Arun Welch wrote:

Yup. There's work in progress to put IP directly on SONET, which should save
people with OC-3c backbones from paying the ATM penalty.

Cook: would you please give a pointer to whom they are and what one reads
or looks at to get up to speed? (ie IP over sonet)

RFC-1619, 'PPP over SONET/SDH'.

- paul