A-26 Issue 4 February 1997
363-208-011
Applications
Operations Systems Interfaces
The
SLC
-2000 System supports office alarms, parallel telemetry, user-selectable
miscellaneous discrete telemetry, serial telemetry, and a message-based
operations system interface (X.25 protocol).
The office alarms interface is a set of discrete relays that control office audible and
visual alarms. Separate relays handle critical, major, minor, and power minor
alarms. The critical and major alarms can be wired together and the minor and
power minor, likewise, if requested.
Parallel telemetry brings a large set of alarm and status information to an
operations center using contact closures. Fifty nine relay closures show alarms,
status and site IDs.
The miscellaneous discrete interface allows the
SLC
-2000 system to control and
monitor collocated equipment. There are 16 alarm/status inputs and 4 control
outputs that can monitor conditions like open doors, high temperature, low fuel,
etc. and four control outputs that can control equipments like fans, generators,
pumps, etc. These miscellaneous discrete scan and control points can be
reported on demand through the customer interface terminal (CIT).
Serial telemetry is provided using the telemetry byte-oriented serial (TBOS)
protocol. The TBOS telemetry transfers alarm, status, control and performance
monitoring information to and from a remote maintenance center via a 2400-baud
RS-422 port.
The X.25 message-based interface supports Transaction Language 1 (TL1) which
has more flexibility and provides more detailed alarm, status and control
capabilities than parallel and serial telemetry interfaces. TL1, TBOS, and parallel
telemetry interfaces communicate alarm, status, performance monitoring, and
control information to/from alarm surveillance Operations Systems (OS's). In
Regional Bell Operating Company (RBOC) applications, the alarm surveillance
OS is typically Network Monitoring and Analysis
*
(NMA
).
SLC
-2000 COT uses parallel and discrete telemetry to communicate with a
telemetry remote unit and the telemetry remote unit communicates with the OS.
The TL1 and TBOS interfaces communicate directly with the OS.
* Registered trade mark of Bell Communication Research, Inc.
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