Crystal Vision
Introduction
SW221 3G User Manual R1.4
3
01/09/2016
1 Introduction
The SW221 3G provides simple 2 x 2 switching of 3G, HD or SD signals, making it ideal for
use either as an emergency transmission switch or to manually bypass products requiring
maintenance in a 24 hour station.
The SW221 3G is ideal for switching between the main and backup feeds of a television
station, and offers independent control of the two outputs. With manual switching there is the
choice of switching between two feeds either immediately or in the vertical blanking period,
with the SW221 3G detecting the video standard and switching at the appropriate point to
enable a cleaner switch.
An automatic switch away from a faulty source is triggered immediately on loss of input or
invalid video, determined by loss of the sync word structure. A single format can be set as
valid, allowing the SW221 3G to automatically switch away from inputs that are legal but not
the correct format. Switching back can either be automatic or by user intervention. When set
to automatic the board will switch back if the original input returns to a valid state, with a
programmable delay ensuring that the previously faulty input remains good for the selected
time period. When set to user activated it will stay on the new selection until the routing is
changed by the operator, or the new input becomes invalid.
The SW221 3G card can be controlled by Statesman PC control software, active control panel
such as the REMIND-E, SNMP or from its card edge controls.
The main features of SW221 3G are:
•
2 x 2 switch which works with 3G, HD and SD
•
Manual switch either immediately or timed
•
Automatic switching on detection of missing input, invalid signal or format
•
Flexible control, including board-edge, Statesman and remote panels, SNMP and
GPIs
•
Space-saving: 100mm x 266mm module allowing 24 SW221 3G in 4U
The SW221 3G fits in Crystal Vision’s four standard frames and can be integrated with any
boards from the company’s full product range. The RM53 and RM54 are the frame rear
modules. The RM54 has the benefit of relay bypass on out A.