Comtech EF Data CDM-750 Installation And Operation Manual page 68

CDM-750 Advanced High-Speed Trunking Modem
Front Panel Operation
(CONFIG) Tx: Data
Tx Data Rate = 070000.000 kbps
To configure the Tx Data Rate: First, use the
use the arrow keys to edit the value of that digit. Note the following:
▲ ▼
•
The maximum limits for the Data Rate are based on a symbol rate range from 1 Msps to
63 Msps.
•
Refer to Table 5-2 on the next page for available modulation and code rate combinations.
Note that, in this table, in the data rate range columns there is some roundoff of the last
digit.
•
The actual minimum and maximum data rates are dependent on Framing mode, Interface
type, Modulation type and FEC Code Rate.
•
When the user changes any of the higher-priority parameters – causing the data rate to
become invalid – the Data Rate is adjusted automatically. The upper range of data rate is
also dictated by the FAST option(s) installed.
Press ENTER when done.
(CONFIG) Tx: Data
Tx Symbol Rate = 30000.000 ksps
To configure the Tx Symbol Rate: First, use the
use the arrow keys to edit the value of that digit. Note the following:
▲ ▼
•
The Data Rate digits also change as the Symbol Rate values are edited. The value of the
Data Rate depends upon the code rate, modulation type, and the Mode type selected.
Refer to Table 5-2 on the next page for available modulation and code rate combinations.
Note that, in this table, in the data rate range columns there is some roundoff of the last
digit.
•
When modulation, code rate, and other parameters are changed, the modem attempts to
maintain the same Symbol Rate, provided it is still in range when one of the other
parameters is changed.
•
When programming, the modulator will not accept a new data or symbol rate unless it is
in the range, and it will turn off the Tx Carrier. If a new rate is not accepted, change the
Modulator Code Rate or Mode.
Press ENTER when done.
Tx Data Rate
▲ ▼
Tx Symbol Rate
▲ ▼
5–14
v)
(
arrow keys to select a digit to edit, and then
v)
(
arrow keys to select a digit to edit, and then
Revision 1
MN-CDM750