The AX-C709 is part of the Axiomet range of digital, loop-back testers. This device is designed to provide a versatile solution for a variety of applications including VDSL, ADSL, and xDSL testing. It features multiple ports and a simple yet powerful user interface. It also provides a variety of testing functions including Bit Error Rate Testing (BERT) for measuring transmission quality, as well as TDR (time-domain reflectometry) for testing cable impedance. It also has the capability to provide automated testing and diagnostics of the ports and networks in addition to the manual tests. The AX-C709 is easy to install and configure, making it a great choice for a reliable and comprehensive digital testing solution.