Test:) Bert; Test:) Comp - Comtech EF Data CDM-760 Installation And Operation Manual

Front Panel Operation
CDM-760 Advanced High-Speed Trunking Modem
6.2.4.2

(TEST:) BERT

BER:No Sync
BERT:On
On the top line – Read-only BER (Bit Error Rate) information is provided as follows:
Parameter
BER
Count
Errs
On the bottom line – Use the   arrow keys to select a function. Then:
Function
BERT
Patt
Restart
ErrIns
6.2.4.3

(TEST:) Comp

K4 GZip Lossless Compression and Decompression in an optional feature that requires
installation of the Compression Card in the modem.
Bypass: Enable
Use the arrow keys to select Enable or Disable. Press ENTER. Note the following:
•
With Enable selected, K4 GZip compression is turned off (bypassed) while running a test (the
TEST MODE front panel LED Indicator is lit).
• With Disable selected, this assumes normal modem operation with K4 GZip compression
operable (the TEST MODE front panel LED Indicator is not lit).
Count:0.0E+00
Patt:2^23-1 Restart ErrIns ()
Description
This is the current Bit Error Rate of the demod. This BER figure is only available when BERT is ON.
When BERT is OFF, or if there is a mismatch in pattern selection, or if there is a substantial issue
with the link, this parameter displays "No Sync".
This is the total number of BERT Pattern bits received by the demodulator since BERT was enabled
or since the last Restart.
This is the total number of BERT Pattern bits received in error by the demodulator since BERT was
enabled or since the last Restart.
Instructions / Description
Press ENTER. Then, use the arrow keys to select ON or OFF. ON enables the BERT pattern
on the modem Tx and begins the search for the BERT pattern on the demodulator Rx.
Press ENTER. Then, use the arrow keys to select a BERT pattern that the modem can be set
to transmit and to search for on receive. Selections are 2047, 2^15-1, 2^23-1. The longest pattern,
2^23-1, is typically used in testing to ensure a solid data sync.
Press ENTER to reset all counters to 0.0E00.
Press ENTER to insert a single bit error that will be reported by the demodulator locked to the
BERT pattern.
Errs:0.0E+00
6–66
Revision 4
MN-CDM760
()