MV-16 Multiviewer
www.snellgroup.com
Introduction
Issue 1 Rev 12
Page 9
© 2013 Snell Limited
1.2.1 Powerful Alarms
Alarms can be created for video sync loss, black (loss of luminance), freeze-frame,
embedded audio loss, external audio loss, over level, out of phase (of chosen pairs), teletext
loss, and closed caption loss. The colors used for on-screen alarms are as follows:
If carrier loss occurs, only that alarm will flash, unless audio loss had already been active for
the same channel.
The decoding of closed caption is available on each scaler, together with an associated
alarm. Analog teletext decoding is available in the scaler.
On-screen alarm indication can be a stationary or flashing colored tile border. External alarm
indication may be via the GPI I/O or the LAN/software application, e.g. NGM-164.
Optional triggering of SNMP traps for each alarm function or group are also supported.
Tiles have an optional color coded border to provide status indication, such as tally or alarms.
VITC loss is indicated by the burnt in VITC display flashing. Burnt in VITC is available from
SDI sources only.
1.2.2 Captions and UMD
Captions or Under Monitor Display (UMD) information can be generated manually from a
keyboard connected to a front panel USB-2 port or automatically from remote sources via the
LAN, using browser software operating on a remote PC, or via the RS232/422 port using TSL
or other protocols. Up to two lines of UMD text can be left, center, or right justified and may be
placed anywhere in the tile.
1.2.3 Using Bitmaps
There is storage capacity (about 200Mb) for bitmaps. These can be used as backgrounds, or
to display station idents, etc. The bitmaps must be in bmp or png file format and can be
uploaded to the frame via the LAN. Up to four bitmaps may be displayed at any one time.
1.2.4 Keeping Time
Clock/date display data can be derived from several sources; the system clock, NTP
synchronisation, LTC, or VITC from a chosen SDI input.
If there is no LTC present, the frame searches the network for an NTP Server in the nearby
region (pool.ntp.org). If a server is found, the time is taken from that.
In the absence of any clock, the system time is used. A battery on the CPU board insures that
time data is retained if the unit be powered down.
For each input is possible to display either the Ancillary Timecode or the DVITC from the
video source.
Alarm
Color
Position
Audio Loss
Yellow
Position (left or right indicates channel)
Audio Over
Red
Position (left or right indicates channel)
Anti-Phase
Cyan
Middle Alarm
Carrier Loss
White
Middle Alarm
Table 1.
Alarms.
Note:
When LTC is present this source becomes the exclusive reference for clocks.
The input is balanced; to use an unbalanced LTC input, the signal must be properly
converted with a Balun in-line transformer. Grounding either of the LTC input pins will not
work.
Summary of Contents for MV-16
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Page 16: ...MV 16 Multiviewer www snellgroup com Installation Issue 1 Rev 12 Page 16 2013 Snell Limited...
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