| 摘要 |
An interface (4;12) between a data terminal (2;18) and a digital communications link (6,8,10) implements protocols and frame formats designed to reduce delays in a data communication with a remote terminal (18;2). The interface (4;12) overcomes the need to send or receive an HDLC SABME or UA control signal for establishing an asynchronous balanced mode, and allows data to be sent over the digital communications link (6,8,10) as soon as the communication parameters are established. In a non-ARQ (error correction) mode, the interface (4;12) sends control signals and data over the communications link (6,8,10) in frames subdivided into many small subframes of fixed length, each subframe having a length code indicating an amount of valid information but without CRC, address or control information.
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