JPH0771320B2 - Redundant configuration of digital automatic switching system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a speech path of a digital automatic exchange having a redundant configuration.

(Prior Art) FIG. 2 is a block diagram of a speech path of a conventional digital exchange. In FIG. 2, the interface circuit units 1 ₁ , 1 ₂ ,
…, 1 _n , 5 ₁ , 5 ₂ ,…, 5 _n are signal level conversions,
It demodulates and synchronizes signals. Interface processor 2 ₁₀ , 2 ₁₁ , 2 ₂₀ , 2 ₂₁ , ..., 2 _n0 , 2 _n1 , 4 ₁₀ , 4 ₁₁ , 4
₂₀ , 4 ₂₁ , ..., 4 _n0 , 4 _n1 perform multiplexing / demultiplexing and time conversion. Common switch circuit section 3 _0, 3 ₁ is to connect the input side of the interface unit 2 ₁₀ to 2 _n1 and output side of the interface processing unit 4 ₁₀ to 4 _n1 each other.

[Problems to be Solved by the Invention] By the way, in order to maintain reliability, the communication path of the conventional digital exchange having the above-described configuration has input interface circuits 1 ₁ to 1 _n and output interface circuit parts. 5 ₁ ~5 _n
Interface processing unit 2 ₁₀ to 2 ⁿ¹ , 4 provided between
₁₀ to 4 ⁿ¹ and the common switch circuit 2 _0, 3 ₁ had become completely redundant configuration.

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

The present invention has been made to solve the above problems,
It is an object of the present invention to provide a speech path of a digital exchange with a redundant configuration that can avoid a large scale without reducing reliability.

(Means for Solving the Problems) A speech path of a digital exchange having a redundant configuration according to the present invention is, as a first invention, n interface circuit sections, n + k interface processing sections, and n + k For each of the common switch circuit section having n + k connection terminals corresponding to the interface processing section and the n interface circuit sections, each of the n + k interface processing sections is connected to at least two or more interface processing sections. Connection switching means for connecting to another interface processing unit.

Further, as a second invention, n interface circuit units, n + k interface processing units, a common switch circuit unit having n + k connection terminals corresponding to the n + k interface processing units, and n interfaces Between each of the circuit units, between the interface processing unit and the connection terminal, a connection switching unit that connects to another interface processing unit that is connected to at least two interface processing units of the n + k interface circuit units. And an interface processing section connected by the connection switching means and a terminal selecting means for connecting a connection terminal corresponding to the interface circuit section connected to the interface processing section.

(Operation) In the first invention, the n interface circuit sections are connected to the connection terminals of the common switch circuit section via the n interface processing sections. In this case, if a failure occurs in any of the interface processing units, the connection switching unit connects the interface circuit unit to the connection terminal via the interface processing unit in which the connection switching unit has not failed.

Further, in the second invention, similarly to the first invention, n interface circuit sections are connected to the connection terminals of the common switch circuit section through the n interface processing sections. In this case, when a failure occurs in any of the interface processing units, the connection switching unit selects an interface processing unit in which no failure occurs, and the terminal selecting unit selects the interface circuit via the interface processing unit selected by the connection switching unit. Part to the corresponding connection terminal.

(Example) Hereinafter, one 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 exchange having a redundant configuration according to an embodiment of the present invention. The interface circuit units 1 ₁ , 1 ₂ , ..., 1 _n , 5 ₁ , 5 ₂ , ..., 5 _n perform level conversion, signal modulation / demodulation, and synchronization. Interface processing units 1 ₁ to 1 _n , 5 _{1 to} 5 _n Interface processing units 2 ₁ , 2 ₂ , ..., 2 _n , 2 _{(n + 1)} , ..., 2 _{(n + k)} , 4 ₁ , 4 ₂ ,
, 4 _n , 4 _{(n + 1)} , ..., 4 _{(n + k)} perform multiplexing / demultiplexing and time conversion of voice information or data information. Further, the common switch circuit unit 3 connected to the interface processing units 2 _{1 to} 2 _{(n + k)} and 4 ₁ to 4 _{(n + k)} constitutes a space switch group, and the input side interface processing unit 2 ₁ ~2 _{(n + k)} and the interconnecting the output side interface processing unit _{4 1 ~4 (n + k)} . The common switch circuit unit 3 has a plurality of input terminals i ₁ , i ₂ ,
, I _n , i _{(n + 1)} , ..., i _{(n + k)} and a plurality of output terminals o ₁ ,
_{o 2, ..., o n,} o (n + 1), ..., and has a o _{(n + k).} Of these input terminals i _{1 to} i _{(n + k)} and output terminals o _{1 to} o _{(n + 1)} ,
The input terminals i _{1 to} i _n and the output terminals o _{1 to} o _n are, when there is no failure in the interface processing units 2 ₁ to 2 _n and 4 ₁ to 4 _n ,
Are those connected to the interface circuit 1 ₁ to 1 _n and 5 ₁ to 5 _n.

The common switch circuit unit 3 is assumed to be multiplexed.

The communication path of the digital exchange with the redundant configuration of the above configuration is
N interface circuit units on both the input and output sides 1 ₁
~ 1 _n and 5 _{1 to} 5 _n are provided with n + k interface processing units 2 ₁ to 2 _{(n + k)} and 4 ₁ to 4 _{(n + k)} , respectively, and a common control unit (not shown) Control, the interface circuit units 1 ₁ to 1 _n and 5 _{1 to} 5 _n and the interface processing units 2 ₁ to 2
_{The connection with (n + k)} and 4 ₁ to 4 _{(n + k)} is changed.

The interface circuit units 1 ₁ to 1 _n and 5 _{1 to} 5 _n each have a plurality of interface processing units 2 ₁ to 2 ₁ depending on the value of k.
Connection with 2 _{(n + k)} and 4 ₁ to 4 _{(n + k)} is possible. For example, K
Is ₁ , the interface circuit units 1 ₁ to 1 _n and 5 _{1 to} 5 _n are two interface processing units 2 ₁ to 2 _{(n + k)} and 4 ₁ to, respectively.
4 _{(n + k)} can be connected. That is, the interface circuit section
1 ₁ is capable of connecting the interface unit 2 ₁ and 2 _2, the interface circuit 1 ₂ is capable of connecting the interface unit 2 ₂ and 2 _3.

The input side interface circuit units 1 ₁ to 1 _n and the output side interface circuit units 5 _{1 to} 5 _n are linked in the opposite manner.

Reliability seen above multiplied the speech path of the digital exchanger according redundant configuration shown in FIG. 1, each interface processing unit 2 ₁ to 2
_{(n + k)} , 4 ₁ to 4 _{(n + k)} Letting λ be the failure rate of each (Note: failure rate 10 ⁻⁹ × FIT number), it can be evaluated by _{n + k} C _{k + 1} λ ^{k + 1} . However, _{n + k} C _{k + 1} is different n + k
K + 1 interfaces from the interface processing unit
This is the number of combinations for which the processing unit is taken.

On the other hand, the reliability of the speech path of the conventional digital exchange shown in FIG. 2 is nλ when controlling the interface circuit units 1 ₁ to 1 _n individually (hereinafter referred to as the first switching control).
² , which is (nλ) ² when collectively switched (hereinafter referred to as the second switching control). Usually n> 1, nλ
Since << 1, nλ ² <(nλ) ² is satisfied. When k is 1, the reliability of the speech path of the digital exchange having the redundant configuration shown in FIG. 1, the reliability of the speech path of the conventional digital exchange by the first switching control, and the conventional by the second switching control The channel reliability of each of the digitized exchanges is evaluated as _{n + 1} C ₂ λ ² nλ ² (nλ) ² . Therefore, as the n is 1, 2, 3, increased ... and so, each reliability of each through such ^{path, λ 2, 3λ 2, 6λ} 2, ... λ 2, 2λ 2, 3λ 2, ... λ ² , 4λ ² , 9λ ² , ... The reliability of the speech path of the digital exchange having the redundant configuration shown in FIG. 1 is not different from the reliability of the conventional speech path when n is 1, but when n is 2 or more, the first switching control is performed. Of the reliability of the communication path of the conventional digital exchange by
It is between the reliability of the speech path of the conventional digital exchange by the switching control.

That is, nλ ² < _{n + k} C _{k + 1} λ ^{k + 1} <(nλ) ² holds.

As described above, the reliability of the speech path of the digital exchange having the redundant configuration shown in FIG. 1 may be worse than the reliability of the speech path of the conventional digital exchange depending on the size of n. However, the interface processing units 2 ₁ to 2 _{(n + k)} , 4 ₁ to
The number of 4 _{(n + k)} can be made smaller than that of the communication path of the conventional digital exchange, and downsizing and cost reduction can be achieved.

When k ≧ 2, Then, _{n + k} C _{k + 1} λ ^{k + 1} <nλ ² <(nλ) ² holds. Thus, the speech path of the digital exchanger according redundant configuration shown in FIG. 1 is the interface processing unit 2 ₁ to 2
_{The number of (n + k)} and 4 ₁ to 4 _{(n + k)} is reduced, and the reliability is better than that of the conventional speech path.

Next, the basic operation of the communication path of the digital exchange having the redundant configuration shown in FIG. 1 will be described. Now, each interface circuit section 1 ₁ , 1 ₂ , ..., 1 _n , 5 ₁ , 5 ₂ , ..., 5 _{n corresponds} to each interface processing section 2 ₁ , 2 ₂ , ..., 2 _n , 4 ₁ , 4 ₂ ,
…, _4n respectively.

If a failure occurs in the h-th (1 ≦ h ≦ n) interface processing unit 2 _h , the interface processing unit 2 _h
Eliminate 2 _h . Normal input side interface processing unit 2 _h
And the output side of the interface unit 4 _h, which is configured in one piece, even if any fault of the input side or the output side is generated, both are to be excluded.

The interface processing unit 2 _h is eliminated by the interface circuit units 1 _h and 1 _{(h + 1)} on the input side after the h-th connected to the interface processing units 2 _h , 2 _{(h + 1)} , ..., 2 _n , respectively. ,
..., 1 _n is the interface processing unit 2 after h + 1
_{(h + 1)} , 2 _{(h + 2)} , ..., 2 _{(n + 1)} are switched respectively. Interface circuit section on output side
Similarly, for 5 _h , 5 _{(h + 1)} , ..., 5 _n , the connection is switched to the interface processing units 4 _{(h + 1)} , 4 _{(h + 2)} , ..., 4 _{(n + 1)} , respectively.

By this connection switching, the relationship between the input side call path and the output side call path can be maintained in the same state as before the failure occurred.

However, when they are switched at the same time, continuity of communication may not be maintained depending on the configuration of the communication path. For example, the interface processing unit may include a time switch. In this case, the speech path has a T-S-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 dispersed in 0 to 2 frames. . In order to absorb this, the i-th interface circuit unit 1 _i is doubly connected to the i-th and i + 1-th interface processing units 2 _i and 2 _{(i + 1)} and sequentially switched.

Next, FIG. 3 is a transition diagram for explaining the connection switching described above in more detail. In addition, each interface processing unit 2 ₁ ,
2 ₂ , 2 ₃ , 2 ₄ , 4 ₁ , 4 ₂ , 4 ₃ , 4 ₄ have an integrated input side and output side, and even if a failure occurs on either the input side or the output side, both Both shall be excluded.

(A) Each interface circuit section 1 ₁ , 1 ₂ , 1 ₃ , 5 ₁ , 5 ₂
And 5 ₃ are connected to the interface processing units 2 ₁ , 2 ₂ , 2 ₃ , 2 ₃ , 4 ₁ , 4 ₂ and 4 ₃ , respectively, it is assumed that the interface processing unit 2 ₂ fails. Connection state of the interface processing unit 2 ₂ and 4 ₂ at that time is as shown in FIG. 3 (a). That is, the interface processing unit
2 ₂ is sequentially connected to the interface processing units 4 ₁ , 4 ₂ and 4 ₃ via the common switch circuit unit 3. Further, the interface processing unit 4 ₂ is sequentially connected to a common switch circuit section 3 interface processor 2 ₁ through 2 ₂ and 2 _3.

(B) In this case, the connection state of the first requires a switching of the connection interface unit 2 _3, and 4 ₃ Figure 3 (b)
As shown in. That is, the interface unit 2 ₃ is sequentially connected to a common switching circuit 3 via the interface section 4 _1, 4 ₂ and 4 _3. Further, the interface unit 4 ₃ interface processor 2 _1, 2 ₂ and 2 ₃ are sequentially connected via a common switch circuit section 3.

(C) first, connected in parallel to the interface circuit 1 ₃ the interface unit 2 ₃ and 2 ₄ (FIG. 3 (c)
reference).

(D) after a lapse of one frame or more hours, switching the interface unit 2 ₃ to the interface section 2 _4. That is, an interface processing unit 2 ₄ via the common switching circuit section 3 sequentially connected to the interface processor 4 _1, 4 ₂ and 4 _4. Further, the interface unit 4 ₄ common switch circuit 3 interface processor 2 ₁ through 2 ₂
Are doubly connected (indicated by an alternate long and short dash line in FIG. 3 (d)).

(E) In addition, after the lapse of one frame or more hours, with disconnects the interface circuit unit 1 ₃ and the interface unit 2 _3, to connect the interface unit 4 ₄ and an interface circuit _3. Additionally, disconnect the interface processing unit 4 ₃ and the interface circuit portion 5 ₃ (see FIG. 3 (e)).

