Toa EXES-6000 Operating And Troubleshooting
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Toa EXES-6000 Operating And Troubleshooting

Toa exes-6000 intercom system: user guide
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TOA
EXES-6000
SYSTEM
TOA Corporation
KOBE, JAPAN

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Summary of Contents for Toa EXES-6000

  • Page 1 EXES-6000 SYSTEM TOA Corporation KOBE, JAPAN...
  • Page 2 PREFACE This booklet readily explains a working principle of the EXES-6000 system from a standpoint of the entire system and so, does not refer to the details of the circuits, CPU's or IC's. It is compiled with an emphasis placed on the descriptions of audio and dial signal flows that are a base of the system, and the timing of their relative switches, which are explained by using block diagrams of actual circuits.

  • Page 3: Table Of Contents

    2. Performance Comparison between New and Old Voice Switches 2-1. Voice Switch Features of Duplex Line Unit for the EXES-5000, the EXES-1000 and the EX-16 2-2. Voice Switch Features of Duplex Link Unit for the EXES-6000 IV. PAGING SIGNAL FLOW 1.

  • Page 4: Basic Items

    1-2. Voice Switch To make the hands-free half-duplex conversation possible by preventing occurrence of such feedback problem, Toa EXES-6000 system uses voice switch in its exchange that is able to detect signal strength information from both lines and to automatically select the speech line of higher signal level, while disconnecting another speech line of the lower signal level.

  • Page 5: Concept Of Speech Link

    EXES-6000 system with 128 stations where the required number of switches totals –...

  • Page 6: Space Division And Time Division Methods

    2-3. Space Division and Time Division Methods a. Space Division Method Fig.5 Space Division Method (8 lines/2 links) The method employed in Toa EX-16 system. With this method, the system can do with the relatively small number of switches if it is the small system.

  • Page 7: Principle Of Time Division

    3. Principle of Time Division 3-1. PAM (Pulse Amplitude Modulation) Signal In order to convert an analog signal such as speech into a pulse stream, a circuit must sample it at periodic intervals. The amplitude of the pulses sampled is proportional to the amplitude of the 3-2.

  • Page 8: Demodulation Of Pam Signal

    3-3. Demodulation of PAM Signal Both holding capacitor and lowpass filter are necessary to demodulate the PAM signal. (1) PAM signal potential of Fig. 9-(1) at each sampling instant is held with the holding capacitor. (2) Sampling pulse elements contained in the waveforms of Fig.

  • Page 9: Principle Of Time Division Multiplex

    4. Principle of Time Division Multiplex 4-1. Time Division Multiplex The time division multiplex is a method to divide various signals by time and to place such ti- 4-2. Access to Time Division Multiplex In Fig. 11-(a) at the right hand side, consider just how many lines are needed to transmit 4 different signals A, B, C and D to the outputs 1, 2, 3 and 4, respectively.
  • Page 10 (2) Another connection example like one in Fig. 11-(c) can be considered when you wish to develop the previous connection in order to reduce the number of lines. The idea of this connection is that switches 1 and 2 are synchronized with each other, through which signals A to D are transmitted in this order to each corresponding output.

  • Page 11: Time Division Exchange

    4-3. Time Division Exchange Fig.13 Time Division Exchange Block Diagram (4 lines/2 links) Shown below is the timing of each analog switch Fig. 13. (Voice signal flow: Mic A Speaker C, when a conversation is being made between Mic C Speaker A) stations A and C using LINK No.1 in the above Fig.14 Timing Diagram...
  • Page 12 Here we show the voice signal flow of Fig. 13 where stations A and B are conversing with each other. For timing of each switch, refer to Fig. 14. — Timing "1" — (1) Switches Tx and Ry close at the timing "1" among the timings of Ty (Marked in red in the Figs.

  • Page 13: Voice Signal And Dial Signal Flows

    II. VOICE SIGNAL AND DIAL SIGNAL FLOWS 1. Voice Signal Flow Fig. 15 Voice Signal Flow — 10 —...
  • Page 14 DL unit through highway HW-T (in link No. 1, b) The timing chart below shows actual switch timings and PAM signal wave forms on HW-T and HW-R in EXES-6000 systems when the Fig. 16 Timing Chart in Conversation Between cross-connection is made between Ty...

  • Page 15: Dial Signal Flow

    2. Dial Signal Flow Station dialing operations cause the pulse stream corresponding to each key depressed to be generated in the dial pulse generator, which amplitude-modulates the FM carrier plitude-modulated signal is sent out to the LM Fig. 17 Dial Signal Flow unit of the exchange.

  • Page 16: Dial Signal Receiving System

    3. Dial Signal Receiving System Let's assume that 202 (station number) is dialed at station No. 200. The dial pulse detector located in the LM unit and intended for station No. 200, as explained just before, delivers the following dial pulses to the output.
  • Page 17 The serial pulse streams that went into IP No. 0 are transmitted to both the OC unit and HC unit after being converted into parallel codes. In the HC unit, the data from the CP unit is written into both the line memory and signal memory accord- ing to the address specified by the OC unit.

  • Page 19: Line Memory And Signal Memory

    4. Line Memory and Signal Memory Line memory is a 32 words by 8 bits memory formed from 4 RAM's of 16 words by 4 bits. In this line memory, station numbers of the stations engaged in coversations are written into the addresses that correspond to the link to be used in the order of a calling side (T) and called side (R).
  • Page 20 Contents of the line memory when stations No. 200 and No. 202 are engaged in a conversation using link No. 1. Table of Service Signal Tones Calling tone Privacy tone Busy tone Dial tone Zone paging preannounce- ment tone All-call paging nouncement tone Priority...

  • Page 21: Voice Switch Circuit

    It is already mentioned voice switch is necessary for the hands-free conversation. Here, we explain the principle of the voice switch circuit used in the EXES-6000 system. The voice switch circuit mentioned here is an improved version of one that is used in the EXES-5000 system.

  • Page 22: Operation Principle Of The Voice Switch Circuit 20~23

    A to be still kept higher at the comparator but also the status of (3) above to be maintained. * The EXES-6000 system uses FET's for the switches SW(A) and (B). This makes transient response at switching longer than that of the EXES-5000.

  • Page 23: Handset To Hands-Free Mode

    1-2. Handset to Hands-free Mode Assume that in Fig. 23, station A in the handset mode is connected to station B in the hands-free mode. (1) A 40Hz handset mode signal and voice signal from station A are transmitted to the DL unit via the LM unit and HW-T.
  • Page 24 At last, both VOICE SWITCHES (A) and (B) close, providing full duplex conversation. In this event, SIDE TONE CIRCUIT is not activated. The side tone circuit is a circuit that enables a talker using a station handset to hear his own voice through a handset ear speaker.

  • Page 25: Handset To Handset Mode

    1-3. Handset to Handset Mode Assume that in Fig. 23, both stations A and B are in the handset mode and connected. (1) A 40Hz handset mode signal and voice signal are transmitted from the both stations to the DL unit via the LM unit and HW-T. Both VOICE SWITCHES (A) and (B) close, provid- ing full duplex conversation.

  • Page 26: Performance Comparison Between New And Old Voice Switches

    Usable under up to 60-phon noise level 2-2. Voice Switch Features of Duplex Link Unit (DL-62/62A) for the EXES-6000 Improved voice signal detection circuit assures high performance against pulsive noise and malfunction due to acoustic feedback.

  • Page 27: Paging Signal Flow

    In the case of normal conversation, the speech path system is formed by stations, LM unit and DL unit as shown in Fig. 28. To have the paging function in the EXES-6000 system, use a PA amplifier and external speaker instead of station B in Fig.

  • Page 28: Station (Group) Paging

    1-2. Station (Group) Paging Fig. 30 Voice Signal Flow of Station Paging and Zone Paging 1-3. Block Diagram of Paging Interface (PI) Unit Fig. 31 Block Diagram of PI Unit (PI-62) Besides the paging by an external PA amplifier, it is possible to page using the station speakers.
  • Page 29 PI-62. Designed so that a maximum of 1 (for EX-600) or 2 (for EX-610/620) or 4 (for EX-630) PI units can be mounted, the EXES-6000 can have all call plus up to 3 paging zones (for EX-600) or all call plus up to 15 paging zones (for EX-610/EX-620) or all call plus up to 31 paging zones (for EX-630).

