Karel MS128, Инструкция по установке и обслуживанию

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Karel MS128 Installation & Maintenance Guide
Edition 3.2
9
I.3.B. POWER FAILURE TRANSFER STATIONS
In case of a power failure, the stand-by battery backup allows the system resume
operation without any interrupt. However if there is no battery connected to the
system, then any four lines can be automatically connected to any four extensions
of the system. The power failure transfer stations are handled by four relays
placed on the MS128 CPUKON card.
I.4. CENTRAL PROCESSING MODULE – CPU128 &
CPU CONNECTION CARD - MS128 CPUKON
CPU128 Central Processing Module is located on the leftmost card slot inside the
cabinet. The board is attached to the CPU connector on the BPL128 Backplane
(see Figure A-4) and fixed to the rack top plate via the the latch on the plastic card
cover.
MS128 CPUKON CPU Connection Card resides on the rack top plate below the top
cover of CBN128 Cabinet (see Figure A-3). It is fixed to the rack by a brass card
holder with its screw and two plastic card holders. The MS128 CPUKON card is
connected to the CPU128 board by a 20-pin flat cable, called MS128 CPU-FC. See
the following figure for the outlook of MS128 CPUKON card.
Figure A-6
CPU128 is the brain of the system consisting of the microprocessor, utility,
switching and DTMF circuitries. See Figure A-8 for the location of these circuitries
and Figure A-7 for the operational flow diagram of CPU128.
MS128 CPUKON is the interface between the accessories and the system, it
includes the connectors used to attach the accessories to the system.
CPU128 generates the address and data signals for the MS128 EX1 and MS128
EX2 Expansion Modules and gives them to the BPL128 Backplane, via the 64-pin
connector on BPL128. Then, the signals travel through the BPL128 Backplane to
the MS128 EX1 and MS128 EX2 Expansion Modules. The pin-out of the CPU128
– BPL128 connector on BPL128 Backplane is as follows: