JPS60117991A - Decentralized control exchange system - Google Patents

Abstract

PURPOSE:To attain the reduction of memory capacity needed for the interpretation information and also to give freely numbers to subscribers, by registering an interpretation table of subscribers stored in each subsystem to an individual memory and deciding the store position of a called subscriber based on the interpretation table. CONSTITUTION:Subsystems 1, 2 and 3 are provided. Then 881-1xxx and 881-2xxx are allocated to the system 1; 881-3xxx and 881-4xxx are allocated to the system 2; and 881-5xxx and 881-6xxx are allocated to the system 3 respectively in a standard relation. However this relation is not based on the fixed subscriber numbers and therefore even subscribers having the numbers other than those mentioned above can be stored to subsystems 1-3. Then the store position is informed to the subsystem at the transmission side by the inter-subsystem communication only to the incoming call of the subscriber having no standard relation. Thus a connection is possible between the calling and called subscribers.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a distributed control switching system, and in particular, to a distributed control switching system in which number translation information is distributed to each subsystem. , and relates to an exchange system that allows for liberalization of subscriber number allocation.

[Background of the invention]

As the number of subscribers accommodated in one switching center increases, the number of switching devices becomes smaller, and switching operations become more efficient, there is a tendency for distributed control switching equipment to be adopted. As one of the distributed control switching systems, as shown in FIG. A subsystem (local processor 2 and local memory 5) that controls the communication path switch 12;
There is a distributed switch function type consisting of a subsystem that controls the trunks 13 (local processor 3 and local memory 5) and a subsystem that controls the entire switch (mask processor 4 and local memory 5). .

This system has the advantage of being able to be installed in a geographically dispersed manner, but is less advantageous when accommodating a huge number of subscribers in one station.

On the other hand, as shown in FIG.
2 and local memory 5) has been proposed.

In FIG. 2, for example, from subscriber 10 to another subscriber 1
0', the local processor 1 of the subsystem accommodating the subscriber 10 accesses the local memory δ connected to it and stores the calling subscriber 10 and the called subscriber 10'. by translating each telephone number into a subscriber-accommodating terminal number of the exchange, reading the subsystem number accommodating the called subscriber 10', and connecting via bus 14 to the local processor 2' of the subsystem. , connects the calling subscriber accommodating terminal and the called subscriber accommodating terminal, calls the called subscriber 10', and calls the calling subscriber 1.
Connect to 0. Processing such as failure and billing is handled by the processor 4.

In centrally controlled exchanges, translation information for all subscriber numbers accommodated in the exchange is stored in the storage device, so only one large-capacity storage device is required, but as mentioned above, distributed control type In the exchange, the I! of all subscriber numbers is stored in a local memory 5 connected to each of the number of subsystems. I
Each piece of information must be stored, and a very large amount of memory is required in total. Therefore, changing data as a subscriber moves requires changing the contents of all local memories 5, which is extremely troublesome and complicates processing.

Conventionally, there are the following two methods to solve this problem. That is, (1) a method in which a fixed subscriber number is assigned to each subsystem, and a method in which only 00 number 1i11 translation processing is performed in a dedicated subsystem and all translation information is concentrated there.

In method (1) above, for example, the financial processor 1 in FIG. 2 has telephone subscriber numbers 0001 to 100.
No. 0, and No. 1001 to 200 for local processor 2.
011, local processor 3 has numbers 2001 to 30
Since subscriber numbers are fixedly assigned to each subsystem in order of number 00, etc., each local memory 5 contains translated information regarding subscribers stored in the connected local processor. You only need to memorize it. For example, in FIG. 2, when connecting from the calling subscriber 10 to the called subscriber 10', the local processor 1 refers to the local memory 5 to connect the called subscriber 10'.
When the local processor 2' learns that the called subscriber number is accommodated in the local processor 2' and connects to the local processor 2', the local processor 2' refers to the local memory 5 and translates the called party number into the accommodated terminal number. and connect the calling and called subscriber accommodating terminals to each other.

