Comtech EF Data CDS-100 - Manual (Page 27)

CDS-100 Diversity Switch MN-CDS100
Introduction Revision 1
1–7
1.3.2 Diversity Data Switching
Diversity switching differs from standard modem 1:1 redundancy switching, whereas diversity
switching usually means full chain redundancy is in use and, therefore, data and IF switching is
handled via equipment external to Comtech EF Data’s supplied equipment.
The CDS-100 is designed to provide the system designer with maximum flexibility by allowing
the modems to switch autonomously or slaved to an external controller. In most applications,
slaved operation is used.
1.3.2.1 Basic Diversity Operation
Figure 1-4. Basic Diversity Operation
In most basic diversity configurations, an external control system provides the monitoring and
control of both fully redundant communication chains. In such cases, you must configure the
CDS-100 to switch only on Unit Fault or Ext Fault. You must provide proper cabling between
your ‘Controller’ and the ‘J1’ and ‘J2’ interfaces of the CDS-100.
If Modem Chain ‘A’ is online, and it is desired to switch to Modem Chain ‘B’, then your
‘Controller’ must provide the proper signal activation on the ‘J1’ interface to force Modem 'A'
Offline and Modem 'B' Online. Likewise, if Modem Chain ‘B’ is online, and it is desired to switch
to Modem Chain ‘A’, then your ‘Controller’ must provide the proper signal activation on the ‘J2’
interface to force Modem 'B' Offline and Modem 'A' Online.