JPH02253739A - Terminal adapter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Table of contents) Overview Industrial field of application Conventional technology Problems to be solved by the invention Examples of means and actions for solving the problems ■ Correspondence between the examples and FIG. 1 ■ , Structure of the embodiment■, Operation of the embodiment■, Summary of the embodiment■1 Modification of the invention Effects of the invention [Summary] Regarding a terminal adapter that accommodates a non-ISDN terminal device in one SDN using a line switching method, terminal attributes are The purpose is to enable communication in different cases between sending and receiving, and includes a line connection means for connecting with ISDN, a speed matching means for converting the speed of communication data, and an attribute conversion means for converting the attributes of communication data. and a terminal connection stage for connecting to a non-ISDN terminal device, and is configured to enable communication with a destination terminal device that does not have the same terminal attribute.

[Industrial application field]

The present invention relates to a terminal adapter, and in particular, when accommodating non-ISDN terminal devices of the CCITT Recommendation v C Recommendation series in an ISDN using a circuit switching system, even if the terminal attributes of the transmitting and receiving terminal devices are different from each other, they can be used interchangeably. This is about a terminal adapter that can be connected to.

[Conventional technology]

FIG. 8 shows an explanation of the prior art, and FIG. 9 and FIG. 1O show an explanation of a call control sequence.

In FIG. 8, a conventional terminal adapter 810I
is a line interface circuit sii.

Speed matching circuit 813 that performs data speed conversion using the CC1TT recommendation ν, 110 or x, 30 speed matching method.
1° data terminal interface circuit 815. ,CPtJ
817I and a data buffer 8191.

In FIG. 9, a terminal adapter 8101 and a terminal adapter 810□, which have the same configuration as the terminal adapter 810I, are non-ISDN data terminal devices (not shown) that have the same terminal attributes such as parity and stop bit length. When connected to the terminal adapter 810, the terminal adapter 8102 from the side
The call control procedure when making a call to the other party is shown below. Note that these two data terminal devices are 64. Data transmission is performed at a speed of kbps or higher. Additionally, a terminal adapter 810.
The terminal attributes of the data terminal devices connected to the terminal adapter 8102 and the terminal adapter 8102 are set in advance (FIG. 9, ■).

The data/evening terminal device on the sending side is the terminal adapter 8101.
When the terminal adapter 810I notifies the caller of the outgoing call (■ in Figure 9), a call setting message is sent from the terminal adapter 810I to the I
It is sent to SDNfi (abbreviated as "network" hereafter).

This call setup message incorporates a low-level ray) and consistency information element (LLC) indicating the terminal attributes of the transmitting data terminal device (FIG. 9). When the station receives the call setup message, it connects the terminal adapter 810 . A call setup acceptance message is returned to (■ in Figure 9).

Immediately, a terminal adapter call setup message is notified. This message includes the low layer compatibility information element set by the terminal adapter 8101 (FIG. 9 - ). The terminal adapter 810g checks whether the lower layer compatibility information element matches the data terminal device connected to the terminal adapter 81O2 (Fig. 9), and since they match, the incoming call is sent to the receiving data terminal device. It sends out a notification (Fig. 9 (■)), and at the same time notifies the network of a paging message (Fig. 9 (■)). Terminal adapter 810 from the network,
When a call message is notified to , (Fig. 9■)
, the terminal adapter 8101 displays the call to the sending data terminal (FIG. 9 [phase]).

Next, the receiving data terminal device is connected to the terminal adapter 81.
When the terminal adapter 8102 notifies the response message to the terminal 0□ (FIG. 9 0), the terminal adapter 8102 notifies the network 2 of the response message (FIG. 9 ■), and the network sends a response message to the terminal 7 adapter 810. (Fig. 9 @). Upon receiving this notification, the terminal adapter 8IO+ sends a call stop message to the sending data terminal (Fig. 9 0), and the B channel for communication is They are mutually connected (σφ in FIG. 9). 1
Since the speed of 3 channels is 64 kbps, the 64 kbps data sent and received by the data terminal device is processed by the speed matching circuit 813I of the terminal adapter 8101.
CITT Recommendation V. lIO, or X. The speed is converted to 64 kbps by the speed matching circuit 8132 of the terminal adapter 8102.
T Recommendation v6110 or X. 64. The data terminal device on the receiving side can process using the 30 speed matching method. The speed is converted to a speed of kbps or less, and the data is received by the data terminal device on the receiving side.

