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Operations Interfaces
6-16 Issue 3 June 2001
User-Definable Miscellaneous Discretes—
Environmental Alarms and Controls 6
To allow monitoring and control of equipment in a DDM-2000 OC-3 Multiplexer, a
set of user-definable miscellaneous discrete environmental alarms and controls is
provided.
Twenty-one miscellaneous discrete alarm/status points are provided to monitor
environmental conditions in a DDM-2000 shelf (open door, high temperature,
etc.). The first 14 points and points 16 through 21 are activated by contact
closures. The fifteenth point (External Minor) is for monitoring of remote structure
power and fan apparatus (for example, DC power shelf failure); this point is
activated by a −48 volt input.
Four control points are provided to control equipment (pumps, generators, etc.) at
remote terminal sites. When activated, the control points provide a contact closure
between the control point output and ground.
OS access to all miscellaneous discretes alarm/status points (1 through 21) is
provided via TL1/X.25. Figure 6-4 shows OS access to miscellaneous discretes
through the DDM-2000 Multiplexer at the CO. Access to all miscellaneous
discrete alarm/status points is also provided through the CIT. The state of the
control points can be reported, but not controlled, through the CIT; control points
are activated by the TL1 command “OPR-EXT-CONT.”
The names and alarm levels of the 21 alarm/status points and the names of the
four control points can be provisioned through the CIT in remote systems. (Refer
to the set-attr-env, set-attr-cont, rtrv-attr-env, and rtrv-
attr-cont commands in Section 11, "Commands and Reports.")
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