Telecast Adder 882 Bedienungsanleitung
Adder
ä
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
Adder 882
ii 1 April 1999
Telecast
Table of Contents iii
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
Digital I/O ..................................................................................................................................12
Optical .......................................................................................................................................15
Preventive Maintenance ............................................................................................................16
Accessory List ...........................................................................................................................16
Troubleshooting .........................................................................................................................16
Specifications .............................................................................................................................18
Warranty ....................................................................................................................................20
Adder 882
iv 1 April 1999
Telecast
List of Figures v
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. Main Circuit Board .......................................................................................................5
Figure 7. ST Optical Connectors on the Rear Panel.....................................................................6
Figure 8. XLR Connectors on the Rear Panel..............................................................................7
Figure 9. RS-422 D Connectors on the Rear Panel......................................................................8
Figure 10. Power Connector and Fuse Locations...........................................................................8
Figure 11. Front Panel....................................................................................................................9
Figure 12. Electronics Block Diagram.........................................................................................10
Figure 13. Audio Input Buffer Circuit..........................................................................................11
Figure 14. Audio Output Buffer Circuit.......................................................................................11
Figure 15. Digital I/O Connectors 1, 3, 5 and 7 ...........................................................................13
Figure 16. Digital I/O Connectors 2, 4, 6 and 8 ...........................................................................14
Figure 17. Battery Charger Block Diagram .................................................................................15
List of Tables
Table 1. Maximum Fiber Lengths............................................................................................... 3
Table 2. Audio Inputs.................................................................................................................. 4
Table 3. Input and Output Cable Connections............................................................................ 6
Table 4. Digital Cable Connections ............................................................................................ 7
Table 5. Power Connections ....................................................................................................... 8
Table 6. Adder 882 Main Circuits ............................................................................................ 17
Table 7. Troubleshooting Chart ................................................................................................ 18
Adder 882
vi 1 April199
Telecast
Introduction 1
Introduction
The Telecast Adder
TM
882 System consists of two Adder 882 Þber optic
multiplexer/demultiplexers that simultaneously send and receive up to eight audio signals, eight
digital datas, and four remote relay closures in each direction. These signals are transmitted on
optical Þbers. Audio inputs are set up by internal DIP switches that set ampliÞer gain to accept
either mic or
line levels. Audio outputs are always at line levels. Digital inputs and outputs are
RS-422 and RS-232 compatible signals. Four of the digital connectors also provide contact
closure input and output. The other four connectors alternatively provide SONY CCU compatible
interfaces. All connections are made via the rear panel. See Figure 1.
Figure 1. Rear Panel of the Adder 882
Within an Adder 882 unit, the audio signals are Þrst digitized and then multiplexed with the
digital data and control signals. The combined electrical signal is converted to an optical signal,
launched into the optical Þber and sent to a second Adder 882. This second unit receives the
optical signal, converts it into an electrical data stream, demultiplexes the signals and restores the
audio signals to analog levels.
An internal Ni-Cad battery provides backup in the event of line power loss.
The Adder 882 is available with several optical options and conÞgurations.
¥ Standard connection with bidirectional signals carried on two optical Þbers at either 850, 1300,
or 1550 nm.
¥ 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
A
and receive the 850 nm signal on ST connector
B
. They are
connected by the two Þbers so that the optical output of each box is connected to the optical input
of the other. In both one and two Þber systems, the input of channel 1 on one unit becomes the
output of channel 1 on the other unit, and vice versa.
In a one Þber system, the two Adder 882 units are
not identical
and are conÞgured before
shipment. They must be used as a pair. The units are connected by a single Þber that is wavelength
division multiplexed (WDM). One unit transmits from the
A
ST connector at a wavelength of
1300 nm and also receives at 850 nm on the same connector. The other unit transmits from the
A
ST connector at 850 nm and similarly receives at 1300 nm on the same connector.
Figure 3 illustrates available optical conÞgurations of the ADDER 882.
