Tunable QSFP Optics

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.

Parameter

100GBASE-ER4

Optical interface

Single-mode

Standard

IEEE 802.3ba-2010

Maximum distance

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
Cc: NANOG
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.

Luke,
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.
--

--
Hunter Fuller
Network Engineer
VBH Annex B-5
+1 256 824 5331<tel:(256)%20824-5331>

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Luke Guillory
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