Patent ID: 6504919
Filing Date: 2003-01-07
Classification: H04N

Abstract:
A data transmission apparatus for determining modem control information in a procedure according to a communication protocol, comprising:a modem configured to execute the procedure as an ordinary procedure and a short procedure; a storage section that stores the modem control information for each destination apparatus; and a communication control section that instructs the modem of the data transmission apparatus to execute the short procedure when communication is performed with a destination apparatus, for which the modem control information is stored in the storage section wherein the modem of the data transmission apparatus transmits a shift notification signal indicative of a shift to the short procedure after transmitting a calling station identification signal to the destination apparatus, the shift notification signal including a signal pattern different from a signal pattern of a flag sequence specified by Recommendation T. 30, and wherein the shift notification signal includes a signal pattern of repetitions of â€œ0011â€ .