A cost-effective DSL Protocol Analyzer for use in the development and testing of ADSL and SHDSL equipment. DSLscope provides powerful protocol analysis capabilities to engineers and technicians by capturing, decoding and displaying the detailed contents of the DSL ATM AAL5/AAL2 packets passed across an DSL line. DSLscope is the first DSL protocol analyzer to provide the user with visibility of nested packet headers directly on the DSL line.