  • Page 30: Paging Signal Flow 28-3

    1-4. Paging Signal Flow Fig. 32 shows a single LM unit in which zones are divided into 2 by cutting JP6: Zone 1 (P1): Stations No. 200 — No. 203 Zone 2 (P2): Stations No. 204 — No. 207 (A) Here, supposing paging is made from station No.
  • Page 31 Fig. 32 Zone Paging Signal Flow — 29 —...
  • Page 32 Fig. 33 All-Call Paging Signal Flow — 30 —...
  • Page 34 Assigning each station to the designated paging zone will require the assignment plug for the EX-610 and EX-620, and the SA unit (SA-64) for the EX-630. Supose that 4 LM units, LM(1) to LM(4) (32 stations, No.200 through No.231) are used in a system, with stations No.

  • Page 35: Principle Of Conference Function

    V. PRINCIPLE OF CONFERENCE FUNCTION Fig. 35 shows an example where 4 stations (A) to (D) are engaged in conference using the confer- ence function (CL unit is necessary). 1. Example when One Station is in Conference Supposing station (A) alone is speaking, the voice signal flows as follows: Timing 1.

  • Page 36: Example When Two Stations Are In Conference

    In this instance, the voice switch (A) is ON. We will explain why it is so. In Fig. 36, the voice signal that passed through HPF takes two courses: one goes to the voice switch and the other to the comparator (A). The comparator (A) compares the signal strength between the signal from station (A) and one from the mixing point (A), and provides "H"...

  • Page 37: Tie-Line System

    VI. TIE-LINE SYSTEM A maximum number of stations that can be used in the EXES-6000 System in 32 for the EX-600, 64 for the EX-610, 128 for the EX-620 and 256 for the EX-630. But it is possible to increase the total...

  • Page 38: Voice Signal Flow 37~3

    The tone burst signal sent to the dial receiving section of the Tl in exchange B via a tie-line link is then transmitted to the CP through the BPF (Band-pass Filter), amplifier and rectifier (Amp. & Rect. in the Figure), after being converted into the original dial pulse stream by the dial pulse converter.

  • Page 40: Data Transmitting And Receiving System

    VII. DATA TRANSMITTING AND RECEIVING SYSTEM By using the Data Transmitting Unit (DT-E60, DT-E11G or DT-E11) and Data Receiving Unit (DR-B61) in the EXES-6000 System, the ON/ OFF operation of various indicators and the controls of other equipment are possible from...

  • Page 41: Function Setup

    The data transmitting unit (DT) converts the data received from the CP unit in the ex- change, and transmits the converted data to the data receiving unit (DR). After receiving the 1. Function Setup (DIP switch setting) 1-1. DIP Switch Setting for the Data Transmitting Unit DT-E60, ET-E11G or DT-E11 A maximum of 16 data transmitting units can be connected in parallel per exchange.
  • Page 42 Table 1. CHANNELS VS FUNCTIONS FOR CP-60 CHANNEL SELECTION WORD NO. FUNCTIONS One-shot Make Output (100 contacts) 8 Selectable Make 8~13 Output (9 units) In/Out Annunciation 14~20 (100 persons) Pager Control 21~27 Output (100 pagers) Calling Indication 0~15 (32 stations) CH.
  • Page 43 Table 2. CHANNELS VS FUNCTIONS FOR CP-62 CHANNEL SELECTION FUNCTIONS IN/OUT Annunciation (500 persons) Make/Break Output (512/100 contacts) One-shot Make Output CH. 2 (500/50 contacts) (1) 4 Decimal digits output (9 units) (2) Decimal Output (9 units) (3) 8 Selectable Make Output. (9 units) CH.
  • Page 44 Table 3. CHANNELS VS FUNCTIONS FOR CP-63 CHANNEL SELECTION FUNCTIONS CH. 0 IN/OUT Annunciation ( 1 ) One-shot Make Output (50 contacts) (2) Make/Break Output (100 contacts) (3) 8 Selectable Make Output (9 unit blocks) CH. 1 (4) Decimal Output (9 unit blocks) (5) 4 Decimal digits output (9 unit blocks)
  • Page 45 Table 4. CHANNELS VS FUNCTIONS FOR CP-64 CHANNEL SELECTION FUNCTIONS Make/Break Output CH. 1 (512/100 contacts) One-shot Make Output CH. 2 (500/50 contacts) (1) 4 Decimal digits output (9 units) (2) Decimal Output (9 units) (3) 8 Selectable Make Output. (9 units) CH.

