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Circuit Pack Descriptions
Issue 1 December 1997 7-49
Maintenance Features and Modes 7
The BCP3 circuit pack communicates with the SYSCTL circuit pack via a control
interface.
Transmit Direction. 7The BCP3 receives 12 sets of STS-1 data signals, one each
from the active and standby function unit circuit packs. One set is selected by
SYSCTL request.
Receive Direction. 7The BCP3 receives two sets of 12 STS-1 data signals, one
each from the active and standby main-b circuit packs. One set is selected by
SYSCTL provisioning.
Performance Monitoring. 7The BCP3 circuit pack monitors the STS path bit
interleaved parity (BIP-8) on all selected inputs from the main-b and function unit
circuit packs.
Other Functions: 7■Circuit pack insertion and removal detection
■ FAULT LED (red) control (via control interface)
■ ACTIVE LED (green) control (via control interface)
■ +5 volt power module failure
■ Circuit pack version and type recognition (EEPROM via control interface).
Power Circuitry 7
The BCP3 receives −48 volts which are diode ORed, fused, and filtered prior to
conversion to the +5 volt source for the circuit pack. A failure of the fuse or
converter causes the red FAULT LED to light.
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