[Problem to be solved by the invention]

However, in the above-mentioned conventional apparatus, there is a problem in that if the terminal attributes of the transmitting data terminal device and the receiving data terminal device are different, mutual communication cannot be performed.

As shown in FIG. 10, terminal adapters 81, 0
1 and terminal adapter 810□, the lower layer compatibility information element included in the call setup message sent from terminal adapter 8101 is transferred to the receiving side by terminal adapter It is determined that the terminal attribute matches or does not match the terminal attribute of the data terminal device (Fig. 10 ■), and the terminal adapter 810z sends a release completion message to the station with an information element indicating the reason that the terminal attribute does not match (Fig. 10). Figure 10 ■). When the release completion message is received, the cable notifies the release completion message to the terminal adapter 8101, and the connection of the B channel for communication does not occur (Fig. 10 (■)).

The present invention consists of 1. It was created in consideration of these points, and is a non-ISD that has different terminal attributes for sending and receiving.
The present invention aims to provide a terminal adapter that enables N terminal devices to communicate with each other in ISDN.

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the terminal adapter of the present invention.

In the figure, line connection means 111 connects to ISDN.

The speed matching means 113 performs speed conversion of communication data.

Attribute conversion means 115 converts the attributes of communication data.

The terminal connection means 1.17 connects to non-ISDNi terminal equipment.

Therefore, as a whole, the attributes of the data to be transmitted or the data to be received are converted by the attribute conversion means 115.

[Operation] When used as a called party, first, terminal attributes are set in the attribute conversion means 115 from the terminal attribute information transmitted during call setup. When the B channel is connected, the data sent and received via the first line connection stage 111 is speed-converted by the speed matching means 113, and the speed-converted data is sent to the terminal by passing through the attribute converting means 115. Converts the data into data that can be processed by the data terminal device connected to the adapter, and connects the terminal to 1 stage 1.
17 to and from the data terminal device.

When used as a calling party, first, during call setup, a call setup message containing terminal attribute information is sent to the line connection means 1.
11 and attempt to connect the B channel. At this time, if the terminal attributes do not match those of the destination data terminal device, the attribute conversion means 115 changes the terminal attributes in various ways and transmits a call setup message until the B channel becomes connectable. After the B channel connection, the data transmitted from the data terminal device connected to the terminal adapter is received via the terminal connection means 117, and then converted into data that can be communicated with the destination data terminal device by the attribute conversion means 115. After the conversion, the speed is converted by the speed conversion means 113 and transmitted to the destination data terminal device via the line connection means 1.11.

Regarding the data that the terminal adapter receives from the data terminal device on the other side via the terminal adapter on the other side, the data terminal device connected to the terminal adapter in question follows the reverse route to that described above and can receive the data. It is converted into an attribute and received.

According to the present invention, communication between non-ISDN terminal devices having different terminal attributes between transmitting and receiving is possible. [Embodiments] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 shows the configuration of a network system including an embodiment,
FIG. 3 shows the configuration of a terminal adapter in one embodiment of the present invention.

(1) Here, the correspondence between the embodiment of the present invention and FIG. 1 will be shown.

The line connection means 111 connects the line interface circuit 21.
Corresponds to 1.

Speed matching means 113 corresponds to speed matching circuit 213.

The attribute conversion means 115 corresponds to the attribute conversion processing section 215.

The terminal connection means 11.7 correspond to the data terminal interface circuit 221.

Examples of the present invention will be described below assuming that the correspondence relationship as described above exists.

■-S1. ■9 Hashikai 7 In FIG. 2, in this network system, a data terminal device 231 is connected to a terminal adapter 210 via an interface cable, and a data terminal device 231 is connected to a terminal adapter 210 via an interface cable.
33 is connected to the aforementioned terminal adapter 810 via an interface cable. The two data terminal devices 231 and 233 are non-ISDN terminal devices having different terminal attributes. For example, the data terminal device 231 sends and receives data at 4.8 kbps, and the data terminal device 233 sends and receives data at 9.8 kbps. It is assumed that data is sent and received at 6 kbps. Terminal adapter 210 is also connected to a network termination device (not shown), which is connected to network 235 . Similarly, terminal adapter 810. is connected to another network termination (not shown), which is connected to network 237. On this ISDN line, one D channel for call control and two B channels for communication are available for communication between both data terminal devices 231 and 233.

