre-wired
for the addition of a seconde NT
NT 1
75 Ohm Termination Load
IGAU
IGAU