ACS-160 Series & STL-160 Series T1 Multiplexer Installation & Operation
2 – Functional Description
Version 2.11, August 2011
2-22
Harris Corporation
Intraplex Products
2.1.6.3 Relationship between Circuits and Time Slots
The T1 circuit consists of twenty-four 64 kbps time slots in each direction (Section 2.2.1 –
T1 Digital
Transmission
). Some channel module types use a single time slot to provide one or more circuits. For
example, a single-port data module may use one time slot to transmit one data circuit operating at 64
kbps, while a five-port data module may use one time slot to transmit up to five data circuits, each
operating at 9.6 kbps.
Other channel module types require multiple time slots per circuit. For example, wideband data
modules may be configured to operate at rates up to 1.536 Mbps and therefore may use from one to
twenty-four time slots, simplex or full duplex, within a given T1 circuit. Similarly, high fidelity audio
channel modules may use up to eighteen time slots to support one 15 kHz, CD-quality stereo circuit.
Remember, however, that one-way channels (high fidelity audio modules and data modules operating
in simplex mode) use time slots in one direction of the T1 circuit only; the same time slots remain
available for other one-way channels in the return direction.
2.1.7
Module Adapters
All common and channel modules use plug-in module adapters to provide the connectors for the
individual and aggregate channel interfaces. In most cases, one module adapter is required for each
module on a one-to-one basis; however, certain module adapters provide connections for more than
one module. Power supply modules require no module adapters.
All module adapters have the same connector on their front edge to mate with the shelf midplane, but
some module adapters have different rear edge connectors, providing a variety of interfaces (Figure 2-
14).
Figure 2-14. Module and Module Adapter Insertion in 3RU (Side) or 1RU Chassis (Top)
For some channel modules, one specific module adapter must be used to provide the correct
connector(s). Other channel modules are compatible with several different module adapters, each
providing a different interface. Each individual channel module manual describes the module
adapter(s) available for that module.
Warning!
Hot insertion or removal of a module adapter while a channel module is in place is not
recommended, as it could damage the channel module or the module adapter. To
remove a module adapter while the system is turned on (has power), first remove the
associated channel module. Similarly, to install a new channel module, first install the
module adapter and then install the module itself.
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