However, with this method (1), it is not possible to liberalize numbers, which means that even subscribers with fixed subscriber numbers can be assigned arbitrary numbers. The disadvantage is that the number must be changed whenever the person moves. Next, in the method (11) above, if the local processor shown in FIG. 2 is made into a subsystem dedicated to number translation, the calling subscriber 10
When connecting from the called subscriber 10' to the called subscriber 10', the
When the processor 1 first receives the called subscriber number from the subscriber 10, it sends the number to the dedicated local processor 4 via the bus 14, and the local processor refers to the local memory δ to store the called subscriber number. After translating the call subscriber number into an accommodating terminal number and sending the result back to the four-cal processor 1, it is connected to the local processor 2' to connect the two subscribers. In this way, it is possible to liberalize the provision of telephone numbers to subscribers, and the storage device is 1! Since it is only necessary to store number translation information for all subscribers in the local memory 5 connected to the computer processor 4, the amount of communication between the computer processor and the computer processor increases. In addition, the call setup delay time increases, and if the local memory 5 that stores translation information or the processor 4 dedicated to translation processing fails, the entire exchange will go down, resulting in extremely large effects of the failure.

[Purpose of the invention]

The purpose of the present invention is to eliminate these conventional drawbacks, eliminate the need for a dedicated subsystem for number translation, reduce the memory capacity required for translated information, and provide freedom in assigning numbers to subscribers. The object of the present invention is to provide a distributed control switching system that can perform the following tasks.

[Summary of the invention]

In order to achieve the above object, the distributed control switching system of the present invention is provided in a distributed control switching system having a plurality of subsystems each accommodating a plurality of subscribers and each having an individual memory. A translation table for the accommodated subscriber is registered in the individual memory, the calling subsystem determines the receiving subsystem based on the upper digits of the dialed number, and the receiving subsystem uses the lower digits of the dialed number to update the above translation table. The calling subsystem is characterized in that it determines the accommodation location of the called subscriber, and if the called subscriber is not accommodated in the receiving subsystem, notifies the calling subsystem of the subsystem number and accommodation location after moving.

[Embodiments of the invention]

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

FIG. 3 is an explanatory diagram of a distributed control exchange showing one embodiment of the present invention.

In Figure 3, χ has subsystem 1.2.3, and subsystem 1 has 881-I XXX and 881-2X.
XX, subsystem 2 is assigned 881-3XXX and 881-4XXX, subsystem 2 is 881
-5XXX, 881-6XXX are assigned, and this is considered as a standard relationship. Since it is not a fixed subscriber number relationship, subscribers with numbers other than the above numbers also have access to each subsystem 1.2.
．． 3 will be allowed to be accommodated. However, since it is a standard relationship, most of the relationships between subsystems and subscriber numbers as described above are maintained. Only for calls arriving to subscribers with whom there is no standard relationship, communication between the calling subscriber and the called subscriber is established by notifying the calling subsystem of the accommodated location through inter-subsystem communication. Make the connection. If there is no standard relationship between subsystems and subscriber numbers, the number of signal exchanges increases, but these occur when subscribers move between subsystems.
It is not so large that it affects the average call setup delay time.

The configuration shown in FIG. 3 will be explained in further detail.

Local switch subsystems 1 and 2.3 that accommodate terminals such as subscribers 10 and trunks and have functions as independent exchanges, and these subsystems 1.2.3
A tandem switch subsystem 4' is provided to connect these subsystems, and a digital highway 8 connects these subsystems.

As mentioned above, the relationship between subscriber numbers and accommodating subsystems is determined in a standard manner. In FIG. 3, subsystem 1 is 8.
81 stations in the 1000s and 2000s, subsystem 2
are 30006 and 4000, subsystem 3 is 50
Accommodates subscriber numbers in the 006 and 6000 ranges. That is, the subsystem can be determined by the station number and number 4.

Now, when subscriber 10 accommodated in subsystem I makes a call and dials 881-3123, the local
The processor 6 executes a digit analysis program on the local memory δ, and uses the station number and the 4-digit number to determine the subscriber number (DN)-subsystem (
LSS) conversion table is indexed and the terminating subsystem 2 is determined.

The local memory 5 stores, for example, station numbers CDo-D,
) and Φ digits (D, ), and the local processor 6 indexes and expands this table using each number to determine the destination subsystem 2.

