1.1       Focus

This instruction describes the E2000 modules.

1.2       Overview

The E2000 is a modular 19 inch 3U hardware based system. The encoding is performed by a 8 bit ZWorld Rabbit processor module running at 44MHz.

From a black box perspective it has 8 serial port inputs running TNPP (TMP specific) as the messaging protocol, and two analogue outputs producing signalling and modems tones in the POCSAG format.

Inside the black box the TMP packets are queued, batched together based on a complex set of rules, and converted to POCSAG code suitable for transmission to a radio distribution system or wire line based device.

What makes this encoder different to most is the batching process is performed just prior and during transmission. This provides a very dynamic batching system allowing messages to be prioritised based on time in the queue, priority flags, functionality, baud rate and finally redundancy where two systems share the same network.

 

 

 

1.3       Modules

The E2000 has subdivided the tasks it performs across 3 hardware modules and it connects to the outside world by 2 hardware modules.

The modules of the E2000 are

1.     E2001 Power Supply Unit

   This unit takes 240 Volts Input and converts it to 12Volts 4Amps DC via a switch mode power supply. The unit is protected by MOVs and fuses.

   E2001 Hardware Description

    

2.     E2050 Processor Card

   This is the main processing unit. All 6 serial ports are on this card. 4 are used for TNPP packets, one is for communication to the encoder, 1 is for the debug monitor and PPEViewer communication.

   E2050 Hardware Description

   E2050 Software Description

   1. E2050 Program Description   This page contains flow diagrams for the E2050 Central Processor.

   2. Revision List   This page contains the complete revision list for all software changes to the E2050 Central Processor.

    

3.     E2004 POCSAG Encoder Card

   The Encoder card takes the POCSAG word (32bits) stream and converts it to a synchronous POCSAG bit stream. It handshakes using RTS/CTS to the E2019 Modem card.

   E2004 Hardware Description

    

4.     E2005 POCSAG Encoder Card with Asynchronous Serial Output

   The Encoder card takes the POCSAG word (32bits) stream and converts it to a synchronous POCSAG bit stream. It also provides a synchronous serial data stream of the output.

   E2005 Hardware Description

    

5.     E2019 FSK/PURC Modem Card

   The FSK card generates PURC control tones as well as the Bell202 Modem tones for communication to wire line networks and link radios. It performs handshake to the channel network.

   E2019 Hardware Description

    

6.     E2051 Back Plane

   Simply connects the cards together and also provides audio buffering and summing to the external networks.

   E2051 Hardware Description

    

7.     E2052 Interconnect Card

   Provides all connections to the external devices. All connections, DC and AC power, RS232 signals and analogue outputs are via this board.

   E2052 Hardware Description

    

The next diagram shows how the cards interconnect to form the E2000 system.

There are two layers of isolation embedded into the E2000. The E2052 is completely isolated from the E2051 and the E2051 is completely isolated from each card in each system. Isolation is achieved using optos in the data and control lines, 600:600 ohm transformers in the audio paths and DC to DC converters for the power.

The main reasons for so much isolation is to reduce RF radiation, minimise RF interference and lightning protection. In a worse case scenario lightning may destroy some components on the interconnect back plane, however it should not reach the cards.

There is additional lightning protection in the power supply with MOVs and on the analogue lines with Gas Discharge Tubes.

 

 

The front of the rack System 1 is shown below with the left card being the E2019 Card. Next to the right is the E2004 card, then the E2050 Card and finally the E2001 card.

The picture below is that of the rear of the E2000. Its shows the separate 240Volt power feeds on the left and right, the 8 serial port RJ45 connectors towards the bottom and various opto-isolation circuitry.

 

[ Home ] [ Up ] [ E2050 Card ] [ Intercard Connections ] [ E2052 Interconnect ] [ E2051 Back Plane ] [ E2019 PURC/FSK ] [ E2005 Async/Sync Encoder ] [ E2004 Encoder ] [ E2001 AC/DC Converter ] [ STC ]  
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Last modified: 01-Jun-2022