JPH01151390A - Channel for digital automatic exchange by redundant structure - Google Patents

Abstract

PURPOSE:To obtain the channel of a redundant structure avoided without lowering reliability by connecting selectively two or above interface processing parts out of an (n+k) number of interface processing parts concerning each of an (n) number of interface circuit parts. CONSTITUTION:The title device is equipped with the (n+k) number of interface processing parts and a common switch circuit part having at least the (n) number of connecting terminals corresponding to the (n) number of interface circuit parts. The (n) number of interface circuit parts are connected to the connecting terminals of the common switch part through the (n) number of interface processing parts. When trouble occurs in one of these interface processing parts, a connection switching means connects the interface circuit part to the connecting terminal through the interface processing part which is not out of order. Thus, the high reliability is satisfied and at the same time, the channel of the digital automatic exchange able to adopt the economical redundant structure can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a communication path of a digital automatic switching system with a redundant configuration.

(Prior Art) FIG. 2 is a block diagram of a communication path of a conventional digital exchange. In FIG. 2, the interface circuit section 1.1, .
..., 1.5.5 , ..., 5゜1 2
n L 2 performs signal level conversion, signal demodulation, synchronization, etc., respectively. Interface processing unit 2
,. , 2. 2. 2 ,..., 2 2 4
4. 11 20 21 nO
' nlゝ 10ゝ 114.4 ,...
4 4 is multiplexing/demultiplexing and time 20 21 n
Conversion between Oゝn1, etc. is performed. The common switch circuit units 3° and 31 connect the input end interface processing units 210 to 2□1 and the output side interface processing units 410 to 4nl.

[Problems to be Solved by the Invention] By the way, in order to maintain reliability, the communication path of the conventional digital exchange with the above configuration has two ink face circuit sections 1, to 1n on the input side and an interface circuit section on the output side. 5, ~5
The ink nl 10 face processing portions 2 to 2.4 to 4nl and the common switch circuit portion 3.3□ provided between the ink nl 10 and the common switch circuit portion 3.3 were completely adapted to the duplex configuration.

Therefore, the reliability of the communication path of the digital exchange is sufficiently ensured. However, since the required hardware becomes large, there is a problem that the device becomes large-scale and expensive.

The present invention has been made to solve the above problems,
The purpose of the present invention is to provide a communication path for a digital exchange with a redundant configuration that avoids increasing the scale without reducing reliability.

(Means for Solving the Problems) As a first invention, a communication path of a digital exchange with a redundant configuration according to the present invention includes n interface circuit units, n+k interface processing units, and n interface processing units. A common switch circuit section having at least n connection terminals corresponding to the interface circuit sections, and connection switching means for selectively connecting at least two or more interface processing sections for each of the n interface circuit sections. ing.

Further, as a second invention, a common switch circuit section having n interface circuit sections, n+k interface processing sections, at least n connection terminals corresponding to the n interface circuit sections, For each of the interface circuit units, a connection switching means for selectively connecting at least two or more interface processing units, and a connection switching unit provided between the interface processing unit and the connection terminal, corresponding to the connection by the connection switching unit, and terminal selection means for connecting the interface circuit section to the connection terminal corresponding to the interface circuit section.

(Function) In the first invention, the n interface circuit units are connected to the connection terminal of the common switch circuit unit via the n interface processing units. In this case, if a failure occurs in any of the interface processing units, the connection switching means connects the interface circuit unit to the connection terminal via the interface processing unit that is not in failure.

Further, in the second invention, as in the first invention, n interface circuit units are connected to the connection terminal of the common switch circuit unit via n interface processing units. In this case, if a failure occurs in any of the interface processing units, the connection switching means selects the interface processing unit that is not faulty, and the terminal selection means selects the interface processing unit from which the interface processing unit is connected via the interface processing unit selected by the connection switching means. to the corresponding connection terminal.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a communication path of a digital automatic switching system with a redundant configuration according to an embodiment of the present invention. Interface circuit section 1.1 ,..., 1.1 2
n 5.5 ,..., 5 is level conversion, signal modification 1
2 n Perform tuning and synchronization. Interface circuit section 1-1.
Ink n face processing unit 2.2 connected to 51 to 5o,..., 2.2(.+1),
1 2 n ゛゛ゝ2(n+k) 1 2 nS4
S4, -. 4 to 4(n+1)'..., 4(.

