Specifications

On-Line Operation
6-11
Press the Escape button to return to the Channel Status submenu.
20. Press the button beneath Assgn. The screen then displays the port's multidrop
channel assignment. If a name has been assigned to the channel, the name will
appear in place of the channel number.
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C h a n n e l S t a t u s
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Line Quality Statistics
The Line Quality Statistics (LQS) feature allows you to measure and display the quality
of a transmission line from a CMS system console or the DAP's front panel. This feature
provides information that allows you to measure the percentage of time your network is
available for use and allows you to identify specific digital line problems and bad lines.
When troubleshooting networks, DAP diagnostic functions can be used in conjunction
with information derived from LQS for isolating problems as described in Chapter 7.
From a CMS system console, you can monitor historical graphic displays of the
following line availability statistics:
• Percentage of time transmit levels, receive levels, and signal quality are within
predefined thresholds.
• Percentage of time the DDS circuit is available for use.
• Percentage of time the DAP is receiving a valid signal from the network.
• Number of Out of Service codes, Abnormal Station codes, network framing
errors, and unknown control codes received.
• Number of multiport/multidrop resynchronizations for each drop and total
number of multiport/multidrop resynchronizations.
• Number of times the central DAP has resynchronized the entire network (global
resync count).
• The address of any remote unit the central unit has lost communication with on a
multiport/multidrop circuit.