Simultaneous and independent testing of T-carrier and SONET provide by using separate protocol processors for DS1/E1, DS3, and SONET STS-1, OC-1, OC-3c, and OC-12c. An easy to use, intuitive touch-sensitive GUI and test-scripting capabilities allow technicians of any experience level to effectively operate the ASA312. Tests todays most common Optical Tributary Speeds. DS3 and DS1/E1 drop and insert from SONET. Alarm/error generation and analysis. 9.5%22 active matrix color display with touch screen. PCMCIA interface for modem and memory storage. Built-in optical/electrical power, and frequency measurement. Remote access via RS-232 or dial-up modem.