Nyquist Capital has a nice analysis of the Passave acquisition by PMC Sierra. Here’s some quotes:

-In 2005 Passave had a worldwide market share of approximately 68%.

-However, it’s a safe bet that the purchasing managers at Huawei and ZTE will want to select a supplier [Passave] that has been qualified by one of the toughest carriers - NTT - and two of the premier quality equipment suppliers in the business.

and a quote from a comment:

Any of the ONU vendors selling to the large carriers are making little to no money on the ONU. There is a huge amount of pressure to reduce costs. I hear about it constantly. This is driving the MAC vendors to get to an “ONU on a chip” solution.