Settings filename: 5001_8001_1002_1001_1005_2bw.stn

COM-5001 LAN 10-baseT Interface
  -> COM-8001 Arbitrary Waveform Generator
    -> COM-1002 BPSK/QPSK/OQPSK digital modulator
      -> COM-1001 BPSK/QPSK/OQPSK digital demodulator
        -> COM-1005 Bit Error Rate Measurement

Objective:
Demonstrate the ability to load a large (1MB) binary file, play it back as a two-bit wide
data stream, use the data stream as input to the QPSK modem, and recover the 
data stream error-free at the demodulator. 
The two-bit wide format guarantees that the two (I/Q) bits are transmitted within the 
same QPSK symbol.
The QPSK modulator sets the data rate at 19.8 Mbit/s. 
Data is pulled out of the arbitrary waveform generator at the symbol rate set by the 
QPSK modulator, using a flow-control mechanism.

Note: a similar settings is available for 2-bit wide sample.
(5001_8001_1002_1001_1005_2bw.stn)

The ComBlock assembly IP address is configured to be 172.16.1.128
If this IP address does not match your network, edit the 5001_8001_1002_1001_1005_2bw.stn file
(change the COM-5001 registers 0-3 [IP address] and 4-7 [IP mask] and 8-11 [IP Gateway].
Note: recycle power after changing the IP address.

Step 1: Check the LAN connection.
Power up the ComBlock assembly. Wait 10 seconds for all FPGAs to configure.
Connect the COM-5001 to a LAN hub or PC (the latter requires a crossover cable).
From the ComBlock Control Center, select the Communication Setup (leftmost icon).
Select the LAN connection. Perform a Ping to check that the LAN connection is OK.

Step 2: Configure the ComBlock assembly.
From the ComBlock Control Center, enumerate the ComBlock assembly (2nd icon from
the left). 5 units are found. Then import the 5001_8001_1002_1001_1005_2bw.stn  settings 
file from the File | Import menu. The assembly is now configured.
If the LAN address was changed, one must recycle power (wait 10 seconds and enumerate again).

Step 3: Upload binary file.
Open the window Function | Pattern generator. 
Upload the binary file "PRBS11_2bw.bin" (in the ComBlock CD Basic Settings folder, or ComBlock web site).
The file contains 1,048,064 bytes (4,192,256 symbols of 2-bit each).
Do the entire upload, starting at address 0.
Select Action = Start Upload. Then Apply.
The menu should show a progress bar, then indicate successful upload of 1,048,064 bytes.

Step 4: Playback binary file
Select Action = Start continuous download. 
The download window length is 1,048,064 bytes.
The output flow is "Data pulled" as the QPSK modulator manages the flow control.

Step 5: using an oscilloscope, verify that the BER measurement module is 
(a) synchronized (TP1 is high)
(b) receives a periodic (206.8us) start of PRBS11 sequence (TP4)
(c) detects no bit errors (TP3 is always low).