System Status; Circuit Assurance - Multitech MultiDSU56K MT56DSU-R Owner's Manual

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MT56DSU-R Owner's Manual
3.2.5

System Status

With this option enabled, the MT56DSU-R conditions the DSR
signal with additional parameters to provide added information to
the connected DTE concerning the Ready status of the
communications channel. Normally when this option is enabled, this
signal is on when the MT56DSU-R is powered on and not in test
mode.
On most modems, the Data Set Ready (DSR) signal at the DTE
interface is used to provide a basic indication of the modem actually
being ready to transfer data. The System Status option simply
provides a better means of informing the DTE of a ready condition.
The default for this function is System Status disabled, preventing
the DTE from interpreting momentary line interruptions as a
communications channel failure. (Refer to Chapter 2 for changing
the default DIP switch settings.)
3.2.6

Circuit Assurance

This option, when enabled, causes the MT56DSU-R to condition the
CTS signal to inform the DTE of the transmit ready status of the
entire communications channel.
In most installations, the CTS signal at the DTE interface is the
basic RTS signal delayed in time. Even though this could imply that
the communications channel is ready for data to be sent, it is not
typically conditioned by channel status to indicate an actual “ready”
status.
With the Circuit Assurance function enabled, the MT56DSU-R does
not turn the CTS signal on unless both the CD is on and the RTS/
CTS delay has timed out.
The default for this function is Circuit Assurance disabled. (Refer to
Chapter 2 forchanging the default DIP switch settings.)
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