Installing a Stinger MS+
System clocking
Stinger® MS+ Getting Started Guide
2-7
System clocking
The control module has four possible timing sources:
■
External. The Stinger unit can accept timing from a T1 line, or a building
interoffice timing source (BITS) clock, connected to the alarm module BITS
connectors. (See Figure 2-6.)
■
Trunk. The Stinger unit can accept timing from an OC3, DS3, or E3 line clock.
■
LIMs. The Stinger unit can accept timing from an ADSL or SDSL line clock.
■
Internal clock source. If the selected clock sources fail, the system is automatically
reconfigured so that it is synchronized with the control module’s internal clock.
The T1 or BITS timing inputs work with DS1 timing references that comply with the
ANSI T1.102 standard. The system timing is configured through the TAOS
command-line interface. For detailed information about the profile and options that
configure system clocking, see “Configuring system clocking” on page 5-14.
Alarm monitoring
There are two groups of alarm connections on the Stinger MS+. One group, on the
chassis alarm module, communicates the major or minor alarm status of the Stinger
MS+ unit to an external system or status indicator. The Stinger MS+ can use another
group of connections on a revision 2 or revision 2.1 control module to monitor and
report the alarm status of up to seven other external systems.
Connecting to monitor Stinger unit alarm status
The alarm module on the front of the unit, in the lower right corner, contains three
sets of connectors for connecting the following:
■
Major alarms
■
Minor alarms
■
External BITS clock
The alarm module along with its BITS and alarm connections is shown in Figure 2-6.
Figure 2-6. Stinger MS+ alarm module
The alarm module contains alarm terminals for monitoring the status of the Stinger
MS+ unit. The Stinger MS+ can monitor itself for major and minor alarm conditions
and illuminate appropriate status lights on the control module. In addition, you can
connect audio and visual alarms to the normally open or normally closed alarm relay
contracts of the alarm terminals to remotely monitor the unit for these conditions.
BITS
MINOR
MAJOR
NC
COM
NO
NC
COM
NO
