FIBERLINK®
XA-1900, XA-1903, RA-1900, XR-1900
IRIG Transmission System
USER’S MANUAL
WORLD HEADQUARTERS
55 Cabot Court
Hauppauge, NY 11788 USA
TEL: (631) 273-0404 FAX:(631) 273-1638
WWW: http://www.commspecial.com
EMAIL: info@commspecial.com
Communications Specialties Pte Ltd
100 Beach Road
#22-09 Shaw Tower
Singapore 189702
TEL: +65 6391 8790 FAX: +65 6393 0138
EMAIL: csiasia@commspecial.com
P/N: 101958 Rev. E
CONTENTS
Quick Installation Guide ................................................................................... 2
General Information ......................................................................................... 3
Introduction
Technical Specifications
Theory of Operation
Functional Block Diagram
Installation Instructions for XA-1900 and XA-1903 ........................................ 5
Installation Procedure
Signal and Power Connections
Operating Pointers
Installation of XA-1900 in MCR-1000A
Installation Instructions for RA-1900 and XR-1900 ........................................ 8
Installation Procedure
Signal and Power Connections
Operating Pointers
Installation of RA-1900 in MCR-1000A
IRIG System Configurations .......................................................................... 11
Interface Troubleshooting............................................................................... 12
Operating Instructions for Fiber Optic Cable ................................................. 13
Overall System Checkout and Troubleshooting Techniques .......................... 13
Maintenance ................................................................................................... 15
Statement of Warranty .................................................................................... 16
1
QUICK INSTALLATION GUIDE
The following is a quick installation guide for the Fiberlink® XA and RA-1900. It
is intended for users familiar with the installation of fiber optic transmission
systems to get “up and running” in minimal time. For additional details, or for
installation of the XA-1903 and XR-1900 please consult the balance of this
manual.
Stand-Alone Version
Pin B* = +15 to +24 VDC
or
*Use either AC (Pin A) or
DC (Pin B). DO NOT
USE BOTH.
Pin A*= 14 to 18 VAC 50/60 Hz
Pin D = DC or AC Common
Rack Mountable Version
The Fiberlink XA-1900 and RA-1900 may also be used in the MCR-1000A rackmountable card cage. In order to accomplish this, they must first be mounted to
individual AP-1000 adapter plates with the four enclosed nylon binder head
screws. Then the 5 pin power connector and BNC IRIG cable on the adapter
plate must be connected. When this is done, the units may be plugged directly
into the card cage. All operating power for the XA-1900 and RA-1900 will then
be provided by the MCR-1000A card cage.
2
GENERAL INFORMATION
Introduction
The Fiberlink XA-1900 IRIG Fiber Optic Transmitter is designed to convert wide
band IRIG analog signals into modulated light for transmission over fiber optic
cables. The transmitter employs linear, intensity modulation and is suitable for
use with most optical fibers. The XA-1900 employs a single ended, unbalanced
input which is compatible with all IRIG input formats. There is only one
operating control on the XA-1900 series. This is an input attenuator, designed to
allow input signals larger than the normal 1 volt rms level to be accommodated.
The XA-1903 is a 10 channel optical output version of the XA-1900 and is
designed for IRIG signal distribution applications.
The RA-1900 IRIG Fiber Optic Receiver is the companion receiver for the XA1900 and XA-1903. It converts the modulated light from a fiber optic cable
back into an exact replica of the original transmitted signal. The RA-1900 is
intended for driving single ended, unbalanced loads in accordance with IRIG
standards. There is only one operating control on the RA-1900 series. This is
an output level control and is used to compensate for the optical attenuation of
the fiber being used. The XR-1900 is an optical to electrical “tap/repeater”
designed for IRIG distribution systems.
Technical Specifications
System Bandwidth (+0, -3 dB) ............................ 20Hz to 100KHz
Input/Output Load Impedance ............................. 600 Ohms Nominal
Input/Output Signal Voltage ................................ 1 volt rms
Signal/Noise Ratio ............................................... 67 dB typical
Noise Floor (full bandwidth) ............................... 1.3 mv rms max.
