JP3068148B2 - ISDN user / network interface connection method via high-speed digital line - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to ISDN (Integr
ated Services Digital Network) User-network interface method, especially in transmission of time-division multiplexing equipment including high-speed digital line, ISDN terminal connected to ISDN user-network interface via high-speed digital line and ISDN DSU (Digital Service) Unit, home data line terminating equipment) via a high-speed digital line for communication
It relates to the ISDN user / network interface system.

[Conventional technology]

Conventionally, as this type of interface technology, a technology for interface connection to an ISDN user / network interface and a technology for interface connection to a high-speed digital leased line exist independently of each other.

As shown in FIG. 2, the terminal 206 for ISDN
It is connected to the SDN basic interface S point 205 and connected to the NT1202 as the network line termination function through the ISDN basic interface T point 203 which is the junction point between the user side and the network side via the NT2204 as the line connection control function. It is connected to the network 201.

The ISDN terminal 206 uses a layer 1 to layer 3 protocol defined by the ISDN user / network interface.
Receive the services of the ISDN network.

In addition, as shown in FIG.
Is connected to the high-speed digital line 302 via the high-speed digital line interface unit 303.

[Problems to be solved by the invention]

The conventional interface technology described above does not assume that a network for ISDN terminals to receive the services of the ISDN network via a high-speed digital line. Since the control method between the terminal and the time-division multiplexing device in the case of a network configuration for connecting the ISDN network DUS is not specified, the protocol of the layer 1 to layer 3 specified in the ISDN user / network interface is not specified. There is a problem that a communication procedure cannot be secured.

An object of the present invention is to eliminate the above-mentioned drawbacks, and through a high-speed digital line which can secure the communication procedure of the layer 1 to layer 3 protocol even through a time-division multiplexing device coupled via a high-speed digital line. An object of the present invention is to provide an ISDN user / network interface connection method.

[Means for Solving the Problems] ISDN users via the high-speed digital line of the present invention
The network interface connection system comprises a first time division multiplexer having an interface for connecting to an ISDN user / network interface S point and an interface for connecting to a high-speed digital line; an interface for connecting to an ISDN user / network interface T point; In the ISDN user / network interface connection system via a high-speed digital line comprising a second time-division multiplexer having an interface for connecting to a high-speed digital line, the first and second time-division multiplexers are provided. Is defined in the ISDN basic interface frame from the first time division multiplexer to the second time division multiplexer when the ISDN user / network interface S deviates from the synchronized state. Abnormality at S point by turning off the S point status notification bit time slot After the notification, the second time-division multiplexing device receives the notification and, after receiving the notification, the terminal connected to the ISDN user / network interface S point is “Not Ready” with respect to the ISDN user / network interface T point. When the ISDN user / network interface T point deviates from the synchronous state, the ISDN basic interface frame is defined from the second time division multiplexer to the first time division multiplexer. By turning off the T point status notification bit time slot, an abnormality at the T point is notified, and after receiving the notification, the first time division multiplexing apparatus transmits the IS to the ISDN user / network interface S point.
It is performed by notifying that the terminal connected to the DN user / network interface T point is "Not Ready".

Example Next, the present invention will be described with reference to the drawings.

FIG. 1A is a configuration diagram of an embodiment of the present invention. The embodiment shown in FIG. 1 (a) is an ISDN terminal 101 connected to an ISDN basic interface S point 102 as an ISDN user / network interface, and an S point interface unit as an interface connected to the ISDN basic interface S point 102.
High-speed digital line interface unit 105 as an interface for connecting to 103 and high-speed digital line 106
Time division multiplexing device as first time division multiplexing device provided with
104 and ISD as ISDN user / network interface T point
A time division multiplexing device 116 as a second time division multiplexing device having an interface T point interface portion 107 connected to the N basic interface T point 108 and a high-speed digital line interface portion 105, and connection to an ISDN basic interface T point And the ISDN DSU 109.

 Next, the operation of the embodiment shown in FIG. 1 will be described.

The time-division multiplexing device 104 transmits data from the ISDN terminal 101 using a control signal between the ISDN terminals 101 in a data configuration shown by a frame 110 in FIG. 1B. Frame 110
Are the time slot 111 for the B1 channel, the time slot 112 for the B2 channel, and the time slot 113 for the D channel.
And the ISDN basic interface S, T point layer 1 for notifying the layer 1 status on the ISDN basic interface S, T point in addition to the M bit, A bit, S bit timestamp 114
The status notification bit has a time slot 115.

The data indicated by the frame 110 is bidirectionally transmitted through the high-speed digital line interface unit 105 and the high-speed digital line 106.

The ISDN basic interface S point 102 and T point 108 are normally transferred by the interface S point interface unit 103 of the time division multiplexer 104 and the interface T point interface unit 107 of the time division multiplexer 116, respectively. It is kept in the "synchronous" state, as it is called in the table.

