JPS63310245A - Communication terminal equipment - Google Patents

Abstract

PURPOSE:To decide which primary station can execute communication and which primary station cannot execute communication, and also, to surely inform its result, by providing a line state deciding means for deciding a line state to the primary station, from a received data, and an informing means. CONSTITUTION:A display part 17 of communication terminal equipments 21-2n displays a display of transmitting/receiving data and a line state to each primary station 41-4m separately, respectively. Subsequently, in each terminal equipment 21-2n, a power source is turned on, and when a telegraphic message is received in a transport level from an exchange system 1, a transport indicator and transmitting and incoming addresses are analyzed, from which primary station said message has been received is classified and decided, and also, the line state is displayed. That is, in each terminal equipment 21-2n, the line state to each primary station 41-4n is monitored in a transport level, and whether its line state is in a receivable state or an unreceivable state is displayed by the display part 17 and informed. In such a way, an operator of each terminal equipment can know easily the primary station which cannot transmit a data, and the workability of the operator can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication terminal that transmits and receives data to and from a plurality of primary stations via an exchange system.

[Prior Art] Conventionally, this type of communication terminal has performed transmission and reception at the data link level via a switching system with each primary station.

Note that the data link level protocol is a protocol that defines the transmission frame structure and basic procedures in the protocol layer, and generally includes HDLC (high level data link control) procedures and BSC (basic).
procedures are used. JIS for HDLC procedure
C6363, JIS C6364, JIS C6
It is standardized by H.365.

Frames, which are data link level transfer units, include a command frame sent by the primary station that controls the data link, and a response sent by the communication terminal that performs the data link control function by receiving the command frame. There is a frame. The command frame and response frame are further divided into an information transfer format (I frame) for transferring data, an unnumbered format (U frame) for managing the data link status, and a monitoring format (S frame) for monthly data transfer. It is classified as

Each of these formats consists of a flag sequence, an address field, a control field, an information field, etc.

In the monitoring format, RR means receivable for both commands and responses, and RNR means receivable. In the non-number format, SNR~1 in the command means normal response mode setting, and Disc means disconnection. In the response, UA means unnumbered confirmation and CMOR means command reject.

[Problems to be Solved by the Invention] However, if the communication terminal transmits and receives data to and from the exchange system at the data link level, even one of the multiple primary stations is capable of communicating. If so, the communication terminal determines that the line can be used, so even if the primary station in use is unable to communicate, it cannot determine this, and as a result, even if the primary station is unable to communicate, There was a problem with sending data.

This invention has been made in view of the above points, and therefore, an object of the present invention is to provide a communication terminal that can determine which primary stations are communicable and which primary stations are not communicable, and can reliably notify the result. That is.

[Means for Solving the Problems] The present invention provides a communication control unit that controls data transmission and reception at the switching system and transport level in a communication terminal that transmits and receives data via a switching system and a plurality of primary stations. and a line status determining means for determining the line status with each primary station based on the transport indicator of the data received by this communication control unit and the originating/terminating address, This system is equipped with a notification means for reporting the line status of each line.

[Operation] In the present invention having such a configuration, the line status determining means determines the content of the command from the transport indicator,
That is, it is determined whether reception is possible or unreceivable, whether the path is set up or the path is released, and which primary station is determined from the originating and receiving addresses. Then, based on the determination result, the notification means is operated to notify the line status with each primary station.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall system configuration, in which there are n communication terminals 21, 22 on one side for a switching system 1,
. . 2n are connected via the common line 3, and m primary stations 41, 42, . . . 4m are connected via the common line 5.

Previous Name Communication Terminal! As shown in Fig. 2, s2t to 2rL are CPUs (central processing units) that constitute the main body of the control section.
11. ROM (read only memory) 12 which stores program data etc. for this CPtJll to control each part, RAM (random・Access memory) 13, a communication control unit 14 that controls data transmission and reception with the exchange system 1, an input ink face 16 connected to an input unit 15 that issues data transmission commands, etc., and displays the transmitted and received data and each primary station 41
. . . 41. The display interface 18 is connected to a display section 17 having a function of individually displaying the line status with each of the terminals 41 to 41. Note that 19 is a pass line.

As shown in FIG. 3, the exchange system 1 includes a CPU 21 constituting the main body of the kindergarten department, and a ROM 2 in which program data etc. for the CPU 21 to control each part are stored.
2. A RAM 23 provided with a memory for storing transmitted and received data, a memory for storing data judgment results, etc., a communication control section 24 that controls data transmission and reception with each of the terminals 21 to 2n, and each of the 12th stations 41 to 2n. 41 and a communication control section 25 that controls data transmission and reception. In addition, 2
6 is a pass line.

The display section 17 consists of a CRT display, for example, as shown in FIG.
,...The line condition of 4m is, for example, Ht.

H2, . . . Hll are individually distinguished and displayed. The display method is as shown in FIG. 5 using a dedicated display element 20°20. ...
may be used to distinguish the line status of each primary station 41, 42, . . . , 41.

The CPU 21 of the switching system 1 is connected to each primary station 41 to 4.
m controls data transmission and reception using HDLC procedures,
Each of the communication terminals 12t to 2n performs data conversion and controls data transmission and reception at the transport level.

Regarding the control command and response, the format of the transport level data consists of a transport indicator (TI), a calling address (TA), and sense data (SD), as shown in FIG. 7(a). The data command is composed of a transport indicator (TI), a calling/terminating address (TA), and TU data, as shown in FIG. 7(b). and for the transport indicator (T I ) - ID
LC's? The command corresponding to the command in the J11] field is TLRR (transport level reception possible: corresponds to HDLC RR). ), TLRN
R (Temporary unreceivable of transport level; HDL
It corresponds to RNR of C. ), Engineering PS (transport level bus setting: compatible with HDIC SNRM), TPC (transport level bus release: H
Compatible with DLC DISC. ).

