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Power Over CoaXPress

CoaXPress camera powering through the CoaXPress Link connections

Each connection of the CoaXPress Host connector is capable of delivering power to the camera through the CoaXPress cable.

The Power Transmitting Unit – PTU – is responsible for a safe delivery of power. Therefore, it fulfils all the requirements of the CoaXPress standard for a CoaXPress Host, namely:

  • It is capable of delivering up to 17 W of 24 V DC power to the connector
  • It implements an over-current protection device – OCP
  • It supports the CoaXPress PoCXP detection method

In addition, it provides the application with the capability of:

  • Controlling the PoCXP automatic detection
  • Disabling or interrupting the power delivery
  • Resetting the OCP when tripped

PoCXP Functional Block Diagram

Power Source

All the PTU's of a Coaxlink card are powered by an external 12 V power supply through a 12 V to 24 V power converter on the Coaxlink card. The external 12 V supply is attached to the auxiliary power input connector through a 6-pin PEG cable.

The AuxiliaryPowerInput feature reports the status of the connection made by the PEG cable between the external power supply and the Coaxlink auxiliary power input connector.

The CxpPoCxpPowerInputStatus feature reports the status of the 24 V power converter.

Note: The 12 V supply is typically delivered by the power supply of the Host PC.

IMPORTANT NOTE

For users of early versions of the Coaxlink Driver

Since version 3.1 of the Coaxlink Driver, PoCXP powering is enabled at system power-up.

Consequently, when using PoCXP powered camera(s), the application is not anymore required to enable PoCXP powering by issuing a CxpPoCxpAuto command.