JP2643926B2 - Memory cartridge for telephone exchange device connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone exchange device connection memory cartridge including at least one memory device.

Modern commercial electronic key telephone systems are diversified in various ways such as system sizes, station types, and combinations of functions.
Thus, the user has the choice of an economical specific telephone system that best suits the user's requirements in terms of system size (number of central office lines and number of station sets), type of station set used, and call feature characteristics. It is possible to select
In some processor-controlled key telephone systems, the operation of the system is controlled by a pre-programmed read-only memory (ROM) on a memory card in a common control module.
Is controlled using

The problem is when changing the system size of the current key telephone system, the type or function of the station set used. Usually, changing these systems requires replacing both the hardware and the memory circuit card in the common control module. Unfortunately, replacing hardware and memory circuit cards requires disassembly of common control modules and desired system changes by skilled technicians. Therefore, there is a need for a system configuration that can be easily and economically and reliably changed by a user without disassembling the system parts.

The problem includes a circuit for receiving power from one power source and an external source according to the present invention, wherein the cartridge connects the circuit to the memory device or the voltage of the circuit when the voltage of the circuit exceeds a predetermined value. If the power supply does not exceed the predetermined value, the power source is connected to the memory device.

SUMMARY OF THE INVENTION In accordance with the present invention, a processor-controlled key telephone communication system is configured to accommodate a user-compatible insertable memory cartridge that supplements the processor with program instructions. The user-compatible memory cartridge includes a pre-programmed ROM and a user-programmable RAM, which makes it possible, for example, to easily, economically and reliably change the system size, the type of station set used and the call functions. Become. According to another feature disclosed by the present invention, the memory cartridge comprises
Two control signals are generated which cause the cartridge memory to supplement a portion of the program memory in the system processor. In accordance with another aspect of the present invention, additional user-installed cartridges are provided to provide additional optional features such as retained music, paging, external alarm and power outage transfer functions without disassembly of parts of the system.

BRIEF DESCRIPTION OF THE DRAWINGS A more detailed description of the invention will become more apparent by the illustrative embodiments shown in the drawings, in which: FIG. 1 shows elements of a communication system for describing the invention. FIG. 2 is a simplified block diagram of the communication system of FIG. 1; FIG. 3 is a simplified diagram of a memory cartridge and its connection to a common control module; FIG. 4 is a simplified diagram of a battery protection module of the memory cartridge. FIG. 5 is a simplified diagram of a cartridge providing a holding music and paging function; and FIG. 6 is a simplified diagram of a cartridge providing a power failure transfer and an external alarm function.

DETAILED DESCRIPTION FIG. 1 shows a preferred embodiment of the communication system of the present invention. The communication system of FIG. 1 comprises a telephone line, ST1-ST6, connected to the station set, and two central office lines, CO1 and CO2, respectively connected to the common control module 100 via lines and connectors 105-112. To accommodate.

The common control module 100 includes internal memory and establishes and controls intercommunication and central office line communications involving the station set. The common control module 100 also has three user access cartridge locations for inserting optional cartridges 101, 102, and 103 as shown in FIG. For example, by inserting the user compatible programmable memory cartridge 101 into the common control user 100, it is possible to control the functions of various optional systems. The user compatible hardware cartridge 102 can be used to provide a retained music function by using an externally provided music source connected to the terminal M1 to the system, or provide a system paging function by using the terminal P1. . User compatible hardware cartridge
103 can provide both a power loss transfer function and an alarm function to the system.

FIG. 2 shows a schematic block diagram of a control module 100 for controlling the communication system of FIG. Power supply 230 supplies power to all station sets ST1-ST6 and to all circuit blocks in FIG. The control module 100 includes a microprocessor (CPU) 20 connected to the program cartridge 101 via an address bus 202, a data bus 203, and a control bus 204.
1. Read-only memory (ROM) 205, direct access memory (RAM) 206, protocol handler 207, line circuit controller 208, and decoding logic and network controller (DLNC) 2.
Including 09. Microprocessor (CPU) 201 and address,
Communication between the data and control buses is achieved via input / output (I / O) ports, which are buffered by buffers 210, 211 and 212, respectively. A program command from the ROM 205 and / or the program cartridge 101 controls the CPU 201 by a known method and performs various functions of the communication system. Additional memory RAM 206 is ROM 205
Used to store and access user-created data regarding the performance of desired functions programmed within.