Now, the interface S point interface unit 103 is ISD
At the N basic interface S point 102, when it is found that the state has shifted from the above-mentioned "synchronous" state, the time division multiplexing apparatus 104 transmits the signal to the time division multiplexing apparatus 116 via the high-speed digital line 106 as shown in FIG. Frame 110 shown in (b)
Out of the data of the ISDN basic interface S point and the T point layer 1 status notification bit time slot 115 in the "OFF" state, for example, "0", and sends the ISDN basic interface-point 1 to the interface T point interface unit 107.
Notify that the state on 02 is in an abnormal state not synchronized with the state on ISDN basic interface T point 108. Interface T point interface unit 107 receiving this notification
Sets the status on the ISDN basic interface T point out of the above "synchronization"
Notification that the terminal is in a "NOT READY" state where correct communication cannot be secured.

When a transition to the state deviating from the above-mentioned "synchronization" occurs at the ISDN basic interface T point 108, the interface 110 uses the frame 110 shown in FIG. Similarly, it notifies the S point interface unit 103 that the state on the ISDN basic interface T point 108 is out of synchronization and abnormal. Interface S receiving this
The point interface unit 103 is an ISDN basic interface S
ISDN by setting the status of the department to deviate from "synchronous"
The terminal 101 is notified that the ISDN network is in a "NOT READY" state.

In this way, the state of the ISDN basic interface S point and T point is notified by the accommodated interface S point interface 103 and the interface T point interface unit 107 between the time division multiplexing devices 104 and 116 facing each other via the high-speed digital line 106. Then, the opposing time-division multiplexing device (b) uses the notification result based on the notification result to set the ISDN terminal 10
1 and DSU 109 for ISDN can be connected for layer 1 communication /
By notifying the prohibition, protocol communication of layer 1 can be secured, and protocol communication of layers 2 and 3 can be secured.

〔The invention's effect〕

As described above, the present invention provides an interface unit corresponding to ISDN basic interfaces S point and T point to a time division multiplexing device opposed via a high-speed digital line,
By notifying the state of each interface to be connected and controlling the layer 1 state transition of the interface part in accordance with the interface part feeling, the layer 1 of the ISDN basic interface can be connected via a high-speed digital line.
By communicating the connection / non-connection state indicating whether protocol communication is possible or not, it is possible to secure not only layer 1 but also layer 2 and layer 3 protocol communication, and the high-speed digital line This has the effect of realizing the service of ISDN basic interface connection.

[Brief description of the drawings]

FIG. 1 (a) is a block diagram of an embodiment of the present invention, FIG. 1 (b) is a data format between time-division multiplexing devices in the embodiment of FIG. 1 (a), and FIG. FIG. 3 is a configuration diagram showing an example of an ISDN basic interface, and FIG. 3 is a configuration diagram showing a connection state of a conventional high-speed digital line and a time division multiplexer. 101 ... ISDN terminal, 102 ... ISDN basic interface S
Point 103 103 S point interface unit 104 104 116 Time division multiplexer 105 High speed digital line interface unit 106 High speed digital line 107 Point T interface unit 108 ISDN basic interface T Points, 109
... DSU for ISDN, 110 ... Frame, 111 ... Time slot for B1 channel, 112 ... Time slot for B channel, 113 ... Time slot for D channel, 114 ... M bit, A bit, S bit Timeslot 115 ISDN
Basic interface S, T point layer 1 status notification bit time slot.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04M 3/00 H04Q 3/42 H04J 3/00-3/26

Claims (1)

(57) [Claims] A first time-division multiplexer having an interface for connecting to an ISDN user / network interface S point and an interface for connecting to a high-speed digital line; an interface for connecting to an ISDN user / network interface T point; A second time-division multiplexing device having an interface connected to a digital line; and a first and second time-division multiplexing device, wherein the first and second time-division multiplexing devices are connected via a high-speed digital line. Is defined in the ISDN basic interface frame from the first time division multiplexer to the second time division multiplexer when the ISDN user / network interface S point deviates from the synchronization state. By turning off the S point status notification bit time slot, an abnormality at the S point is notified, and the After the second time division multiplexer is for receiving the notification, the IS
For the DN user / network interface T point, the terminal connected to the ISDN user / network interface S point is "Not Re
ady ", and when the ISDN user / network interface point T deviates from the synchronized state, the ISDN basic interface frame is transmitted from the second time division multiplexer to the first time division multiplexer. The first time-division multiplexing device notifies the abnormality at the T point by turning off the T point status notification bit time slot defined in
The terminal connected to the ISDN user / network interface T point is "Not R" for the DN user / network interface S point.
An ISDN user / network interface connection method via a high-speed digital line, which is performed by notifying that the user is an "eady".