363-206-285
Circuit Pack Descriptions
7-106 Issue 3 June 2001
termination. The output from the VT1.5 pointer processor is sent to the STS-1/
VT1.5 router. The router cross-connects the appropriate VT1.5 tributaries and
sends each of the three STS-1 signals to the appropriate main or function unit
slots.
Control Circuitry 7
The 22F-type OLIU circuit packs interface with the BBG8/BBG8B SYSCTL and
with the OHCTL circuit packs.
The 22F-type OLIUs 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 22F-type OLIUs respond to control signals from the SYSCTL, such as STS-1
routing, VT1.5 routing, protection switching, and LED control commands.
The 22F-type OLIUs access the SONET transport overhead and routes it via the
transport overhead channel interface to the OHCTL.
The 22F-type OLIUs access the STS-1 path overhead and routes it via the intra-
shelf control bus to the SYSCTL circuit pack.
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