The interface processing units 2 ₂ , 2 ₁ , 4 ₂ and 4 ₁ are sequentially subjected to (b) to (e), and the interface processing units 2 ₂ and
4 ₂ is separated (see Fig. 3 (f)). In this case, either method of shifting the interface processing part is good,
Switching in both directions will speed up connection switching.

Although the input and output interface processing units are integrated in FIG. 3, they may be provided separately. 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 exchange having a redundant configuration according to another embodiment of the present invention. Incidentally, in FIG. 4, parts having the same functions as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.

Common switch circuit section 3 ₀ the input side of each interface processing unit 2 ₁ to 2 _{(n + 1)} corresponding to the n + 1 input terminals i _1, i _2,
..., i _{(n + 1)} and each interface processing unit 4 ₁ on the output side
_{N + 1} output terminals o _{1 to} o ₂ , ..., O corresponding to 4 _{(n + 1)
It has (n + 1)} . Interface processing section 2 ₁ to 2
_{(n + 1), 4 1} ~4 (n + 1) in the absence of a fault in the corresponding input terminals of the interface circuit unit 1 ₁ to 1 _n and 5 ₁ to 5 _n is the common switch circuit 3 ₀ i _{1 to} i _n and output terminals o _{1 to} o _n
It is connected to the. That is, the interface circuit section 1 ₁ and the input terminal i ₁ , and the interface circuit section 1 ₂ and the input terminal i ₁ .
i ₂ , ..., The interface circuit unit 5 _n is connected to the output terminal o _n .

However, the interface processing units 2 ₁ to 2 _{(n + 1)} , 4 ₁ to 4
_{(n + 1)} or the failure has occurred, and switching the connection, so that the corresponding no longer connected to the input terminal and the output terminal interface circuit portion of the common switch circuit 3 ₀ occurs. For example, if a fault occurs in the interface processing unit 2 _2, the input terminal i ₃ interface circuit unit 1 ₂ via the interface unit 2 _2, the interface circuit 1 ₃ the input terminal i via the interface processing section 2 _{4 4} will be connected respectively. The same applies to the output side.

Therefore, the fact that the interface circuit is not connected to the corresponding input and output terminals, it is necessary to recognize the common switch circuit section 3 _0, control is troublesome.

Therefore, in the present embodiment, the interface circuit units 1 ₁ to 1 _n ,
Even _if the connection between 5 _{1 to} 5 _n and the interface processing units 2 ₁ to 2 _n and 4 ₁ to 4 _n is switched, the interface circuit unit 1 ₁ to 1 _n and the corresponding input terminals i _{1 to} i _n and the interface circuit unit 5 ₁ ~
5 _n and so that maintain the connection state between the corresponding output terminal o ₁ ~ O _n.

Therefore, in this embodiment, a plurality of selectors 6 ₁ , 6 ₂ , ..., 6 _n , 7 ₁ , 7 ₂ , ..., 7 _n are provided on the input side and the output side. The selectors 6 _{1 to} 6 _n and 7 _{1 to} 7 _n correspond to connection switching between the interface circuit units 1 ₁ to 1 _n and 5 _{1 to} 5 _n and the interface processing units 2 ₁ to 2 _n and 4 ₁ to 4 _n. , Interface circuit section 1 ₁ to 1 _n
And 5 _{1 to} 5 _n corresponding input terminals i _{1 to} i _n and output terminals o ₁ to
o _Switch to connect to _n . For example, when the interface circuit unit 1 ₂ and the interface processing unit 2 ₃ and the interface processing unit 4 ₃ and the interface circuit unit 6 ₂ are connected, the interface processing unit 2 ₃ and the input terminal
i ₂ and the output terminal o ₂ and interface unit 4 ₃ and the connecting respectively.

Thus, by providing the selector _{6 1 ~6 n, 7 1 ~7} n, becomes unnecessary switching of the common switch unit 3 _0, control is facilitated.

Note that the selectors 8 ₁ , 8 ₂ , ..., 8 _n are common switch units for the 0 system.
3 ₀ and the common switch unit 3 ₁ of the 1-system are switched.

Next, FIG. 5 is a block diagram of a communication path of a digital automatic exchange having a redundant configuration according to another embodiment of the present invention. In FIG. 5, parts having the same functions as those in FIGS. 1 and 4 are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, the interface circuit units 1 ₁ to 1 _n , 5 _{1 to} 5 _n and the interface processing units 2 ₁ to 2 _n , which correspond one-to-one, are used.
Even if any of the interface processing units 4 ₁ to 4 _n fails, the connection is switched to the interface processing units 2 _{(n + 1)} and 4 _{(n + 1)} . According to this embodiment,
Since it suffices to switch the connection only to the interface processing unit in which the failure has occurred, it is possible to promptly deal with the failure.

