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Telecast Adder 162 User Manual

Audio/intercom/data multiplexer
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Summary of Contents for Telecast Adder 162

  • Page 1 User Manual...

  • Page 3: Table Of Contents

    Introduction Overview Coaxial Cable Input and Output Status Indicators Battery Backup Audio Input and Output Data Input and Output Representative System Options Unpacking Optical Fiber Installation of the Assembly Line Power Line Power Connection Input Power Fuse DC Current Requirements Battery Charging Electrical Hookups Audio Connections...
  • Page 4 Audio Signal Setup Input Module Setup Gain Impedance Grounding Auxiliary Items Signal Generator/Monitor Status Indicators Power Supply Status Received Signal Level System Interconnections Powering Up Intercom Modules Intercom Connections 4-wire Auxiliary (balanced) Clear-Com RTS Telex Intercom Module Replacement Cable Harness Intercom Setup Switches Theory of Operation Data Connectors...

  • Page 5: Status Indicators

    The Adder 162 accepts up to four modules in any combination for a total of 32 channels in a 6RU, 10 inch high x 19 inch wide electronic equipment rack. The Adder 322 accepts up to eight modules for a total of 64 channels in a 10RU, 17.5 inch high x 19 inch wide electronic...
  • Page 6 Multi-mode WDM (Wavelength Division Multiplexer) Single-mode WDM The Adder 162/322 minimum configuration consists of one input and one or more output modules. Input (Model AI820) and output (Model AO820) modules are installed and tested by Telecast prior to shipment, in accordance with customer specifications. In addition, microphone impedance and bias is preset per customer order, as is preamplifier gain for each channel.
  • Page 7 Replace the caps onto the connectors whenever the fiber is disconnected. Units are shipped ready for rack use. Some Adder 162/322 connections can be made at the front or rear panel, which would have been determined when the order was placed. For bench use, remove the rack mounting flanges by unscrewing them at three places along each flange.
  • Page 8 Figure 3: Adder 322 and 162 rear panels...
  • Page 9 Any 15 VDC external power supply used with the Adder 322 must provide 3.5 amperes continuous current. Although the Adder 162/322 assembly will operate at 10 VDC, ≥13.8 VDC is required to charge the internal backup battery. System operation below 15 VDC can cause battery charge depletion.

  • Page 10: Data Input And Output

    The Model 162/322 assembly accepts and multiplexes four RS-232C or RS-422 digital data signals and two remote relay closures. The 162/322 is also used to receive a transmission, restore the digital signals and provide switch closures. The number of data channels is fixed and independent of the number of audio channels in the assembly.
  • Page 11 Two additional, fiber outputs are available for local splits. This is useful when the same outputs are received at multiple locations. The Adder 162/322 is compatible with industry standard ST type connectors. It may be used with installed backbone cables or with dedicated cables. Consult Telecast for information regarding compatible fiber types.

  • Page 12: Options

    All ports carry digitized, multiplexed audio as well as digital and contact data. Each output has the same capacity with distance capabilities as shown in Table 4. Unless otherwise specified, all transmitters operate at 1300 nm except Tx2 which operates at 1550 nm. Fiber ports Rx1 and Rx2 accept the multiplexed optical signals from the output of another Model 162/322.

