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Fiber Transceivers and 802.1q

Posted on 2010-03-28
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By default, do multimode fiber transceivers pass tagged packets (802.1q)?

I see some transceivers listed as 802.1q transparent, and others as stating not at all.

I have run into Pheonix Contact transceivers, where dependent on the serial number, either could or could not pass 80.21q traffic.

I need to upgrade some Allied Telesyn transceivers because they are finicky about speed and duplex, and refuse to work with Cisco Catalyst trunk and access ports. I finally got them working with an gigabit HP ProCurve (but only on one node, where the other node needed to explicitly be a 10/100 switch so as to set the auto-negotiation to 100).

I will be upgrading to a gigabit transceiver, but need to be sure it supports 802.1q; I'm looking at http://www.startech.com/item-specs/ET91000SC-Gigabit-1000Mbps-RJ45-to-Multimode-SC-Fiber-Media-Converter.aspx right now.

If anyone has recommendations, I need the transceiver to be gigabit and utilize sc connectors for multimode fiber.
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Question by:Tercestisi
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by:mredfelix
ID: 28906310
Never come across a switching prtocol to be effected the media conversion. However we use these and we just change the jumpers for specfic systems.

http://www.lanode.com/media_converters/frm301spec.htm
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by:NetFixr-Dani
NetFixr-Dani earned 2000 total points
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Hrm, the only thing I can think of is whether the media converter has a hard time passing through frames that are larger than 1514 Bytes?  Remember a 802.1q frame will be 1518Bytes (with full 1500Byte MTU packet).

If all you need is a single media converter,I have had good experience with these: http://www.imcnetworks.com/Products/product.cfm?family=1 , one thing I like is that they take direct AC power, no need to tie up space on a power strip with an external AC adapter (which may end up falling out due to weight over time).
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Tercestisi earned 0 total points
ID: 30330518
I went with a Transition Networks transceiver and it worked well; thanks for the insights.
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