In FIG. 3, the terminal adapter 210 of the embodiment includes a line interface circuit 211 and a CCNTT recommendation v.
, iio, or χ, 30 speed matching circuit 213 that performs speed conversion of data using a speed matching method, attribute conversion processing unit 215 that converts terminal attributes of transmitted and received data, data terminal interface circuit 221, and CPt12.
The attribute conversion processing section 215 consists of a first conversion processing section 217 and a second conversion processing section 219. Further, the CPU 223 includes a ROM that stores programs and a RAM that serves as a work area.

The data buffer 225 is used to temporarily store data when data is transferred between the first conversion processing section 217 and the second conversion processing section 219 in the attribute conversion processing section 215.

The first conversion processing unit 217 includes a data terminal device 2 connected to the terminal adapter 210 by the CPU 223.
31 terminal attribute values are set, and based on the terminal attribute values, the first conversion processing unit 217 converts the data terminal! ff1231
Converts data to be transmitted to or data transmitted from data terminal device 231. In addition, the second conversion processing unit 219
is the data terminal device 23 of the terminal adapter 8101
If the terminal attribute value of No. 3 is known, that terminal attribute value is set, and the data to be transmitted is converted based on it.

,,L, Embodiment 9 - Operation Next, the operation of the terminal adapter 210 of the above-mentioned embodiment will be explained separately for the incoming call operation and the outgoing call operation.

-1-UigJ Masterpiece- Fig. 4 shows the call control procedure for incoming calls, and Fig. 5 shows the operation of incoming call processing. Note that the terminal attributes of the data terminal device 231 are set in advance in the first conversion processing unit 217 of the terminal adapter 210, and the terminal attributes of the data terminal device 231 are set in advance. The terminal attribute of the data terminal device 233 is set to -t in the speed matching circuit 813 (FIG. 4).

The data terminal device 233 sends a call to the terminal adapter 8.
10I (Fig. 4), the terminal adapter 8101 sends a call setup message to which terminal attributes such as parity, stop pit, and synchronization method are added as lower layer compatibility information elements via the 1] channel! 4
237 (Fig. 4 ■), and the terminal adapter 810 receives the call setup message from the network 237.
．． A call setup acceptance message is sent back (■ in Figure 4).

The call setting message sent from the network 237 is received by the network 235 via ISDN, and further sent to the terminal adapter 210 (FIG. 4 and step 511). The call setup message is interpreted by the CPU 223 of the terminal adapter 210, and it is checked whether the low layer compatibility information element included in the call setup message matches the terminal attributes of the data terminal device 231 connected to the terminal adapter 210. (Fig. 4 and step 513). If they do not match, the CPtJ 223 sets the terminal attribute value in the second conversion processing unit 219 based on the transmitted low layer compatibility information element so as to enable communication with the data terminal device 233 (the fourth Figure ■ Stenbu 515). Thereafter, the data terminal interface circuit 221 notifies the data terminal device 231 of the incoming call (Fig. 4 ■), and at the same time, the terminal adapter 2
10 sends a paging message to network 235 (FIG. 4 and step 517).

When the paging message is transmitted to the network 237 via the 1sDN and notified to the terminal adapter 810I by the MA 237 (FIG. 4 [phase]), a paging indication is sent to the data terminal device 233 by the terminal adapter sio. (Figure 4 ■).

Terminal adapter 21 by data terminal device 231
0 (FIG. 4, 0), the terminal adapter 210 notifies the network 235 of a °ζ response message (FIG. 4@step 519). When the response message is received by the network 237 via the rsDN, the network 237 notifies the terminal adapter 8101 of the response message (FIG. 40). When you receive this notification,
Terminal adapter 810. The call display to the data terminal device 233 is stopped (Fig. 4 ■), and the B channel for communication is connected and data communication (5) is performed (Fig. 4 [Phase]).
).

During communication after connecting B channel °C, data terminal device 2
Regarding the data transmitted by terminal adapter 8101, °ζ is the speed matching circuit 8°13.33 of terminal adapter 8101. is converted into 64kb of data. The 64 kbps data is sent to the line interface circuit 21 of the terminal adapter 210 from 1 to 100% by the connected B channel.
1, and first, the speed matching processing circuit 213
The speed is converted by Next, the second conversion processing unit 219 removes the terminal attribute of the received data and stores it in the data buffer 225, and the first conversion processing unit 217 converts the stored data into data that can be processed by the data terminal device 231. Data terminal interface circuit 22
1 to the data terminal device 231 via the bus.
be done.

