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Diagnostic Functions
Follow these instructions to apply the Rcv dB Levels routine:
1.
Select the Channel diagnostics and Data Path Test as described above. Use the up or down
cursor position keys to select RCV DB.
2.
Use the left and right cursor position keys to move the cursor to the Data Origin field. Use
the up and down cursor position keys to select the Node M or Node S channel module for
output level adjustment.
3.
When a node is selected, press the Return key. A display is generated, such as:
Use the up and down cursor position keys to select a level. The selected level becomes active in
the system. To exit the routine, enter Control X; the message is displayed:
SAVE CHANGES Y/N
If you enter Y, the level is stored in non-volatile memory for each configuration in which the
channel is configured as a voice channel. The channel output remains at the selected level until
the routine is applied to this channel again, or another configuration is activated. If you enter N,
the configuration is not stored; however, the channel output level remains at the selected level
until the routine is applied to the channel again, or any configuration is activated.
The Channel Diagnostics menu returns to the screen, and another diagnostic routine may be ap-
plied to the channel.
Tandem Voice Channels Data Path Tests
When the Voice II/CVSD channels are installed in a tandem arrangement, special loopback test
paths may be selected; these paths are illustrated by Figure 8-8. The data origin for the data path
tests is always the local voice channel; for the tests listed below, the loopback may occur at the
data origin voice channel (a local loopback) or at the far end voice channel module, as shown in
Figure 8-8. When this test mode is selected, the test data passes through every MEGAMUX
PLUS link in the tandem arrangement.
•
•
•
The node of data origin (in this case the voice channel) and the node loopback point (the voice
channel located at the far end of the link) determine the test loopback path. When the far-end
voice channel is chosen as a loopback point, an arrow is shown in the display as the loopback
point. A selection for a 1 kHz test for voice channels in a tandem arrangement would appear as
follows.
TEST TYPE MENU
1 KHZ
NOTE
The loopback tests use a control signal, passed from the data origin voice channel module to the
loopback point voice channel module, to place the loopback point voice channel module into a
loopback mode. You must use the GDC cable shown in Figure 8-8 to connect the data channel
modules in the tandem link. This ensures a complete transmission path for the control signal.
SET RCV DB FOR NODE M
VF Idle Test
User Data Test
1 kHz Test
DATA PATH TEST MENUS
0.0
DATA ORIGIN
LOOPBACK POINT
NODE M
8-17
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036R660-000, Issue 10
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