Northern Telecom DMS-100 Series Installation And Maintenance Manual page 27

Digital switching systems
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Desktop DUs provide an interface between data terminal
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(DTE) and a two-wire non-loaded loop.
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loop using time compression multiplexing (TCM).
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ogy provides a data channel that is capable of handling data at a
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rate of 64 kbps with an 8 kbps signaling channel.
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The RS-232C desktop DUs can transmit data in any of three modes:
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*
synchronous
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*
asynchronous
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*
asynchronous autobaud
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Transmission speeds are selectable up to 19.2 kbps.
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chronous autobaud mode, the DU adapts to the speed of the DTE and
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supports the following speeds:
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*
50 bps
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*
75 bps
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*
110 bps
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*
134.5 bps
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*
150 bps
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*
300 bps
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*
600 bps
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*
1200 bps
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*
1800 bps
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*
2000 bps
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*
2400 bps
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*
3600 bps
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*
4800 bps
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*
7200 bps
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*
9600 bps
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*
19200 bps
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In
the
asynchronous
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data with odd, even or no parity.
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The V.35 desktop DUs are can transmit data
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kbps, 56 kbps, or 64 kbps.
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Both the RS-232C and V.35 DUs transmit in full-duplex mode (half-
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duplex is supported).
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The
desktop DU is packaged in a plastic housing for installation
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on a desktop, or on the wall.
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supply
that
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The power supply is placed on the floor.
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on
the
DU
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switches are used to set
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User
instructions
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underside of the lid.
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Profile downloading, if available,
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downloaded
from
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autobaud
connects
to
a standard 110 V ac power receptacle.
that
conceals the option selector switches.
DU
are printed on a quick-reference panel on the
the
NT6X71AB data line card (DLC).
Data is transmitted on the
mode, the data unit can transmit
synchronously
It has an attached external
There is a flip-up
options
and
transmission
allows
some
297-2121-226
VINTAGE 05.01
equipment
The TCM technol-
In the asyn-
at
48
power
lid
These
speeds.
options
to
be
Additional
3-7

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