Comtech EF Data SDM-100A - Manual (Page 54)

Operation SDM-100A Satellite Modem
3–20 Rev. 0
ADPCM Intf ADPCM interface ON/OFF selection. If ADPCM is set ON, the ADPCM
operation is selected. If ADPCM is set OFF, then the standard RS-422
interface option is selected. Available only with the ADPCM option
installed.
Circuit Type This refers to the emulation mode of the modem ADPCM interface.
When the subscriber is selected, the modem interface is configured as
a subscriber circuit. When the trunk is selected, the modem interface is
configured as a trunk. Available only with the ADPCM option installed.
E&M Circuit This allows the user to chose which E&M signaling type is selected.
Types 1 to 4 are supported. Available only with the ADPCM option
installed.
Encoding Type This configures the audio channel to support either A-law or µ-law
encoding. Available only with the ADPCM option installed.
On Hook/Off Hook Selects between ON HOOK and OFF HOOK operation. Available only
with the ADPCM option installed.
TX Channel Level This allows the user to set the input level for the transmit audio from -20
to +10 dBm, in 1 dBm steps. Available only with the ADPCM option
installed.
RX Channel Level This allows the user to set the input level for the receive audio from -20
to +10 dBm, in 1 dBm steps. Available only with the ADPCM option
installed.