ZyXEL Elite 2864 User Guide - Page 181

(2) does not expect to receive digitized data from the DTE, perform conversion, or transmit the analog signal to the remote station or to one or more local devices. The ZyXEL 2864 series modems provide three ways to leave the Voice Receival State: (1) A shielded code is received from the DTE. (2) Characters other than , or a shielded code is received from the DTE. (3) A DTE/DCE inactivity timer time-out occurs. Items (1) and (2) are the DTE-initiated means of terminating the Voice Receival State, and item (3) is a DCE-initiated means of terminating the Voice Receival State. After termination of the Voice Data State, the DCE shall enter the Voice Command State. Events and Actions with Shielded Code Event Detection and Reporting The voice mode may return many more event detection reports than the familiar RING result code used in data/fax modems. While in voice mode, the DCE can detect DTMF, detect tone and cadence events associated with call progress activities, and monitor Telco line-related activities. The DCE will report the event to the DTE at the time of detection by inserting a shielded code into the data to the DTE. The form of the report is , whereby can be one of the possible character values listed in the following table: Event Report Description (0x10) Two contiguous codes indicate a single in the data stream. (0x1A) in the data stream. (0x12) Concatenates receival data streams. The DCE sends this code to indicate the start of a new voice data stream with the same parameters as the last stream for the purpose of a timing mark. The DCE resets its compressors before transmitting the data after the codes. This resync generation timer is defined by the command AT+VSY. (0x3) Ends Data State. The DCE sends this code to indicate the end of the voice data. R (0x52) Ring: The shielded version of the RING result code. 16-5