Ibs Operation; Table 3-5. Ibs Parameter Settings - Comtech EF Data SDM-300A Installation And Operation Manual

Operation
3.4.2.2

IBS Operation

To operate the modem in the IBS configuration, the following cards must be installed in
the modem:
•
•
The IBS option is a FAST feature that must be enabled using the front panel and the
Utility Modem Type menu. Table 3-5 lists the parameters that are accessible once the
IBS modem type is enabled.
Parameter
Modem Type
TX Data/Code Rate
TX-IF Output
RX Data/Code Rate
TX Clock Source
Buffer Clock Source
TX Coding Format
RX Coding Format
The IBS modem type is an open network application, primarily used for data circuits. IBS
has a variable overhead structure that is dependent on the transmitted data rate. Refer to
Section A.1.7 for more information on IBS theory of operation.
3–78
Overhead G.703/IDR/IBS/ASYNC/AUPC/D&I card (PL/5305-1)
50-pin D relay adapter card (PL/5509)

Table 3-5. IBS Parameter Settings

Front Panel Setting
IBS
TX-V, QPSK 1/2
ON
RX-V, QPSK 1/2
TX Terrestrial, Internal, Ext. Reference
Satellite, TX Terrestrial, Internal, Ext.
Reference
AMI, B8ZS, or HDB3
AMI, B8ZS, or HDB3
SDM-300A Satellite Modem
Reference Menu
Utility Modem Type
Configuration Modulator
Configuration Demodulator
Configuration Demodulator
Configuration Interface
Configuration Interface
Configuration Interface
Configuration Interface
Rev. 4