) performs multiplexing/demultiplexing, time conversion, etc. of audio information or data information. Further, the common switch circuit unit 3 connected to the interface processing units 21 to 2(.+k)” 1 to 4(.+k) constitutes a space switch group, and the input side interface processing units 2□ to 2(n+k) )
and the output side interface processing units 4 to 4 are mutually connected. Common 1 (n+k) The switch circuit section 3 has multiple input terminals 11% 12,...
・, l −, 1 (nil) , "', l (n+k) and a plurality of output terminals o1, o2, ..., on" (n+
1),...,0(.+k). These input terminals i■~i(.ya,) and output terminals 01~o(n
+1), input terminals 11 to io and output terminals 01 to
o0 is the interface processing unit 21-2□ and 41-4
These are connected to the interface circuit units 1□ to 1n and 5□ to 5n when no failure occurs in the interface circuits 1□ to 1n.

Note that the common switch circuit section 3 is assumed to be multiplexed.

The communication path of the digital exchange with the above redundant configuration is as follows:
n interface circuit sections 1 on both the input side and the output side
1, 5, and 5o, each of n+k interface processing units 21 to 2(.

) and 4 to 4(n+k) are provided, and the interface circuit units 1 to 1 are controlled by a common control unit (not shown).
and connections 1 between 51 to 5n and interface n to processing units 2 to 2 and 4 to 4 (
n+k) 1 (n+k) changes the continuation.

The interface circuit units 1 to 1.51 to 5nn are connected to a plurality of interface processing units 2 to 2 (n+k) 1 (n+k) according to the value of k, respectively.
．． 4-4 Connection is possible. For example, if K is 1, then the interface circuit units 1 to 1.51 to 5n are two interface processing units 21 to (n+k), respectively.
It is possible to connect with l (n+k). Immediately 2
, 4 to 4 The interface circuit section 11 can be connected to the interface processing sections 2 and 2□, and the interface circuit section 12 can be connected to the interface processing sections 2 and 23.

Note that the interface circuit sections 11-1 on the input side and the interface circuit sections 5□-5 on the output side are linked in opposite ways.

The apparent reliability of the communication path of the digital exchange with the redundant configuration shown in FIG.
(n+k), 1 (n+k) individual 4 to 4 If the failure rate is λ (note, failure rate ζ1o=X F I
T number), . . kCk. ■It can be evaluated with +1 to λ. However, C is different n+kn+k
This is the number of combinations of +1 interface processing units out of k+1 interface processing units.

On the other hand, the reliability of the communication path of the conventional digital exchange shown in Fig. 2 is nλ2 when the interface circuits 1, 1□ are individually controlled (hereinafter referred to as first switching control). , - When switching all at once (hereinafter referred to as second switching control), the value is (nλ)2. Usually n>1,
Since nλ times 1, it becomes nλ2 times (nλ)2. When k is 1, the reliability of the communication path of the digital exchange by the redundant configuration shown in FIG. 1, the reliability of the communication path of the conventional digital exchange by the first switching control, and the reliability of the communication path of the conventional digital exchange by the second switching control The reliability of each digital switch's call path is . . It is evaluated as IC2λ2 ゜λ2 (nλ)2. Therefore, as n increases to 1.2.3, etc., the reliability of each communication path becomes λ2.3λ, 6λ2,... λ2.2λ, 3λ2,... λ2. 4λ, 9λ2,... The reliability of the communication path of the digital exchange with the redundant configuration shown in Fig. 1 is the same as that of the conventional communication path when n is 1, but when n is 2 or more, the reliability of the communication path of the digital exchange with the redundant configuration shown in Fig. 1 is the same as that of the conventional communication path. The reliability of the communication path of conventional digital exchanges and the
The reliability of the communication path of a conventional digital switch due to the switching control of

That is, n λ × C λ <
+1 n+k k+1 holds true for (n λ ) 22.