  • Page 13: Optical Fiber

    Refer to Optical Fiber or Coax Communication Selection on page 16 for the switch settings on the Main PC Board which govern coaxial use with older Adder 162/322. Figure 7 shows an Input Module and an Output Module. The left ribbon on each module is the signal conductor;...
  • Page 14 DATA POWER ALARMS ICOM GAINS Figure 8: Model 162 Main PC Board More Module Power on 322’s Figure 9: Model 322 Auxiliary Power PC Board...
  • Page 15 Figure 10 shows a Model 162 assembly and Figure 10 shows a Model 322 assembly. Figure 10: Adder 162 and 322 - Modules To change the configuration of your Adder 162/322 assembly: 1. Switch the power to the assembly OFF.
  • Page 16 Switches on the Main PC Board control connectors between Adders over either fiber or coax. Locate SW1 in the lower left corner of the Main PC Board (Figure 8a on page 10). To receive from optical fiber, configure SW1 according to Figure 11. Figure 11: Optical Fiber Receive Switch Setting To receive from coax, configure SW1 according to Figure 12.
  • Page 17 An audible alarm is provided to indicate error conditions. This alarm can be deactivated by the front panel ALARM ON/OFF-RESET switch. Refer to Figure 19 on page 22. In addition, the REMOTE POWER and LOCAL POWER alarms can be disabled internally by SW6. Locate SW6 in the upper right corner of the Main PC Board (Figure 8a on page 14).
  • Page 18 The switches for line or mic input levels, gain, and ground are positioned below the audio connectors on the front panel of each input module. There are eight sets of switches, one set for each channel. Channels are numbered left to right from 1 to 8. The panel switch markings for channels 4 and 5 are shown in Figure 16.
  • Page 19 Use Table 6 to assist in setting up the front panel switches on each input module. You will be setting up: 1. Input Gain: 0, +10, +20, + 30, and +40 dB 2. Input Impedance/Bias Voltage: LOz (600 Ohm), Hiz (10 kOhm) or 48V(at 10 kOhm) 3.
  • Page 20 Table 7: Input Module Switch Settings...
  • Page 21 A signal (tone) generator provides a clean output by which any channel and path can be checked from the audio input right through to the de-multiplexed output at the receiving unit. Both signal level and frequency are controllable and signal levels are calibrated and displayed on a scale on the front panel.
  • Page 22 LED indicators are located on the assembly front panel and on the input and output modules at each connector. The LEDs on the front panels of the assembly are shown in Figure 19. Figure 19: Panel Indicators, Signal Status and Power INPUT POWER When a data connection (fiber or coax) exists between the local and remote units, the bi-color REMOTE LED is green if the remote unit’s external power input is good.
  • Page 23 On Newer Adders, there are no switched to enable coaxial operation. The system runs in COAX PRIORITY which means that it is “looking” for a coax link first and, if one is not found, then goes looking for a fiber link. The OPTICAL SELECT switch toggles between INPUT 1 and INPUT 2, and is useful for testing whether the fibers are good.
  • Page 24 There are four common interconnection configurations for the Model 162/322. Configuration #1 — Standard Full Duplex Operation Audio inputs and outputs Data inputs and outputs Full intercom Refer to Figure 21 when wiring for standard operations. 162/322 162/322 Figure 21: Standard 2-Fiber Connection Configuration #2 —...

  • Page 25: Optical Connections

    1. Pull the lever away from the panel. 2. Move it up for power ON, or down for power OFF. 3. Switch ON the power to all Adder 162/322 units. The power switches at all connected units must be ON for the system to function normally.

  • Page 26: Fiber

    Up to three dual-channel intercom modules can be installed in the Adder 162/322. Three types of intercom modules are available from Telecast: 1. Balanced 4-wire 2. Clear-Com 2-wire 3. RTS/Telex compatible 2-wire Intercom modules are located at the top of the assembly in the Model 162 and along the right side on Model 322 as shown in Figure 25.
  • Page 27 A 2-wire system can be interconnected with a 4-wire system at another Adder 162/322, but not all intercom functions will work (for example, calling).
  • Page 28 Table 7: 4-Wire Intercom Connections FUNCTION IMPEDENCE SIGNALS Ground Input (+) 600 Ohm input Line: +8 dBm Input (-) Mic: -32 dBm Out (+) >=600 Ohm +8 dBm load Out (-) Figure 27: Intercom Module: 4-Wire Auxiliary (balanced) Clear-Com intercom modules have a 3-pin XLR connector for each of the A and B channels. This Telecast module fully supports the Clear-Com signaling protocol and signal levels.
  • Page 29 Figure 28: Intercom Module: Clear-Com The Telecast Clear-Com interface is compatible with powered or unpowered belt packs as well as fixed equipment. You may power 5 to10 belt packs with each intercom module from the internal power supply. Many more belt packs can be added if powered externally. Refer to your intercom manufacturer’s documentation for additional system details.
  • Page 30 Should you want to change or add modules, you may have to reset certain switches on the Main PC Board of the Adder 162/322 assembly. A multi-conductor harnessed cable built into the Adder 162/322 runs behind the module locations.

