Data transmission system with V24 interfaces for control of bi-m

Details Data transmission system with V24 interfaces for control of bi-m Data transmission system with V24 interfaces for control of bi-m

1996-03-04

1998-02-17

Chin, Wellington

Pulse or digital communications

Transceivers

Modems

379 98, 395831, H04B 144

Patent

active

057199019

ABSTRACT:
A synchronous data transmission system includes modems and data packet switches having interfaces in compliance with CCIT recommendation V24. However, verification of correct operation of the modems is preferably carried out by the system control center by transmission of control instructions which are asynchronous, such as Hayes instructions. To make this possible without requiring additional circuitry, the modems are of the bi-mode type, having a synchronous and an asynchronous mode, and during control of a modem the interface circuits at the relevant packet switch are set to the asynchronous mode. The modem detects that condition of the packet switch interface circuit, and sets its own interface circuits to correspond therewith. The interface circuits are then reset to the synchronous mode after completion of the control operation.

REFERENCES:
patent: 4419751 (1983-12-01), Cholat-Namy et al.
patent: 4635275 (1987-01-01), Borg et al.
patent: 4715044 (1987-12-01), Gartner
patent: 4864601 (1989-09-01), Berry
patent: 5202899 (1993-04-01), Walsh
D. Behaghel et al., "Compac: The Multiservice Range For Data Switching", published in the journal Commutation & Transmission, No. 1, 1990.
CCITT Recommendation V24.
J.C. Inverinci et al., "New-Generation VLSI Modems", published in the journal Commutation & Transmission, No. 3, 1986.

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