For communication from the originating subsystem 1 to the terminating subsystem 2, the IAM recommended by CCI'rTA7 is transferred via the digital link 8, for example. In the subsystem 2, upon receiving the IAM transferred via the digital sink 8, the local processor 6 executes the local me%! Run the incoming call analysis program on J5,
The last four digits (D8-D6) of the subscriber number (DN) determine the accommodation device for the called subscriber 10' from the number translation table in memory. In the number translation table, there is an identification display power t indicating whether or not it is accommodated in the subsystem 2, for example, in the most significant bit, and if there is an accommodation indicator ("l"), it is based on the set accommodation position. Then, call connection processing is performed. If there is no accommodating indication ('0''), the accommodating subsystem number and the accommodating position are returned from the terminating subsystem 2 to the originating subsystem 1, for example as an ACM of CCITT Recommendation 7. , sends an IAM to the contained pz subsystem.

The format of the IAM and ACM signal frames of CCI T TA7 consists of a flag indicating the beginning of the frame, a called subsystem number, an originating subsystem number, and a main text (called subscriber number, called subscriber 1 content subsystem and accommodation). position)
, lj'l check hit, and a flag indicating the end of the frame.

FIG. 4 shows the transmission/reception sequence chart F when the subscriber is not accommodated in the subsystem determined by the upper digit of the subscriber number in FIG. Dla))
When the standard incoming subsystem is determined, JA
The subscriber number is sent to the tandem subsystem (TS) using M(DN).
S) via t-1 over digital link 8 to the standard terminating subsystem (1, SS). The receiving subsystem translates the number and, if the subscriber is accommodated, translates it into an accommodated terminal number and calls the called party. However, if the subscriber has not been accommodated, the subscriber was initially accommodated but has since moved to another subsystem, and the destination subsystem number is registered in the number translation table.
The information is read out, and the ACM takes a shortcut to the accommodation position of the accommodation subsystem via the tandem subsystem (TSS) to the transmission subsystem. The originating subsystem (LSS) then sends the accommodation location in IAM to the accommodation subsystem (LSS). The subsystem that receives the IAM calls the called subscriber connected to the accommodation location (accommodation terminal number) of the content, and connects with the calling subscriber.

If you want to move subscribers across subsystems,
It is only necessary to change the number translation table of the subsystem corresponding to subscriber number C. However, the tables to be changed are not only those of the accommodating subsystem, but also the tables of subsystems that have a trademark-like relationship with the subscriber number.

In the method of the present invention, compared to a method in which each subsystem has translation tables for all subscribers accommodated in the exchange, it is only necessary to have translation tables for the base number (for example, number 4). Therefore, the memory capacity is about 1/10th,
Furthermore, when adding, deleting, or moving subscribers, only the subsystem data is changed, which can reduce maintenance work. Furthermore, in the method of the present invention, C
1. The range of influence is limited to the own subsystem, and the call delay time is short.

〔Effect of the invention〕

As explained above, according to the present invention, there is no need to provide a dedicated subsystem for number translation, the memory capacity required for translation information is small, and moreover, it is possible to freely assign numbers to subscribers. I can do it.

[Brief explanation of drawings]

Figures 1 and 2 are block diagrams of conventional distributed control switching equipment, and Figure 3 shows the configuration of a conventional distributed control switch.
The figure is a configuration diagram of a distributed control switch showing an embodiment of the present invention.
FIG. 4 is a transmission/reception sequence chart when no subscriber is accommodated in the standard termination subsystem in FIG. 3. 1.2,3: Local switch subsystem, 4:
Tandem Switch Subsystem, 5: Local Memory, 6: Local Processor, 7: Time Division Switch, 8: Digital Highway, 10.10': Subscriber Telephone. 4th LSS TSS Standard arrival LSS

Claims (1)

[Claims] α) In a distributed control exchange having a plurality of subsystems each accommodating a plurality of subscribers and each having an individual memory, translation regarding the subscribers accommodated and accommodated in each subsystem. The table is registered in the above-mentioned individual memory, the calling subsystem determines the receiving subsystem based on the upper digits of the dialed number, and the receiving subsystem uses the lower digits of the dialed number to determine the accommodation location of the called party from the above translation table. , and if the subsystem is not accommodated in the destination subsystem, the subsystem number and accommodation location after the movement are notified to the originating subsystem. ■In the translation table, only those with a standard relationship determined by the upper digits of the subsystem and subscriber number are registered, and thereafter, subscribers who have moved between subsystems are also registered. Distributed control switching system 0 according to claim 1