The CPU of each of the communication terminals 21 to 2 is a ROM 12.
Data transmission and reception control is performed based on the program data, and in particular, the processing shown in FIG. 6 is performed. That is, when the power is turned on, an initial 98 process is first performed, and in this process all H1 to 1-1m of the display section 17 are turned off. When the initial processing is completed, it waits to receive a message from the exchange system, and when it is received, it analyzes the originating/terminating address (TA) of the message to determine which primary station it came from. For example, if it is from the primary station 41 (H1 station), it is first checked to see if the bus has been set up, and if not, it is then checked to see if it is TPS reception. Then, if TPS is received, H on the display section 17 is displayed.
1 mark is lit.

Also, if the message is not received by TPS, the message will be ignored.

Additionally, if the bus has been set, the transport indicator (TI) command is analyzed, and if TLRNR is received, it is determined that reception is not possible and the H1 mark on the display section 17 flashes, and if TLRR or TPS is received, reception is possible. , determines the bus setting, lights up the H1 mark on the display section 17, and
If it is an O reception, it is determined that the path is released and the H1 mark on the display section 17 is turned off.

The above processing is the same for the primary stations 42 to 4 Ugly, and in this case, the H2 mark to Hm mark on the display unit 17 are controlled to be lit, blinked, and turned off, respectively.

Therefore, when each of the communication terminals 21 to 2 transmits and receives data to and from each primary station 41 to 41 via the exchange system 1, as shown in FIG. When a TPS is received from the primary station, a bus is established and data can be sent, and data is sent and received from the primary station.

After that, when TLRNR is received from the primary station, data transmission and reception is temporarily disabled in the bus established state.

Furthermore, when there is a TLRR reception from the primary station thereafter, data transmission and reception is enabled and data transmission and reception is performed again with the rf11 primary station. After that, when a TPO is received from the primary station, the path is not set, data transmission and reception is disabled, and data transmission and reception with the primary station is terminated.

In this embodiment with such a configuration, each communication terminal 2
When the power is turned on at 1~2, the H1~)-1m mark is kept off on the display section 17 of each communication terminal. When a message is received at the transport level from the inter-exchange system 1 in this state, the communication terminal analyzes the originating/receiving address <TA) and classifies and determines which primary station the message is from. Next, it is determined whether the bus has been set, and if the bus has been set, the transport indicator in the message is analyzed to determine whether it is TLRNR reception, TLRR reception, TPS reception, or TPO reception. And T
If LRNR reception is received, it is determined that reception is temporarily unavailable, and the display unit 17 displays H+ (
However, 1 flashes 1 to m). Also, if it is TLRR reception or TPS reception, it is determined that reception is possible and the display unit 1
At step 7, Hl indicating the corresponding primary station is lit. Also, if TPO reception is received, it is determined that reception is not possible and the display unit 1
At step 7, Hl indicating the corresponding primary station is turned off.

Further, when the message is received, the bus is not set and if TPS is received, the bus is set and H1 indicating the corresponding primary station is lit on the display section 17. Also, if the path is not set and a message other than TPS is received, the message is ignored.

Each communication terminal like this! At the f121-2n, the line status with each primary station 41-4 Ugly is monitored at the transport level, and whether the line status is ready for reception, temporarily unreceivable, or completely unreceivable. The corresponding H1~ on the display section 17 indicates whether the
Since the notification can be made by lighting, blinking, or extinguishing the Ha mark, the operator of the communication terminal can easily know which primary station is unable to send data, and therefore avoid sending data to that primary station by mistake. There is no danger. Also, if the line becomes available, you will be notified immediately.

In this way, since the line status of the primary station can be easily grasped, the operator's work efficiency can be improved.

In the above embodiment, the line status of each primary station is notified only by display, but the invention is not necessarily limited to this, and if the buzzer is activated at the same time as the display, it will be more reliable for the operator. can be prompted to check the line status.

[Effects of the Invention] As detailed above, the present invention provides a communication terminal filter that can determine which primary stations are communicable and which primary stations are not communicable, and can reliably notify the results. This is something that can be provided.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; FIG. 1 is a block diagram showing the overall system, FIG. 2 is a block diagram showing the configuration of a communication terminal, and FIG. 3 is a block diagram showing the configuration of the exchange system. , FIG. 4 is a diagram showing an example of line status display on the display unit, FIG. 5 is a diagram showing another example of line status display, FIG. 6 is a flowchart showing transport level analysis processing by the CPU of the communication terminal, FIG. 7 is a diagram showing a transport level data format, and FIG. 8 is a diagram showing a data transmission/reception format between a communication terminal and a primary station. 1...Switching system, 21-2L...Communication terminal, 3.5...Common line, 41-4Ill...Primary station, 11...CPU, (Central processing unit) , 12・
...ROM<read-only memory), 17...
Display section. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Figure 5 Figure 4 Figure 7 Figure 8

Claims (1)

[Claims] In a communication terminal that transmits and receives data via a plurality of primary stations and an exchange system, the communication control unit controls the transmission and reception of data with the exchange system at a transport level, and the transport of data received by the communication control unit.・Line status determining means for determining the status of the line with each of the primary stations from the indicator and the calling and receiving addresses; and reporting means for notifying the status of the line with each of the primary stations based on the determination result of the determining unit. A communication terminal device characterized by: