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Lucent Technologies DDM-2000 OC-12 User Manual

Lucent Technologies DDM-2000 OC-12
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363-206-295
Power
4-4 Issue 1 December 1997
LEDs 4
Two green power on (PWR ON A and PWR ON B) LEDs on the Group 4 shelf
user panel indicates that the shelf is receiving fused 48 volt power. The LEDs will
remain illuminated as long as either 48 volt feeder is supplying power to the
shelf.
Normally the FAULT LED on the circuit pack faceplates is operated via the
controller which provides a ground return for current generated by the on-board
converter. In the event of a DC-to-DC converter failure, the LED will be operated
via the 48 volt power leads. The 48 volt power leads are supplied through an
electronic gate or relay contact normally held open by the converter. The power,
fusing, and LED circuits shown in Figure 4-2 are used on all circuit packs with on-
board DC-to-DC converters.
Figure 4-2. Circuit Pack Power and LED Control
Power Minor Alarm 4
A yellow power minor (PMN) alarm LED is provided on the user panel to indicate
an AC power failure at the remote terminal. The PMN alarm can be provisioned by
a switch on the SYSCTL circuit pack at the central office (CO) to be either an
office minor (MN) or office major (MJ) alarm.
-48 V (A)
RTN
&
+5 V
Relay
Converter
GND
DC/DC
-48 V-48 V
-48 V (B)
(Red)
&
Fault LED
LED Control
Filtering
Fuse
Limiter
Current
ORing
Diode
RTNRTN

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Lucent Technologies DDM-2000 OC-12 Specifications

General IconGeneral
BrandLucent Technologies
ModelDDM-2000 OC-12
CategoryMultiplexer
LanguageEnglish

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