JPH0344289A - Subscriber line signal processing system - Google Patents

Abstract

PURPOSE:To improve the economy of the hardware by sending and receiving layer 2 management information between a signal equipment and a main controller while relaying a processor of a line concentrator and sending and receiving layer 3 information directly. CONSTITUTION:A line concentrator 5 and processors of a signal device 8, and the line concentrator 5, the signal device 8 and processors of a main controller 13 are interconnected respectively by independent inter-processor buses 11, 12. Then the transmission reception of data link layer (layer 2) management information between the signal device 8 and the main controller 13 is implemented via processors of the line concentrator 5 and the transmission reception of data link layer (layer 2) management information of network layer (layer 3) information is implemented directly. The signal device 8 is used in common, then an irreducible minimum number of signal devices 8 have only to be installed in response to the utility rate of a subscriber line 1 and the economy of the hardware at a large scale is improved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a subscriber line signal processing system, and in particular to a CCITT
Recommendation I Recommendation series concerns the subscriber line signal processing system at the 15DN user network interface.

[Conventional technology]

Conventionally, in this type of subscriber line signal processing system, signaling devices that perform data link layer (layer 2) processing have been attached to subscriber lines in a 1:1 ratio.

An example of a conventional subscriber line signal processing device is shown in FIG. In FIG. 2, a line termination circuit 2 that terminates a subscriber line 21
2, a subscriber line signal line 23 and a line synchronization signal 24 are led into a signaling device 25. The signaling device 25 includes a layer 2 signal processing circuit 26 provided for the subscriber line that performs layer 2 processing of subscriber line signals, and a processor 27 that controls the plurality of layer 2 signal processing circuits 26 and monitors line synchronization signals.
The processor 27 is connected by an inter-processor bus 28 to a processor 30 of a main controller 29 that performs layer 2 management and network (layer 3) processing. Transmission and reception of layer 2 management information and layer 3 information between the signaling device 25 and the main control device 29 is performed via the inter-processor bus 28.

[Problem to be solved by the invention]

In the above-mentioned conventional subscriber line signal processing device, the layer 2 signal processing circuit 26 corresponding to the subscriber line is required in proportion to the increase in the scale of the subscriber line. Furthermore, since there is a limit to the number of layer 2 signal processing circuits 25 that can be controlled by the processor 27 of the signal device 25, more signal devices 25 are required, and the number of connections between the inter-processor bus 28 and the main control device 29 increases. .

However, subscriber lines are not activated all the time and are used at a certain usage rate, depending on the station conditions, so as the number of subscriber lines increases, layer 2 signals that are not used simultaneously This increases the number of processing circuits 26, which has the disadvantage of worsening the economy of hardware, especially in large-scale configurations.

[Means to solve the problem]

The subscriber line signal processing system of the present invention includes a line concentrator including a line concentrator that draws in, concentrates and distributes subscriber line signals, a processor that controls the line concentrator switch and synchronously monitors the subscriber line, and the line concentrator. The line concentrator is composed of a signal device having a processor that draws in the distribution side terminal of the line and performs data link layer (layer 2) processing, and a main control device that has a processor that performs layer 2 management and network layer (layer 3) processing. and the processor of the signal device, the line concentrator, and the signal device.

In a subscriber line signal processing device in which the processors of the main control device are connected by independent inter-processor buses, transmission and reception of layer 2 management information between the signal device and the main control device is carried out by relaying the processor of the line concentrator. The feature is that layer 3 information is transmitted and received directly.

〔Example〕

Next, the present invention will be explained with reference to FIG.

FIG. 1 is a block diagram of a subscriber line signal processing device showing one embodiment of the present invention.

In Figure 1, a line termination circuit (
A subscriber line signal line 3 and a line synchronization signal line 4 are led from the LT (hereinafter referred to as LT) 2 to a line concentrator 5. The line concentrator 5 is a line concentrator switch (hereinafter referred to as 5) that concentrates and distributes the subscriber line signal lines 4.
W) 8, and a processor C and below PRA) 7 which control the SW 6 and monitor line synchronization signals. SW6
The distribution side terminal of is connected to the signal device 8. The signaling device 8 is a layer 2 signal that performs layer 2 processing of one subscriber line signal.
It is composed of a signal processing circuit (hereinafter referred to as 5P) 9 and a processor (hereinafter referred to as FRB) 10 that controls the plurality of signal processing circuits 9. Concentrator 5 PRA 7 and signaling device 80PRBIO
are connected by an inter-processor bus A (hereinafter referred to as BA) 11, and between the PRA 7 of the line concentrator 5 and the processor (hereinafter referred to as CPU) 14 of the main control unit 13 and the PRBI of the signal device 8.
The interprocessor bus B (hereinafter referred to as BB) 12 connects O and the CPU 14 of the main controller 13.

