JP3132076B2 - ISDN multiplex transmission system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN multiplex transmission system, and more particularly to a technique for transmitting and receiving a U interface start signal between multiplexers.

[0002]

2. Description of the Related Art A conventional ISDN multiplex transmission system is shown in FIG.
As shown in the figure, the ISDN exchange 8 and the ISDN exchange 8
U interface circuit 1 connected to the U interface 13, a U interface control unit 2 connected to the U interface circuit 1 to control activation and deactivation of the U interface 13, a 3DS0 time slot insertion unit 5 for multiplexing data, and data Switch-side multiplexer 10 including an ISDN channel board 9 having a 3DS0 time slot extractor 6 for separating data, and switch-side multiplexer 10
Is connected via the PCM multiplex transmission line 15 and ISDN
A subscriber multiplexing device 11 including a channel board 9 and an ISDN subscriber terminal 12 connected to the subscriber multiplexing device 11 via a U interface 14 are provided.

[0003]

In this conventional ISDN multiplex transmission system, the U interface 13 and the U side are placed between the exchange side multiplexer 10 and the subscriber side multiplexer 11 before the U interfaces 13 and 14 enter the service state. Interface 1
Since there is no means for transmitting and receiving the start signals of 3 and 14, when the ISDN exchange 8 or the ISDN subscriber terminal 12 requests a start, it is connected to the switch-side multiplexer 10 or the subscriber-side multiplexer 11. Further, both U interfaces 13 and 14 cannot be started from the standby state, and the service cannot be promptly provided.

[0004] It is an object of the present invention to provide an ISDN multiplex transmission system capable of activating a U interface in a multiplexing device and quickly providing a service by eliminating the above-mentioned disadvantages.

[0005]

SUMMARY OF THE INVENTION The present invention provides an ISDN exchange, a first U interface connected to the ISDN exchange, a U interface circuit connected to the U interface, and activation and deactivation of the U interface. Having a U interface control unit for controlling the
Switch side multiplexer including SDN channel board, ISD
A subscriber including the N subscriber terminal and the ISDN channel board, connected to the ISDN subscriber terminal via the second U interface, and connected to the exchange side multiplexer via a PCM multiplex transmission line. In the ISDN multiplexing transmission system provided with a user-side multiplexing device, the ISDN channel board is connected to the interface circuit and monitors a state of the U interface, and the U interface is in a state transition state. An activation signal transmitting unit that generates an activation signal to be transmitted to the partner multiplexing device, a multiplexing unit that inserts the activation signal into a specific bit in the PCM multiplexed signal, and activation from the partner multiplexing device A demultiplexer for receiving a signal and extracting the activation signal from a specific bit in the PCM multiplexed signal, and receiving the extracted activation signal And having a start signal receiving unit for transmitting to the U interface control unit.

Also, in the present invention, the PCM multiplexed signal is composed of a signal obtained by multiplexing a time slot in units of 64 kbps by a time division multiplexing method and a bit indicating a frame, and the specific bit is a PCM multiplexed signal. It is preferable to include the D-channel in the D-channel time slot in the converted signal.

[0007]

The ISDN channel board detects the U interface circuit from the standby state to the training state in response to a start request from an ISDN exchange or an ISDN subscriber terminal, generates a start signal, and generates a start signal to a specific bit in the basic frame. Insert and transmit to the partner multiplexer. The partner multiplexing device extracts the received start signal from the specific bit and controls to start the U interface.

Therefore, the U interface can be activated by the activation signal from the multiplexing device, and prompt service can be provided.

The PCM multiplex signal is composed of a signal obtained by multiplexing a time slot in units of 64 kbps by a time division multiplex method and bits indicating a frame.
The specific bit can be transmitted without any trouble by using an unused spare bit in the D-channel time slot.

[0010]

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

FIG. 1 is a block diagram showing an embodiment of the present invention.

In this embodiment, an ISDN exchange 8 and an IDN
First U interface 1 connected to SDN exchange 8
3, a switch-side multiplexer 10a including an ISDN channel board 9a having a U interface circuit 1 connected to a U interface 13, and an interface controller 2 for controlling activation and deactivation of the U interface;
A DN subscriber terminal 12, a second U interface 14 connected to the ISDN subscriber terminal 12, and an IS interface in which the U interface circuit 1 is connected to the U interface 14.
In an ISDN multiplex transmission system including a DN channel panel 9a and a subscriber multiplex device 11a connected to the exchange multiplex device and a PCM multiplex transmission line 15,
ISDN channel board 9a, which is a feature of the present invention.
Generates a start signal which is connected to the interface circuit 1 and monitors the state of the U interface 13 or 14, and a start signal to be sent to the partner multiplexer when the state of the U interface 13 or 14 changes. An activation signal transmitting section 4, a 3DS0 time slot insertion section 5a as a multiplexing section for inserting the generated activation signal into a specific bit in the PCM multiplexed signal, and receiving an activation signal from the partner multiplexer. A 3DS0 time slot extracting section 6a as a separating section for extracting the starting signal from a specific bit in the PCM multiplexed signal, and a starting signal receiving section 7 for receiving the extracted starting signal and transmitting it to the U interface control section 2 And

FIG. 2 is an explanatory diagram of a PCM multiplex signal used in this embodiment. Here, a 3DS0 system using three time slots in a PCM multiplexed signal as time slots of 2B + D channels is used.

