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
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.
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 |