Lucent Technologies FiberReach DDM-2000 User Manual

363-206-305
Power
4-10
Issue 3 June 2000
Narrowband Shelf Transmission Circuit Packs
4
FHB2 Digital Signal Cross-Connect Backplane
Interface Unit (DSXBIU)
4
The DSXBIU is a narrowband shelf circuit pack that operates as the local
controller for the narrowband shelf and multiplexes the DS0 signals from the
channel units to DS1 interfaces. The DS1 interface is fed from the DSXBIU to a
DS1 circuit pack on the wideband shelf. Software for the DSXBIU is automatically
downloaded from the
SLC
-2000 host digital terminal
.
The DSXBIU interfaces to the 12 channel units on the narrowband shelf, providing
provisioning and inventory information, as well as clock generation and
synchronization. The DSXBIU communicates with the common units via a serial
protocol microwire link. A separate microwire RS-422 interface connects with the
power supply unit. A bank control link on the DSXBIU is used to communicate with
the channel units.
The CDTU also contains a drop test circuit to determine the health of the metallic
drop beyond the local DDM-2000 FiberReach shelf. The CDTU can detect the
following:
■
Hazardous voltage
■
Foreign voltage
■
Metallic leakage
■
Receiver off-hook
■
Lack of continuity to the station set.
The circuit pack contains a red fail LED to indicate an internal failure in the CDTU
circuit pack and a green busy LED to indicate that a test session is active.
AUA432 Power Converter Unit (PCU), BGW1
Power Supply Unit (PSU)
4
The AUA432 PCU is located in the narrowband shelf and accepts
−
48 V DC
power. The PCU converts incoming
−
48 V DC to +5 and
−
5 V DC, as well as
−
25.5 V 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
−
48 V DC power to voltages required
for the various circuit packs.
The BGW1 PSU, miscellaneously mounted with the DDM-2000 FiberReach shelf,
terminates a 60 V AC from a network-provided source (for example, centralized
power). The PSU converts incoming 60 V AC to
−
48 V DC for use by the
wideband and narrowband shelves. In applications where
−
48 V DC is readily
available, the PSU is not required. Other powering options will be available with
future releases of the PSU.

Lucent Technologies FiberReach DDM-2000 Specifications

General

Brand	Lucent Technologies
Model	FiberReach DDM-2000
Category	Multiplexer
Language	English