SDE-4AV-QAM accepts up to four standard-definition SD input programs in NTSC baseband audio/video format. Each input program is digitized, MPEG-2 encoded, and then multiplexed into one Multi-Program Transport Stream (MPTS). An optional high definition software upgrade allows the encoder to switch modes between SD and HD. It is also equipped with an Emergency Alert System (EAS) interface. A front-panel RF test point allows for monitoring/testing of the QAM output without service interruption. Comprehensive remote monitoring and control is accomplished using any standard web browser via a rear-panel 10/100Base-T ethernet connection.