73M1966B Evaluation Kit User Manual
UM_1966B_024
8
Rev. 1.0
2.1 Connecting to the PCM Test Set
Using the cables that came with the PCM test set:
1. Connect the test set TXDATA to the Motherboard DR (Data Receive).
2. Connect the test set RXDATA to the Motherboard DX_PCM (Data Transmit).
3. In most configurations, the clock and frame sync are supplied by the test set. Connect the test set
CLOCK to the Motherboard CLKI_PCM. Connect the test set SYNC to the Motherboard FS_PCM.
4. It is important that the analog signals are connected to the correct analog connectors. There are both
2-wire and 4-wire ports and a selector switch on the Wandel & Goltermann PCM-4. Make sure that
the correct connection and mode selection are used for the particular test being performed.
5. The DC loop supply connects the DC feed to the device under test (DUT) and AC couples the audio
to the PCM channel test set. Refer to the documentation for the test set being used for details about
requirements and limits.
2.2 Connecting the SPI to the PC
Using the supplied parallel interface cable:
1. Connect the 10-pin female end to the Motherboard GUI INTERFACE connector (J42) so that the
ribbon extends outward away from the board.
2. Connect the 25-pin male end to the PC port.
2.3 Connecting to a Central Office Line Simulator
When interfacing the 73M1966B EVM analog signals to a PCM measuring set such as the Wandel &
Goltermann PCM-4, it is necessary to provide DC loop current to the 73M1966B line interface in order for
it to operate correctly. Figure 3 is an example of a circuit that can provide this function.
A simpler alternative that could be used in other applications is to use a current limiting resistor in series
with a DC power supply. See Figure 4.
Figure 3: Central Office Line Simulator
L1
6H
L2
6H
WANDEL & GOLTERMANN
PCM-4
Tip
73M1966B
48V D.C.
Power Supply
Ring
C1
100uF
C2
100uF
RX Termination
TX Source
Vsource
RX SIGNAL
FRAME TRIGGER/EXT. FRAME
TX SIGNAL
TX CLOCK
C.O. CIRCUIT COMPONENTS
Current Limit