JPS5965331A - Interface device - Google Patents

Abstract

PURPOSE:To obtain an interface device which can simplify the processing at a control part and contribute to simplify the constitution of the control part, by providing a means to convert mutually the signal which is transmitted/ received to and from another system and the signal which is transmitted/received to and from the control part within a system. CONSTITUTION:A signal converting part contains a conversion table and converts mutually the signal transferred to another system and the signal transferred to a control part within a system. In addition, a means is provided to rewrite the contents of the conversion table by an instruction given from the control part. For instance, a preceding status detecting part 4 detects the pulse delivered from a preceding device for an interface device 3 of a telephone exchange 1. Thus a short signal 01 is transmitted to a control part 2 from a signal converting part 9 via a trunk event sensing part 10 in accordance with the conversion table. Then the control signal is fed to a call current supply part 5 and a following status detecting part 6 from the control part 2 via a trunk order receiving part 11 and the part 9. At the same time, the conversion setting order is sent to the part 11 from the part 2 to change the pulse width of a signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an interface device, and more particularly to an interface device that transmits and receives standardized signals between the interface device and a control section.

[Prior art]

As an example of a conventional interface device, a trunk circuit of a telephone exchange shown in FIG. 1 will be explained. In FIG. 1, a telephone exchange 1 is composed of a control section 2 and an interface device 6. As shown in FIG. The interface device 3 is composed of a front status detection section 4, a call current supply section 5, a rear status detection section 5, a trunk status transmission section 7, and an SD/SC access point section 8.

In the above configuration, it is assumed that the control section 2 reads the trunk status sending section 7 at a cycle of 8 ms, and that a pulse of 150 m5 has arrived from another system (not shown). When the preceding status detecting section 4 in the interface device 3 receives a pulse of 150 m5, the trunk status transmitting section continues to display the signal present state for 150 m5. Since the control section 2 reads the state of the trunk status sending section 7 every 8 ms, the control section 2 ends up detecting the signal present 0 state 18 or 19 times in a row. Thereafter, the control section 2 learns that the preceding status detection section 4 has received a pulse of 150 m5. In addition, in the conventional example shown in FIG.
Although the explanation has been made assuming that the preceding status detection unit 4 receives a pulse of 0m5 and the control unit 2 reads the status of the trunk status transmission unit 7 every 8m11, it receives a pulse of other pulse width and reads the status of the trunk status transmission unit 7 every 8m11. Even when reading the status of the trunk status sending unit 7, the following can be said.

That is, in the conventional interface device, the state of the trunk status sending unit 7 cannot be accurately detected unless the cycle at which the control unit 2 reads the trunk status sending unit 2 is less than half the pulse width of the incoming pulse. Can not. Therefore, when the control section 2 receives a short pulse such as an Atayal pulse, it is necessary to read the trunk status sending section 7 in a very short period, which complicates the processing in the control section 2 and also complicates its configuration. There are drawbacks to doing so.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide an interface device that can simplify processing in a control section and is useful for simplifying the configuration of the control section.

[Summary of the invention]

The interface device of the present invention includes a signal conversion unit that includes a conversion table that mutually converts signals exchanged with another system and signals exchanged with a control unit within the system, and a signal conversion unit that converts the contents of the conversion table into instructions from the control unit. It is characterized by having a means for rewriting the information by

[Embodiments of the invention]

The present invention will be described in more detail below with reference to embodiments shown in the accompanying drawings. In FIG. 2, parts that are the same as those of the conventional telephone exchange shown in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted. The difference between FIG. 2 and FIG. 1 is that a signal converter 9, a trunk event transmitter 10, and a trunk order receiver 11 are newly provided. The signal conversion section 9 sends out a smoke signal "01" or a long signal "10" to the control section 2 according to a conversion table as shown in FIG.

Next, the operation of the embodiment shown in FIG. 2 will be explained.

In Fig. 2, the front status detection unit 4 is 150m5
When the signal converter 9 detects a pulse, the signal converter 9 sends a smoke signal "01" to the trunk event sender 10 according to the conversion table shown in FIG.

The control section 2 reads the trunk event sending section 10, detects the smoke signal "01", and recognizes that the interface device 6 has received the smoke signal. That is, according to this embodiment, the cycle at which the control unit 2 reads the trunk event sending unit 10 can be determined independently of the pulse length that the interface device 6 receives. Note that in this embodiment, the signal converter 9
may be composed of an arithmetic circuit, an accumulator, and a memory, or may be composed of a microcomputer and a memory.

FIG. 4 is a block diagram showing an example of the signal conversion section 9 shown in FIG. 2. In the figure, 91 is a signal rise/fall detection circuit, 92 is a signal width counter, 93 is a collation circuit, 94 is an order decoder, and 95 is a table circuit composed of a memory. When the preceding status detecting section 4 shown in FIG. 2 detects a pulse, a detection signal is sent to the signal rising/falling detecting circuit 91 of the signal converting section 9. A signal rise/fall detection circuit 91 detects a pulse change point, and a signal width counter 92 counts the pulse width.

Now, if a 150 mB pulse arrives at the interface device, the collation circuit 96 collates the result of the signal width counter 92 with the table circuit 95, and from the conversion table shown in FIG. 01
”.Then, the signal “01” is the second
The event is sent to the trunk event sending unit 7 shown in the figure. Thereby, the control section 2 in FIG. 2 knows that the interface device 6 has received the smoke signal.

Also, if you want to change the pulse width of the long signal or smoke signal, you can do the following. Now, as an example, consider a case where the pulse width of the smoke signal is changed to 50 m5.

In this case, a conversion setting order indicating that the smoke signal is 50 m5 in FIG. 2 is sent from the control section 2 to the trunk order receiving section 11. As a result, the order decoder 94 shown in FIG. 4 decodes the order and rewrites the contents of the conversion table 95. As a result, when a signal exchanged with another system is a pulse with a pulse width of 50 ms, the pulse is considered to be a smoke signal.

In the above embodiment, the interface device 6 is one
The explanation has been given using an example of receiving a 50 mm pulse and rewriting the contents of the conversion table from a 150 m5 smoke signal to a 50 m5 smoke signal. In the case of signal rewriting, it can also be performed by the same operation as in the above-described embodiment.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, a conversion table between signals exchanged with other systems and signals exchanged with the control device is provided in the interface device, and the conversion table is provided in accordance with instructions from the control unit. By making it possible to rewrite the white paper, the signal transmission and reception between the interface device and the control unit can be standardized without requiring real-time performance, and the configuration of the control unit and the processing in the control unit can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional telephone exchange; FIG. 2 is a block diagram showing an example of a telephone exchange using the interface device of the present invention; FIG. 6 is a diagram showing an example of a conversion table; FIG. 4 is a block diagram showing an example of the signal conversion section shown in FIG. 2. DESCRIPTION OF SYMBOLS 1...Telephone exchange, 2...Control unit, 6...Interface device, 4...Previous status detection unit, 5...
...Talking current supply section, 6...Subsequent status detection section,
7... Trunk status sending section, 8... SN2/
sC access point section, 9... signal conversion section, 10.
... Trunk event sending unit, 11... Trunk order receiving unit, 91... Signal rising/falling detection circuit, 9
2...Signal width counter, 96...Verification circuit, 94.
...Order decoder, 95...Table circuit. Agent Patent Attorney Masami Akimoto

Claims (1)

[Claims] A signal conversion section including a conversion table for mutually converting signals exchanged with another system and signals exchanged with a control section within the system, and means for rewriting the contents of the conversion table according to instructions from the control section. An interface device characterized by: