JPH03155247A - Isdn digital telephone system terminal - Google Patents

Abstract

PURPOSE:To prevent abnormal traffic occurring by monitoring empty filling data relating to a 2B channel inputted via a D channel, and displaying the busy of the 2B channel when the filling of the 2B channel is detected. CONSTITUTION:The empty filling of B1 and B2 channels are always monitored with a D channel monitoring circuit 6, and when the filling is detected, busy information is sent to a data bus 5a via a D channel buffer 7. A telephone control part 5 lights a B1 (B2) channel busy lamp BL1 (BL2) by receiving the busy information. Since all the operations of the D channel monitoring circuit 6 are performed at the ISDN digital telephone system terminals TE1-TE8, the B1 (B2) busy lamp LB1 (LB2) is lit even in the terminals TE2-TE8 other than the ISDN digital telephone system terminal TE1 transmitting by offhook at present. Thereby, it is possible to prevent the abnormal traffic occurring due to earthquake, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ISDN digital telephone terminal, and in particular to a B
This invention relates to an ISDN digital telephone terminal capable of displaying the busy state of a channel.

[Prior Art] Conventional ISDN digital telephone terminals are ISDN (Integrated Serial) terminals, as shown in FIG.
up to eight ISDN digital telephone terminals TEn (n is 11) via a bus cable BUS to the network termination unit DSU connected to the
~18) Alternatively, a non-telephone terminal (hereinafter simply referred to as a terminal when both are included) can be connected.

The ISDN digital telephone terminal device includes a network interface section 1, a codec 2, a handset 3, a liquid crystal display 4, a telephone control section 5, and a button Kn (n = 1 to 9 are numbers, and 11
is the number 0. 1° is made up of * and K-2 is made up of #), and calls can be made by dialing the button directly with your mouth or speed dialing. Further, the liquid crystal display 4 displays operation guidance for operations such as direct dialing or speed dialing, and network information guidance such as "Tadai Macomi Atteolimas". Incoming calls are made using Direct Dial-in (DDI...Direct Dial) where multiple telephone numbers are assigned to one network terminal unit DSU (subscriber line).
lingIn), in the normal case where one phone number is assigned to one subscriber line 0 In the normal case, ISD
Depending on the broadcast format, a call setup message is sent from N to each ISDN digital telephone system terminal TE1□ to TE, . . . via the D channel.

[Problem M to be solved by the invention] ISDN digital telephone terminal TE engineer with the above configuration, ~TE
1. Among them, the ISDN digital telephone terminal TE is connected to other ISDN digital telephone terminals TE1□ to TE1. which are connected in parallel to the same line. Since I don't know the status of
There is no way to know the usage status of the two B channels of the two lines. Therefore, if both B channels are used, the ISDN protocol layer 3 call setup for outgoing
UP) message is transmitted, the network transmits a release complete including a reason indication information element identifier (#44: Requested line/channel unavailable, or #34: Available line: no channel).

Therefore, an invalid call setup message is sent to the ISDN, and during peak hours or when traffic increases due to an earthquake, etc., this invalid repeat call can cause a situation where the ISDN loses its functionality. There are other difficulties.

[Object of the Invention] The ISDN digital telephone terminal according to the present invention has been made to eliminate the above-mentioned difficulties, and is an ISDN digital telephone terminal having the function of monitoring/displaying the usage status of two B channels of one line.
The purpose is to provide SDN digital telephone terminals.

[Means for Solving the Problems] An ISDN digital telephone terminal according to the present invention includes: a 2B channel idle/block monitoring means for monitoring idle data related to the 2B channel input via the D channel; The present invention is comprised of a 2B channel busy display means for displaying that the 2B channel is busy when the 2B channel is detected to be busy.

[Embodiment] An embodiment of the ISDN digital telephone terminal according to the present invention will be described in detail with reference to FIGS. 1 to 3.

As shown in Figure 1, the ISDN digital telephone terminal TE
I (n is 1 to 8) is the network termination device f connected to ISDN
It is connected to the DsU via a bus cable BUS. IS
DN digital telephone terminal TE.

As shown in FIG. Liquid crystal display 4, button Kn (n=1 to 9 are numbers, n=11 is 0, n=10
is book, n=12 is #), function keys FKi~F
K speaker SP and B channel busy lamp BL
, and an 82-channel busy lamp BL.

When dialing directly or speed dialing using the button Kn, the dialed numbers are displayed on the liquid crystal display. Further, when the function keys FK - FK are operated, a speaker call using the speaker SP, operation guidance such as real time display, charge display, etc., and network information guidance are displayed.

