Telecast Adder 882i Manuel utilisateur
Adder™ 882i
Intercom/Data Multiplexer
Instruction Manual
Telecast Fiber Systems, Inc.
102 Grove Street
Worcester, MA 01605
Tel: 508-754-4858
Fax: 508-752-1520
www.telecast-fiber.com
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3
Table of Contents
Introduction 7
Unpacking 9
Installation 9
Rack Mounted Installation 9
Fiber Optic Installation 10
Audio Setup 10
Optical Connections 12
Electrical Connections 13
Intercom Modules 13
4-Wire 14
Clear-Com 14
RTS/Telex 15
Intercom Replacement 16
Digital Data 17
Power Connections 18
Input Power Fuse 19
Operating Details 19
Battery Charging 19
Indicators 19
Powering Up 20
Theory of Operation 21
Digital I/O 22
Optical 23
Preventive Maintenance 24
Accessory List 24
Troubleshooting 24
Specifications 25
Warranty 27
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5
List of Figures
Figure 1. Front Panel of the Adder 882i 7
Figure 2. Single Fiber System 8
Figure 3. Other Optical Options 8
Figure 4. Installing the Rack Mount Adapters 9
Figure 5. 4-Wire Setup Controls 11
Figure 6. Main Circuit Board 12
Figure 7. ST Optical Connectors on Rear Panel 12
Figure 8. Intercom Module: 4-Wire (balanced) 14
Figure 9. Intercom Module: Clear-Com 15
Figure 10. Intercom Module: RTS/Telex 16
Figure 11. Data "D" Connectors on Front panel 18
Figure 12. Power Connector and Fuse Locations 18
Figure 13. Front Panel Indicators 19
Figure 14. Electronics Block Diagram 21
Figure 15. Digital I/O Connectors 1-4 22
Figure 16. Digital I/O Connectors 5-8 22
Figure 17. Battery Charger Block Diagram 23
List of Tables
Table 1. Maximum Fiber Lengths 10
Table 2. 4-Wire Inputs 11
Table 3. 4-Wire Connections 14
Table 4. Clear-Com Connections 14
Table 5. RTS/Telex Connections 16
Table 6. Digital Data Connections 17
Table 7. Power Connections 18
Table 8. Adder 882i Main Circuits 23
Table 9 Troubleshooting Chart 24
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Introduction
The Telecast AdderTM 882i System consists of two Adder 882i fiber optic
multiplexer/ demultiplexers that simultaneously send and receive multiple
intercoms, eight digital datas, and four remote relay closures in each direction.
These signals are transmitted on optical fibers. Audio levels for 4-Wires are set
up by internal DIP switches that set amplifier gain to accept either mic or 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 except fiber and coax I/O and power are made via the front panel.
See Figure 1.
ADDER
882i
™
INTERCOM/DATA SYSTEM
Telecast
MADE IN USA
Fiber Systems, Inc.
1 2 3 4
EXTERNAL
POWER
INTERNAL
RESERVE
RECEIVE
STATUS
AUXILIARY
4-WIRE
AUDIO I/O
+8 dBm MAX
DATA/TALLY
DATA/CCU
POWER
1 2 3 4 5 6 7 8
A B
A B
+8dBm MAX LEVEL
600 Ohm
AUXILIARY
4-WIRE
AUDIO I/O
RTS
2-Wire
GAIN IN
GAIN OUT
NULL
B A
POWER
PORTS
TERM
ON
OFF
d
w
Clear-Com
2-Wire
POWER
PORTS
TERM
ON
OFF
d
w
GAIN
IN
OUT
NULL
A B
+8dBm MAX LEVEL
600 Ohm
AUXILIARY
4-WIRE
AUDIO I/O
Figure 1: Front Panel of the Adder 882i
Within the Adder 882i unit, the intercom audio signals are first 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 fiber and sent on
to a second Adder 882i. 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 882i is available with several optical options and configurations.
• Standard connection with bidirectional signals carried on two optical
fibers at either 1300 or 1550 nm.
• One fiber connection with optically combined bidirectional signals at
1300/1550 nm as shown in Figure 2.
In a standard two-fiber system, identical Adder 882i units are used at each
location. The units both transmit at 1300 nm on the Tx ST connector and receive
the 1300 nm signal on the Rx ST connector. They are connected by the two
fibers so that the optical output of each box is connected to the optical input of
the other.
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In a one-fiber system, the two Adder 882 units are not identical and are
configured before shipment. They must be used as a pair. The units are
connected by a single fiber that is wavelength division multiplexed (WDM). One
unit transmits from the Tx ST connector at a wavelength of 1300 nm and also
receives at 1550 nm on the same connector. The other unit transmits from the Tx
ST connector at 1550 nm and similarly receives at 1300 nm on the same
connector.
Figure 3 illustrates available optical configurations of the ADDER 882i.
Figure 2: Single Fiber operation
Figure 3: Other optical options
Unpacking
The Adder 882i System consists of:
• Two Adder 882i multiplexer/demultiplexer units
• Intercom Modules
• Two external power supplies (AC/DC adapters)
• Rack mount hardware
• Plastic or metal covers for optical connectors
Installation
Inspect the units for mechanical damage. Inspect all electrical connectors for
bent or damaged pins. 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 fiber(s) to the units. Place the caps back on the connectors whenever
the fibers are disconnected.
Rack Mounted Installation
Units are shipped ready for rack mount. Each “ear” adapter is held in place by
two #10 flat 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.
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Fiber Optic Installation
The installer is responsible for providing the fiber optic cable runs that are
available from Telecast Fiber Systems, Inc. Refer to the Accessory List on page
18 of this manual for the cable and other items required for system installation.
Be sure that the fiber core diameters are compatible with the intended installation
distances as shown in Table 1.
Fiber core diameter
Maximum fiber length
50 micron
5 km (3 miles)
62.5 micron
3 km (2 miles)
8 micron (single mode)
10 km (6 miles)
Table 1: Maximum Fiber Lengths
The units have been configured at the factory for the fiber type with which they
are going to be used. Mark or tag the optical fibers when they are installed,
carefully avoiding the fiber tip, so that their identity is known at both ends. If there
is confusion about the identity of the two fibers, illuminate the end of one fiber
with a flashlight and look for the light at the other end.
WARNING: Do NOT use the Adder 882i optical output for this purpose.
Never look directly into the end of the optical fiber while either end of the
system is operating. Eye damage is possible.
Inspect the fiber ends and clean them with clean, dry compressed air or with
Kim-Wipes and 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 mic input levels are inside on the mother-board of
the Adder 882i. Setup steps are not required if all inputs are at the factory default
600 W, 0 dB gain, line level. This would include Clear-Com and RTS intercoms.
Setup is required for 4-Wire intercoms if mic level inputs are used, if 5 kW input
impedance is required, or if the optional 10 dB boost/cut is desired on line inputs.
Procedure
1. Determine which inputs will be used for 4-Wire applications where the
10 dB boost/cut can be used.
2. Copy Table 2 and fill in the required I/O characteristics.
3. With the power switch off, take off the top cover of the unit by removing
the #4 flat head screws at each corner.
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