Optical Loss Budget ............................................ 50u Fiber, 0-10 dB
62.5u Fiber, 0-13 dB
8/10u Fiber, 0-10 dB
Operating Wavelength ......................................... 850 nm, 1300 nm
Optical Connectors .............................................. ST, SMA or FCPC
Operating Temperature Range ............................. -20 to +60 degrees C
3
Theory of Operation
The Fiberlink XA-1900 converts an incoming audio signal into a varying current
that intensity modulates the transmitting LED located in the optical connector on
the unit. The modulated light is then applied to a fiber optic cable.
The RA-1900 detects the light coming from a fiber optic cable by a photodiode
located in the optical connector on that unit. The small current produced by the
photodiode is amplified and applied to a driver stage. This stage provides the
proper output voltage to drive the required load. The output level adjustment is
used to set the output audio to the proper level.
The XA-1903 is functionally the same as 10 XA-1900 units in one housing.
The XR-1900 is functionally the same one XA-1900 and one RA-1900 in the
same housing.
4
INSTALLATION INSTRUCTIONS FOR
XA-1900 AND XA-1903
Installation Procedure
The Fiberlink XA-1900 is supplied pre-aligned for use with an input signal of 1
volt rms. It may be put into service by simply making the appropriate signal and
power connections. When input voltages in excess of the normal 1 volt rms level
are to be accommodated, the following procedure (in particular, steps 2, 3, and 4)
should be followed:
1. It will be necessary to have a source of +15 to +25 volts DC or 14 to 18
volts AC 50/60 Hz. Be certain to make all connections carefully and check
hat the correct pins are being used.
2. Turn the input attenuator , located in the white plastic bushing between the
electrical connectors on the XA-1900, fully clockwise (10 - 15 turns will be
(adequate). In the XA-1903, this attenuator is located on the internal P/C
board, near the input BNC connector, and is labeled R1. When using the
XA-1903, also set the rear panel input switch to the 600 ohm position.
3. Apply power and, with no signal applied, connect an oscilloscope between
the test jack, located next to the optical output connector and the case of
transmitter for the XA-1900, and on the P/C board for the XA-1903. Any
of the points labeled TP!, TP2, TP3, TP4 or TP5 may be used. The
oscilloscope will show the current flowing through the transmitting LED,
which exactly corresponds to the signal being transmitted.
4. Apply the signal to be transmitted and slowly turn the attenuator until the
signal appears on the scope. Now continue to turn the attenuator until a
maximum peak-to- peak amplitude of 0.8 volts is obtained. This point
constitutes full modulation. If the signal level is increased further, distortion and clipping will occur. The best level is just below the clipping point.
5. Once this adjustment has been made, the transmitter is ready for operation.
5
Note that the transmitting element in the “-7” single mode
version of the XA-1900, the XA-1903 and the transmitting
section of the XR-1900 uses a solid state Laser Diode
located in the optical connector on the unit. This device
emits invisible infrared electro-magnetic radiation which
may be may be of sufficient intensity to cause instantaneous
damage to the retina of the human eye. As a result, direct
viewing of this radiation should be avoided at all times.
Signal and Power Connections
The XA-1900 may be powered from an external AC or DC power supply. Pin
connections are as follows:
PIN FOR DC OPERATION FOR AC OPERATION
A No Connection 14 to 18 volts 50/60Hz
B +15 to +25 volts No Connection
D DC Common AC Common
E No Connection No Connection
H No Connection No Connection
Please note that AC and DC common is connected to the enclosure.
The mating power connector for this system is an Amphenol 126-223 or
equivalent.
For operation from 115 VAC 60Hz, a Communications Specialties
=XP-1000A
plug-in adapter may be used. This adapter is supplied with the appropriate
connector installed.
