Power and cooling equipment
21
Quantity--One
Peripheral Equipment Power Supply AC is used in each of
the following AC modules:
-
Intelligent Peripheral Equipment Module (NT8D37AA)
-
Peripheral Equipment Module (NT8D13AA)
-
NT8D21AA Ringing Generator AC
System Hardware-All
Purpose-The
Ringing Generator AC operates from a nominal 208/240
VAC input and provides selectable AC ringing voltage outputs
superimposed on -48 VDC. The frequency and voltage options are
20/25/50 Hz and 70/80/86 VAC. It also supplies -15OV DC Message
Waiting lamp 500/2500 set applications. The Ringing Generator AC
mounts in the PE modules to the right of the Peripheral Equipment Power
SUPPlY.
Quantity-One
Ringing Generator AC is used in each of the following,
when these AC Modules support 500- or 2500~type analog sets:
-
Intelligent Peripheral Equipment Module (NT8D37AA)
-
Peripheral Equipment Module
(NT8D13AA)
.-
NT8D22AB System Monitor
System Hardware-All
except System option 21A
Purpose-The
NT8D22AR System Monitor monitors the status of
ail
internal power and cooling related components, as well as external DC
rectifiers, batteries, and Uninterruptable Power Supplies (UPS). The
System Monitor is mounted in the Power Distribution Unit, within the
Pedestal.
The System Monitor that handles the communication with the system CPU
(via SD1 port) is the master; all others function as slaves. There is a serial
communication link between the master and the slave System Monitors. In
addition to CPU status reporting, the System Monitor also controls all
external visual status indications.
Quantity-One
master and up to 63 slave System Monitors are allowed per
system.
Equipment identification and ordering information 553-3001-154
..