Harris ACS-163, Installation & Operation Manual

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2 – Functional Description ACS-160 Series & STL-160 Series T1 Multiplexer Installation & Operation
Version 2.11, August 2011
Harris Corporation 2-21
Intraplex Products
incoming demultiplexed digital information from its designated time slot(s) on the receive bus on the
midplane and converts it back to its original format for output.
2.1.6.1 Simplex versus Duplex Channel Modules
Most circuit types, such as voice and two-way data circuits, are full-duplex;* that is, they support
simultaneous two-way operation. Full-duplex circuits require identical full-duplex (transmit/receive)
channel modules at both ends of the channel they occupy within an ACS-160 system. Other circuit
types, such as program audio channels, are simplex; that is, they always have a transmitter module
at one end and a receiver module at the other. Figure 2-13 shows multiple channel modules of various
types in a three-site system, using both terminal and drop and insert multiplexers.
* Most full-duplex (two-way) channel modules can also be set up to operate in a simplex (one-way)
mode.
Figure 2-13. Channel Module Direction and Time Slot Settings
2.1.6.2 Channel Modules in Point-to-Point versus Point-to-Multipoint Circuits
Most ACS-160 system circuits are point-to-point. However, you can configure several channel module
types for point-to-multipoint operation. For example, you can set up a single program audio
transmitter module and several program audio receiver modules in a point-to-multipoint or
broadcast
circuit configuration, allowing multiple locations to receive the same program audio signal without the
need for tandem decoding and re-encoding at each receive site. To achieve the point-to-multipoint
configuration, set all the receive modules to the same time slots as the transmit module. Similarly,
data polling channel modules can be used to configure point-to-multipoint data circuits. In this
arrangement, all the polling modules are set to use the same time slot, but each responds only when
it receives the Request-To-Send (RTS) signal.