Lucent Technologies FiberReach DDM-2000 User Manual

363-206-305
Circuit Pack Descriptions
Issue 3 June 2000
7-87
The 28G-U/28G2-U OLIU interfaces via VT-G signals with circuit packs in the low-
speed slots and via STS-1 signals with the circuit packs in the main and function
unit slots. It selects the signals from the service or protection slot of each pair as
directed by the SYSCTL.
Fault Detection Circuitry
7
The 28G-U/28G2-U OLIU circuit pack has in-service and out-of-service built-in
test capability. In-service testing is continuous, and errors are reported when they
occur to the SYSCTL via the intrashelf control bus. An out-of-service test is
performed whenever the OLIU circuit pack is inserted or recovers from a transient
failure.
The 28G-U/28G2-U OLIU has STS-1 and VT1.5 signal degrade protection
switching and STS signal degrade protection switching capabilities.
Performance Monitoring
7
The 28G-U/28G2-U OLIU provides PM circuitry for the following performance
parameters:
■
STS-1 section severely errored frame seconds (B1 SEFS) count
■
Line coding violation counts (B2 parity)
■
Line errored seconds
■
STS-1 path coding violation counts (B3 parity)
■
STS-1 path errored seconds
■
VT path coding violation counts (V5 parity)
■
VT path errored seconds.
Power Circuitry
7
Power for the 28G-U/28G2-U OLIU circuit pack is provided by three DC-to-DC
converters located on the 28G-U/28G2-U OLIU circuit pack. The converters
supply 5.5, 5, and 3.3 volts. Both A and B
−
48 volt backplane busses supply power
to the converters through diode ORed circuit pack-mounted power select circuits
and a circuit pack-mounted fuse. The 28G-U/28G2-U provides +5V power to the
low-speed slots. Failure of the fuse or converters causes the red FAULT LED to
light.

Lucent Technologies FiberReach DDM-2000 Specifications

General

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