Comtech EF Data DD2401 VME - Manual (Page 53)

DD2401 VME L-Band Demodulator Card Installation & Operational Manual User Interfaces
MN-VME2401 – Rev. B 4-29
<1>
<1>
<1>
<1>
Exponent
BER/EbNo Status
Input Level
Input Level State
AGC Voltage
Bit 0 = Raw BER and Corrected BER Status (1 = Valid)
Bit 1 = Test 2047 BER Status (1 = Valid)
Bits 2 - 3 = EbNo Status (0 = EbNo is Invalid, 1 = EbNo is Valid, 2 =
EbNo is Smaller Than Indicated Value, 3 = EbNo is
Greater Than Indicated Value)
Bit 4 = Raw BER Counter Overflow (1 = overflow condition)
Bit 5 = Test 2047 BER Counter Overflow (1 = overflow condition)
Bits 6 & 7 = Spares
Binary Value in -1 dB Steps, Negative Sign Implied
Signed Binary (0 = Equal to, 1 = Greater Than, -1 = Less Than Value
in -1 dB Steps, Negative Sign Implied)
In Hex, decimal point implied.
Opcode: <2437h>
Query a Demodulator’s Lock Status
Query response
<1> Lock Status Bit 0 = Demod Chipset Lock (0 = Unlocked, 1 = Locked)
Bit 1 = Viterbi Lock (0 = Unlocked, 1 = Locked)
Bit 2 = Reed-Solomon Lock (0 = Unlocked, 1 = Locked)
Bit 3 = Sequential Lock (0 = Unlocked, 1 = Locked)
Bits 4 – 7 = Spares
(Decoders not in use default to locked state)
Opcode: <2A00h>
Command a Demodulator’s Configuration
<4>
<4>
<1>
<4>
<1>
<1>
<1>
<1>
<1>
<1>
<1>
Frequency
Data Rate
Sweep Boundary
External
Reference
Freq. Reference
Source
Input Level Limit
Demodulation
Type
Convolutional
Decoder
Reed-Solomon
Reed-Solomon N
Reed-Solomon K Binary Value, 1 Hz Steps
Binary Value, 1 BPS Steps
Sweep Limits, Max of
±  42 kHz
Unsigned Binary Value in Hz
0 = Internal, 1 = External
Lower Level Limit, Binary Value, 1 dB Steps, Negative Sign Implied
0 = QPSK, 1 = BPSK, 2 = 8PSK, 4 = OQPSK
0 = None, 1 = Viterbi 1/2 Rate, 3 = Viterbi 3/4 Rate, 5 = Viterbi 7/8
Rate, 7 = Sequential 1/2 Rate, 9 = Sequential 3/4 Rate, 11 =
Sequential 7/8 Rate, 14 = Trellis 2/3, 20 = TPC 0.793 2D, 21 = TPC
0.495 3D, 23 = TPC ½, 24 = TPC ¾, 25 = TPC 7/8, 26 = TPC 21/44
0 = Disable, 1 = Enable
Unsigned Binary
Unsigned Binary