OAS alarm and Control Circuits 6-5
DMS-100 Family Alarm System Description Reference Manual BASE12
In the Version 2 OAS, remote dead system indication is provided in one or
more of the following ways:
• You can install the OAU alarm transfer (NT3X83) card and activate the
remote alarm transfer feature. Chapter 3 contains a description of the
NT3X83 card. If a dead system alarm condition occurs, the system
sends a major alarm indication to the monitoring office.
• You can install the OAU alarm sending card (NT3X84). Chapter 3
contains a description of the NT3X84 card. If a dead system alarm
condition occurs, the system sends an alarm indication to the remote
monitoring location. This process is described in the Dead system alarm
section of this chapter.
• The alarm sending and checking (software) feature, described later in
this chapter, provides the dead system alarm indication.
In the EAS, make and break remote alarm contacts are available on the
NT3X82AC and NT3X82AD cards. These contacts activate when the
system detects a dead system condition. The contacts control external
equipment. Arrangement of the contacts is through a common lead that
connects to both the make and break contacts.
FSP/MSP alarms
Each frame supervisory panel (FSP) or modular supervisory panel (MSP) in
an office has alarm circuits that monitor the office battery and alarm battery
supply (ABS) fuses on that FSP (frames) or MSP (cabinets). These alarm
circuits monitor the alarm leads from equipment mounted in the frame or
cabinet. The alarm circuits light the appropriate frame or cabinet fail, fan
fail, or converter fail lamps when the alarm system detects a failure. The
alarm circuits also provide an output on the aisle alarm loop. Several types
of FSP or MSP can meet the power and fusing requirements of equipment
on different frame or cabinet types. These FSP or MSP types can detect
alarm conditions associated with equipment on different frame types.
The system multiples the aisle alarm loop for each equipment aisle from
frame to frame or cabinet to cabinet. This paralleling occurs through control
relay contacts in the alarm circuit of each FSP or MSP in the aisle. The aisle
alarm loop directly controls end-aisle pilot lamps for each aisle light. If an
FSP or MSP in the aisle detects a fault, the aisle alarm loop closes and the
end-aisle pilot lamps light.
The aisle alarm loop for each aisle in the office also connects to an FSP or
MSP alarm scan point in the OAU through one of the following:
• connectorized cables and the alarm crosspoint field or alarm
cross-connect unit shelf. See Figure 2-2 for further details.
• distribution frame (DF)
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