User manual

F-20 Appendix F: Redundant Backup
Moseley SL9003Q 602-12016 Revision G
Figure 8-11 Starlink QAM RX with DSP/PCL RX Backup and Router Connection
The router directs one of two balanced input pairs to the common balanced output. In a typical
application the router is rack mounted between main and standby receivers. Figure F-11 shows
the configuration for discrete audio. For digital audio outputs only, the left or right channel may
be substituted with the AES/EBU channel.
The Starlink Receiver acting as the main receiver provides control logic from the RJ45
connector (XFER) on the NMS card for switching signal the switcher/router. The Starlink
receiver control line (RJ45 pin 6) will be HIGH (+5V) to indicate the main receiver is healthy and
router input 1 will be selected. If the main receiver fails, the line will go LOW, and input 2 will be
selected (the Standby receiver will then be active).
The Broadcast Tools switcher router is configured internally with DIP switches to operate from
external control. The lid must be removed from the router to switch the DIP Switch 5 – 6 to the
ON position for remote control.
The transfer control cable is available from Moseley for this configuration (203-12416-01),
although a cable can be made from a shielded RJ-45 (Black Box p/n EVNSL60-0006). This is a
6 foot cable that can be cut, and the ends tinned to provide the RX XFER OUT signal (RJ45 pin
6) for the indicated connection. Be sure to maintain the shield performance by connecting to
ground. The high RF levels in typical STL receiver environments can cause problems.
F.6 Operation
F.6.1 Hot/Cold Standby Modes
Hot Standby ( *preferred)
Hot standby leaves both transmitters in the RADIATE ON condition, and the TP64 controls the
RF relay to select the active transmitter, thereby decreasing switchover time. This is the
preferred operating mode.
Cold Standby
Cold standby can be used in situations where low power consumption is a priority. In this mode,
the TP64 will control the RADIATE function of each transmitter, turning the RF output ON (in
tandem with the RF relay) as required for switching. This will increase switching time and a
corresponding increase in data loss during the switchover.