B&B Electronics 3PXCC2a Spezifikationen PDF herunterladen (Seite 8)

AE/LZB 119 1894 R1A BOARD SET-UP

power. Factory settings are shown in Figure 3. These

switches have no effect on headset earphone output levels.

Currently, the other two DIP switch positions on SW1 are

not used.

NOTE

SW1 may have a tape seal placed over the switches

to prevent changes.

Minimum Volume Level DIP Switch (SW1 Position 1)

When SW1 position 1 is "OFF" or "OPEN", the

minimum volume level feature is enabled. This is the factory

setting. With this setting, audio from the speaker cannot be

completely turned off by rotating the volume control on the

Speaker Assembly's front panel fully counterclockwise.

Specifically, with the volume control fully

counterclockwise and a nomimal audio level of 436

millivolts rms at a frequency of 1kHz from the Enhanced

Audio Enclosure, the audio output level from the speaker

will not drop below approximately 0.38 milliwatts or 55

millivolts rms across the 8-ohm speaker. This wattage figure

assumes SW1 position 2 is also "OFF" or "OPEN",

selecting the 2-watt maximum volume level. With SW1

position 2 selecting 5-watts, the minimum volume level is

approximately 1.25 milliwatts or 100 millivolts across the 8-

ohm speaker.

When SW1 position 1 is "ON" or "CLOSED", the

minimum volume level feature is disabled and audio from

the speaker may be completely turned off by rotating the

volume control fully counterclockwise. This setting should

be used with caution since calls, especially calls on unselect

audio channels, are more likely to be missed.

Maximum Volume Level DIP Switch (SW1 Position 2)

SW1 position 2 allows setting of the speaker's

maximum volume level to either 2 or 5 watts of output

power. Normally, the factory setting is 2 watts. This level is

recommended, as it should be adequate in nearly all dispatch

environments. The 2-watt setting is selected by setting the

switch "OPEN" or "OFF". When the switch is "CLOSED"

or "ON", the maximum output power is increased to

approximately 5 watts.

Both wattage figures assume the volume control on the

Speaker Assembly's front panel is set at maximum (fully

clockwise) and a nominal audio signal input level of 436

millivolts rms at a frequency of 1 kHz is applied to the

Speaker Assembly.

12 3

Figure 3

−−

Speaker Amp Board SW1 Factory Setting

At this time, configure SW1 as required. Switch

position selections are defined in the following table. If

the Speaker Assembly is a desktop (with case) style,

disassemble it by removing the four (4) screws from the

back of the case and then separate the case's front and

rear sections.

Table 3 – SW1 Selection Definitions

SW1

POSITION

OPEN

(OFF)

CLOSED

(ON)

minimum volume

enabled *

minimum volume

disabled

2-watt maximum

speaker power *

5-watt maximum

speaker power

3 (not used) * (not used)

4 (not used) * (not used)

* OPEN (OFF) is factory setting for all SW1 positions.

RS-422 BOARD

Most PCs used with the console are factory-equipped

with a plug-in RS-422-capable board for serial control data

interfacing to the CIM within the CEC/IMC Digital Audio

Switch. In these cases, no changes to the related factory

set-ups are required assuming the factory-installed RS-422

board is utilized for CIM interfacing.

If the factory installed RS-422 board is not used or not

present within the PC, it may be beneficial to review

information in this manual in the section entitled

“

CEC/IMC INTERCONNECTIONS

”, subsection

“

Control Data Link

” (page 12) at this time. If necessary,

also see “

SOFTWARE SET-UP PROCEDURE

”,

subsection “

PC CMOS SET-UP PROGRAM

” (page 37)

for serial port enable/disable configuration information.

CAUTION

Always observe proper equipment handling

procedures to protect the equipment from ESD

damage. Refer to LBI-38737 for complete details.

NOTE

CAUTION

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