TH3 Digital Telephone Hybrid OPERATING INSTRUCTIONS and trouble-shooting guide LECTROSONICS, INC.
INTRODUCTION Lectrosonics is proud to offer the TH3, our third generation digital hybrid. The TH3 interfaces with a standard telephone line to add teleconferencing capability to any sound system. Sophisticated featues, fast setup, easy operation, high sound quality and low cost make the TH3 an ideal choice for board rooms, conference rooms, talk radio and countless other applications.
Digital Telephone Hybrid FRONT PANEL LECTROSONICS, INC. RIO RANCHO, NM DIGITAL HYBRID U.S.A. CODEC TELEPHONE RX TX RX LEVEL TRIM LEVEL TX LEVEL LecNet ANTI-ECHO LecNet ANTI-ECHO RX LEVEL TX LEVEL The TX LEVEL control is used to set the proper amount of local signal, with the aid of the TX LEVEL meter. The TELEPHONE RX LEVEL control is used to set the proper telephone receive level, with the aid of the RX LEVEL meter.
REAR PANEL PWR IN EXPANSION OUT (CH40) IN REMOTE CONTROLS LecNet TELEPHONE (RS232) 20 VAC CODEC The PWR IN jack must be attached to an appropriate power source, such as the included CH40 wall transformer. The EXPANSION OUT and EXPANSION IN jacks are used to attach the TH3 to other LecNet equipment (e.g. AM8 or AM16 mixers). The LecNet (RS232) jack may be connected to the serial port of a personal computer for configuration and testing.
Digital Telephone Hybrid BRIEF TECHNICAL DESCRIPTION The TH3 provides a high-quality, flexible and powerful interface to a telephone line, a 4-wire video codec, or both simultaneously with bridging. Each interface offers basic controls to connect, invoke privacy (selective mute), and perform fine adjustments to the receive volume. The basic controls are available from the front panel, the wired remote controls, and via the serial port.
TH3 WIRING GUIDE Following are example wiring diagrams for various types of installations. Example 1: AM8 MIXER PWR IN EXPANSION OUT (CH40) In this example, the TH3 is connected to an AM8 mixer, and both local and remote signals are amplified. The single LecNet cable passes signals both to and from the AM8. IN REMOTE CONTROLS LecNet TELEPHONE (RS232) 20 VAC CODEC TH3 LECTROSONICS, INC.
Digital Telephone Hybrid PWR IN EXPANSION OUT (CH40) IN REMOTE CONTROLS LecNet TELEPHONE (RS232) 20 VAC AUX CODEC IN OUT + – + – OUTPUT LEVEL TH3 LECTROSONICS, INC. PWR IN (CH40) 20 VAC EXPANSION M A S T E R S L A V E OUT IN REMOTE LEVEL CONTROL LecNet + – CH8 IN 1 2 3 4 In this example, the TH3 is connected to a pair of AM8 mixers. Both local and remote signals are amplified. The single LecNet cable passes signals both to and from the AM8. LECTROSONICS, INC.
REMOTE CONTROLS TELEPHONE CODEC AUX IN OUT + – + – OUTPUT LEVEL FINE LEVEL RECORD OUT RELAY + – COARSE LEVEL MIC LINE Example 5: NON-LECTROSONICS MIXER In this example, the TH3 is connected to a third-party mixer, and both local and remote signals are amplified. Note that the combined local and remote signal is derived from the record out jack on the TH3.
Digital Telephone Hybrid BASIC OPERATION This chapter describes the TH3’s most essential user functions. The word “interface” is used here to distinguish between the controls associated with the telephone (“telephone interface”) and those associated with the 4-wire codec (“codec interface”). Placing a Telephone Call Telephone calls may be initiated from the TH3’s front panel, from a wired remote control, or from a PC or control system connected via the TH3’s serial port.
Privacy Feature The PRIVACY buttons mute the respective interface’s transmit signal, receive signal, or both, depending on the interface’s current privacy mode. As the privacy feature is engaged, the PRIVACY led flashes a confirmation to indicate the current privacy mode, then glows steadily. The privacy modes and confirmation flashes are listed in the following table.
Digital Telephone Hybrid Establish a telephone call (the BASIC OPERATION chapter tells how to do this), preferably to an actual person, group or location to which this TH3 will typically connect. If this is not possible, a call may be placed to a recorded message service. Press both TELEPHONE RECEIVE VOLUME buttons simultaneously to reset the user telephone receive volume to its default setting (0 dB). Adjust the TELEPHONE RX LEVEL control so that the red led on the RX LEVEL meter lights only occasionally.
Starting the Control Panel Software To start the TH3 software control panel, it is first necessary to run LecNet Master Pro. If LecNet Master Pro does not immediately detect the TH3, check to make sure that the LecNet PC cable is connected from the PC’s COM port to the TH3. Check also that LecNet Master Pro is accessing the correct COM port. Once the TH3 is properly detected, the TH3 software control panel can be started by choosing Select Device from LecNet Master Pro’s Devices menu.
Digital Telephone Hybrid The receive volume is implemented as a slider but it selects the receive volume in the same way that the front panel buttons do, with a range of -12 to +6 dB in 1 dB steps (a total of 19 positions). The Echo Suppression sliders choose the amount of echo suppression applied to each interface. Echo suppres sion refers to the dynamic trade-off of gain between the transmit and receive paths during conversation.
