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Summary of Contents for Telecast Adder 882
- Page 1 ä Adder 882 System Instruction Manual Telecast Fiber Systems, Inc. 102 Grove Street Worcester, MA 01605 Tel: 508-754-4858 Fax: 508-752-1520 www.telecast-Þber.com...
- Page 2 Adder 882 1 April 1999...
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Page 3: Table Of Contents
Telecast Table of Contents Introduction ..........................1 Unpacking ............................2 Installation ...........................3 Rack Mounted Installation ......................3 Fiber Optic Installation ........................3 Audio Setup ..........................4 Procedure .............................4 Optical Connections ........................6 Electrical Connections .........................6 Input Power Fuse .........................8 Operating Details .........................9 Battery Charging ..........................9 Powering Up ..........................9 Theory of Operation ........................10... - Page 4 Adder 882 1 April 1999...
- Page 5 Telecast List of Figures Figure 1. Rear Panel of the Adder 882..................1 Figure 2. Block Diagram of a One Fiber System .................2 Figure 3. Possible Optical Configurations ...................2 Figure 4. Installing the Rack Mount Adapters ................3 Figure 5. Audio Setup Controls....................5 Figure 6.
- Page 6 Adder 882 1 April199...
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Page 7: Introduction
¥ One Þber connection with optically combined bidirectional signals at 850/1300 nm or 1300/1550 nm as shown in Figure 2. In a standard two Þber system, identical Adder 882 units are used at each location. The units both transmit at 850 nm on ST connector and receive the 850 nm signal on ST connector . -
Page 8: Unpacking
RX 1550 nm TX 1550 nm Figure 3. Possible Optical ConÞgurations Unpacking The Adder 882 System consists of: ¥ Two Adder 882 multiplexer/demultiplexer units ¥ Two external power supplies (AC/DC adapters) ¥ Rack mount hardware kits ¥ Plastic or metal covers for optical connectors... -
Page 9: Installation
The installer is responsible for providing the Þber optic cable runs which are available from Telecast Fiber Systems, Inc. Refer to the Accessory List on page 16 of this manual for the cable and other items required for system installation. Be sure that the Þber core diameters are compatible with the intended installation distances as shown in Table 1. -
Page 10: Audio Setup
Audio Setup The setup switches for line or microphone inputs levels are inside the Adder 882. Setup steps are not required if all inputs are at the factory default 600 W, 0 dB gain, line level. Setup is required if microphone inputs are used, if 5 k W input impedance is required, or if the optional 10 dB boost/cut is desired on line inputs. -
Page 11: Figure 5. Audio Setup Controls
Telecast Output Input Gain Gain Ä Ä Fine -10 -10 Level Switches are shown in the factory default position. Inputs @ 600 W, unity gain. Outputs @ unity gain. Figure 5. Audio Setup Controls 5. Replace the top cover and gently reinstall the screws. -
Page 12: Optical Connections
Never look directly into the end of the optical Þber while either end of the system is operating. Eye damage is possible. The Adder 882 is compatible with industry standard ST type connectors. It may be used with installed backbone cables or with dedicated cables. -
Page 13: Figure 8. Xlr Connectors On The Rear Panel
Telecast Female XLR Male XLR A (Tx) AUDIO IN 1 AUDIO IN 2 AUDIO IN 3 AUDIO IN 4 AUDIO IN 5 AUDIO IN 6 AUDIO IN 7 AUDIO IN 8 DC INPUT AUDIO OUT 1 AUDIO OUT 2 AUDIO OUT 3... -
Page 14: Input Power Fuse
Fuse Figure 10. Power Connector and Fuse Locations Any power supply used with the Adder 882 must supply 1.5 amperes continuous current. Use the wiring connections shown in Table 5. The power connector is Switchcraft D4M. Table 5. Power Connections... -
Page 15: Operating Details
This indicator is meaningful only if one of the other two LEDs is on. ¥ . An audible alarm has been incorporated into the Adder 882 in addition to the AUDIBLE ALARM LED indicators on the front panel. This alarm alerts the user that the internal batteries are discharging. -
Page 16: Theory Of Operation
Adder 882 Theory of Operation The Adder 882 circuit block diagram is shown in Figure 12. The unit has two basic functions: multiplexing signals onto an optical Þber, and demultiplexing signals from an optical Þber. The Adder 882 accepts up to eight audio inputs, eight digital inputs and four remote relay closures and time division multiplexes them onto a single optical Þber. -
Page 17: Figure 13. Audio Input Buffer Circuit
Telecast Ferrite Bead 2.49k MC33078 4.64k 4.99k 10pF Audio In 10pF Mode 4.99k MC33078 Ferrite Bead 2.49k Figure 13. Audio Input Buffer Circuit The audio output circuit is shown in Figure 14. The output impedance is 30 W, balanced. MC33179... -
Page 18: Digital I/O
Adder 882 Digital I/O The digital input buffer circuits shown in Figures 15 and 16 accept and drive industry standard RS-422, RS-423, and RS-232 signal levels. These circuits may be used to convert from one signal format to another. The digital output circuit shown in Figure 15 can be conÞgured by the user to provide SONY CCU compatible I/O;... -
Page 19: Figure 15. Digital I/O Connectors 1, 3, 5 And 7
Telecast Figure 15. Digital I/O Connectors 1, 3, 5 and 7 Theory of Operation... -
Page 20: Figure 16. Digital I/O Connectors 2, 4, 6 And 8
Adder 882 Figure 16. Digital I/O Connectors 2, 4, 6 and 8 1 April 1999... -
Page 21: Optical
Þber system uses a wavelength division multiplexer to combine and then to separate the two colors used. The main circuits in the Adder 882 are described in Table 6. The basic setup is illustrated in Figure 2 on page 2. -
Page 22: Preventive Maintenance
Troubleshooting Refer to the troubleshooting chart on the following page. If you are unable to resolve the problems with your Adder 882 System, call Telecast Fiber Systems, Inc. at 508-754-4858 and ask for our service department. To return a unit for repair, obtain a return material authorization (RMA) number from Telecast service. -
Page 23: Table 7. Troubleshooting Chart
INTERNAL RESERVE not go on, replace the battery. Check for broken or disconnected Þbers or No operation Optical communications that the Adder 882 unit at the other end is LED on failure not operational. On a one Þber system, LINK STATUS refer to Figure 2 on page 2. -
Page 24: Specifications
Adder 882 SpeciÞcations Audio Characteristics Input Signal Levels balanced (low Zin) Unity gain +18 dBm peak +10 dB +8 dBm peak +40 dB -22 dBm peak balanced (high Z Unity gain +16 dBV peak +10 dB +6 dBV peak +40 dB... -
Page 25: Power Requirements
RM-M7, RM-P3 or compatible 0-20 kBits/sec 1.12 msecs Jitter *Higher rates possible dependent on user system jitter tolerance. ** Request Telecast Application Note for more information. Contact Closure Input TTL Ò1Ó or open circuit Remote contact open TTL Ò0Ó or shorted to circuit ground... -
Page 26: Warranty
Buyer's sole and exclusive remedy for breach of warranty shall be such refund, replacement or repair. A claim of defect in materials or workmanship in any Product shall be allowed only when it is submitted in writing to Telecast Fiber Systems, Inc. within seven days after discovery of the defect, and in any event within the Warranty Period.
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