Analogue Audio Channel
An ADPCM codec is used to convert the analogue voice signals into a 16 kbps
digital data and vice versa.
RS-232 Interface
The asynchronous serial interface is controlled by an UART chip. The
parameters of the communication are set by DIP switches and can be changed
remotely too.
Status and Control Bits
The 2x24 bits low speed signaling can be used to monitor or control remote
equipments, alarm systems, etc. The signals are sampled and refreshed in every
8 ms. The RX and TX sides are independent, both can be set up for either serial
or parallel operation. The not used inputs and outputs can be left un-terminated.
The inputs can be connected to TTL/HCMOS compatible source and are
protected from static electricity and voltage overload. The outputs can be
connected to relays or TTL/HCMOS compatible devices and maximum load
should not exceed 30 V or 40 mA.
DIP Switches
The configuration switches of the E1SC-UIM are used to set up the operational
parameters of the RS-232 interface, the status and controlling signal channels
and the 64 kbps digital channel.
LED Display
There are three LED indicators showing the actual state of the service channel
unit including initialization, loop back and voice channel status.
