nanog mailing list archives
Re: PCIe adapters supporting long distance 10GB fiber?
From: Denys Fedoryshchenko <denys () visp net lb>
Date: Tue, 20 Jun 2017 23:24:37 +0300
On 2017-06-20 22:07, Baldur Norddahl wrote:
SFP needs 3.3V, it might be supplied from regulator on the card or directly PCI-Express, can't be absolutely sure, in reference design it is just 3.3V_NIA and then filter, also reference design SFP power circuit define max 750mA/3.3V max to SFP, thats only 2.475W.I would expect anything mounted in a computer to have all the power youcould want. It is not like the ATX power supply cares about an extra wattor two. As I understand the issue it is more about cooling than power and isprimarly a concern in high density switches were you could have 48 or moreto power and cool.
FTLX1471D3BCV (10km SM) - up to 285mAFTLX1671D3BCL (40km SM) - up to 400mA, and thumb rule in electronics it is better to not exceed 50% of max specs of designed max current, as for many parts it is stated for 25C & etc operating conditions.
I expect it might work, but noone knows how long, and how reliable, if it is not cooled very well. And 82599 sensitive to cooling(it is very old card after all), as soon as it is not enough, it starts to glitch.
Den 20. jun. 2017 18.09 skrev "Denys Fedoryshchenko" <denys () visp net lb>:I guess it depends on NIC, there is many spinoffs of Intel X520 with muchweaker power supply circuitry.It might work with good NIC, but you can't rely on it on long term, IMHO.Even 40km Finisar SFP+ has Pdiss 1.5W. Also they mention: "The typical power consumption of the FTLX1672D3BTL may exceed the limit of 1.5W specified for the Power Level II transceivers" If we talk about 80km, Pdiss is 1.8W. While 10GBASE-LR is <1W On 2017-06-20 16:30, Max Tulyev wrote:We use Intel NICs with SFP+ holes. It works good with long and short range SFP+ modules, including CWDM/DWDM. On 15.06.17 12:10, chiel wrote:Hello,We are deploying more and more server based routers (based on BSD). We have now come to the point where we need to have 10GB uplinks one these devices and I prefer to plug in a long range 10GB fiber straight into the server without it going first into a router/switch from vendor x. Itseems to me that all the 10GB PCIe cards only support either copper10GBASE-T, short range 10GBASE-SR or the 10 Km 10GBASE-LR (but only very few). Are there any PCIe cards that support 10GBASE-ER and 10GBASE-ZR? Ican't seem to find any. Chiel
Current thread:
- Re: Vendors spamming NANOG attendees, (continued)
- Re: Vendors spamming NANOG attendees John Levine (Jun 14)
- Re: Vendors spamming NANOG attendees Brett Frankenberger (Jun 14)
- PCIe adapters supporting long distance 10GB fiber? chiel (Jun 19)
- Re: PCIe adapters supporting long distance 10GB fiber? Karsten Elfenbein (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Mikael Abrahamsson (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Alain Hebert (Jun 21)
- RE: PCIe adapters supporting long distance 10GB fiber? Aaron Gould (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Max Tulyev (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Denys Fedoryshchenko (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Baldur Norddahl (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Denys Fedoryshchenko (Jun 20)
- Message not available
- Message not available
- Message not available
- Message not available
- Message not available
- Message not available
- Message not available
- Message not available
- Re: PCIe adapters supporting long distance 10GB fiber? Baldur Norddahl (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Denys Fedoryshchenko (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Mikael Abrahamsson (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Baldur Norddahl (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Jim Shankland (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Jörg Kost (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Chris Adams (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Hunter Fuller (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? Denys Fedoryshchenko (Jun 20)
- Re: PCIe adapters supporting long distance 10GB fiber? James Bensley (Jun 21)