As shown in FIG. 3, the ISDN digital telephone terminal TE includes a network interface section 1, a codec 2, and a handset 3.
．． Liquid crystal display 4. Function key FK engineering ~ FK,,
A B2 channel busy lamp BLi, BL, a D channel monitoring circuit 6, and a D channel buffer 7 are provided on the button, and various data input and output to the data bus 5a under the control of the telephone control section 5. storage, playback, and exchange of communication parameters, etc. with the network interface section 1.

The D channel monitoring circuit 6 constantly monitors the B2 channel for blockage, and when the blockage is detected, the D channel buffer 7
Busy information is sent to the data bus 5a via the data bus 5a. The telephone control unit 5 receives the busy information and lights up the B-channel or B2 channel busy lamp LB1 (LB 2 ). This D
Since the operation of the channel monitoring circuit 6 is performed in all ISDN digital telephone terminals TE1 to TE, even TE2 to TE other than the l5Dl digital telephone terminal TE, which is currently off-hook and making a call, even B. Or the B2 channel busy lamp BL1 (BL2) lights up.

[Operation of the invention] When an ISDN digital telephone terminal with the above configuration makes a call from the ISDN digital telephone terminal TE1, an ISDN protocol layer 3 call is set up to the ISDN via the network interface unit 1, the bus cable BUS, and the network termination unit DSU. (se
tup) message is sent. ISDN digital telephone terminal TE□~TE.

The call setup message from the D channel monitoring circuit 6 and the first message sent from the network, such as call setup acceptance (c
(all proceeding) messages.

In the first message sent from ISDN, IS
Since the information channel B or B2 selected by the DN is written, this is stored in the telephone control unit 5. The telephone control unit 5 stores the call number used by the ISDN digital telephone terminal TE□ in correspondence with the stored B1 or B2 channel.

Next, the response (connect) message from ISDN is monitored, and upon arrival of the response message from ISDN,
Channel (BL or B) stored in the telephone control unit 5
B1 or B2 channel busy lamp BL corresponding to 2)
Turn on YO (BL2).

Further, when a call is received, a call setup message is transmitted from the ISDN in a broadcast format. This call setup message includes information on the ISDN selected information channel (
Since B□ or B2) is written, this is stored in the telephone control unit 5.

Next, the ISDN digital telephone terminal TE□ responds (c
oinect) message and a response confirmation (connect acknowledge) message from ISDN are monitored by the D channel monitoring circuit 6, and upon arrival of the response confirmation message from ISDN, the channel (B or Bz) stored in the telephone control unit 5 is monitored. ) corresponding to B□ or B2
Channel busy lamps LB, (LB2) are lit. The telephone control unit 5 stores the call number used by the ISDN digital telephone terminal TE in association with the stored B1 or B2 channel.

Other ISDN digital telephone terminals TE2 to TE.

B1 or B2 channel busy lamp LB□(
LB, ) is an ISDN digital telephone terminal TE Yode IS
The D channel monitoring circuit 6 monitors disconnection messages from the DN and ISDN digital telephone terminals TE. When these messages are sent from ISDN and ISDN digital telephone terminal TE ) is turned off.

The bus cable BUS in the above embodiment may have a star connection type.

[Effect of the invention] The ISDN digital telephone terminal according to the present invention is as follows.

2B channel empty blockage monitoring means for monitoring empty blockage data related to the 2B channel inputted via the D channel;
Since the monitor is configured with a 2B channel busy display means for displaying that the 2B channel is busy when the 2B channel is detected to be blocked by the monitoring means, abnormal traffic that confuses the ISDN with repeated calls due to invalid calls can be avoided. It has the effect of preventing

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an ISDN digital telephone terminal according to the present invention, FIG. 2 is a front view of an ISDN digital telephone terminal according to the present invention, and FIG. 3 is a diagram showing an ISDN digital telephone terminal according to the present invention.
Block Diagram of DN Digital Telephone Terminal FIG. 4 is a block diagram of a conventional ISDN digital telephone terminal. 6...D channel monitoring circuit (2B channel empty monitoring means) DSU...Network termination unit LB construction...B1 channel busy lamp (busy display means) LB,... B2 channel busy lamp (busy indicator)

Claims (1)

[Claims] Connected to the network termination equipment, the I
In an ISDN digital telephone terminal capable of accessing SDN, there is provided a 2B channel vacancy/occlusion monitoring means for monitoring vacancy/occlusion data related to the 2B channel input via the D channel; 2B channel busy display means for displaying that the 2B channel is busy when the 2B channel is detected.