Datum Systems PSM-500 - Page 82

Operation PSM-500/500L/500LT SCPC Satellite Modem
Page 3-22 PSM-500/500L/500LT - Rev. 0.91
Demodulator Parameter Detail
Representation
Type
Entry
Description
Data Descrambler
Auto
Selection 0 = Disable,
1 = Auto
2 = V.35,
3 = Intelsat, ,
4 = Alt V.35,
5 = Alt. Intelsat
6 = EFD
7 = TPC Sync
Scrambler types. Types are
added if optional hardware is
installed. The Auto mode uses
IESS 308 & 309 standards to
automatically switch to use
synchronous scramblers part
of R-S and TPC.
Data Clk Source
RCV Clock
Selection 0 = RCV Clock
1 = Internal,
2 = External,
3 = Mod Clock
Receive Data Clock Source.
Selecting “0” disables FIFO
buffer, any other setting
enables it.
»Data Buffr Delay
2.00000ms
Numeric 0 to maximum calculated
by data rate.
Receive FIFO buffer delay in
milli-Seconds.
»Data Buffer Size
512 Bits
Numeric 0 to 131,070 bits in 1 bit
increments.
Receive FIFO buffer delay in
bits. Buffer has this many bits
filled and empty when
centered.
Data FEC Hold
1
Numeric 0 to 255
Normally set to 1
Number of FEC lock “cycles”
the FEC will accomplish
before declaring loss of lock.
Mux Mode
IBS Custom
Selection 0 = Disabled,
1 = IBS Standard,
2 = IBS Enhanced
3 = IBS Custom
Enables Multiplexer to
specified mode. Enable
makes other menu selection
below visible.
»Mux ESC Overhead
9600 bps
Selection 0 = Disable
1 to 7 selects standard
rates 300 bps – 38.4 kbps
Only in Custom Mode.
Selects framing resources
committed to ESC Comm.
»Mux MCC Overhead
1200 bps
Selection 0 = Disable
1 to 7 selects standard
rates 300 bps – 38.4 kbps
Only in Custom Mode.
Selects framing resources
committed to MCC Comm.
»Mux Ratio
15:16
Read Only Shows current data to
aggregate ratio for mux.
»Mux ESC Port
RS-485, 4 Wire
Selection 0 = RS-232,
1 = RS-485 2 wire,
2 = RS-485 4 wire,
3 = RS-485 Drvr On
Physical ESC port type.
(coupled to transmit)
»Mux ESC Rate
9600 bps
Selection 0 to 7 selects standard
rates 300 bps – 38.4 kbps
Physical ESC port rate at rear
panel. (coupled to transmit)
»Mux ESC Frmt
N,8,1
Selection 0 = N/7/1,
1 = P/7/1,
2 = N/8/1,
3 = P/8/1
Physical ESC port format at
rear panel. (coupled to
transmit)