Operation Manual Part 2

Digital Liquid Cooled UHF
TV Equipment
Description / Test points / Location of units
9946 V1
45321648.01 104 A E
preliminary
69 / 131
Numéro / Number Doc. Rev. Lan
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16/06/2006
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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.
3.7. Central Processing Unit (CPU-TH860)
3.7.1. Outline
NOTA : The SNMP protocol is described in Annexes.
The Central Processing Unit supervises the running of the transmitter; its principal functions are as
follows :
♦ to monitor and control the various units in the transmitter,
♦ to store the faults in these units together with dates and times,
♦ to control the various interfaces in conjunction with a local or remote operator.
3.7.2. Architecture
The Central Processing Unit is on a double Euro card and contains :
♦ the Central Processing Unit,
♦ an EPROM memory,
♦ an SRAM memory,
♦ a connector for PCMCIA card,
♦ a flash EPROM memory,
♦ 4 timers,
♦ a time and date clock,
♦ an internal configuration port containing 7 jumper straps which can be read by a micro controller,
♦ on/off inputs/outputs,
♦ RS 232 serial link connectors,
♦ one analogue input,
♦ One Ethernet input.
3.7.3. Protection and surveillance devices
The Central Processing Unit has a unit for monitoring the +5 V supply. During switch-on and switch-off
the output buffers wait for their confirmation command from the micro controller before exchanging
data with the external system. These output buffers are disabled as soon as the +5 V voltage supply
rail drops below 4.5 V.