Circuit Pack Descriptions
Issue 8.0 July 2002
7-15
Parallel Telemetry Interfaces 7
The SYSMEM circuit pack supplies the following alarms from the FT-2000 OC-48
Add/Drop-Rings Terminal as remote information accessible to an operations
system:
■ Local CR, MJ, and MN alarms
■ Remote CR, MJ, and MN alarms
The FT-2000 OC-48 Repeater Bay does not support a parallel telemetry interface.
For more information about the parallel telemetry interface, refer to Volume I,
Section 6, “Operations Interfaces.”
User-Settable Miscellaneous Discrete Interface 7
The SYSMEM circuit pack accepts 16 user-settable environmental inputs and
provides 4 user-settable control outputs at the FT-2000 OC-48 Add/Drop-Rings
Terminal. At the FT-2000 OC-48 Repeater Bay, the SYSMEM circuit pack accepts
16 environmental inputs only. The four control outputs will be available in a future
release. For more information about the miscellaneous discrete interface, refer to
Volume I, Section 6, "Operations Interfaces."
Power Circuitry 7
The SYSMEM circuit pack receives two sources of −48 volts that are diode OR'd,
fused, and filtered. Two modular DC-to-DC power converters produce +5 volts
and +12 volts used on the circuit pack. The +5 volt power converter provides a +5
volt source for the FAULT LED on the System Controller (SYSCTL) circuit pack if
a power failure occurs on the SYSCTL circuit pack. The +12 volt power converter
is used to program the flash memory.
The SYSMEM circuit pack monitors the two −48 volt sources to the circuit pack. If
the SYSMEM circuit pack detects a failure of the onboard fuse or power converter,
the red FAULT LED will light. If the fuse or +5 volt power converter fails, the
SYSCTL circuit pack provides +5 volts to light the FAULT LED on the SYSMEM
circuit pack.
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