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* Depth - depends on the design requirements (might be more than currently switch)
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## Front Panel
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| Feature | Proposal | **To be discussed (TBD)** or Comment |
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| Feature | Proposal | **To be discussed (TB-D) / investigated (TB-I)** or Comment |
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|-----------|-------------------------|-------------------------------|
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| Data ports | Number: 18 <br /> Speed: 1 and/or 10 Gbps | |
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| Mgmt ports| 2 Ethernet (SFP cage + simple RJ45) <br /> USB Mini-B | |
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| Mgmt ports| 2 Ethernet (SFP cage + simple RJ45) <br /> USB Mini-B | **TB-I: standard/common management interfaces <br /> on Ethernet switches (USB Mini-B, RS232, others)** |
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| CLK IOs | Type: SMA <br />IN_1: 10 MHz <br />IN_2: 1 PPS <br />IN_3: AUX <br /> OUT_1: 10 MHz<br /> OUT_2: 1 PPS <br /> OUT_3: 62.5 MHz <br /> OUT_4: AUX (abscal) | Check how SMA and AUX IN/OUTSMA can fit <br /> IN_3 AUX could be used in the future for internal TIC... |
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| Port LEDs | LED_1: Link / WR mode / Calib <br /> LED_2: Synced / Activity | |
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| Status display | Small/standard OLED | Replaces status LEDs|
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| Status display | Small/standard OLED | OLED replaces status LEDs <br /> **TBI: what displays are used in Ethernet switches (LEDs, screens)**|
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| Switch/button | Power/reset | **TBI: what is the common practice in Ethernet switches** |
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*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.*
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*NOTE: The chosen FPGA allows for 20 ports, yet we consider 18 sufficient, usually people ask for less.*
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## Power Supply
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* 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
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* **To be investigated:**
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* What is typically used in Ethernet switches (standards and common practices)
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* If/what standards for redundant/swappable power supplies exist (e.g. check Intel standard CRPS)
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* **Initial idea:** 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
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* Standard socket for redundant/swappable power supply already in place in the basic switch version (e.g. with [Zippy M1U2-5650V4H](http://www.circotech.com/zippy-m1u2-5650v4h-650w-1u-redundant-power-supply-.html) )
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* Standard connector (power/diagnostics) to allows WR switch versions with redundant/swappable power supply and empty space in the WR switch enclosure
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* Enough current for DWDM
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## FANs and airflow
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* **To be investigated:**
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* What is typically used in Ethernet switches (standards and common practices)
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* If/what standards for redundant/swappable power supplies exist (e.g. check Intel standard CRPS, examples: [here](https://www.supermicro.com/support/resources/pws.php) and [here](http://www.compuware-us.com/products.php?cno1=3) )
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* If/what standards for airflow in switches/routers/rack devices exist
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* **Initial idea for FANs:**
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* Make a fan-less switch with FANs, i.e. include means that improved heat dissipation from the [Fan-less WR switch](https://www.ohwr.org/project/wrs-fl-hw/wikis/home) while installing FANs
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* Provide swappable fans in the basic version of the WR switch (custom mechanics using standard fans to minimize costs)
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* Good quality with speed measurement supported by HWm, Fan control in PCB
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* Airflow
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* **Initial idea for airflow:**
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* Initial idea: blow out air to the back (circulation from front to back) -further study needed
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* Add air holes in the front, not to depend on the SFP cages
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* FANs should be of good quality with speed measurement supported by HW, Fan control in PCB
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* Air holes in the front panel should be added, not to depend on the SFP cages
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*NOTE1: There is no swappable FANs in basic switch version - it would be too expensive, increase price at 60 euro per module*
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*NOTE2: Fanless version has been discarded, it is not sufficient for DWDM*
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