AEQ DIGITAL COMMENTARY UNIT Customer's Manual page 45

• REMOTE INTERCOM:
Bantam-Jack type connectors for remote intercom are also found on this
module. The intercom is wired through a bus tie-line, the jack IN defines the 4
wire signal input from the external intercommunicator at line level (0 dB
nominal). The connector OUT carries the output signal to the
intercommunicator, also at line level. All the remote intercom CCU inputs as
well as the outputs are therefore wired in parallel.
The remote intercom connectors are wired as follows:
Tip: Signal V+
Ring : Signal V-
Sleeve: Ground
For both input and output jacks
• SYNC
When different CCUs are used at the same venue, the use of a single
synchronous clock source for the whole installation is recommended. For this
purpose there are two BNC connectors on each CCU. The first one, SYNC IN,
serves for the connection of an external clock source. The second one, SYNC
OUT, can be used for connection to the next CCU SYNC IN. The cable must be
have 50Ω impedance (RG-58 or similar).
If a valid clock signal is applied at SYNC IN, the CCU synchronizes its own
internal clock to the external master signal, while at the same time generating a
sync signal at SYNC OUT. If no external master clock is used, the CCU
generates its internal clock and makes it available at SYNC OUT, in such a way
that the first CCU can be used as the master clock source for the whole system.
If the previously described daisy chain becomes broken by cable disconnection
or equipment malfunction, the next available CCU will generate the master
clock signal for the remaining CCUs.
• RS 485 CONTROL PORT
(See information regarding control software in chapter 4 of this manual).
This is a bus type control cable formed by a simple pair of wires. Care must be
taken to maintain the correct signal polarity (V+ and V-). This connection simply
arranges all the CCU in parallel. The use of a shielded twisted pair is
recommended, but a simple pair will work well in most cases. The Input
connector accepts direct wiring, so no special connectors are required for this
purpose.
Digital Commentary System
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