  • Page 31: Removing And Replacing Modules

    To change an intercom module in the assembly: 1. Turn the power OFF. 2. Remove the screws that hold the module to be replaced. 3. Remove the Input and Output modules at locations 3 and 4 from the bottom of the assembly to gain access to the Main PC Board (see Removing and Replacing Modules on page 15).
  • Page 32 The Adder 162/322 circuit block diagram shown in Figure 31 is a representative system with one 8-channel module in each unit. The Adder 162/322 operating as a transmitter accepts up to 32/64 audio inputs and up to four digital inputs. Time division multiplexes them onto a single optical fiber or coaxial cable.
  • Page 33 Figure 32: DATA and Relay Digital Input Circuit Figure 33: Digital Data Output Circuit Output The audio output circuit is shown in Figure 34. The output impedance between pin 2 and 3 is 30 Ohm, balanced. Output characteristics are given in the Intercom Interface section.
  • Page 34 MC33179 15Ω Ferrite 100pF 2kΩ Bead 2kΩ .015 Film 4.99kΩ 2kΩ 2kΩ 100pF Ferrite 15Ω MC33179 Bead Figure 34: Audio Output Circuit Unbalanced operation is possible by using pins 1 and 3. Do NOT short pin 2 or 3 to ground or severe distortion will result.
  • Page 35 Figure 35: Audio Input Schematic The main circuits in the Adder 162/322 are described in Table 10. Table 10: Adder 162/322 Main Circuits A/D Input High speed A to D converters located in each audio channel. Multiplexer, Input Sequentially presents four RS-232/422 digital inputs, two contact closures and up to 64 digitized audio signals from the A/D converters to the optical output driver.
  • Page 36 Front Panel Power Switch +13.8 VDC to +18 VDC Power to Electronics Charge Switch Internal Control Mode Front Panel, Battery Circuit Power Power DC INPUT Connector External Power Internal Reserve Front Panel Figure 36: Battery Charger Block Diagram The optical output is generated from a high power Lased Diode coupled to the fiber. User connections are made at a bulkhead type ST connector on the front panel of the assembly.
  • Page 37 The optical fibers couple power from the transmitters to the receivers. Operation of this system hinges on the correct optical power levels. These levels can be measured with an OPTICAL POWER METER such as the Telecast model PMTR-ST-3W or equivalent. The power meter is calibrated in units of dBm, or power referenced to 1 milliwatt expressed in dB where 0 dBm is 1 milliwatt and -30 dBm is 1 microwatt.

  • Page 38: Gain

    Transmission Method Digital Time Division Multiplexing (TDM) System Aggregate Data Rate 147.5 Mbps Modules 8 Channel INPUT (AI820) or 8 Channel OUTPUT (AO820) Number of Modules Model 162 4 (32 total channels); any combination Model 322 8 (32 total channels); any combination Analog to Digital Conversion 24 bit delta sigma Sample Rate...
  • Page 39 Connector Male 3-pin XLR Output Impedence 30 Ohm Balanced Maximum Output level +18 dBm @ 1kHz, 600 Ohm Total Intercom Channels Compatibility (each of 3 modules) 4-Wire (std) (2) Balanced, non-powered, 5-Pin Male XLR Switchable MIC/LINE input, line output only ClearCom (Option) (2) Unbalanced powered, 3-Pin Male XLR RTS (Option)

  • Page 40: Impedance

    Distance Limits 305 meters (1,000 feet) If unable to resolve the problems with your Adder 162 or 322 System, call Telecast Fiber Systems, Inc. for assistance at 508-754-4858 and ask for our service department. To return a unit for repair, you must obtain a return material authorization (RMA) number from Telecast.

This manual is also suitable for:

Adder 322

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