Alpha Microsystems AM-90 Manuale di istruzioni per l'installazione - Pagina 4

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INTRODUCTION

The AM-90 Lightning Board is a compact circuit card assembly that provides four RJ-45 ports and built-

in protection against lightning damage for the Eagle family of systems. It gets its name from its built-in

surge protection feature. An array of transient absorption zener diodes mounted on the board guards

against voltage surges caused by lightning strikes and other damaging transient electrical fluctuations.

The AM-90 mounts between your current I/O board (AM-314, AM-318, or AM-137) and your

computer's back panel, and provides four serial ports with RJ-45 connectors, eliminating the need for

cluster cables.

About the AM-90 Board

The AM-90 is a compact circuit board assembly approximately 3¼" wide, 2½" deep, and ¾" high

(83mm x 64mm x 20mm) that mounts on your computer's back panel. It provides:

• Built-in surge protection implemented by an on-board array of transient absorption diodes

(TAZD). If an over-voltage condition occurs (voltages above 27 volts at up to 600 watts), these

diodes divert the flow of current away from sensitive I/O circuitry. With an AM-90 board, a

properly grounded system should withstand power surges without damage.

• Four RS-232 serial ports with 8-wire RJ-45 connectors compatible with the pinouts on the AM-

359 board and Super Eagle system, thus standardizing the RS-232 pinouts for all Alpha Micro

I/O boards. This interconnect board protects all modem and flow control signals (except when

connected to an AM-318 I/O board, which does not support full modem control).

AM-90 Board Layout

RJ-45 PORTS

PIN 1

PLUG IN FROM AM-318-00 HERE

(present only on -02 thru -04 versions)

PDI-00090-00, Rev. A02

D10

D11

D12

AM314

AM137

AM138

AM-90 Lightning Board

D13

D19

D14

D20

D15

D21

PLUG IN FROM AM-137,

D16

D22

AM-138, AM-301, AM-314,

OR AM-318-10 HERE.

D17

D23

D18

D24

PORT #

PIN 1