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Ethernet over SDH. It's interesting topic though, I got such question on job interview few days ago and I think I was too stressed to give the answer straight away but after I left the interview I came out with few answers about that and I used such solution few years ago in Iceland.

So, you want to carry native Ethernet over SDH but for some historical reasons you have a huge SDH/PDH network which carry mainly IP - so what you can do about it? I was thinking of Ethernet-over-IP-over SDH? why not? I tried something like that couple of years back and it works.

The Telco way is to convert the SDH to ethernet with pseudo-wire (tunnelling) and Axerra networks and Tellabs have such solutions or using the so well advertised rfc4448 (ethernet-over-mpls)
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