The TH3 Signal Routing Window The TH3 Signal Routing window permits the TH3’s internal signal routing to be modified for unusual applications. The default settings are as shown, with all inputs and outputs enabled, and the supplementary echo canceller inserts bypassed. Most applications do not require any change to these settings. Unchecking AUX Input mutes the TH3’s AUX IN port. AUX OUT continues to function normally, and the TH3’s other inputs are unaffected.
Digital Telephone Hybrid SERIAL PORT HARDWARE AND SOFTWARE Serial Port Hardware Connection The serial port on the TH3 is a minimal RS-232 implementation. The figure shows the wiring diagram to accommo date interconnection with either a 9- or a 25-pin serial port on a PC or other serial device. LecNet Device to PC S R T 3.5MM Stereo Plug LecNet Device to AMX or Crestron S R T 9 or 25 Pin Female D-Subminiature 9 Pin Female D-Subminiature 3.
LecNet SERIAL PORT PROTOCOL All LecNet devices use a modification of the typical one-to-one connection between two RS-232 compatible devices. LecNet devices have both an RS-232 transmitter and receiver section. The transmitter section is “tri-stated”, or placed in a high impedance mode, until the particular device is addressed.
Digital Telephone Hybrid General Device Commands Get Device Name - Causes the TH3 to send its “name” string back. The first data byte is the length of the name string, and the rest of the data bytes are the device name. Host sends command - 1 Host receives data bytes: Byte 1 is the length of the name string (3 for the TH3), bytes 2 thru 4 are the ASCII values for “TH3”. Set Device Address - Changes the TH3’s device address. The new setting persists when the TH3 is powered off.
Set Codec Privacy - Engages or disengages codec privacy feature. This command has no effect if the codec interface is not connected. Host sends command - 36 Host sends byte: 0 to disengage privacy feature, 1 to engage Get Codec Privacy - Retrieves privacy status of codec interface. Host sends command - 37 Host receives data byte: 0 if disengaged, 1 if engaged DTMF Tone Commands Send DTMF Tone - Causes the TH3 to dial a single DTMF digit.
Digital Telephone Hybrid Set Auto Answer - Configures the TH3’s automatic telephone answering feature. Host sends command - 56 Host sends byte: 0 to disable the feature, 1-10 to specify a ring count on which to answer the telephone. Get Auto Answer - Retrieves the current status of the TH3’s automatic telephone answering feature. Host sends command - 57 Host receives data byte: 0 if disabled, 1-10 specifies ring count on which TH3 answers. Set Phone Rx AGC - Configures the telephone receive AGC.
Get Audible Ring Chime - Retrieves status of audible ring chime feature. Host sends command - 69 Host receives data byte: 0 if feature is disabled, 1 if enabled Set Phone Echo Suppression - Selects amount of echo suppression applied to telephone interface. Host sends command - 70 Host sends byte in range 36-72: 36 represents 12 dB of suppression, 72 represents 24 dB of suppression. Any amount in between may be selected for continuous adjustment between 12 and 24 dB in 1/3 dB incre ments.
Digital Telephone Hybrid Set Codec Rx Atten - Performs fine adjustment of codec receive volume. Host sends command - 82 Host sends byte in range 0-54, 126 or 127: 0 represents +6 dB, 18 represents 0 dB, 54 represents -12 dB. All values in between 0 and 54 are valid, representing 1/3 dB increments. A value of 126 causes the receive volume to decrease 1 dB. A value of 127 causes the receive volume to increase 1 dB. Get Codec Rx Atten - Retrieves current fine adjustment of codec receive volume.
ACCESSORIES Standard 21552 21553 21554 21551 21529 40024 LNETWIN M-TH3 35679 21580 15 ft.
Digital Telephone Hybrid Privacy Modes The privacy switch on the TH3 can do three different things, based on the interface’s current privacy mode. The three modes are, “mute tx only”, “mute rx only”, and “mute tx and rx”. Supplementary Echo Canceller The term “supplementary echo canceller” refers to any third-party acoustic echo canceller. Such a device may be used to supplement the existing echo cancelling abilities of the TH3. Typically, an additional 5 dB of echo cancella tion may be achieved.
TROUBLESHOOTING The following are general guidelines and initial suggestions. If a problem persists, please refer to the section, SERVICE AND REPAIR. Telephone interface won’t stay connected. The automatic disconnect feature is disconnecting the line inappropriately. Ensure that the telephone line is connected to the telephone line jack and not the telephone set jack. Ensure that the line is live by connecting a telephone to the telephone set jack and getting a dial tone.
Digital Telephone Hybrid FCC PART 68 COMPLIANCE This equipment complies with Part 68 of the FCC rules. On the rear panel of this equipment is a label that contains, among other information, the FCC registra tion number and ringer equivalence number (REN) for this equipment. If re quested, this information must be provided to the telephone company. This equipment uses the following USOC jacks: RJ11C. The REN is used to determine the quantity of devices which may be connected to the telephone line.
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Digital Telephone Hybrid SERVICE AND REPAIR If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment needs repair. Make sure you have followed the setup procedure and operating instructions.
LIMITEDONE ONE YEAR YEAR WARRANTY LIMITED WARRANTY The equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer. This warranty does not cover equipment which has been abused or damaged by careless handling or shipping. This warranty does not apply to used or demonstrator equipment. Should any defect develop, Lectrosonics, Inc.