In a preferred embodiment of the control module 100, R
The OM 205 and the RAM 206 provide program memory and temporary memory, respectively, necessary to perform basic system communication functions. Various added or changed communication system functions are programmed in the user compatible program cartridge 101. Program cartridge 101 includes additional ROM and RAM for storing program commands and temporary data for these new various functions. As described below,
By connecting the program cartridge 101 and replacing it with all or a part of the ROM 205, it is possible to realize these new or changed various functions in the communication system.

The microprocessor (CPU) 201 receives a program command including an operation code and an address field from the ROM 205 and / or the programmable memory (program) cartridge 101 via the buses 202-204. Using these program commands, the CPU 201 controls the communication connection between the station sets ST1-ST6 and / or between the station sets and the central office lines CO1 and CO2. In response to these program commands, CPU201
Performs read / write of memory, decoding of data and logical operation thereof, and outputs control commands and data to various circuit modules (207-209) via buses 202-204.

One circuit module is the decode logic and network controller (DLNC) 209, which provides various system timers, programmable tone generators, and network control logic in well-known fashion to send signals for selecting and controlling switch connections. The circuit DLNC 209 also generates a four-level interrupt signal INT and a normal timer overflow signal RESET for the CPU. Finally, the DLNC 209 controls address select and control signals (213-21) for controlling the operation of other circuit modules.
7) Provide various decoding logics for generating

The switch 228 operates in response to the control signal 215 from the DLNC 209 to establish a voice connection between the station sets ST1 to ST6 and / or an arbitrary station set and a CO line or CO1 to CO2.
Switch 228 can be implemented using standard well-known two-way bi-directional intersections.

Tone shaping circuit 222 in response to signal 213 from DLNC 209
Generates a tone required for the operation of various system functions using a known circuit, and outputs the tone to the station sets ST1-ST6.

In response to a device control signal 216 from DLNC 209, a line circuit controller (LCC) 208 decodes the control signal from CPU 201 and energizes line circuit 224 via signal bus 229. The line circuit 224 detects the call of the CO line, senses the current of the CO line,
O-line de-energization, multi-frequency signaling and rotation pulse output, transmission gain, switches forming a switching network 22
Provides standard line circuit features such as isolation from eight potential faults and / or longitudinal noise on the CO line.

In response to control signal 217, protocol handler (PH) 2
07 performs I / O station set communication via the protocol interface 223. The operation of PH207 is a control signal from DLNC209.
It is controlled by the CPU 201 via an address bus 202, a data bus 203, and a control bus 204 in addition to 217. The data to be transmitted to the connected station set, ST1-ST6, is CP
It is transferred to the memory in PH207 by U201. Similarly,
Data from the connected station is read from the PH207 memory by the CPU 201. Messages are sent periodically to each station under the control of PH207 during an operation called the "scan" function. These messages are formatted by the PH 207 into the format required for communication between the station set and the common control module 100. Protocol interface 223 provides the actual interface between protocol handler 207 and central office lines 105-110.

Each station's scan acts as a poll for that station, which responds with one message. Scan transmission between the PH 207 and each station proceeds in order until all stations are scanned, and when the last station is scanned, the scanning cycle is completed. Data transfer between CPU 201 and PH 207 occurs before one scan cycle is completed and the next scan cycle begins.
DLNC then sends an interrupt signal INT to CPU 201 via lead 236.
I will provide a. Upon receiving the signal INT, the microprocessor CPU 201 completes the data exchange with the PH 207.

In response to control signals 214 from DLNC 209, interface 227 couples signals between option cartridges 102 and 103 and switch 228 via buses 231 and 232, respectively. For example, when the line is placed on hold, control signal 214 couples externally provided music to the hold line. This music is received on the lead M1 of the cartridge 102, and is sent to the held line via the connector 233, the bus 231, the interface 227, and the switch 228. Similarly, during the paging mode, signals from the pager's line are coupled to lead P1 of cartridge 102 via switch 228 and interface 227.

Switch panel in response to control signal 218 from DLNC 209
The contents of 225 are output to the data bus 203. Switch panel 225 contains user input information on system options,
For example, pulse output or multi-frequency tone signaling as well as outgoing dialing constraints or station read priority. A control signal 219 from the DLNC 209 activates a light emitting diode (LED) in the display 226 to indicate a particular operating condition of the system.

FIG. 3 shows a user compatible program cartridge 101 connected to the common control module 100. If the user needs a new or improved system communication function, a new system function can be provided by inserting another program cartridge 101 into the common control module 100. This program cartridge 10
With one user compatibility, it is possible to easily and safely add or change system functions economically without disassembling a part of the system.

