MDS 05-3628A01, Rev. B
MDS 4790M (MPT 1411) I/O Guide
35
Pre-emphasis is a function used in older analog radios where the modulating
signal is increased (at the transmitter) at the higher frequencies to increase
system performance. De-emphasis compensates (at the receiver) for a signal
that has had pre-emphasis applied.
ON
indicates that pre-emphasis and de-emphasis are enabled, and
OFF
indicates that pre-emphasis and de-emphasis are disabled.
HREV
This command displays the hardware revision level.
INIT
This command resets customer-programmable settings back to factory defaults:
• DCE device behavior
• 37 dBm (5 watts) RF output power
• 0ms CTS delay (that is, CTS is continuously asserted)
• 0ms PTT delay
• 0ms SCD delay
• Timeout Timer (maximum continuous key duration) is enabled and
set to 30 seconds
• DB25 port set to 9600 baud, 8 data bits, no parity, 1 stop bit
• Keying mode is key-on-data
• Diagnostic test outputs are disabled
• Transmit Audio Level is set to
AUTO
• Receive Audio Level is set to –10 dBm
• Repeater Mode is disabled
• Pre/de-emphasis control is disabled
• Receive Timeout Timer is disabled
• TX Gain and RX Pad are disabled
• Major Alarm Mask is set to 0xFFFF 0000
• Minor Alarm Mask is set to 0x0000 FFFF
• Alarm sense is set to ACTIVE HI
• Vox timeout time is set to 500ms
• Remote maintenance eepot settings are reset
• Continuous Key is disabled (
CKEY
)
• Seamless operation is enabled (
BUFF
)
•
DLINK
is set to 19200 baud and disabled
•
DMGAP
is set to 3
• RTU simulator is set to 0 (disabled)
• Front panel display and brightness are both set to mid-level
KEY
This command activates the transmitter. See also the
DKEY
command.
Manual Key screen, page 56
