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The DDS QUICK TESTER is a 0-64 kilobit DDS (digital data service) quick continuity tester. It provides for an overall test of all wiring on the DDS circuit from the telephone company's channel bank to the RJ48S jack where the CSU / DSU is attached. This allows for a rapid test of the complete loop from the OCU to the demarcation point at the customer's site... Callnet Systems is a Hardware & Software Development Company that supports the former Calnet Designs prducts. Other Security and specialized Telecom & Data Devices for the Telephone and Data Industry have also been developed. Our Remote Access and RTU product has been deployed world wide. For more information on the most widely used security and RTU products used by Telephone Companies, go to CallnetSystems.com. CallnetSystems.com is the property of Callnet Systems... Check your 56k DDS data circuit right up to the CSU / DSU RJ48S jack. OCU to CSU continuity can now be rapidly tested even by the local customer.