Operations Manual

06 Oct 2022
This document contains proprietary and confidential information originated or owned by Cubic. Neither this document nor the
information disclosed herein shall be reproduced or transferred to other documents or used or disclosed to others for
manufacturing or any other purposes except as specifically authorized in writing by Cubic.
8800-45001.A
2-4
2.1.3 Power Management
The Power Management Unit (PMU) is a logical component that performs all power monitoring, conditioning
and control within the validator. The validator further filters and fuses the onboard power and provides a surge
protection circuit in case of unwanted spikes in voltage.
Validator power is derived from the onboard power system of the bus battery. Voltage can range from 8 to 36
Volts, direct current (VDC) nominally, while during some ignition or cold start events there may be transients
of up to 60V. The validator is designed to run in the above range as well as handle any voltage spikes that
may occur.
2.1.3.1 Battery
The Validator contains 2 super-capacitors which provide sufficient hold-up to allow for a safe shutdown during
unexpected power loss.
A lithium coin cell is used within the validator for Real Time Clock (RTC) power.
The persistent data (e.g., audit registers) is saved to the flash, which theoretically has unlimited storage
duration when powered down. The keys and RTC are backed up by the lithium coin cell battery.
The validator monitors the coin cell battery voltage. If the voltage falls under a warning threshold, a coin cell
battery low event is generated to indicate that the coin cell battery needs to be replaced.
2.1.3.2 Power Loss
To protect the validator against corruption during a period of power loss, the validator includes
supercapacitors that hold power for 5 seconds. A microcontroller monitors external power to ensure the
device is aware of the power failure and able to power down safely. After a main power loss, the validator
powers down under 5 seconds.
2.1.4 Software Design
The validator application software implements the following tasks:
• Business rules
• Back Office connectivity
• User interface
• Configuration
The validator calculates the required fare, deducts the correct fare from the stored value or stored rides on the
card, and re-encodes the remaining value or number of rides to the card. If a transit pass is on the card, the
Validator validates the transit pass and re-encodes the usage information on the card.
Transactions are stored in the unit and transmitted to the Back Office. The customer is immediately notified of
fare status via the display and audible alerts.
The validators receive date/time synchronization on a regular basis from the Back Office to which it
communicated with in real time via Ethernet or Wi-Fi. The validator also receives the appropriate software
configuration from the Back Office.
2.1.4.1 Transaction Records and Storage
The validator generates and stores transaction records for each transaction performed and can store at least
30 days of payment transactions and risk mitigation lists. In the event of communications failure, transaction
data is held in non-volatile flash until communications are restored and the data is uploaded to the Back