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CoaXPress Host Interface

Electrical specification of the CoaXPress Host interface

Each connection of the CoaXPress Host interface implements a Host Transceiver (HT) and a Power Transmitting Unit (PTU).

CXP-3 Host Transceiver

Applies to:

The Host transceiver implements a high-speed cable receiver and a low-speed cable driver for CXP-3 speeds.

It fulfills the electrical specification of the CoaXPress 1.1 standard. Namely:

  • The cable receiver requirements for the high-speed connection described in Table 2 of the Annex B of the CoaXPress Standard 1.1
  • The cable driver requirements for the low-speed connection described in Table 3 of the Annex B of the CoaXPress Standard 1.1

Host Transceiver Specification
Parameter Conditions Min. Typ. Max. Unit
High-speed connection bit rate   1.25   3.125 GT/s
Low-speed connection bit rate     20.833   MT/s
Max. cable length BELDEN 1694 @ 1.25 GT/s 130     m
BELDEN 1694 @ 2.5 GT/s 110     m
BELDEN 1694 @ 3.125 GT/s 100     m

Power Transmitting Unit

The Power Transmitting Unit implements Power over CoaXPress (PoCXP) as specified in section 7 of the CoaXPress Standard 1.1.

If fulfills all the requirements for a Host; namely:

  • Over-current protection (OCP)
  • PoCXP CoaXPress Device detection

In addition: it provides the user with an AUTO/OFF control:

  • Setting the control to AUTO initiates a new PoCXP device detection; the power will be applied only if the detection succeeds
  • Setting the control to OFF forces the PTU to disconnect. The control is OFF after power on, and, if providing power to the camera is required, has to be set to AUTO by the application.

Power Transmitting Unit Specification
Parameter Min. Typ. Max. Unit
DC output voltage 22 24 26 V
Available output power 17     W
OCP holding current 790     mA
OCP nominal trip current     5 A
PoCXP Device detection sensing current 550   1,000 µA
Note: The above specification applies over the whole operating temperature range of the Coaxlink card.