Data rate Sirius XHS/HS, maximum cable lengths USB and sync

Dear,

I have a measurement coming up where I will need to bridge a 25m distance between two Sirius XHS devices. I will be using an acquisition rate of 200kHz and all 2x8 channels will be in use. Can you comment on the expected data rate the USB cables will have to handle in such case? I know about fiber-optic USB cables, but so far we have managed to do similar setups up to 15m with USB extension cords with built in amplifier.

Is there also a maximum cable length for syncing the two devices? I will be using an ethernet cable in the GLAN port using PTP, or an ethernet cable connected to the sync ports using two adapters, such that I can sync with IRIG BDC. .NET is not an option.

Thanks in advance

Dear Jelle,

thank you for reaching out to us.

We understand that you would like to connect two SIRIUS-XHS devices, that are 25 m apart, to a PC via a USB cable. Both devices will be set to the sample rate of 200 kHz, and all channels will be in use.

For the USB protocol, the bandwidth should be around 3.2MBps for each SIRIUS-XHS device, which is below the bandwidth limitations. You haven't specified the distance from the devices and the PC, so we assume that this distance is 25 m as well. In this case, we would recommend the use of our USB-EXTENDER (100 m or 30 m), since we have tested that measurements work if these cables are used.

For IRIG B-DC synchronization between the two devices, a Sync cable has to be used. As per our specifications, the cable can be at maximum 200 m long for IRIG synchronization.

In the case of a PTPv2 synchronization, the RJ45 cable between the two devices is limited by the general Ethernet standards to 100m.

If your system requirements allow it, we would recommend foregoing the USB connection and connecting the system via EtherNET. The devices would be connected to the PC via an Ethernet switch, such as, for instance, DS-6xLAN-RJ45.

Please do let us know if you have any additional questions.

Best regards,

Pika