Audio-Data matrices
The Ro.Ma. enginery Audio /Data Matrices are used in the radiocommunication system to interface the transmitting and receiving audio/data channels to the operator consoles, providing a
capability to switch a number of input signals to a number of outputs. All the matrices are of “no blocking” type, i.e. each output has independent access to any input irrespective of the number of outputs being connected to the same input. Modular
design allows different configurations with various numbers of inputs and outputs, as required.
Main features:
Full non-blocking switch function
Flexible equipment configuration
Customer specified impedance
RS232, LAN 10/100 and local control
Options: balanced or un-balanced signal interface
Audio matrix MR-496-3, 64 x64
The MR-496-3 provides switching of 64 input lines into 64 output lines , combining in the same matrix capabilities for switching both audio and RS-232 data lines,
a characteristic which allows a very versatile use of this equipment. The matrix is controlled by a microprocessor card outfitted with a programmable RS-232 serial line. The matrix is of no-blocking type, i.e capable of switching any input
simultaneously to all the 64 outputs, control can be local by use of a dedicated keyboard or remote over a RS-232/485/422 serial line.
The MR-496-3 configuration includes:
qty 1 CPU card for control and monitoring, also used for the RS-232/485 serial
communication
qty 8 Audio/Data matrix cards, 64 inputs, 8 balanced outputs
qty 4 input cards for the termination of the input balanced lines
qty 4 optional cards for the management of the PTT signals, 2 for the 64 PTT
inputs and 2 for the 64 PTT outputs
qty 2 power supplies, one operating and one back-up
qty 1 keyboard and LCD display for local control of the matrix nodes and status
monitoring
qty 1 19” standard rack, 6 units.
The matrix is all solid state with a modular structure which allows replacement of
modules during operation (with the only exception of the CPU card and front panel), each module is a 64 input x 8 input no-blocking submatrix. The matrix can be connected to 600 Ohm balanced lines and to balanced/unbalanced data lines at data rates
up to 100kbit/sec. All the interconnections are flat
cables terminated with connectors, all inputs and outputs are protected against over voltage and over current conditions.
- Technical characteristics
Audio inputs |
64 |
Audio outputs |
64 |
In/Out gain (audio) |
0 dB ± 0,5 dB |
3dB bandwidth ( audio) |
DC to 200 KHz |
No blocking loss |
2 dB max |
Input – Input isolation |
> 70 dB |
Output – Output isolation |
> 70 dB |
Switching time ( audio) |
< 10 mS |
Input/output impedance |
600 Ohm nominal, high impedance programmable |
Power handling |
20 dBm max |
Distortion |
1% max |
Communication protocols |
1) Arconia compatible 2) Elmer compatible, the two protocols are automatically
recognized |
Communication interface |
RS 232- RS 485, 4/2 wires, dip-switch programmable |
PTT (optional) |
64 Open/Ground inputs and 64 Open/Ground outputs, 28Vdc/70mA max. |
Primary power |
220Vac/115Vac, two power supplies, one in hot stand-by, with indication of any failure
on the display. |
Size |
19” standard rack, 6U , 460mm deep |
Temperature range |
-10°C to +50° C |
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