2m ber test set dd942f Dd942f is the latest 2m tester developed by us and is necessary instrument for the circuit operation and failure elimination and maintenance, it can realize simultaneously the functions such as monitoring of e1 online error code, testing of offline error code and monitoring of call channels, can simulate various alarms and error codes on e1 circuit, can analyze the error code indexes and alarms, and can store various detailed information of various events, moreover, it can remotely monitor the instrument via the computer. Dd942f adopts the large-screen lcd chinese display with the background light and is easy to operate; it includes the built-in chargeable lithium battery and can continuously operate for over 8 hours. Dd942f also supports rj45 network interface and complete tcp/ip protocol and can be upgraded online.