Showing papers on "Handshake published in 1988"

Integrated data voice multiplexer supporting handshake and loop-back protocols

Abstract: An integrated data voice multiplexer (IDVM) capable of simultaneously supporting loop-back and communication handshake protocols with no performance degradation. This allows the IDVM to be used in both point-to-point and packet switch networks. The IDVM is of the type using frequency shift keyed FSK modulation of two or more carriers to send a data signal. The presence or absence of carrier signals indicates loop-back state. Narrowband modulation is selectively added to at least one carrier to support handshake protocol. The preferred narrowband modulation is biphase at a rate lower than the FSK modulation rate. Encoder, decoder, data hold and detect circuits for supporting standard RS232 protocol are disclosed.

High level communication primitives for concurrent systems

Abstract: To support high-level specification and analysis of distributed systems, the authors propose two constructs: handshake and unit. The handshake construct is a remote procedure call generalized for multiple parties. The unit construct has three functions: to restrict the possible calls to various handshake procedures, to provide a synchronization mechanism, and to specify computation that is directly relevant to communication. These constructs are part of a formal model called the synchronous token based communicating state (STOCS) model, which lends itself to automatic analysis. These constructs can be added to any existing language easily, and the current system, called ConC (Concurrent C), extends C for concurrent programming. A prototype of the system runs on a Sun cluster operating under Unix 4.2 BSD. >

Modem with improved hand-shake function

Abstract: The preferred embodiment (11) of the modem comprises a control unit (13), a memory (27), a switch (14), and a modem engine (17) The modem engine (17) establishes communications with a modem (30) using conventional handshake methods The control unit (13) then initiates a special handshake sequence composed of nonprintable, opposing characters to the modem (30) via the switch (14) and the modem engine (17) If the modem (30) completes the special handshake sequence then the control unit (13) and the modem (30) exchange the desired information If the modem (30) does not complete the special handshake sequence then the preferred embodiment (11) functions as a conventional modem The use of nonprinting, opposing characters for the special handshake sequence prevents the special handshake sequence from adversely affecting the external devices (10) (34)