  • Page 46: Dip Switch Setting For The Data Receiving Unit

    1-2. DIP Switch Setting for the Data Receiving Unit DR-B61 The DR-B61 will control 32 relays after receiving the data of 512 bits (16 bits × 32 words) from the data transmitting unit. For example, word 1 covers No. 0 through No. 15 and word 2 No. 16 through No.
  • Page 47 Fig. 41 System Block Diagram of Data Transmitting and Receiving Units in CP-6 4 System — 47 —...

  • Page 48: Principle Of Data Transmitting And Receiving System

    A system using the CP-64 requires (16 × 32) × 15 + 1 = 7,681 wires. The data transmitting and receiving system em- ployed in the EXES-6000 mentioned hereafter requires only 2 transmission wires instead of above tremendous number of wires.
  • Page 49 Suppose that the data in Figs. 43 and 44 (1) is stored at an address of WD.1 (Word 1) of Channel 1 of the CPU memory inside the CP unit. The 1-word data consisting of 16 bits is transmit- ted to the DT unit via the 8-bit data bus. Firstly, the lower 8-bit data (0th bit ~ 7th bit) is transmitted, and secondly, upper 8-bit data (8th bit ~ 15th bit).
  • Page 50 Fig. 44 Contents of Data from CPU and Conversion Process into Transmitting Signal (FSK) — 50 —...

  • Page 51: Troubleshooting

    VIII. TROUBLESHOOTING This chapter deals with how to find in the field the defective card in the system already installed, according to symptoms of defect. Now that the field repair is limited to the replacement of the card, it is not referred to how to repair the defective card at the compo- nent level.
  • Page 52 Symptom 2. Call tone does not sound. How to check for a. and b. above. It is possible to confirm the called station number and the type of service signal tone by the lamp status on HC unit. (1) How to find the called station number ( Fig.
  • Page 53 Symptom 3. Call tone is normal, but voice is distorted. Test procedures a. Prepare a couple of normal stations. b. Make a call from one station to another. c. Confirm the occupied link number with the LINK BUSY lamps of the HC unit. See Fig. 46. d.
  • Page 54 Symptom 4. Call tone is distorted. Test procedures a. Prepare a pair of normal stations. b. Make a call from one station to another by means of continuous calling tone, c. Confirm the occupied link number with the LINK BUSY lamp of the HC unit. See Fig. 46. d.
  • Page 55 DUPLEX CONVERSATION SYSTEM At any two stations in a Private Branch Exchange (PBX) system and an Intercom System mutual outgoing/incoming and private conversation are possible. — 55 —...
  • Page 56 DUPLEX TRANSMISSION Simultaneous two-way independent transmission in both directions. Also called full-duplex transmission. FLAG Any of various types of indications used for identification, such as a work mark, or a character that signals the occurrence of some condition, such as the end of a word. FREQUENCY SHIFT KEYING (FSK) A form of frequency modulation used especially in telegraph and facsimile transmission, in which the modulating wave shifts the output frequency between predetermined values corresponding to the...
  • Page 57 For instance, the change of magnetic flux from negative to positive is recorded as "1", and the change from positive to negative as "0". This method applies to data transmitting and receiving system in EXES-6000 system. PI (Paging Interface Unit) Provides paging functions of PA paging and station paging.
  • Page 58 SCAN STROBE SIGNAL A control signal by which the CPU reads the dial data on the dial data bus at an optimum timing when the CPU scans the data. SERIAL DATA The data in which bits are transmitted one after another when the data is processed or transferred. The bits constituting the data are arranged in serial at instants.
  • Page 59 TIME-DIVISION SWITCHING SYSTEM A type of electronic switching system in which input signals on lines and links are sampled cyclically, and each active input is associated with the desired output for a specific phase of the period. VCO (Voltage Controlled Oscillator) A oscillator whose oscillating frequency is varied with applied voltage.
  • Page 60 TOA Corporation KOBE, JAPAN No.833-72-051-30 EGA09101100E Printed in Japan...

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