363-206-305
Circuit Pack Descriptions
7-92
Issue 3 June 2000
RGU Circuit Pack Description
7
This circuit pack provides 20 Hz negative superimposed ringing voltage to satisfy
loop applications up to 132 ohms. The RGU receives an input voltage from the
power converter unit (PCS) and supplies ringing voltage to three lines
simultaneously. Each line may have a maximum load of five ringer equivalent
numbers (RENs). An output alarm monitor circuit on the RGU monitors the output
ringing for an over- or under-voltage condition and activates a red fail LED when
either condition occurs. The circuit pack is protected from lightning and power
surges by the output surge protection circuit.
NOTE:
The AUA423 is available to be placed in a Narrowband shelf where any
channel units are used whose range exceeds 132 ohms.
RGU Faceplate Controls and Indicators
7
The RGU circuit pack faceplate controls and indicators are shown in Figure 7-36.
Figure 7-36. AUA413 RGU Circuit Pack
PCU Circuit Pack Description
7
This circuit pack is located on the Narrowband shelf and accepts -48V DC power.
It converts -48V DC to +5 and -5V DC, as well as -25.5V DC for use by various
channel units that may be in the Narrowband service card slots. The PCU
provides power to all the circuit packs on the Narrowband shelf by converting
incoming -48V DC power to voltages required for the various circuit packs.
The BGW1 PSU, miscellaneously mounted with the DDM-2000 FiberReach shelf,
terminates a 60V AC from a network-provided source (for example, centralized
FAIL
-48V
GND
-20HZ
RGU
Lucent
AUA413
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