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CPP100
SECTION 7
CPP1OPS
25/10/06
www.snellwilcox.com
Version 1 Issue 6
7.3
RollTrack
RollTrack is a feature of RollCall™ (Snell &
Wilcox’s proprietary remote control system).
It enables Snell & Wilcox RollCall compatible audio
delay products to track delay introduced by RollCall
compatible video processing products.
The simplest configuration is a single video unit
and a single audio delay in a RollCall system. The
audio delay will have the same delay as through
the video path. If the delay changes the audio
delay will track.
The next level of configuration is where there are
multiple Frame Synchronizers (for example) each
connected through RollCall to their own tracking
Audio Delay. (It is worth stating that the
synchronizers and audio delays do not have to be
in the same enclosure; the addressing scheme,
discussed later, allows for the units to be
positioned anywhere in the RollCall domain.)
The maximum number of video units and audio
delays in a RollCall system is set by the maximum
limit of the number of modules in a RollCall
network and is currently 3840.
The next level of complexity is
a vertical delay
cluster
where a video unit can have up to eight
audio delays tracking - of the same or different
types.
From one to eight audio delay products can be
connected via RollCall to a single frame
synchronizer, for example. If the synchronizer
delay changes, then however many audio delays
are connected will track the delay. The audio
delays can also have a manual delay which will be
added to the RollTrack delay.
The next level of complexity is
a horizontal delay
cluster
where an audio delay can track up to four
video units.
The total delay time through the audio delay is then
the sum of the individual delays introduced by the
video units plus the manual delay of the audio unit.
The manual delay can be set to compensate for
any fixed propagation delay in the video path or
may be set to zero.
The next level of complexity is a
matrix delay
cluster
where each audio delay (up to eight) can
track up to four video units. This configuration is in
effect a four by eight matrix of video units and
audio delay units. The total delay time through the
audio delay units is then the sum of the individual
delays introduced by the video units plus the
manual delay of the audio unit.
As any of the delay times change in the video path
so will the audio delay time track this delay.
A virtual connection is by:
selecting the
Setup...
Menu
then selecting the
Audio_Delay...
Menu
then choosing from
Unit_1
to
Unit_8
then entering the unique network address in the
form
nnnn:xx:yy*z
where
nnnn =
network address and in
most cases will be 0000;
xx
= Enclosure address;
yy
=
slot
address
z =
the connection (or channel)
number - see table below.
then selecting
Delay...
Menu
then selecting
Auto
Example of Network Addresses with Channel
Numbers
D1FSY 1
D1FSY 2
Audio delay
1
0000:10:01*14
0000:10:01*15
Audio delay
2
0000:10:03*14
0000:10:03*15
Audio delay
3
0000:10:05*14
0000:10:05*15
Audio delay
4
0000:10:07*14
0000:10:07*15
Audio delay
5
0000:10:09*14
0000:10:09*15
Audio delay
6
0000:10:0B*14
0000:10:0B*15
Audio delay
7
0000:10:0D*14
0000:10:0D*15
Audio delay
8
0000:10:0F*14
0000:10:0F*15
D1FSY 3
D1FSY 4
Audio delay
1
0000:10:01*16
0000:10:01*17
Audio delay
2
0000:10:03*16
0000:10:03*17
Audio delay
3
0000:10:05*16
0000:10:05*17
Audio delay
4
0000:10:07*16
0000:10:07*17
Audio delay
5
0000:10:09*16
0000:10:09*17
Audio delay
6
0000:10:0B*16
0000:10:0B*17
Audio delay
7
0000:10:0D*16
0000:10:0D*17
Audio delay
8
0000:10:0F*16
0000:10:0F*17