As shown in FIG. 2, the PCM multiplex transmission line 1
5 is composed of 8-bit B1 and B2 channels and an 8-bit D + channel. Bit 1 in the D + channel is a spare bit and is unused, and is set to "1" when not used. Therefore, the start signal is bit 1 of the D + channel.
Is transmitted by inserting "0" into the.

Next, the operation of this embodiment will be described.

In FIG. 1, when the U interface circuit 1 receives a start request from the ISDN exchange 8, the U interface circuit 1 is temporarily put into a training state to shift from a standby state to a service state. U
The interface state monitoring unit 3 detects that the U interface circuit 1 shifts from the standby state to the training state, and transmits it to the activation signal sending unit 4. The start signal sending unit 4 generates a start signal by using the state transition of the U interface circuit 1 from the U interface state monitoring unit 3 as a start request from the ISDN exchange 8, and transmits the start signal to the 3DS0 time slot insertion unit 5a. The 3DS0 time slot insertion section 5a converts the start signal received from the start signal transmission section 4 into the DPM in the stopped PCM multiplex signal without user data.
It is inserted into the spare bit of the channel and transmitted to the subscriber side multiplexer 11a. As a result, a start request from the ISDN exchange 8 is sent as a start signal to the subscriber multiplexer 11.
a.

In the subscriber side multiplexer 11a, 3D
The S0 time slot extraction unit 6a uses the switch-side multiplexer 1
When the 3DS0 time slot extracting unit 6a receives the start signal from the start signal 0a, the 3DS0 time slot extracting unit 6a transmits the received start signal to the start signal receiving unit 7. The start signal receiving unit 7 is provided in the switch-side multiplexer 1
It is determined that there has been an activation request from the ISDN exchange 8 connected to Oa, and the activation signal is transmitted to the U interface control unit 2. U interface control unit 2 receiving the start signal
Issues a U interface start command to the U interface circuit 1, and the U interface circuit 1
Activate the U interface 14 with the subscriber terminal 12.

When an activation request is issued from the ISDN subscriber terminal 12, an activation signal is transmitted through a path opposite to the above-mentioned path, and the U interface 13 is activated.

[0019]

As described above, the present invention provides an ISD
When a start request is issued from the N exchange or the ISDN subscriber terminal, both U interfaces connected to the exchange multiplexer or the subscriber multiplexer can be activated from the standby state, thereby providing quick service. There is.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram for explaining specific bits in a basic frame of a PCM multiplex signal.

FIG. 3 is a block diagram showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 U interface circuit 2 U interface control unit 3 U interface state monitoring unit 4 start signal sending unit 5, 5 a 3 DS0 time slot insertion unit 6, 6 a 3 DS0 time slot extraction unit 7 start signal receiving unit 8 ISDN exchange 9, 9 a ISDN channel board 10, 10a Switch-side multiplexer 11, 11a Subscriber-side multiplexer 12 ISDN subscriber terminal 13, 14 U interface 15 PCM multiplex transmission line

Claims (2)

(57) [Claims] 1. An ISDN exchange, a first U interface connected to the ISDN exchange, a U interface circuit connected to the U interface, and a U interface controller for controlling activation and deactivation of the U interface A switch-side multiplexer including an ISDN channel board, an ISDN subscriber terminal, the switch-side multiplexer including the ISDN channel board, connected to the ISDN subscriber terminal via the second U interface, And a subscriber multiplexing device connected via a PCM multiplexing transmission line, wherein the ISDN channel board is connected to the interface circuit and monitors the state of the U interface. The interface state monitoring unit and the U interface change state A start signal transmitting unit for generating a start signal to be transmitted to the counterpart multiplexing device when the multiplexing unit inserts the starting signal into a specific bit in the PCM multiplexed signal; A separation unit that receives a start signal and extracts the start signal from a specific bit in the PCM multiplex signal;
A wake-up signal receiving unit for receiving the wake-up signal and transmitting the wake-up signal to the U interface control unit. 2. The PCM multiplexed signal comprises a signal obtained by multiplexing a time slot in units of 64 kbps by a time division multiplexing method and bits indicating a frame,
2. The ISDN multiplex transmission system according to claim 1, wherein the specific bits are included in a D-channel time slot in the PCM multiplex signal.