Distributed control exchange

Details Distributed control exchange Distributed control exchange

2000-02-10

2003-11-04

Hong, Harry S. (Department: 2642)

Telephonic communications

Centralized switching system

Switching controlled in response to called station...

C379S271000

Reexamination Certificate

active

06643368

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an exchange consisting of packages and/or subsystems that operate individually under a plurality of cooperative processors and share prescribed loads.
2. Description of the Related Art
In recent years, the added value of exchanges that constitute a major component of a public network or a LAN has been increased through application of a high-level information processing technology and transmission technology to it. And such exchanges are now making it possible to provide a variety of communication services.
In many of such exchanges, the hardware and the software have been standardized to flexibly adapt to an increase in the number of terminals to be accommodated and a variety of services to be provided to these terminals as well as to make the maintenance and operation more efficient. And many of such exchanges are configured as a set of packages and subsystems that share prescribed loads and functions under a plurality of interfacing processors.
FIG. 9
is a block diagram showing the configuration of an exchange in which load distribution and functional distribution are made.
In
FIG. 9
, subscriber line correspondence section
101
-
1
to
101
-M are connected to terminals
103
-
11
to
103
-
1
m
, . . . , and
103
-M
1
to
103
-Mm via subscriber lines
102
-
11
to
102
-
1
m
, . . . , and
102
-M
1
to
102
-Mm, respectively, and also connected to corresponding ports of a switch
104
. A control terminal of the switch
104
is connected to a corresponding input/output terminal of a main processor (hereinafter abbreviated as MPR)
105
. Inter-office link correspondence sections
106
-
1
to
106
-N are connected to respective inter-office links
107
-
11
to
107
-
1
n
, . . . , and
107
-N
1
to
107
-Nn that are provided between the exchange and other exchanges (not shown), and also connected to corresponding ports of the switch
104
. The subscriber line correspondence sections
101
-
1
to
101
-M, the MPR
105
, and the inter-office link correspondence sections
106
-
1
to
106
-N are connected to a communication link
108
.
The subscriber line correspondence section
101
-
1
is composed of subscriber line interface sections (LCs)
109
-
11
to
109
-
1
m
that are disposed individually between the subscriber lines
102
-
11
to
102
-
1
m
and corresponding ports of the switch
104
, and a call processing processor (hereinafter abbreviated as CPR)
110
-
1
having a communication port that is connected to the communication link
108
as well as input/output ports (or communication ports) that are connected to input/output terminals of the respective subscriber line interface sections
109
-
11
to
109
-
1
m.
Since the subscriber line correspondence sections
101
-
2
to
101
-M are configured in the same manner as the subscriber line correspondence section
101
-
1
, the components of the former are given reference numerals that are the same as the reference numerals of the corresponding components of the latter and that have first suffixes “2” to “M” and descriptions therefor will be omitted in the following.
The inter-office link correspondence section
106
-
1
is composed of inter-office link interface sections (BWTs)
111
-
11
to
111
-
1
n
that are disposed individually between the inter-office links
107
-
11
to
107
-
1
n
and corresponding ports of the switch
104
, and a call processing processor (hereinafter abbreviated as CPR)
112
-
1
having a communication port that is connected to the communication link
108
as well as I/O ports (or communication ports) that are connected to input/output terminals of the respective inter-office link interface sections
111
-
11
to
111
-
1
n.
Since the inter-office link correspondence sections
106
-
2
to
106
-N are configured in the same manner as the inter-office link correspondence section
106
-
1
, the components of the former are given reference numerals that are the same as the reference numerals of the corresponding components of the latter and that have first suffixes “2” to “N” and descriptions therefor will be omitted in the following.
In the conventional exchange having the configuration described above, as shown in
FIG. 10
, a pilot number selection list
105
L that accommodates in advance, for each multihunting group, a combination of the numbers of terminals to be candidates for a destination party of a call as an object of a pilot number service (i.e., a pilot number service call) among the terminals
103
-
11
to
103
-
1
m
, . . . , and
103
-M
1
to
103
-Mm and that have been generated as a part of office data are allocated in a particular storage area of a main memory of the MPR
105
.
For example, when the terminal
103
-
11
among the terminals
103
-
11
to
103
-
1
m
, . . . , and
103
-M
1
to
103
-Mm originates addressing to the terminal
103
-
21
that belongs to a multihunting group. indicated by a multihunting group identifier “
2
” (indicated as (
1
) in FIG.
11
), the CPR
1101
recognizes the occurrence of the originating call that is corresponding, and captures a number to be dialed that has been set by the terminal
103
-
11
via the subscriber line
102
-
11
.
Then, the CPR
110
-
1
performs code translation on the above number to be dialed, and transmits an originating notice including a result of the code translation to the MPR
105
via the communication link
108
(indicated as (
2
) in FIG.
11
).
Upon recognizing the originating notice, the MPR
105
searches for a record containing, in some field, the same number as the number to be dialed that is included in the originating notice among the records of the pilot number selection list
105
L.
When such a record exists, the MPR
105
identifies the numbers that are contained in the record (for the sake of simplicity, they are assumed here to be numbers that are assigned individually to the terminals
103
-
21
to
103
-
26
), and then identifies the subscriber line correspondence section
101
-
2
having the subscriber line interface sections
109
-
21
to
109
-
26
that are connected to the respective terminals
103
-
21
to
103
-
26
by referring to office data by using these numbers as a key (indicated as (
3
) in FIG.
11
).
Then, the MPR
105
acquires a unique address that is assigned in advance, as a node connected to the communication link
108
, to the CPR
110
-
2
of the subscriber line correspondence section
101
-
2
, and executes the first pilot number service process described as follows.
In the pilot number service process, the MPR
105
transmits, to the CPR
110
-
2
that is indicated by the unique address, via the communication link
108
, a termination processing demand that includes the one number that is listed at the top of the record above-described and means that a termination process described later should be activated (indicated as (
4
) in FIG.
11
).
When the MPR
105
receives a rehunting demand meaning that it is impossible to terminate to the terminal that is assigned such a number in a prescribed period starting from that time point (indicated as (
5
) in FIG.
11
), as long as there are remaining numbers included in the record, the MPR
105
transmits, to the CPR
110
-
2
, a termination processing demand as well including the one following number among the remaining numbers as meaning that a termination process should be activated (indicated as (
6
) in FIG.
11
).
On the other hand, when the CPR
110
-
2
recognizes the termination processing demand described above, it executes a prescribed termination process that is necessary to terminate to the terminal that is connected to the subscriber line that is assigned the number included in the termination processing demand (hereinafter referred to as “candidate for the called terminal”), among the subscriber lines
102
-
21
to
102
-
2
m
that are accommodated via the subscriber line interface sections
109
-
21
to
109
-
2
m
(indicated as (
7
) in FIG.
11
).
In the termination process, the CPR
110
-
2
judges whether termination to the

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