As described above, the reliability of the communication path of the digital exchange with the redundant configuration shown in FIG. 1 may be worse than the reliability of the communication path of the conventional digital exchange depending on the size of n. However, interface processing units 2 to 2 (n+k)
l (n+k) number 1. 4 to 4 communication paths can be reduced compared to conventional digital exchanges, and miniaturization and cost reduction can be achieved.

Also, when k≧2, If.

k+1 n+kck+lλ λ2×(nλ)2 holds true. Therefore, the communication path of the digital exchange with the redundant configuration shown in FIG. 4～
4 1 (n+k) 1 (n+k)') The communication path has less power and is more reliable than the conventional communication path.

Next, the basic operation of the communication path of the digital exchange with the redundant configuration shown in FIG. 1 will be explained.

Now, each interface circuit section 1.12,...,1
n15.5,...,5 are each interface 1
2 n input processing unit 2.2 ,..., 2.4.42,..., 1
2 n 14
It is assumed that they are connected to each other.

Here, if a failure occurs in the h-th (1≦h≦n) interface processing unit 2h, that interface processing unit 2h is removed. Normally, the input side interface processing section 2h and the output side interface processing section 5h are configured as one unit, so even if a failure occurs on either the input side or the output side, both are eliminated. .

Elimination of the interface processing unit 2h involves removing the interface circuit units 1h” (h+1), . . . , 1 on the input side after the hth input connected to the interface processing units 2.2 (h+1), . . . Interface processing unit 2 (h+1) after the h+1st interface
, 2(h+2)'..., 2 (nil). Similarly, the interface circuit sections 5.5, ..., 5 on the output side are connected to the h (h+l) n interface processing sections 4.4 (h+1) (h+2)ゝ°°°ゝ4 (nil), respectively. Switch.

This connection switching allows the relationship between the input side communication path and the output side communication path to be maintained in the same state as before the failure occurred.

However, when switching at the same time, communication continuity may not be maintained depending on the configuration of the communication path.

For example, the interface processing section may include a time switch. In this case, the communication path has a T-5-T configuration (time switch-space switch-time switch configuration), and the phase difference between the data on the input side and the data on the output side is
It is distributed over 0 to 2 frames. To absorb this i
th ink face circuit section 1. , i-th and tit
th interface processing unit 2. This can be handled by doubly connecting s (i+1) to s (i+1) and 2 and switching them sequentially.

Next, FIG. 3 is a transition diagram illustrating the above-mentioned connection switching in more detail. Note that each interface processing unit 2.
2.2.2.4.4, 4.4 has an input side and an output side integrated,
If a failure occurs on either the input side or the output side, both shall be eliminated.

(a) Each interface circuit section 1 1 . 1.2 13.5.5 and 53 are interface processing units 2.
Assume that a failure occurs in the interface processing unit 2° while the interface processing unit 2° is connected to the interface processing unit 2.2.40.4° and 43, respectively. Interface processing units 22 and 4 at that time
The connection state of ゜ is as shown in Fig. 3(a).

That is, the interface processing section 22 connects the interface processing sections 4.4 and 43 via the common switch circuit section 3.
are connected sequentially. Further, the interface processing section 42 is sequentially connected to the interface processing sections 2.2.degree. and 23 via the common switch circuit section 3.

(b) At this time, the connection state of the interface processing units 23 and 43 that requires connection switching first is shown in FIG.
) as shown. That is, the interface processing section 23 is sequentially connected to the interface processing sections 4.4 and 43 via the common switch circuit section 3. Further, the interface processing section 43 is sequentially connected to the interface processing sections 2.2 and 23 via the common switch circuit section 3.

(C) First, connect the interface circuit section 13 to the interface processing sections 23 and 24 in parallel (see Fig. 3 (
c).

(d) After one frame time or more has elapsed, the interface processing section 23 is switched to the interface processing section 24. That is, the interface processing section 24 is sequentially connected to the interface processing sections 4.4 and 44 via the common switch circuit section 3. Also, the interface processing section 44
The interface processing units 2□ and 2° are doubly connected via the common switch circuit unit 3 (indicated by a dashed line in FIG. 3(d)).

