Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 275)

T400 Controller Facilities Manual

667/EB/20200/000 Page 25-4 Issue 9

25.1.2 PHYSICAL DESCRIPTION

25.1.2(a) Mechanical Construction

The PCB is located within the T400 PCB Module, along side the other T400 Logic

PCB’s. It interfaces to the T400 Main Processor PCB via the Extended System Bus

ribbon cable, in a similar way to the existing SDE/SA PCB.

25.1.2(b) Current Sensors & Voltage Monitor

There is a connector on the PCB to allow connection of the current sensors and a

voltage monitor which are used for Lamp Monitoring.

25.1.2(c) Telephone Line Interface (OTU)

There is a BT style Jack provided to allow 2 or 4 wire leased line connection, when

used as an integral OTU.

25.1.2(d) Test Jack Sockets (OTU)

A Jack socket is provided to allow connection of a TC12 Instation Test Set, for use in

UTC systems. This permits monitoring of line levels and communication data during

installation and maintenance etc.

25.1.3 ANCILLARY PROCESSOR PCB ELECTRONICS

The Ancillary Processor PCB is based on the Intel 80188 microprocessor, which is the

same processor as used on the T400 Main Processor PCB. Please refer to Figure 25.1

for a functional block diagram of the Ancillary Processor PCB.

The peripherals to the processor are the:

Firmware PROM

RAM (battery supported)

Shared RAM (‘shared’ with the T400 main processor)

A to D Converter with Analogue Multiplexer

Serial Interface (USART) with integral Modem and Line Interface

Watchdog Monitor Facility

Status LED Indicators

Note that there is no configuration prom on this PCB as all the data is obtained from

the T400 configuration prom.

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Siemens EH.75M.11. Especificaciones Pagina 275