Narrowband PON network topology and the same ATM-PON, which has the following major differences between ATM-PON:
◆ ATM-PON broadband access technology, can provide users with more than 2Mb/s access rate; narrowband access technology only supports narrowband service, to provide users with access speed of up to 2Mb/s.

The most important feature of ATM-PON, is its passive multipoint type network structure. It combines the ATM technology and passive optical network technology to provide a variety of services from existing narrowband to broadband. ATM-PON by the OLT, ONU / ONT and passive optical splitter components.

APON the mid-1990s developed, and was able to develop a fiber-based standard include IP data, video and Ethernet services for business and residential users, logical ATM and PON were selected as the network protocol and network platform, because ATM is seen as the only able to provide various types of communication protocols, and is the most economical broadband PON fiber solution.