Data transmitted from the data terminal device 231 is also transmitted to the data terminal device 233 by following the reverse procedure.

ii) - Investigation - Operation FIG. 6 shows the call control procedure in the outgoing call, and FIG. 7 shows the operation of the outgoing call process. Note that the terminal attribute of the data terminal device 231 is preset in the first conversion processing unit 217 of the terminal adapter 210, and the terminal attribute of the data terminal device 233 is set in the terminal adapter 8101 (the sixth Figure ■).

The call is from the data terminal device 231 to the terminal adapter 2
10 (■ in FIG. 6), a lower layer compatibility information element based on the terminal attribute of the data terminal device 231 set in the first conversion processing unit 217 by the terminal adapter 210 is set in the call setup message. (Step 7
11). This call setup message is sent by the line interface circuit 211 to the network 235 via the l) channel (Fig. 6 and step 713), and the 4M
When the call is accepted by the network 235, a call setup acceptance message is sent to the terminal adapter 2'1O by the network 235 (FIG. 6 and step 715).

The call setup message received by the network 237 via ISDN 7 is sent to the terminal adapter 810 (FIG. 6). Terminal adapter 8101 detects that the lower layer compatibility information element included in the received call setup message is the terminal adapter 810. It is checked whether the terminal attributes match the terminal attributes of the data terminal device 233 connected to the network 237, but since they do not match (Fig. A completion message is notified (Fig. 6 ■). 1237 sends this release completion message to the network 235, and 8jil 1235 sends this release completion message to the terminal adapter 210 (FIG. 6 -).

When the terminal adapter 21.0 receives the message through the line interface circuit 211 (step 717), the CPLI 223 analyzes that the message is a release completion message (step 719).
From the information set in the release completion message, it is analyzed that the reason for disconnection is a mismatch in terminal attributes (Steps 721 and 723), the lower layer consistency information element is reset, and the terminal attributes of the second conversion processing unit 219 are set. (FIG. 6 ■ and step 725).

A call setup message containing the newly configured low layer compatibility information element is sent to the network 235 by the line interface circuit 211 (FIG. 6 [phase] and step 713), and the call setup message is received and uninterrupted by the network 235. When the network 235 connects the terminal adapter 210
A call setup acceptance message is sent to (2) in FIG. 6 and step 715. .

Call setup messages received by network 237 are sent to terminal adapter 810 . (FIG. 6o), and is sent to the terminal adapter 810. checks whether the lower layer compatibility information element included in the received call setup message matches the data terminal equipment 233 connected to the terminal adapter 810 . Since the lower layer compatibility information element transmitted again does not match the terminal attribute of the data terminal device 233 (Fig. 6 ■), the terminal adapter 8101
sends a release completion message to the y4235 2 (FIG. 6), and the network 235 sends a release completion message to the terminal adapter 210 (FIG. 6 0).

When the CPU 223 of the terminal adapter 210 receives the message (step 717), it analyzes that the message is a release completion message and that the reason for the disconnection is a terminal attribute mismatch (step 719.7).
21 and 723), the lower layer compatibility information element is reset again, and the terminal attribute of the second conversion processing unit 219 is set ((2) in FIG. 6 and step 725).

These series of procedures (FIG. 6 - ■) are repeated until the terminal adapter 210 receives and receives a paging message from the network 235 (FIG. 6 -).

In the following, a case will be described in which the terminal adapter 210 receives a paging message from the network 235 after repeating step (1) in FIG. 6.

A call setup message containing the newly configured low layer compatibility information element is sent to the network 235 via the D channel (FIG. 6 and step 713), and the call setup message is received by the When the lock is removed, lock 235
A call setup acceptance message is sent to the terminal adapter 210 (FIG. 6 and step 715).

The call setup message is sent to terminal adapter 8101 (FIG. 6 [phase]) and sent to terminal adapter 810.
The lower layer compatibility information element contained in the received call setup message is transmitted to the terminal adapter 810. It is checked whether it matches the data terminal device 233 connected to. In this case, the low layer compatibility information element is
Since it matches the terminal attribute of 810.33 (Fig. 6 ■), the terminal adapter 810. sends a notification to the data terminal device 233 of the incoming call (FIG. 6, 0), and at the same time notifies the network 237 of a paging message (FIG. 6, O).

The network 235 receives the paging message sent by the network 237, and notifies the terminal adapter 210 of the paging message (Fig. 6 ■). Upon receiving the paging message (step 717), the terminal adapter 210
notifies the data terminal device 231 of the call (FIG. 6, 125)).