(e) Furthermore, after one frame time or more has elapsed, the interface circuit section 13 and the interface processing section 23 are separated, and the interface processing section 4 and the interface circuit section 53 are connected. Furthermore, the interface processing section 4 and the interface circuit section 53
(See Figure 3(e)).

(r) Perform steps (b) to (e) sequentially for the interface circuit sections 2.2.42 and 41 to separate the interface processing sections 2 and 4□ (see FIG. 3(f)). In this case, the interface processing unit may be shifted in either direction; shifting in both directions will speed up the connection switching.

In FIG. 3, the input side and output side interface processing sections are integrated, but they may be separate. In that case, the connection can be switched in the same way.

Next, FIG. 4 is a block diagram of a communication path of a digital automatic switching system with a redundant configuration according to another embodiment of the present invention. In FIG. 4, parts that perform the same functions as those in FIG. 1 are denoted by the same reference numerals, and the explanation thereof will be omitted.

The common switch circuit section 3゜ has n+1 pieces 1 (n+
1) to the input terminal 'l''2 (n+1) and each interface processing unit 4 to 4 on the output side.
nil) corresponding n+1 output terminals o1, o2, ..., 0(.

+1). Interface processing unit 1
(nil) l (n+1), "In the 5° states 2 to 2, 4 to 4, where the failure force is 5, each interface circuit section 11 to 1 and 5, to 5n is connected to the corresponding input of the common switch circuit section 3. It is connected to the terminals 11-in and the output terminals 01-0. That is, the interface circuit section 1 and the input terminal i
, interface circuit section 1 and input terminal 11...,
Interface circuit section 5 and output terminal 0 are connected.

n n However, the interface processing unit 21 ~ (nil) l
A failure occurs in either (nil) 2 or 4
~4 Thus, when the connection is switched, there will be an interface circuit section that is no longer connected to the corresponding input terminal and output terminal of the common switch circuit section 3o. For example, if a failure occurs in the interface processing section 22, the interface circuit section 12 is connected to the input terminal i3 via the interface processing section 23, and the interface circuit section 13 is connected to the input terminal i4 via the interface processing section 2. become. Note that the same applies to the output side.

Therefore, it becomes necessary for the common switch circuit section 3° to recognize that the interface circuit section is not connected to the corresponding input terminal and output terminal, which makes control difficult.

Therefore, in this embodiment, the interface circuit sections 1 to 1.
51 to 5o and the interface processing units 2 to 2.4□ to 4n are switched, and the input terminals 11 to In corresponding to the interface circuit units 1 and 1n and the interface circuit units 5 to 5 are switched.
and the corresponding output terminals 01 to On so that the n connection state can be maintained.

Therefore, in this embodiment, a plurality of selectors 6.6, ..., 6.7.7□, 12 are provided on the input side and the output side.
n 1 ..., 7 are provided. Selector 6, ~6n and 7□~
7 is the interface circuit section 1, ~1n and 5~5
In response to connection switching between the interface processing units 2□~2nn and 4□~4o, interface circuit units 1~1 and 5□~5n
Input terminal i −i and output terminal 01 to O1l
n. For example, the interface circuit section 12 and the interface processing section 2, and the interface processing section 43 and the interface circuit section 5.
When □ is connected, the interface processing section 2 is connected to the input terminal 12, and the output terminal 0 is connected to the interface processing section 43, respectively.

In this way, selector 6-6.71-7nl
By providing n, switching of the common switch section 3° becomes unnecessary, and control becomes easier.

In addition, selectors 8.8, ..., 8 are 1 of 0 series.
There is also a device that switches between the 2 n common switch section 3 and the 1-system common switch section 31 .

Next, FIG. 5 is a block diagram of a communication path of a digital automatic switching system with a redundant configuration according to another embodiment of the present invention. In FIG. 5, parts that perform the same functions as those in FIGS. 1 and 4 are designated by the same reference numerals, and their explanations will be omitted.

