User's Manual

3CC12425AAAA TQ BJA 01 Issue 01 - April 2001 - Draft 03 51/70
52
6.4 – Adding an additional NT to a TS site
When a Terminal Station is installed, and an additional NT is expected to be required in the future, the
cabling on the site can be pre-wired with a splitter. One port of the splitter is connected to an NT, and a
75 ohm termination load is connected to the other port. By removing the termination load and connecting
an additional NT in its place, an additional NT can be added without interrupting traffic on the original NT.
If a Terminal Station is not pre-wired to accept an additional NT, cables must be disconnected, cable
lengths adjusted, and a splitter added. The original NT is unable to pass traffic during the installation of
an additional NT.
6.4.1 – Case of a pre-wired installation
In the case of a pre-wired installation, the cables are already pulled, the distribution frames and splitter
are already in place and there is a 75 ohm termination load on the spare splitter port.
To add an NT to a pre-wired TS site (see § 2.5 – Examples of configuration of the Terminal Station
(7390TS)):
– remove the 75 ohm termination load,
– connect the NT in place of the 75 ohm termination load,
– follow the procedure for adding an NT described in § 6.1 – Declaration, deletion, reset of an NT.
Note: There is no service interruption and, furthermore, it is not necessary to reconfigure the radio
parameters of the X-Pol RT.
6.4.2 – Case of a non-pre-wired installation
In a non-pre-wired installation,
– turn off the power to the existing NT
– install and connect the splitter and distribution frames, and adjust the cable lengths if required.
– follow the procedure for adding an NT described in § 6.1 – Declaration, deletion, reset of an NT,
– reconfigure the X-Pol RT radio parameters.
Note: You are recommended, with a view to possible future Multi-NT use, to wire as for Multi-NT on
first installation. This means that it will not be necessary to reset the X-Pol RT, so avoiding the
interruption of services.
6.5 – To asign an NT to an alternate BS
To assign a Terminal Station to on alternate Base Station:
– delete the NT in the BS with the 7390LT software (cf. § 6.1 – Declaration, deletion, reset of an NT),
– declare the NT in the new BS with the 7390LT software,
– turn off the power to the NT unit,
– allign the Terminal Station X-Pol RT to the new Base Station. Refer to Chapter 3 – Installation of
the X-Pol RT’s A7390 Terminal Station for information.