Console House UDS 4 Mode Specifikace stáhnout pdf (Strana 23)

DESCRIPTION AE/LZB 119 1892 R1A

tions. Of the three (3) internal connectors, two directly mate

with the Audio System Board. These two 96-pin rectangular

DIN-type connectors carry all audio and control signals

between the Audio System Board and the I/O Backplane

Board's externally exposed connectors. The remaining inter-

nal connector provides the dc input connection from the

power supply located under the Audio System Board. As

previously described, the I/O Backplane Board distributes

this dc power to the Audio System Board via DIN intercon-

nections and to the four (4) DB-9 speaker connectors on the

rear panel. See LBI-39102 which is included with this man-

ual set for I/O Backplane Board connector pin-out details.

Audio System Board

The Audio System Board is the heart of the Enhanced

Audio Enclosure. It accommodates all audio and logical

processing circuitry. Major circuits and functions:

•

Audio Input Circuits

—These circuits provide

amplification, filtering and level-adjustment for all

audio signals applied to the Enhanced Audio

Enclosure's audio inputs. Input signals include mic

audio signals, balanced-line audio signals from the

CEC/IMC, balance-line audio signals from Call

Director equipment, and audio signals from

optional audio output devices such as an external

paging tone encoder (pager).

•

Audio Switching Matrix Circuits

—The audio

switching matrix routes conditioned (amplified,

filtered, level-adjusted) input audio signals to the

appropriate audio output circuits using ten (10)

8 x 8 cross-point switch matrix integrated circuits.

All console audio signals are routed through the

matrix chips. Input audio signals are applied to the

"y" side of the matrix and output signals are sent

out from the "x" side. The audio matrix chips are

controlled (switched) via digital logic signals from

the on-board microcontroller circuits.

•

Audio Output Circuits

—Prior to application to

the appropriate Enhanced Audio Enclosure output,

each audio signal on the output side of the audio

matrix (a switched-in signal) is applied to an audio

output circuit. Each audio output circuit provides

amplification/attenuation, impedance matching

and/or level-adjustment in the output path. Output

paths include headset earphone audio, low-power

speaker audio ("select" and "unselect" audio),

balanced-line audio signals to the CEC/IMC,

balance-line audio signals to Call Director

equipment (optional), and single-ended audio

signals to call-check recorders (optional).

•

Microcontroller Circuits

—80C32-based micro-

controller circuits on the Audio System Board

control and process all logical data signals to and

from the Audio System Board's I/O logic circuits.

These circuits include (non-inclusive listing) the

audio switching matrix, several serial ports, bi-state

logical inputs, and bi-state logical outputs. The

microcontroller circuits also read the on-board

analog-to-digital converter circuits used for

volume-unit (VU) meter indications and they con-

trol the tone generation circuits.

•

PC Serial Port Circuit

—An RS-232 serial port

for control data communication with the PC.

•

Dispatch Keyboard Serial Port Circuit

—This

serial port receives keystroke data from the

dispatch keyboard. Operating power for the

keyboard’s internal logic circuits is also delivered

to the keyboard via this serial port.

•

Expansion Serial Port Circuit

—An RS-422 serial

port which permits interfacing to external serially-

interfaced equipment. (Reserved for future use.)

•

Bi-State Logic Input Circuits

—These circuits

interface bi-state logical sense lines from external

equipment connected to the Enhanced Audio

Enclosure to the Audio System Board's

microcontroller circuits. Examples include

microphone PTT sense lines, microphone

connected/not connected sense lines, headset

connected/not connected sense lines, and Call

Director off hook and Call Director jack sense

lines. Each logic input line includes a pull-up

resistor and a low-pass filter circuit.

•

Bi-State Logic Output Circuits

—These circuits

interface the microcontroller circuits to bi-state

logical output devices such as relay contacts. The

Audio System Board has a total of seven (7) on-

board relays.

•

Analog-to-Digital Converter Circuit

—The ana-

log-to-digital (A/D) converter circuit's primary

function is to provide VU (Volume-Unit) data to

the PC on the selected module/entity transmit and

receive signal levels. The microcontroller reads the

A/D converter and it sends the read data to the PC

via the serial control data link. VU indications are

displayed in the console GUI’s VU meter panel in a

bar graph format. The A/D converter circuit is also

utilized during automated test and alignment

procedures.

•

Tone Generation Circuits

—Tone generation

circuits on the Audio System Board include two (2)

sinewave generators which give the Enhanced

Audio Enclosure the ability to generate tones for

integrated paging operations. Therefore, an external

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Console House UDS 4 Mode Specifikace Strana 23

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