CTI Products MCN RCD System Overview - Manual (Page 33)

MCN System Manual Hardware Installation
CTI Products, Inc.
68-10833-120
29
CTI part numbers.
If you do provide your own cable, be sure it meets the specifications above. The
system will not work with ordinary telephone cable.
If you are providing your own cable for a run longer than 100 feet, a new power
supply will be required at the far end. You may use 2-pair Level IV or Level V
cable instead of 4-pair. In this instance, connect just the data pair (Pins 1 & 2).
7.5 Power Requirements
Power input for all MCN modules is 10 to 32 VDC, with most modules requiring
no more than 2 W (refer to the module’s hardware reference manual for exact
input power requirements). CTI Products has plug in power supplies available
that provide 18 VDC at 800 mA. MCN systems have been fully tested for
appropriate immunity to harmful electrical noise and electrical impulses when
assembled with these power supplies only. Operation with other, non-qualified
power supplies could yield lower system performance and may void US and
Canadian emissions and European emissions and susceptibility approvals.
The DC IN receptacle of all MCN modules can accept either polarity
configuration from the input power plug.
The MCN system provides a unique way to distribute power to multiple modules
from a single power supply. The network cable used for module communication
also contains power lines so that the power from a power supply can be
distributed along with the communication lines. The limits of this power
distribution are the following:
• A maximum of four modules can be powered from a single power
supply.
• The maximum cable length between the modules that share a power
supply is 100 feet.
Note: The EXB module, because of its higher power requirements, counts as two
module loads when distributing power through the network cable. Therefore, one
power supply could be used to power one EXB module plus two other modules.
To create this power distribution (refer to Figure 13), simply connect the power
supply into your first module. Then, connect the NETWORK OUT port of that
module to the NETWORK IN port of the next module. Continue connecting
NETWORK OUT ports to NETWORK IN ports until all modules are connected.
If you need to add more power supplies to the system due to power distribution
limits, simply connect another power supply into the DC IN port of a module.
This new power supply then provides power for the module it is connected to as
well as all modules from that module’s NETWORK OUT port or until another