The program cartridge 101 is configured as an external housing with an enclosed printed circuit board (not shown) containing the circuitry shown in FIG. The printed wiring board edge 308 is configured to be inserted into the connector 235 of the receptor device mounted on the common control module 100 by a known method. The leads in connector 235 include address bus 202, data bus 203, DC power (+ 5V) 317, leads DA and DB. The program cartridge 101 has a ROM bank 301 and RAM.
It includes two groups of standard memory devices, identified as bank 302, which are selected for reading by decoder 303. RAM 302 is selectively written by using write enable circuit 304. An address bus 202 and a control bus 204 are connected to a decoder 303, and a ROM bank 301 and a RAM bank 3 are connected.
Provide access to 02. Data bus 203 is a ROM bank
301 and the RAM bank 302.

Power lead 317 provides DC power to ROM bank 301, RAM bank 302, decoder 303, and write enable circuit 304. In this example, the information in RAM bank 302 includes customer input information such as a telephone designation table. To prevent a situation where the customer must re-enter this information, the data in RAM bank 302 is protected from inadvertent RAM write commands that could corrupt the data in RAM. Usually, this careless write command is generated in a noise or software abnormal state. In a preferred embodiment, write enable circuit 304 includes a RAM memory write protection circuit.

A rechargeable backup battery 305 is provided because the RAM bank 302 is a volatile memory that always requires power to prevent loss of information in the memory. As will be described in more detail below, the rechargeable battery 305 is connected to the RAM bank 302 via the power protection circuit 306 and the lead 316 when a power interruption occurs on the lead 317 or when the cartridge 101 is de-energized from the common control module 100. Provide temporary power.

Further, as shown in FIG. 3, the common control module 100
In a preferred embodiment, ROM 205 includes 48K words of memory. In FIG. 3, the ROM 205 is 2
ROMs, ROM 312 and ROM 315. When the program cartridge 101 is inserted into the common control module 100, the start signal to all or a part of the ROM 205 memory is cut off and replaced with the ROM 301 of the program cartridge 101. (Including transistors 311 and 314)
Two circuits for connecting or disconnecting the activation signal to the memory are connected to the ROM 312 in response to the signal leads DA and DB, respectively.
And the connection of + 5V power to the ROM 315. switch
When 318 is connected to lead 317, a disconnection signal, which is a + 5V DC signal, is sent to lead DA. This +5 VDC signal causes the register 310 and the bias transistor 311 to be non-conductive. If transistor 311 is non-conductive, this is R
The start signal to the ROM 312 of the OM device 205, that is, the + 5V DC power is cut off. For example, ROM312 has a total of 48K consisting of 16K each.
ROM device. When switch 318 is not connected to + 5V on lead 317, transistor 311 is "on" and the activation signal + 5V DC power activates ROM 312 operation. In such a state, the ROM 301 of the program cartridge 101 does not replace the ROM 312.

Similarly, when the switch 307 is connected to the lead 317, a disconnection signal that is a +5 V DC signal is generated on the lead DB. This +5 VDC signal causes a non-conductive state between the register 313 and the bias transistor 314. If transistor 314 is non-conductive, it will cut off the + 5V DC power supplied to ROM 315. In the above example, ROM315
This is a ROM device of a total of 48K including a maximum of 35K of the ROM device 205. Therefore, depending on the positions of the switches 307 and 318, the program cartridge 101
Replaces ROM 312 and / or ROM 315 of device 205.

In the present invention, a program cartridge is further provided.
By operating a switch on the common control module 100 with a physical device on 101, a disconnection signal can be generated for the leads DA and DB. Furthermore, consideration has been given that signals other than + 5V power can be used to activate the ROMs 312 and 315. For example, ROM312 and
A desired result can also be obtained by disconnecting the read lead to 315 or the connection of the data bus 203.
The replacement techniques disclosed herein are independent of both the amount of ROM deactivated from the common control module 100 and the amount replaced by the program cartridge 101 by the ROM.
The RAM located in the common control module 100 can be supplemented by the RAM located in the program cartridge 101. The amount of ROM and / or RAM replaced or added to the system depends on the amount of program instructions (ROM) and temporary memory (RAM) needed to implement the various functions provided by program cartridge 101. .

In a preferred embodiment of the invention, sufficient ROM 205 and RAM 206 (second
Figure) is provided to the communication system. Therefore, the program cartridge 101 is not required in such a basic system. If no program cartridge 101 is connected to the common control module 100, the read DA
And DB are both open and transistors 311 and 314
Activates the operation of ROMs 312 and 315.

Since the RAM bank 302 always needs a power source to prevent loss of information in its memory, the power protection circuit 306 is provided with rechargeable battery backup power when + 5V power is interrupted. But battery 30
It is necessary to prevent 5 from discharging below a predetermined level to prevent it from entering an overdischarge state. If battery 305
When the battery reaches the overdischarge level, it cannot be charged and the cartridge 101 must be disassembled or the cartridge must be replaced and replaced. In the present invention, disassembly or replacement of the cartridge 101 is not required because the power protection circuit 306 provides both battery backup and battery protection.

FIG. 4 is a simplified diagram of the power protection circuit 306 included in the program cartridge 101. When the program circuit 101 is connected to the common control module 100, the + 5V power on lead 317 will cause the diode 401, register 402 and lead 31
Power is supplied to the RAM bank 302 via 6. at the same time,
The current through diode 403 and resistor 404 charges battery 305 until the rechargeable battery 305 (nickel cadmium battery or similar battery) voltage reaches full charge (+ 5V minus the voltage drop in diode 403). Then, the flow of current through the diode 403 and the resistor 404 stops. + On lead 317
The voltage on lead 316 when 5V is present is approximately 4.8 volts. It also appears between the voltage or capacitor 408 on the lead 316 and the gate G of the field effect transistor (FET) 408. Since the voltage on gate G is greater than +1.5 to +3.0 volts, FET 407 conducts and conducts current between drain D and source S. Thus, the current flows from the emitter-base junction of the transistor 405 to the resistor 406, the drain D,
Flows to source S and ground. Transistor 405 is turned on and current flows to emitter E, collector C and lead 316. If the +5 VDC power on lead 317 is interrupted, or if the program cartridge is de-energized from common control module 100, no current flows through diodes 401 and 403. But RAM bank 30
2 is supplied with current from the battery 305 via the emitter-collector path of the transistor 405. When supplying current, the battery 305 gradually discharges and its output voltage decreases. When the voltage between batteries 305 drops below a predetermined value, battery 305 becomes unchargeable when +5 volts is reconnected to lead 317. Damage resulting from such a condition is permanent and requires replacement of the battery 305. To prevent such an overdischarge state, when the voltage at the gate G falls from +1.5 to +3 V or less, the FET 407 is turned off. When the FET 407 is turned off, the transistor 405 is also turned off, and the current flow to the RAM bank 302 is interrupted. At this point, the battery 305 is de-energized from the RAM bank 302 and thus protected from reaching an over-discharge condition. Of course, when the DC voltage is removed, the contents of the volatile memory of the RAM bank 302 are lost. When +5 VDC power is again delivered on lead 317, battery 305 is charged via diode 403 and resistor 404.

FIG. 5 shows a schematic diagram of the optional holding music / paging cartridge 102. Cartridge 102 is a user compatible hardware cartridge that controls the connection of externally held music and paging circuitry to the system. Cartridge 102
Includes an outer housing with a mounting circuit board (not shown) containing the circuit of FIG. At the edge of the printed wiring board 500, the collector 233 of the cartridge receptor of the interface 227 is inserted. When a station or line is put on hold,
The music received from the customer music source M1 is coupled to the MOH of the interface 227 via the isolation transformer 501, the well-known overvoltage protection and high-pass filter circuit 502, and the holding music volume controller 503.
Coupled to the lead. This music is shared control module 10
It is distributed to the holding line via the switch 228 of 0. Further, while the paging mode is not activated, the music is sent as background music to the paging lead P1 via the background music volume controller 504, the break contact K1A and the transformer 505.

The paging mode is started when the flip-flop 506 is set in response to a paging mode setting signal (SPM) from the interface 227. During paging mode, the output of flip-flop 506 is at ground potential. Switch 507 has a tone signaling location 508 and a non-tone signaling location 509. In the paging mode, when switch 507 is set to position 508, the ground potential on output Q is connected to buffer amplifier 510, which relay K1 and well-known click suppression circuit 51
Work one. Click suppression circuit 511 is paging read
Prevents audible clicks from being output to P1. diode
D1 connects between relays K1 and + V and the output of amplifier 511 to provide surge protection for amplifier 510.

When the relay K1 operates, the make contact K1B closes and the break contact opens. Accordingly, the music provided via relay M1 is interrupted, and the paging signal from lead PAGE of interface 227 is applied to page line P1 via transformer 505.
Sent to A tone signal is received before each voice paging signal received via lead PAGE. Switch 50
When 7 is in tone position 508, relay K1 is activated immediately and the tone signal on lead PAGE is output to a paging system (not shown) via lead P1.