2AMP, SLO BLO
AUDIO IN 1
AUDIO OUT 1
DC INPUT
12-24VDC
OPTICAL I/O
A(Tx)
B(Rx)
DATA I/O
AUDIO IN 2
AUDIO OUT 2
AUDIO IN 3
AUDIO OUT 3
AUDIO IN 4
AUDIO OUT 4
AUDIO IN 5
AUDIO OUT 5
AUDIO IN 6
AUDIO OUT 6
AUDIO IN 7
AUDIO OUT 7
AUDIO IN 8
AUDIO OUT 8
1
3
5
7
2
4
6
8
Adder 882
2 1 April 1999
Figure 2. Block Diagram of a One Fiber System
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
850 nm
1300 nm
Unit A Unit B
1300 nm
850 nm
LED
WDM
DET
ST type
Single Optical
850 nm
1300 nm
LED
WDM
DET
8Audio in
8Digital in (RS-422)
8Audio out
8Digital out (RS-422)
Audio in 8
Digital in (RS-422) 8
Audio out 8
Digital out (RS-422) 8
connector
Fiber
850 nm
850 nm
1300 nm
1300 nm
1550 nm
1550 nm
850 nm
1300 nm
Unit AUnit B
Unit A Unit B
Unit A Unit B
Unit A Unit B
Unit AUnit B
1300 nm
1550 nm
TX 850 nm
RX 850 nm
TX 1300 nm
RX 1300 nm
TX 1550 nm
RX 1550 nm
TX 850 nm
RX 1300 nm
TX 1300 nm
RX 1550 nm
RX 850 nm
TX 850 nm
RX 1300 nm
TX 1550 nm
RX 850 nm
TX 1300 nm
RX 1550 nm
TX 1550 nm
RX 1300 nm
TX 1300 nm
Telecast
Installation 3
Installation
Inspect the units for mechanical damage. Inspect all electrical connectors for bent or damaged
pins and latches. Report any damage to the carrier and to Telecast Fiber Systems, Inc.
Leave the protective plastic caps on the optical connectors until it is time to attach the Þber(s) to
the units. Store the caps in the plastic bag packed with this manual. Place the caps back on the
connectors whenever the Þbers are left disconnected.
Rack Mounted Installation
Units are shipped ready for bench use. To rack mount the units, mounting adapters must be
attached. Each adapter is held in place by two #10 ßat head screws (see Figure 4).
Figure 4. Installing the Rack Mount Adapters
Place the units in their intended locations before attaching any cables or wires. This will prevent
accidental damage to the cables or their connectors.
Fiber Optic 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.
The system units have been conÞgured at the factory for the Þber type with which they are going
to be used.
Mark or tag the optical Þbers when they are pulled, carefully avoiding the Þber tip, so that their
identity is known at both ends. If there is confusion about the identity of the two Þbers, illuminate
the end of one Þber with a ßashlight and look for the light at the other end.
Table 1. Maximum Fiber Lengths
Fiber core diameter Maximum Þber length
50 microns 5 km (3 mi)
62.5 microns 3 km (2 mi)
8 microns (single mode) 10 km (6 mi)
ADDER 882
ä
AUDIO/DATA MUX/DEMUX
TELECAST
FIBER SYSTEMS, Inc.
Made in the USA
Adder 882
4 1 April 1999
WARNING Do NOT use the Adder 882 optical output for this purpose. Never look
directly into the end of the optical Þber while either end of the system is
operating. Eye damage is possible.
Inspect the Þber ends and clean them with clean, dry compressed air or with Kim-Wipes that have
been wet with isopropyl alcohol. Fingerprints or other dirt on the optical connector end surfaces
will reduce the received optical signal level.
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.
Procedure
1. Determine which inputs will be connected to microphones and for which line I/O the 10 dB
boost/cut is to be used.
2. Copy Table 2 and Þll in the required I/O characteristics. Recopy the original table for use with
other hookups.
3.
With the power switch off
, take off the top cover of the unit by removing the #4 ßat head screw
at each corner.
In Figure 5,
A
refers to the odd numbered channel and
B
refers to the even numbered channel of
the pair.
4. With the rear of the unit facing you (connector end), move the slide switches shown in
Figures 5 and 6 to match the settings in Table 2. The controls are arranged in pairs.
Table 2. Audio Inputs
Channel Number
UNIT A SWITCH SETTING 12345678
MIC
IN
(0 or +40 db gain)
LINE
IN
(0 or +10 db gain)
INPUT IMPEDANCE
(600
W
or 5 k
W
)
LINE
OUT
(0 or
-
10 db gain)
UNIT B SWITCH SETTING 12345678
MIC
IN
(0 or +40 db gain)
LINE
IN
(0 or +10 db gain)
INPUT IMPEDANCE
(600
W
or 5 k
W
)
LINE
OUT
(0 or
-
10 db gain)
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