This page is a life document to decide on the features of the new WR switch. It is based on the following previous inputs:
- Discussion in wr-dev mailing list (~2017, not available online any more)
- Discussion during WR Workshop at CERN (2018, available here )
- Summary of the two above available here
Front Panel
Feature | Proposal | To be discussed (TBD) or Comment |
---|---|---|
Data ports | Number: 18 Speed: 1 and/or 10 Gbps |
|
Mgmt ports | 2 Ethernet (SFP cage + simple RJ45) USB Mini-B |
|
CLK IOs | Type: SMA IN_1: 10 MHz IN_2: 1 PPS IN_3: AUX OUT_1: 10 MHz OUT_2: 1 PPS OUT_3: 62.5 MHz OUT_4: AUX (abscal) |
Check how SMA and AUX IN/OUTSMA can fit IN_3 AUX could be used in the future for internal TIC... |
Port LEDs | LED_1: Link / WR mode / Calib LED_2: Synced / Activity |
|
Status display | Small/standard OLED | Replaces status LEDs |
NOTE: There is no support for port speeds higher than 10 Gbps (coherent, 25Gbps and 100Gbps) - there is no real requirements for such feature and it would result in substantial cost.
NOTE: The chosen FPGA allows for 20 ports, yet we consider 18 sufficient, usually people ask for less.
Back panel
Feature | Proposal | To be discussed (TBD) or Comment |
---|---|---|
Power | Power switch Power plug |
It is easier and more practical from design view-point, as well as saver to have it in the back |
Debugging | USB Mini-B FPGA USB Mini-B CPU |
NOTE: There is no RS232 port in the back (as compared to the previous version of the WR Switch) - it was not really used
Power Supply
- The basic version of the switch should have single power supply (not redundant, not swappable) and be prepared for redundant/swappable supply, two possibilities to explore
- Standard socket for redundant/swappable power supply already in place in the basic switch version (e.g. with Zippy M1U2-5650V4H )
- Standard connector (power/diagnostics) to allows WR switch versions with redundant/swappable power supply and empty space in the WR switch enclosure
- Enough current for DWDM
FANs and airflow
- Make a fan-less switch with FANs, i.e. include means that improved heat dissipation from the Fan-less WR switch while installing FANs
- Provide swappable fans in the basic version of the WR switch (custom mechanics using standard fans to minimize costs)
- Good quality with speed measurement supported by HWm, Fan control in PCB
- Airflow
- Initial idea: blow out air to the back (circulation from front to back) -further study needed
- Add air holes in the front, not to depend on the SFP cages
NOTE1: There is no swappable FANs in basic switch version - it would be too expensive, increase price at 60 euro per module
NOTE2: Fanless version has been discarded, it is not sufficient for DWDM
FPGA
- Zynq Ultrascale+
- Most likely ZU11