JPH0251448U

JPH0251448U -

Info

Publication number: JPH0251448U
Application number: JP12964088U
Authority: JP
Priority date: 1988-10-03
Filing date: 1988-10-03
Publication date: 1990-04-11

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例によるＩＳＤＮ端
末装置を示すブロツク図、第２図はその動作手順
を示すフローチヤート、第３図は従来のＩＳＤＮ
における端末接続方式を示すブロツク図である。１７はＩＳＤＮ端末装置、１０はＩＳＤＮ加入
者インタフエース部、１１は情報信号チヤネルＢ
切替部、１２はアナログ回線インタフエース部、
１３はトーン発生部、１４は中央処理制御部、５
は記憶部。なお、図中、同一符号は同一、又は相
当部分を示す。 Fig. 1 is a block diagram showing an ISDN terminal device according to an embodiment of this invention, Fig. 2 is a flowchart showing its operating procedure, and Fig. 3 is a conventional ISDN terminal device.
FIG. 2 is a block diagram showing a terminal connection method in FIG. 17 is an ISDN terminal device, 10 is an ISDN subscriber interface section, and 11 is an information signal channel B.
A switching section, 12 is an analog line interface section,
13 is a tone generation section, 14 is a central processing control section, 5
is the memory section. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims

[Claims for Utility Model Registration] An ISDN subscriber interface unit connected to an ISDN (Integrated Digital Communication Network) subscriber line and multiplexing or separating an information signal channel and a control signal channel; and the ISDN subscriber interface unit. a central processing control unit that transmits and receives control signal channels from the above and controls the overall operation according to a program in a storage unit; and information that switches and connects the information signal channel of the ISDN subscriber interface unit by the central processing control unit. A signal channel switching unit, an A/D conversion function that converts an information signal channel to an analog signal or an analog signal to an information signal channel, a call current supply function, a DC closed circuit detection function, a dial pulse count function, and a DTM
In an ISDN terminal device equipped with an analog line interface section having an F receiver function and a tone generation section that generates various tones, it is possible to make a telephone call using an analog telephone connected to the analog line interface section. If a call is received from a third party while the telephone is in use, the third party's ringtone is sent from the tone generator to the analog telephone,
When the analog line interface section detects a hooking signal from the analog telephone, the ISDN subscriber interface section puts the information signal channel in progress on hold, and the information signal channel switching section switches to the third
When the analog line interface section detects a hooking signal from the analog telephone again, the ISDN subscriber interface section switches to the information signal channel for the third party incoming call to enable communication with a third party. The ISDN terminal device is characterized in that the information signal channel switching section opens the information signal channel of the original party on hold, and switches to the information signal channel of the original party on hold to enable a conversation with the original party. Incoming call processing method.