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Steffen, Thanks for the response. I’m still wondering what the cabling structure looks like for the connectors within the cable run. I was thinking 10 connectors in 1000m as being the same as a connector every 100m.
I thin you are saying that it’s more like a connector every 80-85m. What are the design rules behind this?
FYI – I appended the earlier part of the mail thread to this message. Regards _________________________________________________________ Distinguished Engineer 170 West Tasman Dr. Enterprise Networks San Jose, CA, 95134, USA. Wrk: +1 408 525 6952 Mob: +1 408 315 8024 Email: petejone at cisco.com Web:
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_________________________________________________________ From: Steffen Graber <steffen@xxxxxxxxxxxxx> Hi Peter, when originally discussing the link segment for 10BASE-T1L at least I did not think about surge protection devices at this point in time. For Ethernet-APL this topic came up, when later writing the Ethernet-APL Port Profile Specification,
but at that point the number of inline connectors was already fixed for 10BASE-T1L. For the 200 m Ethernet-APL spur, we were able to go up to 4 (2 + 2) inline connectors, as this was within the bounds of the 10BASE-T1L 1.0 Vpp operating mode link segment definition,
but unfortunately not for the Ethernet-APL trunk. Therefore I would recommend taking these two additional auxiliary devices/connectors into account, as otherwise we could use up pretty fast the maximum possible connector amount (having 8 remaining for 1000 m is less critical than just
having 3 remaining for 500 m). From my knowledge, the market is requiring surge protection for many reasons, but for me personally it is hard to tell, how many applications will use surge protection or not (this typically depends on many factors, like if it’s a chemical
plant within a building or “open frame” without surrounding building, what environmental conditions and what legal aspects and safety measures have to be taken into account and so on).
So hopefully we also could get some more information until the next meeting.
Regards, Steffen ---------------------- From: Peter Jones (petejone)
00000b5d1d72f221-dmarc-request@xxxxxxxxxxxxxxxxx Steffen, Thanks for this. a couple of things spring to mind:
Regards _________________________________________________________ Peter Jones Cisco Systems
Distinguished Engineer 170 West Tasman Dr. Enterprise Networks San Jose, CA, 95134, USA. Wrk: +1 408 525 6952 Mob: +1 408 315 8024 Email: petejone at cisco.com Web:
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_________________________________________________________ From: Steffen Graber <steffen@xxxxxxxxxxxxx>
Dear all, during our last meeting we discussed in the SPE enhancements study group the question about how many in-line connectors will be needed for a maximum length link segment.
While I agree that one in-line connector per 100 m link segment length is a good choice, I recommend to increase the overall number of allowed in-line connectors per link segment by an additional two connectors, allowing to substitute these
two in-line connectors by Ethernet-APL auxiliary devices. In Ethernet-APL up to two auxiliary devices (typically surge protectors) can be added, while reducing the number of allowed in-line connectors by one per auxiliary device.
This is very similar to adding a PoE midspan PSE, which can be installed instead of one of the connection pairs in the floor distributor, as described in clause 33.4.9. Allowing for two additional in-line connectors in this context would
also allow to use (potentially future defined) PoDL midspan devices being able to “upgrade” unpowered SPE switches by adding an external power coupling/decoupling circuit.
Just allowing e.g. 5 in-line connectors for a 500 m link segment, this would result in just having 3 remaining in-line connectors in applications, which use surge protection or future midspan PoDL devices, which would be 1 connector per
167 m only and thus require pretty long cable runs between two in-line connectors. Going for up to 7 in-line connectors (5 + 2) for a 500 m link segment would bring us back to the 1 in-line connector per 100 m range.
Best regards, Steffen Graber To unsubscribe from the STDS-802-3-SPEP2P list, click the following link:
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