JPH03155248A - Isdn digital telephone system terminal - Google Patents

Abstract

PURPOSE:To evade a state where the function of an integrated services digital network(ISDN) is lost due to a re-call by an invalid call by displaying busy when a bit representing the busy is detected with B1 and B2 bit serial-parallel conversion means. CONSTITUTION:For example, when B1 channel up and down bits BS1 and BR1 are converted in parallel at B1 channel up and down bit serial-parallel conversion circuits 7, 6 and are sent to a bit 1 detection circuit 8, the bit 1 detection circuit 8 sends B1 channel busy data BD1 to a data bus, therefore, a B1 channel busy lamp BL1 is lit. Since the lighting of the lamp is held for constant time with a holding circuit 10, no light-out occurs even when the output of the bit 1 detection circuit 8 goes to (0) in a moment. Thereby, it is possible to evade the state where the function of the ISDN is lost due to the invalid call, etc., when traffic is increased.

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 8 ISDN digital telephone terminals TEH (n is 11
~18) Alternatively, a non-telephone terminal (hereinafter, when both are included, it will simply be referred to as a terminal) can be connected.

The ISDN digital telephone terminal TE1 is a network interface section 1. Consists of a codec 2, a handset 3, a liquid crystal display 4, a telephone control unit 5, and a button Kn (n = 1 to 9 are numbers, 1□ is a number 0, K1゜ is a book, and K2 is #). Calls can be made by pressing the button directly or by speed dialing. In addition, the liquid crystal display 4 displays operation guidance for operations such as direct dialing or speed dialing.
Network information guidance such as "Tadai Macomi Atteolimas" is displayed. Incoming calls are sent to one network terminal unit [DsU (subscriber line) via direct dial-in (DDI) where multiple telephone numbers are assigned.
lling In), there is a normal case in which one telephone number is assigned to one subscriber line.
Depending on the broadcast format, a call setup message is transmitted from the SDN via the D channel to each rsDN digital telephone terminal TE, ... to TE1. sent to.

[Problem to be solved by the invention] ISDN digital telephone terminals TE11 to TE having the above configuration
, , ISDN digital telephone terminal TE1□ connects to other ISDN telephone terminal T in parallel to the same line.
Since the status of E1□ to TEi is unknown, there is no way to know the usage status of the two B channels of one line.Therefore, if both B channels are used, the ISDN protocol layer 3 call setting for outgoing When a (setup) message is sent, the network sends a reason indication information element identifier (#44: Requested line/channel unavailable, or
34: Release completed (r
e-1ease complete) is transmitted.

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 in order to eliminate the above-mentioned difficulties, and has the following features: B1. B, the series B1.B forming the transmitted code of the channel. B1 to convert B2 bits in parallel. To provide an ISDN digital telephone terminal capable of displaying B□, B2 charnet busy by providing a B2 bit serial/parallel converting means when a bit indicating that a call is busy is detected by the B2 bit serial/parallel converting means. It is an object.

[Means for Solving the Problems] An ISDN digital telephone terminal according to the present invention is connected to a network termination device by a bus cable, and has 64 bit 2 channels and 16 bit 1 channels B, +B, +D.
In an ISDN digital telephone terminal capable of accessing ISDN via a channel, the B□, Bf bit serial-to-parallel conversion means converts the serial B bits forming the transmission/reception code of the B2 channel into parallel, and the B□ , B1 and B2 channel busy display means for displaying busy when a bit indicating busy is detected by the B2 bit serial/parallel conversion means.

[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 4.

As shown in Figure 1, the ISDN digital telephone terminal TE
n (n is 1 to 8) is the network termination device D connected to ISDN.
Connected to SU via bus cable BUS. ISD
N Digital telephone terminal TE.

As shown in FIG.
is book, n; 12 is #), function keys FK1-F
K,, speaker sp and B1 channel busy lamp B
L1 and B2 channel busy lamps BL are implemented.

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 and -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 TE1 includes a network interface section 1, a codec 2, and a handset 3.
, liquid crystal display 4. 12, B2 channel busy lamps BL1, BL, B, B2 channel up and down code monitoring circuits BQ, BQ2 are provided in the function key FK button □~, and the telephone control unit 5 Storage of various data input/output to/from the data bus 5a under control;
reproduction.

It sends and receives communication performance meters and the like to and from the network interface section 1.

B engineering, B2 channel up and down code monitoring circuit BQ-,
B Q z is pin P of the network interface section 2. ~P, and the upstream and downstream frame signals FD2.
FD pins P2, Pl and B4, B3's B, B2 channel up and down bits BR, BS, BF2, and BS2 are monitored.

