nanog mailing list archives
Re: 40G and 100G optics options
From: joel jaeggli <joelja () bogus com>
Date: Mon, 18 Dec 2017 09:40:30 -0800
On 12/18/17 09:01, Baldur Norddahl wrote:
Hi What options are available for 40G QSFP+ and 100G QSFP28 for 10+ km links? I see a lot of switches offered with QSFP+ and QSFP28. But I do not seem to find the necessary optics to build the links I want. For example, take a look at the options available at Fiberstore: https://www.fs.com/c/generic-40g-qsfp-891 Generic Compatible 40GBASE-LR4 and OTU3 QSFP+ 1310nm 10km LC Transceiver for SMF $340 Generic Compatible 40GBASE-ER4 and OTU3 QSFP+ 1310nm 40km LC Transceiver for SMF $1500 https://www.fs.com/c/generic-qsfp28-100g-transceivers-2858 Generic Compatible QSFP28 100GBASE-LR4 1310nm 10km Transceiver $1999 Generic Compatible QSFP28 100GBASE-ER4 1310nm 40km Transceiver $7000 That is it. Four modules and the 40km are prohibitive expensive. The situation at other vendors appears to be similar. I need stronger modules that can do more than 10 km without being extremely expensive. Or DWDM modules in the 1550 nm band so I can use external amplifiers. Am I looking in the wrong place? Is this expected to be available in the near future?
qsfp28 is heavily constrained by power budget. The inability to put a serdes in the package does also very much constrain the form factor since it's 4x25 wavelengths. cfp2-aco is the approach that stops paying for the DSP with every optic (DCO does that) gets you long haul single wave, DWDM and tunables, but it's a bit of an incovenient form-factor for fixed configuration 1ru switches.
Regards, Baldur
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Current thread:
- 40G and 100G optics options Baldur Norddahl (Dec 18)
- Re: 40G and 100G optics options Tim Pozar (Dec 18)
- Re: 40G and 100G optics options joel jaeggli (Dec 18)
- Re: 40G and 100G optics options Fredrik Korsbäck (Dec 18)
- Re: 40G and 100G optics options Sabri Berisha (Dec 19)
- Re: 40G and 100G optics options Fredrik Korsbäck (Dec 19)
- Re: 40G and 100G optics options joel jaeggli (Dec 19)
- Re: 40G and 100G optics options Sabri Berisha (Dec 19)
- Re: 40G and 100G optics options Brandon Butterworth (Dec 18)