In this embodiment, a failure occurs in one of the interface circuit units 1 to 1.5□ to 5n and interface processing units 2 to 2.41 to 4n, which have a one-to-one correspondence. 4 is also connected to the interface processing unit 2 (nil) (nya 1) for connection switching. According to this embodiment,
Since it is only necessary to switch the connection of only the interface processing unit in which the failure has occurred, it is possible to promptly respond to the failure.

Note that when k is set to a large value, I n is commonly used for all interface circuit units 1 to 1.51 to 5o.
(n+k) (n+1) (n+k) 2 ~ 2 . 4 to 4 may be sufficient, but the whole may be divided into nine blocks, and each block may be provided with m interface processing units. That is, it becomes II-/m.

In this case, one block consisting of n/11 pieces has m
9 units with 9 spare interface processing units.
It's a combination of pieces.

Further, in this embodiment, selectors 6 to 6.71 to 7n are provided as in the embodiment shown in FIG. 4, but these selectors 6 to 6.71 to 7n are
n It is not necessary.

(Effects of the Invention) As explained above, in the first invention, the n interface circuit units are connected to the connection terminal of the common switch circuit unit via the corresponding n interface processing units, and the interface processing unit If a failure occurs in one of the parts, the connection switching means connects the interface circuit part to the connection terminal via the interface processing part that is not malfunctioning, thus achieving high reliability and an economical redundant configuration. This has the effect of providing a communication path for a digital automatic switching system with a redundant configuration.

Further, in the second invention, similarly to the first invention, the n interface circuit sections are connected to the connection terminal of the common switch circuit section via the n interface processing sections, and any one of the interface processing sections When a failure occurs in the connection switching means, the connection switching means selects the interface processing section that is not malfunctioning, and the terminal selection means connects the interface circuit section to the corresponding connection terminal via the interface processing section selected by the connection switching means. Therefore, a highly reliable and economical redundant configuration can be achieved, and there is no need to switch the buses of the common switch section, and a digital automatic switching system communication path with a redundant configuration that is easy to control can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a communication path of a digital automatic switching system with a redundant configuration according to an embodiment of the present invention, FIG. 2 is a block diagram of a communication path of a conventional digital automatic switching system, and FIG. 3(a)
~(f') is a transition diagram illustrating the switching of call paths in a digital automatic exchange using a redundant configuration according to an embodiment of the present invention, and FIGS. 4 and 5 are respectively redundant configurations according to an embodiment of the present invention. FIG. 2 is a block diagram of a communication path of a digital automatic switching system according to the invention. 1. 1. -..., 1.5.5,..., 5n12
n12 is the interface circuit section, 2)251HS252(n+1)Cha1 2
n two, 4 S 4
s =' S 4 ) 4 (n+1)
'...1'-(n+k) l 2
n4(.+k) is the interface processing unit, 3.3
．． 3□ is the common switch circuit section, 6. 6,...,6. 7. 7,...7
．． 1 2 n l
2 n8.8 ,..., 8 is selector 1 2 n 11 % 12 ~ "" in " (n+1) "high i
(n+k) is the input terminal, 01ゝ02ゝ゛°°S0口ゝ0(n+1)%"'%0(
. +k) is the output terminal

Claims (2)

[Claims] (1) A common device having n (n is a positive integer) interface circuit units, n+k (k is a positive integer) interface processing units, and at least n connection terminals corresponding to the n interface circuit units. and a connection switching means for selectively connecting at least two or more interface processing units among the n+k interface processing units for each of the n interface circuit units. A digital automatic switching system communication path with a characteristic redundant configuration. (2) A common device having n (n is a positive integer) interface circuit units, n+k (k is a positive integer) interface processing units, and at least n connection terminals corresponding to the n interface circuit units. a switch circuit section; a connection switching means for selectively connecting at least two or more interface processing sections among the n+k interface processing sections for each of the n interface circuit sections; Terminal selecting means is provided between the connecting terminal and connecting the interface circuit section to the connecting terminal corresponding to the interface circuit section in response to the connection by the switching means. Digital automatic switchboard communication path with redundant configuration.