Model 5600ACO2 Automatic Changeover Unit
1. OVERVIEW
The 5600ACO2 Automatic Changeover is intended for use with two 5600MSC Master Clock / Sync
Generators. The 5600ACO2 system uses latching relays to ensure maximum reliability and minimal
disruption in the event of any failure. The complete system provides the highest level of security for
television station video and time synchronization systems. Two power supplies are included as a
standard feature, to alleviate any single point of failure concerns.
The front panel has three switches, recessed into the panel for added security. There is an AUTO /
MANUAL switch, a GPI / FRONT PANEL switch and an A / B select switch for manual changeover. In
automatic mode, all signals from both 5600MSCs are scrutinized to detect any abnormal signals. For
example if a level, pulse width, phase, time code error or other abnormality is detected, the 5600ACO2
circuitry will trigger and the entire bank of signals will be switched to the backup 5600MSC. In manual
mode the changeover can be operated from a GPI or from the front panel switch. Fifty-Six LEDs
provide status information as to the health of the two 5600MSCs, together with indication as to which
one is active. In addition two GPO outputs indicate which master is active and when the inputs from
both masters are not the same.
The 5600ACO2 features selectable voting via VistaLINK
®
for auto-changeover feature. Individual
inputs may selectively be included or excluded in the voting process to drive auto-changeover logic.
(Feature only available on 5600ACO2 model).
The 5600ACO2 offers connections for 6 colour black, (or bi-level or tri-level sync signals), 4 HD SDI
test signals, 4 SDI test signals, 1 analog video test signal, Word Clock, 10MHz, DARS, AES, analog
audio, and two linear time codes (LTC) to each of the two Master 5600MSCs. Each 5600MSC Master
offers two LTC outputs that may be used for different time codes. All four LTC signals are fed to the
5600ACO2 on two 'D' connectors, one for each Master. The LTC outputs from the selected master are
available on two XLR connectors.
Each 5600MSC is equipped with 2 GPI inputs and 2 GPO outputs. To facilitate installation, these
connections are connected through to a 2 x 6 pin terminal block on the 5600ACO2. The outputs from
the 5600MSCs are passed straight through the 5600ACO2. The inputs to the 5600MSCs are internally
split by a 'Y' connector, to ensure that both 5600MSCs receive the same GPI contact closures.
In the event of a changeover occurrence, it is necessary that all outputs on one 5600MSC have the
same timing as those on the other. Identical timing for both 5600MSCs is assured by locking both to the
same frequency and phase source (e.g. GPS or by genlocking one 5600MSC to the other). Identical
phasing of the independent black outputs is assured by implementing the Syncro mode in the
5600MSCs. To use this mode, both 5600MSC communication ports are connected together using the
link cable supplied with the 5600ACO2. With both 5600MSCs operating in Syncro mode, timing
adjustments made to one 5600MSC will be automatically applied to both. The link cable is connected
permanently, so that any system re-timing will be applied to both 5600MSC units.
OVERVIEW
Revision 1.3 Page 1-1
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