The BPS-AES is a deluxe audio crosspoint module designed for the BPS2020 digital bypass switcher. This module includes the following LED indicators to aid in the evaluating the board and signal conditions:

~ LOOP LCK – Related to the phase lock loop clock system that is implemented on this board. This indicator will appear when the module synchronizes to the reference that is presented.
~ REF OK – When lit, this indicates that a suitable reference is applied to the chassis, and the module has synchronized correctly.
This then sends a signal to the input cards indicating synchronization, and that they should accept the reference that is being fed to them as the master clock. (Note: There is a fall back mode in the router if the reference is lost. The system reverts from synchronous operation to asynchronous operation. The router must remain active and continues to pass signals.)
~ S-DET1/2, 3/4 – Indicates signal presence to CH1-2, 3/4.
~ E-DET1/2,l 3/4 – Indicates the input signal to CH1-2, 3/4 is synchronized to the reference (DARS).
~ PWR OK – All onboard power supplies are functional (illuminates green).
~ Power Error indications (+5V, 1.2V-2.5V, -5V, 3.3V) – These will illuminate to indicate a problem with a specified power supply.
(Note: The illumination of these LEDs will turn off the board power LED.)

• Several test-points are available for board testing purposes. Any field evaluation of these should be done very carefully to avoid damaging the boards.
~ Power test-points (+5V, 2.5V, 1.2V, -5V, 3.3V, GND)
~ VCO – Voltage Controlled Oscillator input level.
~ TAKE – Pulsed high at the time of the input switch.