363-206-305
Circuit Pack Descriptions
7-72
Issue 3 June 2000
Control Circuitry
7
The 22-type OLIU circuit packs interface with the BBG8/BBG8B SYSCTL circuit
pack in the FiberReach shelf.
The 22-type OLIU circuit packs provide maintenance elements for reporting the
status of the circuit pack, status of the incoming optical and electrical signals, as
well as inventory information (
CLEI
code, date of manufacture, etc.). These
maintenance elements are used by the SYSCTL for fault detection and isolation.
Conversely, the 22-type OLIU circuit packs respond to control signals from the
SYSCTL, such as STS-1 routing, protection switching, and LED control
commands.
The 22D-U OLIU circuit pack accesses the SONET transport overhead and routes
it via the transport overhead channel interface to the SYSCTL.
Protection Circuitry
7
The 22-type OLIU circuit packs operate in the unprotected (0x1) configuration only
in the FiberReach shelf.
Fault Detection Circuitry
7
The 22-type OLIU circuit packs have 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 intra-shelf control bus. An out-of-service test is
performed whenever the OLIU circuit pack is inserted or recovers from a transient
failure.
Performance Monitoring
7
The 22-type OLIUs provide PM circuitry for OC-3 and IS-3 performance
parameters.
Power Circuitry
7
Power for the 22D-U OLIU circuit pack is provided by a DC-to-DC converter
located on the circuit pack. The converter supplies +5 volts and
−
5.2 volts.
Power for the 22F-type OLIU circuit packs is provided by two DC-to-DC converters
located on the circuit pack. One converter supplies +5 volts and the other supplies
−
5.2 volts.
Power for the 22G-type OLIU circuit packs is provided by two DC-to-DC
converters located on the circuit pack. The converters supply +5 volts.
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