10Gb-10Gb cross-device compatibility questions (PHY-connectors)...

Hi, all, in general, I'm a little surprised at all the PHYsical layer standards running 10Gb Ethernet. This seems to have hindered adoption rate substantially. I have been recently getting questions like can I connect this server chassis to this switch device. or can I connect future-proof the switch deployment now so that it will handle 10Gb firewalls when we buy those. And we have some older 6509e chassis with SUP-720, which don't seem to be able to support SFP+ linecards easily. this is pretty confusing, so just wondering if someone has found a document covering all the PHY-layer interoperability gotcha's.
I found this link, which shows the different 10Gb cards/modules for the switches:
http://www.cisco.com/c/en/us/td/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6974.html
And this link, which explains the different L2 connector types
http://en.wikipedia.org/wiki/10-gigabit_Ethernet
Questions:
1. What is required for 6509e with VS-SUP720-10G to support SFP+ 10Gb connectors? looks like I need a WS-X6708-10G-3C with a special convertor: CVR-X2-SFP10G? will this WS-X6708-10G-3C run with VS-SUP720-10G?
2. In general, can I always adapt a XenPak/X2 connector to a SFP+ connector somehow with a special dual-end cable?
3. Are there any connector types that will not be compatible with each other? Such as Xenpack wont connect to X2. I could read the matrix, but wondering if anyone ran across any that stick out for them?
4. If I have a cable such as this SFP-H10GB-CU5M= (SFP+ twinax), will that work to connect up a typical server such as HP proliant with an SFP+ NIC, in almost all cases? one reason I ask is that I see the server guys bringing in their SFP+ Direct Copper cables with premade SFP+ ends, and wondering if those will be fine in most cases connecting up to cisco switch side. Or vice versa, if I use the pre-made cisco cable, will it connect to a server NIC? historically, different vendors didn't play nice with regard to these SFP standards. Does this relegate me to pretty much buying cisco SFP+ connectors in some version of fiber, and connect them to the HP-branded SFP+ fiber connectors?
5. what are the future adoption plans for 10GBASE-T (8P8C). It seems like cisco makes a connector (X2-10GB-T), which looks promising. Is anyone using those? Does anyone think that will become the predominate standard in time, like it has for 1GB connections?

X2-10GB-T is end of life soon.
There is a SFP+ version like

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"Haben, Dirk" <[email protected]> on 08/25/99 02:09:16 AM
To: "'Soapbox Forte Users'" <[email protected]>
cc: (bcc: Dwayne Kryger/SEH)
Subject: (forte-users) C++ version compatibility question. Forte v30L2 on
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For the archives, go to: http://lists.sageit.com/forte-users and use
the login: forte and the password: archive. To unsubscribe, send in a new
email the word: 'Unsubscribe' to: [email protected]

Dirk:
I ran into a similar problem. I added an other flag to my fcompile script and
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"Haben, Dirk" <[email protected]> on 08/25/99 02:09:16 AM
To: "'Soapbox Forte Users'" <[email protected]>
cc: (bcc: Dwayne Kryger/SEH)
Subject: (forte-users) C++ version compatibility question. Forte v30L2 on
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For the archives, go to: http://lists.sageit.com/forte-users and use
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email the word: 'Unsubscribe' to: [email protected]

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Thanks for your time and knowledge. I am trying to understand how bypass mode works in terms of cross connection.
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