Signal connections are made via a standard BNC type signal connector. Pin
connections are as follows:
Center pin Signal
Outer shell Signal return and ground
6
Operating Pointers
Driving Signal: The input to the XA-1900 is an AC coupled 600 ohm
impedance. It can be driven by any source including lines
with DC levels (below 4 volts) present. The signal return is
connected to case ground and power ground.
The XA-1903 may be switched between the 600 ohm
impedance level and a high impedance level. The high
impedance level is used to connect additional XA-1903 units
to form a distribution system. When this feature is desired,
connect the original IRIG signal to the input BNC connector
of the first XA-1903 and the output BNC connector of that
unit to the input BNC connector of the second XA-1903 and
so on until all XA-1903 units have been connected. Then set
all impedance switches to the high impedance position except
for the last XA-1903, which should be set for 600 ohms.
Power Supplies: The power input to the XA-1900 is designed to accept AC or
DC voltages. In order for proper operation, the AC level
should not drop below 14 volts rms or the DC level, below 15
volts DC. As long as this criteria is met, unregulated sources
may be used. To prevent damage, voltages higher than 18
volts AC or 25 volts DC should not be applied. Suitable
voltages can be obtained from various low voltage
transformers or from a Fiberlink XP-1000A, 115 to 14
VAC plug-in adapter.
Note that one side of the DC input or AC input is connected to
the case.
The XA-1903 operates from 115/239 VAC 50/60 Hz.
Optical Fiber: Versions of the XA-1900 and XA-1903 are available to drive
most multimode (MM) and single-mode (SM) optical fibers.
The specific models are identified by a suffix at the end of the
model number as follows:
7
Fiber Size Connector 850nm 1300nm
50u, 62.5u MM ST -1 -3
50u, 62.5u MM SMA -2 -4
8/10u SM FCPC - -7
Installation of XA-1900 in the MCR-1000A Card Cage
The XA-1900 can be used in the MCR-1000A rack-mountable card cage. In
order to accomplish this, it must first be mounted to an AP-1000 adapter plates
with the four enclosed nylon binder head screws. Then the 5 pin power
connector and BNC IRIG cable on the adapter plate must be connected. When
this is done, the unit is ready to be plugged into the card cage. All operating
power for the XA-1900 will then be provided by the MCR-1000A card cage.
The XA-1903 may be directly mounted in a standard 19 inch rack frame.
INSTALLATION INSTRUCTIONS FOR
RA-1900 AND XR-1900
Installation Procedure
The RA-1900 and XR-1900 are provided with a single control that will have to
be adjusted prior to putting the unit in service. This control is used to
compensate for existing optical cable attenuation. Since optical cable
attenuation is a function of the fiber optic cable used, the receiver will have to be
re-adjusted, with the actual fiber optic cable used in the system as follows:
1. Apply power and signal to both the RA-1900 to be used as well as the
matching XA-1900 or channel being used on the XA-1903. For alignment
purposes, the input signal to the transmitter should be a 1 KHz, 1 volt rms
sine wave.
2. Connect the fiber optic cable from the transmitter to the receiver, and a 600
ohm load resistor to the output connector of the receiver.
3. Connect an oscilloscope across the 600 ohm load resistor.
4. Adjust the output level control until 1 volt rms is obtained.
5. This completes alignment of the receiver.
8
The XR-1900 consists of an XA-1900 and RA-1900 in the same package. As a
result, the installation instructions for the XR-1900 transmitter section is the
same as for the XA-1900 and the installation instructions for the XR-1900
receiver section is the same as for the RA-1900.
BE CERTAIN TO READ AND OBSERVE THE WARNING
RELATING TO THE XR-1900 IN THE
XA-1900 SECTION OF THIS MANUAL.
Signal and Power Connections
The RA-1900 and XR-1900 may be powered from an external AC or DC power
supply. Pin connections are as follows:
PIN FOR DC OPERATION FOR AC OPERATION
A No Connection 14 to 18 volts 50/60Hz
B +15 to +25 volts No Connection
D DC Common AC Common
E No Connection No Connection
H No Connection No Connection
Please note that AC and DC common is connected to the enclosure.
The mating power connector for this system is an Amphenol 126-223 or
equivalent. For operation from 115 VAC 60Hz, a Fiberlink XP-1000A plug-in
adapter may be used. This adapter is supplied with the appropriate connector
installed.
Signal connections are made via a standard BNC type signal connector. Pin
connections are as follows:
Center pin Signal
Outer shell Signal return and ground
9
Operating Pointers
Output Signal: The output of the RA-1900 and XR-1900 is designed to drive
load impedances of 600 ohms or more. The RA-1900
employs an unbalanced output configuration with signal return
connected to case ground and power ground. Attempting to
drive lower impedance loads may result in distortion and low
output levels.
Power Supplies: The power supply considerations for the RA-1900 and
XR-1900 are the same as for the XA-1900.
Optical Fiber: Versions of the RA-1900 and XR-1900 are available to drive
most multimode (MM) and single-mode (SM) optical fibers.
The specific models are identified by a suffix at the end of the
model number as follows:
Fiber Size Connector 850nm 1300nm
50u, 62.5u MM ST -1 -3
50u, 62.5u MM SMA -2 -4
8/10u SM FCPC - -7
Installation of RA-1900 in the MCR-1000A Card Cage
The RA-1900 can be used in the MCR-1000A rack-mountable card cage. In
order to accomplish this, it must first be mounted to an AP-1000 adapter plates
with the four enclosed nylon binder head screws. Then the 5 pin power
connector and BNC signal cable on the adapter plate must be connected. When
this is done, the unit is ready to be plugged into the card cage. All operating
power for the RA-1900 will then be provided by the MCR-1000A card cage.
10
IRIG SYSTEM CONFIGURATIONS
The XA-1900, RA-1900 and XR-1900 are designed to configure an IRIG pointto-point or distribution system. The diagrams below show both configurations.
11
INTERFACE TROUBLESHOOTING
Some troubleshooting pointers to consider when this system is not operating
properly are:
XA-1900, XA-1903 or Transmitting Section of XR-1900
Is operating power present and connected to the proper pins on the power
connector?
Is an IRIG signal present at the input connector of the unit?
Is the input attenuator set properly?
Is the impedance switch on the XA-1903 set properly?
RA-1900 or Receiving Section of XR-1900
Is operating power present and connected to the proper pins on the power
connector?
Is the correct fiber optic cable connected between the transmitter and receiver?
Is the correct size fiber being used for the particular transmitter/receiver
combination?
Is the attenuation of the fiber optic cable within the range of the system’s loss
budget specifications?
Is an IRIG signal present at the output connector of the unit?
Is the output attenuator set properly?
If all of the above is correct and the system is still not operating, please contact
the Customer Service Department for further assistance.
12
OVERALL SYSTEM CHECKOUT AND
TROUBLESHOOTING TECHNIQUES
Occasionally, during the installation of a fiber optic system, difficulties arise that
are the result of factors beyond the control of the installer.
It is to simplify the task of the installer that the following general checkout
procedure is included.
A. Check Transmitter or Transmit Section of a Transceiver
1. Is operating power (DC, AC, Voltages) correct?
2. Are the correct pins on the connector or terminal block being used?
3. Is the correct signal level present at transmitter input?
4. Does the transmitting LED glow dimly when a signal is applied? Note
that this is only true for an operating wavelength of 850 nm. Units at
1300 nm are totally invisible.*
5. If the unit is an analog or video transmitter (at 850 nm), is there a
continuous dim glow from the transmitting LED? *
6. Is the optical connector on the transmitting LED clear of any obstruction or minute dirt particles?
7. Does the fact that the power ground and signal ground of many systems
are common, matter?
8. Does the fact that the power ground, signal ground, and case are
common cause a short circuit anywhere in the system?
* The above visual check should only be attempted with LEDs.
NEVER LOOK DIRECTLY AT AN OPERATING
LASER DIODE REGARDLESS OF THE
OPERATING WAVELENGTH!!!
US Government regulations require that all equipment using Laser Diodes be
clearly identified with appropriate warning labels. Be sure to heed these labels.
13
B. Check Optical Connectors
1. If stepped 906 type SMA optical connectors are being used, are the
short plastic alignment sleeves normally supplied with the connectors
being used? If they are not present, the system may not work properly!
2. Are the connectors are being used the correct size for the fiber being
used?
3. Are the ends of the connectors free of all dust or dirt? If not, gently
clean the tip of the connector with a clean cloth or gauze moistened
with alcohol.
4. Is the fiber broken in the connector? A quick inspection with an
inexpensive jeweler’s loop can determine this.
5. Is the fiber protruding from the tip of the connector? If so, refinishing
will be necessary.
C. Check Fiber Optic Cable
1. Is the fiber optic cable pulled too tightly around a sharp corner?
2. Is the correct fiber size being used with the correct transmitter/receiver
combination?
3. Does the fiber pass light at all? A small penlight or flashlight can
usually be used for this test.
4. Does the fiber have too much attenuation for the system? The attenuation measured on the reel will always be different after the cable is
installed.
5. When using very short lengths, less than 10 meters (30 feet), overloading of the receiver may occur. The shorter the length of the fiber, the
greater the possibility for this condition. Be sure there is adequate
attenuation in any system. If this seems to be the case, or if operation
with a meter or so of fiber is required, contact the factory.
14
D. Check Receiver or Receiving Section of a Transceiver
1. Is the operating power (DC, AC, Voltages) correct?
2. Are the correct pins on the connector or terminal block being used?
3. Is light coming out of the fiber optic cable? This may be difficult to see
in many cases, but a dim glow may be present with 850nm light. Other
wavelengths, such as 1300 nm, are totally invisible.
4. Is the optical connector on the receiver optical port clear of any
obstruction or minute dirt particles?
5. Does it matter that the power ground and signal ground of many
systems are common?
MAINTENANCE
The Fiberlink XA-1900, XA-1903, RA-1900 and XR-1900 have all been
manufactured using the latest semiconductor devices and techniques that
electronic technology has to offer. They have been designed for long, reliable,
and trouble free service and are not normally field repairable.
Should difficulty be encountered, Communications Specialties maintains a
complete service facility to render accurate, timely and reliable service of all
products.
The only maintenance that can be provided by the user is to ascertain that optical
connectors are free of dust or dirt that could interfere with light transmission and
that electrical connections are secure and accurate.
All other questions or comments should be directed to our Customer Service
Department. It should be noted that many “problems” can easily be solved by a
simple telephone call.
15
WARRANTY
Communications Specialties warrants that for a period of three years after
purchase by the Buyer, all Fiberlink® transmission systems will be free from
defects in material and workmanship under normal use and service. A Return
Material Authorization (RMA) number must be obtained from Communications
Specialties before any equipment is returned by the Buyer. All material must be
shipped to Communications Specialties at the expense and risk of the Buyer.
Communications Specialties’ obligation under this warranty will be limited, at its
option, to either the repair or replacement of defective units, including free
materials and labor. In no event shall Communications Specialties be
responsible for any incidental or consequential damages or loss of profits or
goodwill.
Communications Specialties shall not be obligated to replace or repair
equipment that has been damaged by fire, war, acts of God, or similar causes, or
equipment that has been serviced by unauthorized personnel, altered,
improperly installed or abused.
RMA numbers and repairs can be obtained from:
Communications Specialties, Inc.
55 Cabot Court
Hauppauge, N.Y. 11788 USA
Tel: (631) 273-0404. Internet: www.commspecial.com
FAX: (631) 273-1638 Email: info@commspecial.com
Customers in the Asia Pacific Region should contact:
Communications Specialties Pte Ltd, Singapore.
TEL: +65 6391 8790 FAX: +65 6396 0138
Please have your serial number available when contacting us.
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