GLs new USB based T1 E1 Analyzer is the world's most powerful, full featured, and complete BERT, voiceband, data, signaling, and protocol analyzer on the market. It can perform analysis and emulation of various signal types including voice, digits, and tones; various protocols including HDLC, ISDN, SS7, CAS, Frame Relay, GSM, GPRS, CDMA, and UMTS.