Specifications

LBI-39100
10
are located near the bottom of the keyboard for quick and
easy access. For example, transmit and module pick keys are
at the bottom. Seldom used keys are located near the top of
the keyboard. Key groups include:
•
a selected transmit (PTT) key
•
fourteen (14) module pick keys
•
fourteen (14) instant module transmit keys
•
nine (9) module control keys
•
three (3) emergency keys
•
nine (9) edit control keys
•
three (3) tone keys
•
a numeric keypad (telephone style)
•
eight (8) common control function keys
•
five (5) simulselect keys
•
eleven (11) patch keys
•
five (5) telephone/intercom keys
•
ten (10) function keys and an escape key
ENHANCED AUDIO ENCLOSURE
The C3 Maestro's Enhanced Audio Enclosure contains
all audio interface, audio routing and Dispatch Keyboard
interface circuitry for the console system. Basically, the unit
consists of:
•
a metal case assembly
•
an ac-to-dc power supply located inside the case
•
an I/O Backplane Board located inside the case
•
an Audio System Board located inside the case
•
operating firmware which is part of the Audio
System Board
•
19-inch EIA rack-mount hardware (optional)
Case Assembly
The Enhanced Audio Enclosure's case provides housing
for all major components within the unit. As shown in the
assembly diagram in this manual (page 16) the Enhanced
Audio Enclosure's case assembly basically consists of a
lower steel frame assembly which includes the rear panel, a
upper steel frame (top cover), a molded plastic front panel
and miscellaneous assembly hardware. The case is
constructed with heavy-gauge sheet metal so heavy items
such as the console's video display monitor can be placed on
its top without causing case distortion.
Enhanced Audio Enclosure Contrast From Earlier Design "Audio Tower"
Earlier-design C3 Maestro console systems utilized an audio unit referred to as the "Audio Tower". When
compared to the Audio Tower, the Enhanced Audio Enclosure provides additional features in a neater package
than the earlier-design Audio Tower. In addition, the Enhanced Audio Enclosure is considerably smaller and
more durable than the Audio Tower. This size reduction eases installation space requirements which, in many
installations, reduces system costs when compared to a C3 Maestro console equipped with an Audio Tower.
An optional rack-mount hardware kit is available which allows installation of the Enhanced Audio Enclosure into
a standard 19-inch rack-mount cabinet or case. The Audio Tower was not rack mountable. Speakers used with the
Enhanced Audio Enclosure may also be rack mounted.
As previously stated, the Enhanced Audio Enclosure utilizes an RS-232 serial control data link between it and the
PC. This is in contrast to the earlier Audio Tower design which utilized a specialized Logic Board within the PC
and a large, bulky interconnect cable between the Logic Board and the Audio Tower. This Logic Board-to-Audio
Tower interface was parallel, not serial.
The specialized Dispatch Keyboard ("custom keyboard") used with the C3 Maestro console system operates on a
serial data link. A C3 Maestro console equipped with an Audio Tower utilized a serial port at the Logic Board for
Dispatch Keyboard interfacing. A C3 Maestro console equipped with an Enhanced Audio Enclosure utilizes a
serial port provided by the Enhanced Audio Enclosure.
For complete information on an earlier C3 Maestro console system equipped with an Audio Tower, refer to
maintenance manual LBI-39062 or LBI-38715.