The ADTRAN TRACER 4102 and 4202 wireless systems provide two independent T1 circuits over a wireless link for up to 30 miles (line-of-sight path required). As authorized under Part 15.247 of the FCC Rules, the TRACER 4102 and 4202 operate license-free in the 2.4 GHz and 5.8 GHz Industrial, Scientific, and Medical (ISM) bands, respectively. These bands require no frequency coordination or licensing of end users.For configuration and testing, the TRACER 4102/4202 provides the capability to control the remote system through a separate maintenance channel. The TRACER 4102/4202 has several built-in test capabilities including remote loopback. Complete configuration and performance data is available through menus accessed using a standard RS-232 terminal interface.