10
LOCAL MUX-6
2. Introduction
2.1 General
The Local Mux-6 is a full-duplex time-division asynchronous multiplexor
enabling up to twelve async terminals to be multiplexed onto a single
channel. The Local Mux-6 is intended for use in manufacturing facilities,
building complexes, campuses, and other similar point-to-point applications.
2.2 Functional Description
The Local Mux-6 contains six sub-channels that can be expanded to twelve
through connection of channel-doubler cables. The number of channels
available (6/12) is set by a user-selectable strap.
When the unit is set for six channels, each channel can be used to transmit
full-duplex data end to end. When the unit is set for twelve channels, each
sub-channel can be used for either data or control-signal transmission,
according to the specific application. For example, six channels can be used
to transmit full-duplex data and six can be used to transmit control signals
end to end, or else the full twelve channels can be used to transmit full
duplex data end to end.
The Local Mux-6 comes with a 4-wire terminal block for transmission over
two twisted pairs.
Multiplexing is implemented using an over-sampling technique.
Each of the twelve channels is sampled at 78.6 kbps.
Table 2-1
summarizes Local Mux-6 performance.
NOTE
Whenever possible (if the number of channels is less than or equal to 6),
we recommend that you operate the Local Mux-6 in the six-channel
mode, which results in less distortion.