If tone signaling is not required prior to voice paging, switch 507 is set to non-tone position 509. In the non-tone position, a single shot 512 and an OR gate 513 are connected to the output lead Q of flip-flop 506. Single shot 512 provides a logic one output for a predetermined period (T seconds) in response to the ground potential input received from output lead Q. The output of a single shot 512 is a 2-input OR gate 5
13 and output logic 1 from OR gate 513 for about T seconds. Logic 1 output of OR gate 513 is amplifier 5
Connect to 10 and suppress the operation of relay K1 for about T seconds. relay
When operation of K1 is suppressed, make contact K1B remains open, preventing tone signals occurring during the first T seconds of the paging mode from reaching transformer 505 and page lead P1.

When T seconds have elapsed, both inputs to OR gate 513 go to logic zero, ground potential, and amplifier 510 activates relay K1. Therefore, T seconds after the page mode is established, the make contact is closed and the audio signal is coupled to the page lead P1.

FIG. 6 shows a simplified diagram of the optional external alarm and power outage transfer cartridge 103. The cartridge 103 is a user compatible cartridge and controls connection of an external alarm and power failure transfer circuit to the system. Cartridge 103 includes an outer housing with a mounted printed wiring board (not shown) containing the circuitry shown in FIG. The edge of the printed wiring board 600 is inserted into the connector 234 of the cartridge receptor of the control module 100.

When a predetermined alarm condition occurs, an alarm setting signal AS is generated in the interface 227, whereby the flip-flop 601 is set. When the flip-flop 601 is operated, the ground potential Q is output and the relay K2 is operated. Diode D2 protects flip-flop 601 from the transient voltage generated by relay K2. When the relay K2 operates, the make contact K2A is closed, and the
48VDC is provided between leads A1 to notify the customer of the alarm condition. When the alarm is released, the reset signal AR from the interface 227 releases the flip-flop 601 and removes the -48 VDC voltage between the leads A1. In addition to this, commercial AC
In the event of a power outage, the -48 volts supplied from interface 227 via connector 234 is typically lost, resulting in relay K3 being disconnected. When relay K3 is released,
Break contacts K3A and K3B are telephone pair S1 and interface
A standard telephone office set (not shown) is connected via 227 to the central office line CO1. Similarly, break contacts K3C and K3D
Connects another set of central offices (not shown) to the central office line CO2 via telephone pair S2 and interface 227.

In the event of a commercial AC power failure, the common controller 100 and station sets ST1-ST6 do not have the power required for normal operation and thus operate from -48 volts provided through the central office lines CO1 and CO2. Thus, limited telephone service is provided by a standard central office set connected to leads S1 and S2.

The preceding description is merely illustrative of the invention. Other circuits and embodiments may be implemented by those skilled in the art without departing from the spirit and scope of the invention.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Godon Alan Meyer United States 07747 New Jersey Matawan Onyx Place 91 (72) Inventor Sylverio Vincent Gillon United States 07748 New Jersey -C. Middletown Braveins Av Any-53 (72) Inventor Dadney Harbour More Timer-United States 07760 New Jersey C. Ramson Holly Tree Lane 21 (56) References JP-A-58-111468 (JP, A) JP-A-53-144213 (JP, A) JP-A-55-55624 (JP, A) JP-A-57-114466 (JP, U) 1979-589029 (JP, U) 19757-225 (JP, U)

Claims (5)

(57) [Claims] 1. A control module connected to a plurality of communication lines, wherein the control module is connected to a main memory whose connection is controlled by an activation signal, and performs communication between the communication lines under a program command stored in the main memory. A memory cartridge connected to a control module operable to control and replacing all or part of the main memory, a memory means for storing program instructions for realizing various new or changed functions of the control module; Means for generating a first disconnection signal for disconnecting the activation signal to the main memory. 2. The memory cartridge according to claim 1, further comprising: a power receiving unit, a power consuming volatile memory device, a battery, the battery, a power terminal of the memory device, and the power receiving device. Means connected to the means, when the voltage at the power receiving means exceeds a predetermined voltage, connecting the power receiving means to the memory device, disconnecting the battery from the memory device, and Means for disconnecting the power receiving means from the memory device if the voltage at the means does not exceed the predetermined voltage, and connecting the battery to the memory device. 3. The memory cartridge according to claim 1, further comprising: means for generating a second disconnection signal for disconnecting an activation signal to said main memory; and said first disconnection signal. Or means for switching any of the second disconnection signals to the control module. 4. The memory cartridge according to claim 1, wherein said cartridge is configured to provide an activation signal when it is inserted into said control module. cartridge. 5. The memory cartridge according to claim 1, wherein the cartridge is configured to provide an external circuit to the control module.