RA – Rate Adaptation
The Rate Adaptation process takes place when a slow device is connected to an ISDN (Integrated Services Digital Network). Rate Adaptation is required when the equipment at one end is a TA (Terminal Adapter) connected to a synchronous or asynchronous device running at a speed lower than 64Kbps. The two main ITU-T (International Telecommunications Union-Telecommunication Standardization Sector) Rate Adaptation standards are V.110 and V.120.
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