This presentation gives brief review of original A-VSB proposal and how this has been built upon and extended to meet the service requirements ATSC M/H services. A-VSB is a technology proposal from Samsung and Rohde and Schwarz to bring extensibility to the 8-VSB physical layer. It was approved by ATSC BOD for review by ATSC RF Specialist group S9 in Dec. 2005. A-VSB provides tools to enable ATSC reception in dynamic multipath environments. It also provides robust streams with Turbo Coding to allow low SNR reception. A-VSB also includes a tool to achieve an ATSC Single Frequency Network (SFN). There has been rigorous lab and field testing performed under the guidance of ATSC. The results of this testing was encouraging enough to lead others to believe there may be a true potential for future ATSC Mobile and Handheld M/H services. The ATSC has hence released a RFP for potential technologies to enable an ATSC Mobile/ Handheld Standard. The initial A-VSB proposal from Samsung / R and S has been extended to meet the full requirements of ATSC M/H and was submitted in response to the ATSC M/H RFP.