Model 5601ACO2 Automatic Changeover Unit
OVERVIEW Revision 1.2 Page 1-1
1. OVERVIEW
The 5601ACO2 Automatic Changeover is intended to be connected directly to two 5601MSC Master
Clock / Sync Generators as shown in Figure 2-2. The 5601ACO2 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 above recommended practices provide the highest degree of protection by minimizing the number
of point of failure connections within your plant referencing system. If you wish to modify your
referencing system from the recommended design, please consult the factory prior to implementation
to ensure your system’s maximum reliability is maintained.
The front panel has one pushbutton. This button shows the last state which caused a changeover.
This is to assist with diagnostics in cases where the problem has cleared before an operator can
observe the front panel. Seventy LEDs provide status information as to the health of the two
5601MSCs, 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 main circuit board has three switches, behind the front 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 5601MSCs are scrutinized to detect any abnormal signals. For
example if a level, pulse width, phase, time code error or other abnormality is detected, the 5601ACO2
circuitry will trigger and the entire bank of signals will be switched to the backup 5601MSC. In manual
mode the changeover can be operated from a GPI or from the front panel switch.
The 5601ACO2 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.
The 5601ACO2 offers connections for 6 colour black, (or bi-level or tri-level sync signals, or 10 MHz or
pulses or word clock), 1 10MHz , 1 Word clock, 8 SD/HD/3G SDI test signals, 2 analog video test
signals, DARS, 2 AES, analog audio, and two linear time codes (LTC) to each of the two Master
5601MSCs. Each 5601MSC Master offers two LTC outputs that may be used for different time codes.
All four LTC signals are fed to the 5601ACO2 on two 'D' connectors, one for each Master. The LTC
outputs from the selected master are available on two XLR connectors. There is an XLR for LTC input
which will feed this signal to both 5601MSCs. The Word clock and 10 MHz inputs can also monitor bi-
level, tri-level sync signals. Each 5601MSC provides 2 GPO signals which are also on the ‘D’
connectors. The 5601ACO2 feeds these signals through to the 2 x 8 terminal blocks. Each 5601MSC
is equipped with 2 GPI inputs and 2 GPO outputs. To facilitate installation, these connections are
connected through to a 2 x 8 pin terminal block on the 5601ACO2. The outputs from the 5601MSCs
are passed straight through the 5601ACO2. The 5601ACO2 can monitor these signals and include
them in the decision making process. Inputs to the 5601MSCs are internally split by a 'Y' connector to
ensure that both 5601MSCs receive the same GPI contact closures.
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