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73D2348A Datasheet(PDF) 2 Page - TDK Electronics |
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73D2348A Datasheet(HTML) 2 Page - TDK Electronics |
2 / 9 page 73D2248A/2348A MNP5, V.42bis Datacom Modem Device Set 2 FUNCTIONAL DESCRIPTION The 73D2248A/2348A device set forms the basis for an international modem design incorporating the most advanced error control and compression algorithms. The set consists of two chips, the 73K224L (73K324L) modem and the 73M2910 controller. Customization of the controller is one of the features of this device set; software modules allow the modem vendor to provide a range of features from a standard hardware platform. The 73K224L (73K324L) provides the QAM, PSK and FSK modulator and demodulator functions, call progress and handshake tone monitors, test modes and a tone generator capable of producing DTMF, answer and CCITT guardtones. This single-chip modem supports the V.22bis, V.22, V.21 and Bell 103/CCITT V.23/212A operating protocols in both sync and async modes. Low level functions of the controller provide for automatic detection of DTE speed, auto-dial, auto-answer, handshake with fallback and call progress detection. The 73M2910 controller handles both the low level modem functions as well as protocol negotiation and protocol operation. Software modules can be chosen to provide the desired protocols for product customization and differentiation. In addition, the “AT” command set source code will be available for those desiring to provide unique or country dependent features. Basic capabilities of the modem are those found in the 73K224L (73K324L) single-chip modem and are listed in the separate 73K224L (73K324L) data sheet. AUTOMATIC HANDSHAKE The 73D2248A/2348A will automatically perform a complete handshake with a called or calling modem and enter the data transfer mode. After the link between the two modems has been established, the modems may remain in the normal data mode or negotiate a link which has error control and data compression. Commands are provided to inform the modem which action is appropriate. TEST MODES The 73D2248A/2348A device set has provisions for three test modes: analog loopback, digital loopback and remote digital loopback. Analog loopback allows data to be sent into the local modem, have it modulated and then demodulated and returned to the local terminal. Digital loopback requires the cooperation of the user at the remote end and allows data to be sent to the remote modem, demodulated, then remodulated and returned to the local end. Remote digital loopback allows the same capability, without the need for a remote operator; signals are sent to the remote modem which perform the switching task that a remote operator would have done. AT COMMAND INTERPRETER The 73D2248A/2348A includes an AT Command Interpreter which is a superset of the Hayes 2400 Smartmodem ™ command set. Common application software will be able to control the modem though this interpreter. Additional commands have been added to provide for control of the MNP and CCITT V.42 modes. NON-VOLATILE MEMORY A serial NVRAM provides 256 bytes of storage for configuration information and telephone numbers. |
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