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4. COMPONENTS

4.1. PBX INTERFACE (PI)

Figure

4 - PBX Interface

4.1.1. PI Component Description

The PI is a multiprocessor system consisting of a general purpose microcomputer board in slot 1 and multiple

microprocessor-based intelligent serial communications controllers. These microcomputer boards communicate over an

industry standard VME bus backplane. The PI also includes mass storage devices. Slot 2 will be left open and slot 3 will be

used for PRI-48/-64. Slot 4 will be used for the Multisite Interface Controller.

4.1.1.1. PBX Interface Controller (PIC)

Using the 68030 microprocessor, the PIC is a general purpose computing board that provides typical computer peripheral

interfaces for the PI. These include disk facilities through a Small Computer Systems

Interface (SCSI) bus, a Centronics

parallel printer connection, IEEE 802.3, and four serial port interfaces for ASCII terminals. The PI does not use the IEEE

802.3 local area network interface during normal operation, and serial port 1 is used for the PI terminal, while port 2 is used

for a diagnostics terminal.

In addition to servicing the PI peripherals, the PIC is the central point through which the PRI and Multisite Interface

Controller (MIC) boards pass messages. Also, during the startup phase, the PIC reads the configuration files and loads

application software and configuration parameters onto other processor boards in the system. Finally, the PIC processes

commands from the PI terminal. This board must be in slot 1.

P2 Adapter Board

The P2 Adapter board is a small circuit board that routes the PIC I/O signals and grounds from its concentrated VME

bus backplane connector (P2) to the 712M transition module. The board plugs directly onto the rear of the backplane and has

two mass termination connectors. Two ribbon cables carry the I/O signals from these connectors to the transition module.

Also, the P2 has sockets for SCSI terminating resistors if the SCSI interface of the MVME147 is at the end of the SCSI bus.

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Ericsson LBI-39001 Betreibershandbuch Seite 28