Operation Manual Part 2

Digital Liquid Cooled UHF
TV Equipment
Description / Test points / Location of units
9946 V1
45321648.01 104 A E
preliminary
61 / 131
Numéro / Number Doc. Rev. Lan
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16/06/2006
Pa
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Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON.
3.5. Interconnections Board EMB/UC TX Numerique 45324511
3.5.1. Outline
In addition to housing the transmitter CPU card, this card also acts as an interface between the CPU
card and the other transmitter equipment.
The exciter/CPU interconnection card is an essential part of the transmitter; it provides for the
following:
♦ interconnections for DC, analogue signals and logic data between the exciter(s) and the control
system (Central Processing Unit),
♦ interconnections between the Central Processing Unit (CPU) card and the rest of the transmitter,
♦ interconnections between the Central Processing Unit card on the one hand and the user
interfaces (PCL and remote user interface) together with equipment with connections with systems
external to the transmitter (GPS, modem) on the other,
♦ exciter changeover switching operations.
3.5.1.1. Architecture and operational description
The exciter/CPU interconnection card consists of a mother board and a daughter board.
It houses the CPU card and the following:
♦ internal data buses which provide for data exchange between the various card connectors,
♦ connectors for signal and data interchange with :
• the MODAP unit,
• the RF switcher (Double Drive transmitter),
• the multiplex card,
• the user interfaces,
• external units,
♦ connections between the various card connectors,
♦ connections used to distribute the supply voltages from the very low voltage power supply card of
the Central processing unit to:
• the Central Processing Unit card,
• the Local Control Panel (PCL),
For the most part the mother board contains the connections with the MODAP unit and the daughter
board contains the connections with the rest of the transmitter.
3.5.2. Protection and surveillance devices
The exciter/CPU interconnection card has no need of internal protection and surveillance devices;
nevertheless it incorporates protection devices for the power supplies which feed:
♦ the logic system,
♦ the PCL,
♦ the multiplex card.