The majority of existing wireless backhaul is… Wireless. The majority of new installs are… Wireless. Ethernet is still only 15% of new installs.
I’m not super-keen on Ethernet over PDH. What is funny about the whole situation is many of the vendors who sell Ethernet over PDH solutions also sell the inverse – PDH over Ethernet (circuit emulation). Both technologies are breathtaking tour de force achievements. I don’t think either will ever be a runaway commercial success, though circuit emulation should have a good run as wireless backhaul transitions to Ethernet.
Maybe wireless backhaul is the big market for WiMAX?