363-206-295
Circuit Pack Descriptions
Issue 1 December 1997 7-15
Interface Circuitry 7
The OHCTL circuit pack interfaces with the SYSCTL via the intra-shelf control
bus.
Maintenance Features and Modes 7
Failures of the OHCTL are not service affecting; therefore, there is no protection
of the pack.
Power Circuitry 7
The OHCTL receives two sources of −48 volts which are diode ORed, fused,
filtered, and converted to a +5 volts source to power the circuit pack. A failure of
the fuse or converter causes the red FAULT LED to light.
OHCTL Quick Reference Summary 7
Functions 7
Major functions of the OHCTL circuit pack are as follows:
■ SONET overhead channel interface to OLIU circuit packs
■ User-definable miscellaneous discrete environmental alarm and status
outputs for monitoring auxiliary remote site equipment used with a
DDM-2000 OC-12 shelf
■ An X.25 message-based operations interface
■ Inventory information (
CLEI
code, date of manufacture, etc.)
■ Intra-office LAN interface.
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