Tunable QSFP Optics
lguillory at reservetele.com
Tue Jun 19 20:16:19 UTC 2018
Seeing that it seems I’m misunderstanding things, so I went grab a meter and checked what was leaving. Both of the 100g SFPs were only outputting on 1310, while the 40g showed each of the 4 lanes.
100GBASE-LR4 QSFP28 Transceiver Module (SMF, 1310nm, 10km, LC, DOM)
Optical Components DML 1310nm
Juniper 100GBASE-ER4, Showing 1310 as the only color leaving.
SMF cable, 40 km (24.9 miles)
Transmitter wavelength per lane
1294.53 through 1296.59 nm
1299.02 through 1301.09 nm
1303.54 through 1305.63 nm
1308.09 through 1310.19 nm
40GBASE-LR4 Compatible 40GBASE-LR4 QSFP+ Transceiver Module (SMF, 1310nm, 10km, LC, DOM)
Optical Components DFB CWDM
[cid:image001.jpg at 01D407E0.78FB4970]
From: Hunter Fuller [mailto:hf0002+nanog at uah.edu]
Sent: Tuesday, June 19, 2018 2:28 PM
To: Luke Guillory
Subject: Re: Tunable QSFP Optics
On Tue, Jun 19, 2018 at 11:53 AM Luke Guillory <lguillory at reservetele.com<mailto:lguillory at reservetele.com>> wrote:
They still leave the transceiver as a single 1310, the lanes color isn't ever expose since the mux takes place within the transceiver. When I looked into this for 40g and 100g I found no way to passively do it.
Can you link a document that corroborates this? I can only find ones that show it as 4 separate lanes and 4 separate colors, visible on the actual output.
Example: https://www.nanog.org/meetings/nanog44/presentations/Monday/Hankins_100gbe_update_N44.pdf slide 11
This is also what I've observed anecdotally, but there could be other explanations, I am admittedly not an expert.
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