Comtech EF Data CDM-760 - Manual (Page 96)

Front Panel Operation Revision 2
CDM-760 Advanced High-Speed Trunking Modem MN-CDM760
6–10
(CONFIG: Tx) Data  Tx Data Rate
PREREQUISITE:
You must make sure the modem is in Single Stream Mode, with only the Ethernet
interfaces active before you can set the Tx Data Rate.
If the minimum data rate is zero (MIN_DR=000000.000), then the modem is in
Single Stream Mode with only the Ethernet interfaces active:
ETH_DR + MIN_DR = TOT_DR
009653.266 000000.000 009653.266 kbps
The data rate cannot be changed while the modem is in MultiStream Mode. If the
minimum data rate is not zero, then the modem is in MultiStream Mode:
ETH_DR + MIN_DR = TOT_DR
019484.479 034883.520 054367.999Kbps
See Section 0 about entering or exiting MultiStream Mode.
Equation Example (top line) – For the ETH_DR + MIN_DR = TOT_DR (RO) equation:
• ETH_DR = Ethernet Data Rate
This is always TOT_DR – MIN_DR. It is all data associated with the Ethernet data interfaces.
• MIN_DR = Minimum Data Rate
This read-only value is always zero (000000.000) when the unit is in Single Stream Mode and
only Ethernet Data Type is enabled.
In MultiStream Mode, the MIN_DR is the aggregate of all active non-Ethernet interfaces,
plus the MultiStream overhead. This overhead is 1.5% of the aggregate non-Ethernet data in
Normal Block Mode, and 5% in Short Block Mode.
• TOT_DR = Total Data Rate
This read-only value is the aggregate data rate of the modem. It relates to the Tx symbol
rate and spectral efficiency (ModCod) settings.
The MIN_DR and TOT_DR values are read-only. You cannot edit these values.
On the bottom line, change the ETH_DR value. Use the   arrow keys to select a digit, and
then use the  arrow keys to change that digit. Press ENTER.
Data Rate Values:
The maximum limits for the Data Rate are based on a symbol rate range from 0.1 to 150 Msps.
The actual minimum and maximum data rates are dependent on Network Spec, Framing mode,