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PI HARDWARE LBI-39040

2. PI HARDWARE

This section provides a general description of the hardware of the PI. The figure below shows the architecture of the PI.

Figure 1 - PI Architecture

PI Component Description

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

microprocessor-based intelligent serial communications controllers which communicate over an industry standard VMEbus

backplane. Slot 2 is left open, slot 3 is used for the Multisite Interface Controller (MIC), and slot 4 is used for a Primary Rate

Interface (PRI) PRI-48 or a PRI-64. The PI also includes mass storage devices.

PI Controller

Using a 68030 microprocessor, the PI Controller (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 Ethernet connector, and four serial port interfaces. The PI

administration can occur over the IEEE 802.3 local area network interface or over serial port 1. Serial port 2 is used as a

debug terminal and serial port 3 is unused. Serial port 4 is used for the System Manager.

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 VMEbus

backplane connector (P2) to the TVME-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 TVME-147 is at the end of the SCSI bus.

MIC PRIPIC

VMEbus

T1/E1

ISDN

T1/E1

Control

(RS-422)

Hard Drive Floppy Drive

6-Wire

Administrative

Terminal

RS-232

To MUX

To MD110

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Ericsson LBI-39001 Bedienungsanleitung Seite 7