| 摘要 |
A system having an improved startup sequence for connecting two communicating modems, wherein the system includes a calling modem and an answer modem for communicating across an established communication link. Preferably, the system uses V.34 modulation protocol for information transfer after startup. In accordance with one aspect of the invention, an improved startup method includes the step of transmitting a unique calling signal from the calling modem, wherein the calling signal identifies the configuration of the calling modem. The modem "configuration" includes information relating to the communication capabilities of the modem, as well as information relating to the physical interconnection (or communication link) of the modem. The method further includes the step of transmitting a unique answer signal from the answer modem to the calling modem, wherein the answer signal identifies the configuration of the answer modem. Thereafter, the system operates to analyze the configuration of the calling modem and answer modem to determine whether the established link passes through a hybrid converter circuit. If the established link does not pass through a hybrid circuit, then the system omits line probing and echo training sequences that are typically executed in connection with the V.34 modulation standard. If, however, the established link does pass through a hybrid circuit, then the system proceeds with the execution of the line probing and echo training in accordance with the V.34 protocol.
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