The PRA 7 of the line concentrator 5 monitors the line synchronization signal and connects to one of the vacant SFs 3 of the signaling device 8 by controlling the SW 6 of only the subscriber line that has established synchronization. At the same time, B
The establishment of synchronization of the subscriber line is notified to the main controller 13 via B12. Next, when the SF 3, which pulls in the subscriber line signal line 3 whose line synchronization has been established via the line concentrator 5, detects the establishment of layer 2, PRBIO detects this and connects the line concentrator 5 via the BAll. Transfer to PRA7. At this time, PRBIO uses S as layer 2 link establishment information.
Give the F90 circuit number and transfer. Thereafter, the PRA 7 of the line concentrator 5 transfers the layer 2 link establishment information to the CPU 14 of the main control device 13 via the BB 12. At this time, PRA 7 converts the SF90 circuit number into the line number of subscriber line 1 and transfers it. In this way, layer 2 management information is transmitted and received between the signaling device 8 and the main control device 13.

Since Layer 3 information involves a large amount of data transfer, the above method is inefficient. For this reason, direct data transfer is performed between the signaling device 8 and the main control device 9 via the BB12. Thereafter, the data transfer end notification of the layer 3 information is performed in the same manner as the notification of the layer 2 management information. Furthermore, the memory address of the main control device 13 to which the signaling device 8 can transfer the layer 3 information is notified in advance from the main control device 13 to the signaling device 8 using the same method as for sending and receiving the layer 2 management information. When the PRA 7 of the line concentrator 5 detects the loss of synchronization by monitoring the line synchronization signal, it notifies the main controller 13 of the loss of synchronization of the subscriber line via the inter-processor bus, and also indicates that the subscriber line 1 is not in use. When it is determined that the condition has been reached, the SW6 is controlled, the path between the subscriber line signal line 3 and the SF3 is opened, and the SF3 is made vacant.

〔Effect of the invention〕

As explained above, in the subscriber line signal processing device according to the present invention, by using the signaling devices in common, it is only necessary to install the minimum necessary signal devices depending on the usage rate of the subscriber line, and especially large This has the effect of being excellent in hardware economy when scaled.

In addition, the line number and layer 2
In order to exchange with the signal processing circuit number, the software of the main control unit can centrally exchange the line number of the subscriber line without being aware of the number of the signaling device or the number of the layer 2 signal processing circuit within the signaling device. This has the effect of making management easier because it can be managed.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a subscriber line signal processing device showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional subscriber line signal processing device. 1...Subscriber line, 2...Line termination circuit (LT), 3...Subscriber line signal line, 4...
...Line synchronization signal line, 5... Line concentrator, 6...
... Line concentration switch (SW), 7 ... Processor (PRA), 8 ... Signal device, 9 ...
...Layer 2 signal processing circuit (SP), 10...
- Processor (FRB), 11... Inter-processor node A (BA), 12... Inter-processor node B (BB), 13... Main controller, 1
4... Processor (CPU).

Claims (1)

[Claims] A line concentrator consists of a line concentrator that draws subscriber line signals, concentrates and distributes them, a processor that controls the line concentrate switch and synchronizes and monitors the subscriber lines, and a data link layer (layer 2)
It consists of a signaling device having a processor that performs processing, and a main control device having a processor that performs layer 2 management and network layer (layer 3) processing, and between the line concentrator and the processor of the signal device, and between the line concentrator and the signal In a subscriber line signal processing device in which processors of a device and a main control device are connected by independent inter-processor buses, transmission and reception of layer 2 management information between the signal device and the main control device is relayed through the processor of the line concentrator. and do it,
A subscriber line signal processing system characterized by direct transmission and reception of layer 3 information.