B Yucharne uplink and downlink code monitoring device RQ (hereinafter referred to as B
Regarding Q2, B1 is read as B2) is a B channel down bit serial/parallel conversion circuit 6 which receives the B1 channel down bit bit BR processing, a B channel upstream bit serial parallel conversion circuit 7 which receives the B channel upstream bit BS1,
Consists of a bit 1 detection circuit 8° timer 9 and a holding circuit 10, and B1 channel up and down bit serial/parallel conversion circuits 7 and 6 during up and down frame signal periods FD2 and FD1.
The bit string sent to the bit 1 detection circuit from
When "1" is detected, the holding circuit 10 holds the B□ channel busy data BD□ output to the data bus 5a for a period of time determined by the timer 9.

[Operation of the invention] ISDN digital telephone terminals TE1 to TE having the above configuration,
If none of them are used, layer 1 of the ISDN protocol is in a stopped state, and no signals are transmitted or received on one line.

When the ISDN digital telephone terminal TE~TE is in use, layer 1 becomes activated and network ink face section 1
B channel up and down code monitoring circuits BQ, (B.

In the channel, the subscript 1 is replaced with 2), and the up and down frame signals FD2 and FD of the B channel shown in FIG. 4 are monitored. For this reason, the B channel downlink bit serial/parallel conversion circuit 6 and the B channel upstream bit serial/parallel conversion circuit 7
In the T2 period shown in FIG.
The R and B□ channel upstream bits are input. B
8 channel downlink, downlink bit serial/parallel conversion circuit 7.6 B
□When channel up and down bits BS□ and BR□ are converted into parallel and sent to bit 1 detection circuit 8, bit 1 detection circuit 8 sends B and channel busy data BD to the data bus, so B1 channel busy Since the 0 lighting state in which the lamp BL1 lights up is held for a certain period of time by the holding circuit 1o, it does not turn off even if the output of the bit 1 detection circuit 8 momentarily becomes "0", and it remains in the "0" state for a certain period of time. or when layer 1 is in a stopped state, the B1 channel busy lamp BL□ goes out.

When using channels B1 and B in the above embodiment, when off-hook, a call setup message is sent to the ISD.
It cannot be sent to N, and the LCD display 4 shows "B Engineering, B.

"Channel is in use" may be displayed. Also.

Two-color display B, B2 channel busy lamp BL1゜B
L, and the red one is the own ISDN digital telephone terminal TE.
1. The green color may represent other ISDN digital telephone terminals TE.

[Effects of the Invention] The ISDN digital telephone terminal according to the present invention is connected to a network termination device by a bus cable, and consists of 64 bit 2 channels and 16 bit 1 channels B, +B2+D.
In an ISDN digital telephone terminal that can access ISDN on a channel.

Bi, B2 bit serial/parallel converting means for converting serial B2, B2 bits forming transmission and reception codes of the B1, B2 channels into parallel, and a bit indicating that a call is in progress is detected by the B1, B2 bit serial/parallel converting means. B□, which displays busy when the B2 channel is busy, is configured with a busy display means.
It has the effect of being able to display the busy status of B8 and B2 channels.

Furthermore, since no call setup message is sent to the ISDN network, a situation where the ISDN loses its functionality due to a re-call due to an invalid call does not occur.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of an ISDN digital telephone terminal according to the present invention, and FIG. 2 is an ISD diagram related to FIG.
3 is a block diagram of the ISDN digital telephone terminal related to FIG. 1, FIG. 4 is a time chart of the ISDN digital telephone terminal of FIG. 3, and FIG. 5 is a diagram of the conventional ISDN digital telephone terminal. FIG. 1 is a configuration diagram of an ISDN digital telephone terminal. 6...B E-channel downlink bit serial/parallel conversion circuit (
Serial/parallel conversion means) 7...B□Channel upstream bit serial/parallel conversion circuit (
(serial/parallel conversion means) DSU...Network termination device BLl...B, channel busy lamp (busy display means) BL,...B2 channel busy lamp (busy display means)

Claims (1)

[Claims] Connected to network termination equipment via bus cable, 64K bit 2
B_1 consisting of channel and 16K bit 1 channel
IS that can access ISDN via +B_2+D channel
In the DN digital telephone terminal, the above B_1 and B_2
B_1, B_2 in series forming the transmitting and receiving code of the channel
B_1, B_2 bit serial/parallel conversion means for converting bits into parallel; and B_1, B_2 bit serial/parallel conversion means to display busy when a bit indicating a call is detected is detected by the B_1, B_2 bit serial/parallel conversion means.
An ISDN digital telephone terminal characterized in that it is equipped with means for indicating that channels _1 and B_2 are busy.