| 摘要 |
<p>PURPOSE:To realize the communication service of D-channel packet data without deteriorating usual call control and service function. CONSTITUTION:An ISDN terminal equipment interface device 2 separates a D channel signal from each ISDN terminal equipment 1 into call control signal data and D channel packet data, the D channel packet data are sent to an ISDN interface device 4 through a time division multiplex switch 3 through while being subject to logical multiplex to an ISDN interface device 4 via the time division switch 3. The ISDN interface device 4 receives the D channel packet data via the time division switch 3 and sends the data to an ISDN 5.</p> |
