A modem for providing both DSL and analog signal connection capability
with a single RJ-11 jack via an automatic switching mechanism. The
switching mechanism is controlled by software, which is responsive to
user connection preference (i.e., for DSL or analog connection) and/or
the detection that a DSL service is available. Dependent on whether DSL
is detected on the signal line coupled to the jack and/or whether the
user selects a DSL connection, the switching mechanism routes the signal
received on the RJ-11 jack through either a path having the DSL modem
circuitry or a path having analog modem circuitry.