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.