When k is set to be large, k interface processing units 2 _{(n + 1)} to 2 _{(n + k )} are commonly used for all the interface circuit units 1 ₁ to 1 _n and 5 _{1 to} 5 _n . ₎ , 4 _{(n + 1)} to 4 _{(n + k)} may be provided, but the whole may be divided into 1 blocks and m blocks of interface processing units may be provided in each block. That is, l = k / m. In this case, 1 block having n / l blocks is combined with 1 block having m spare interface processing units.

Further, in the present embodiment is provided with similarly selector 6 ₁ to 6 _n, 7 ₁ to _7-n in the embodiment shown in FIG. 4, the selectors 6 ₁
~6 _n, 7 ₁ ~7 _n may be omitted.

(Effects of the Invention) As described above, in the first aspect of the invention, the connection terminals are connected to the common switch circuit section through the n + k interface processing sections, and if any of the interface processing sections fails. Since the interface circuit unit is connected to the connection terminal through the interface processing unit in which the connection switching unit has not failed, high reliability can be satisfied and at the same time an economical redundant configuration can be obtained as compared with the conventional duplex configuration. The effect that the communication path of the digital automatic exchange with the redundant configuration can be obtained.

Further, in the second invention, as in the first invention, the n interface circuit units are connected to the connection terminals of the common switch circuit unit via the n + k interface processing units, and any one of the interface processing units is connected. When a failure occurs in the connection switching means, the connection switching means is connected to the non-failed interface processing portion, and the terminal selection means is connected to the connection terminal corresponding to the interface circuit portion via the interface processing portion connected by the connection switching means. Therefore, a highly reliable and economical redundant configuration can be obtained compared to the conventional redundant configuration, and it is not necessary to switch the path of the common switch part, and the channel of the digital automatic exchange can be obtained by the redundant configuration that is easy to control. The effect of being able to be played.

[Brief description of drawings]

FIG. 1 is a block diagram of a speech path of a digital automatic exchange having a redundant configuration according to an embodiment of the present invention, FIG. 2 is a block diagram of a speech path of a conventional digital automatic exchange, and FIG. 3 (a).
(F) is a transition diagram for explaining the switching of the communication path of the digital automatic exchange by the redundant configuration according to the embodiment of the present invention,
FIG. 4 and FIG. 5 are block diagrams of a communication path of a digital automatic exchange having a redundant configuration according to an embodiment of the present invention. 1 ₁ , 1 ₂ , ..., 1 _n , 5 ₁ , 5 ₂ , ..., 5 _n are interface circuit parts, 2 ₁ , 2 ₂ , ..., 2 _n , 2 _{(n + 1)} , ..., 2 _{(n + k)} , 4 ₁ , 4 ₂ ,
_{..., 4 n, 4 (n} + 1), ..., 4 (n + k) is the interface processing unit, 3,3 _0, 3 ₁ common switch circuit section, 6 _1, 6 _2, ...,
6 _n , 7 ₁ , 7 ₂ , ..., 7 _n , 8 ₁ , 8 ₂ , ..., 8 _n are selectors i ₁ , i ₂ , ..., i _n , i _{(n + 1)} , ..., i _{(n + k)} is the input terminal, o ₁ ,
o ₂ , ..., o _n , o _{(n + 1)} , ..., o _{(n + k)} are output terminals

Claims (2)

[Claims] 1. An n (n is a positive integer) interface circuit section, an n + k (k is a positive integer) interface processing section, and an n + corresponding to the n + k interface processing section.
For each of the common switch circuit unit having k connection terminals and the n interface circuit units, another interface connected to at least two interface processing units of the n + k interface processing units. A call path of a digital automatic exchange with a redundant configuration characterized by including connection switching means connected to a processing unit. 2. n (n is a positive integer) interface circuit units, n + k (k is a positive integer) interface processing units, and n + corresponding to the n + k interface processing units.
For each of the common switch circuit unit having k connection terminals and the n interface circuit units, another interface connected to at least two interface processing units of the n + k interface circuit units A connection switching unit that is connected to a processing unit; an interface processing unit that is provided between the interface processing unit and the connection terminal and that is connected by connection by the connection switching unit; and the interface processing unit that is connected to the interface processing unit. A communication path of a digital automatic exchange having a redundant configuration, which comprises terminal selection means for connecting to a connection terminal corresponding to an interface circuit section.