The data terminal device 233 on the called side is the terminal adapter 8
1.0+ (FIG. 6 (Φ)), the terminal adapter 810. notifies the network 237 of a response message 7 (FIG. 6, 6), and the network 235 that received the response message sent from 4M237. is terminal adapter 21
A response message is sent to 0 (Fig. 6@). Upon receiving the response message (step 729), the terminal adapter 210 stops displaying the call to the data terminal device 231 that made the call (Fig. 6@), and the B channels for communication are connected to each other to perform data communication. (Figure 6 @
).

In the data communication after the 13 channel is connected, the data transmitted from the data terminal device 231 is taken into the terminal adapter 210 by the data terminal interface circuit 221, and sent by the first conversion processing section 217 (included in the transmitted data). The terminal attributes that are displayed are removed and stored in the data buffer 225. The data stored in the data buffer 225 is converted by the second conversion processing unit 219 into the terminal attributes handled by the data terminal device 233, and is stored in the data buffer 225. This converted data is further converted into 64kbp by the speed matching circuit 213.
s data and sent to the line interface circuit 211.
Sent by When data is received by the terminal adapter 8101 via ISDN, the speed matching circuit 8
131, the data is converted into attribute data handled by the data terminal device 233 and transmitted to the data terminal device 233. Data transmitted from the data terminal device 233 is also transmitted to the data terminal device 233 by following the reverse procedure.
will be received.

In the procedure of FIG. 6 [phase], if the lower layer compatibility information element included in the call setup information transmitted by the terminal adapter 210 and the terminal attribute of the data terminal device 233 do not match, , terminal adapter 21
0 continues to retransmit the call setup message by changing the combination of terminal attributes until the paging message is sent. In addition, if the disconnection reason is not set in the release completion message, and if the I-9 and the terminal attribute combinations that can be set are exhausted, an error notification is sent to the user of the data terminal device 231, and a re-call operation is performed. is terminated (step 731).

! V4- The end of the rally! ! In this way, the terminal adapter converts the terminal attributes of the data sent and received, so it is easy to convert the non-I81''IN terminal device into an I81''IN terminal device without overwriting the terminal attributes of the terminal device.
It can be accommodated in SDN.

and 237 and 7, but the invention is not limited to this.

Furthermore, although the correspondence between the present invention and the embodiments has been explained in 1.I. Correspondence between the embodiments and FIG. 1, the present invention is not limited to this. Those in the know can easily guess that there are various forms of deformation.

[Effect of the invention] As described above, according to the present invention, non-1.3 D N
It becomes easy to accommodate the terminal device in the ISDN, and it is extremely convenient for practical use.

■Variations of the invention (1) In the embodiment of the present invention described above, the format of the transmission path is two B channels and one D channel (I forming a channel).
Although the SDN basic interface is used, the present invention is not limited to this.

Additionally, the network system is configured using two terminal adapters 210 and 810. ．． Two data terminal devices 231
and 233 and net 2; ] 5 and

[Brief explanation of drawings]

The first part is a 1.1 link diagram of the principle of the terminal adapter of the present invention, Figure 2 is a configuration diagram of a network system including an embodiment, and Figure 3 is a configuration block diagram of a terminal adapter according to embodiments of the present invention. Figure 4 is an explanatory diagram 2 of the call control procedure for incoming calls, Figure 5 is a flowchart of the incoming call processing operation, Figure 6 is an explanatory diagram of the call control procedure for outgoing calls, Figure 7 is a flowchart of the outgoing call processing operations, and Figure 8 is the conventional FIG. 9 is an explanatory diagram (1) of a conventional call control procedure, and FIG. 10 is an explanatory diagram (2) of a conventional call control procedure. 225.819 is a data buffer, 231 and 233 are data terminal devices, and 235.237 is a network. In the figure, 111 is a line connection means, 113 is a speed matching means, 115 is an attribute conversion means, 117 is a terminal connection means, 210.810 is a terminal adapter, 211.811
is a line interface circuit, 213.813 is a rate matching circuit, 215 is an attribute conversion processing section, 217 is a first conversion processing section, 219 is a second conversion processing section, 221.815 is a data terminal interface circuit, 22
3.817 is the CPU, 4m, 2 and Toe'i'f-;ri Rr'fJ Figure 5

Claims (1)

[Claims] (1) Line connection means (111
), and speed matching means (113) for speed conversion of communication data.
and attribute conversion means (115) for converting the attributes of the communication data.
), and a terminal connection means (117) for connecting to a non-ISDN terminal device.
1. A terminal adapter comprising: