Comtech EF Data SFC1800A - Manual (Page 19)

SFC1800A Synthesized Frequency Upconverter Theory of Operation
TM111 – Rev. 1.0 3-3
3.1.3 1:8 Switch
In a 1:8 Switch, the Converter detects whether it is connected as PRIMARY1 through
PRIMARY8, or as the BACKUP. The RCU108 is flexible in that it can be set up with anywhere
from 1 through 8 Primary SFC1800A Upconverters. However, there is only one backup. Thus,
only one Prime can be backed up at one time.
Figure 3-3 illustrates a typical interconnection of a SFC1800A Upconverter with an RCU108 1:8
Protection Switch. The configuration shown is a 1:2 Switch.
3.2 Optional Chain Switching Operation
For Chain Switching, each converter in a 1:N configuration (where N is less than or equal to 8)
will contain an optional Chain Switching Module. During set up, one of the converters will be
considered the backup. This is usually the converter at the bottom of the rack. Once the system
is set up and properly wired, each converter then has an ID Address and can be programmed
from the Front Panel to set the priority level of each converter in the rack. If no priority is set from
the Front Panel then the priority will default to level one with the converter closest to the back up
having the highest priority and priorities incrementally decreased the further from the back up.
Figure 3-2. RCU101 Typical Interconnection with SFC1800A Upconverter