Mocomtech CDM-QX - Manual (Page 156)

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Ethernet Management MN/CDMQX.IOM
6–26
With Base selected, the nested Test page allows the user to simultaneously view the
constellations of all installed demodulators. The top image in Figure 6-12 shows such operation,
where Base Æ Test displays the constellations for this particular configuration’s four installed
demodulator modules.
Contrast this with the bottom image in this same figure where, with Tx Æ Test selected, test
functions applicable only to the modulator module are provided on this nested page – because
Constellation and Spectrum Analyzer functionality is reserved for demodulator modules, they are
not provided here.
The user may also view the constellation for either a standlone demodulator module (i.e., Rx Æ
Test), or for the demodulator that is part of a modem group (i.e, MD Æ Test ). Figure 6-13, on
the previous page, illustrates such examples:
• The top image depicts a configuration running independent Tx and Rx modules. The
constellation for the demodulator installed in Slot#2 is viewed by selecting the Rx icon.
• The bottom image depicts a configuration running a grouped modem. With MD selected
from the icon quad, the nested Test page displays the constellation for the demodulator
module installed in Slot#2.
Test Mode
(Available on the Tx and MD nested Test pages) – Use the drop-down menu to select Normal, IF
Loopback, Digital Loopback, I/O Loop, RF Loopback, Tx CW, or Tx Alt 1-0. Click [Submit]
when done.
Built-in BER Tester (BERT) Generator
(Available on the Tx and MD nested Test pages) – Using the drop-down menus:
• State – Select as OFF or ON.
• Pattern – Select Space, Mark, 1:1, 1:3, 63, 511, 2047, 2047R, MIL188, 2^15-1, 2^20-1,
or 2^23-1.
• 10E-3 Err Ins – Select as OFF or ON.
Click [Submit] once all the parameters have been set in this section.
Built-in BER Tester (BERT) Monitor
(Available on the Rx and MD nested Test pages) – Using the drop-down menus:
• State – Select as OFF or ON.
• Pattern – Select Space, Mark, 1:1, 1:3, 63, 511, 2047, 2047R, MIL188, 2^15-1, 2^20-1,
or 2^23-1.
• Sync Thres – Select as >256, Low, Mid, or High.
Click [Submit] once all the parameters have been set in this section.
BERT Results
(Available on the Rx and MD nested Test pages) – Click [Restart] or [Update] as needed. Note
that the Bit Errors and Average BER text boxes are read-only.