FIBERLINK
XRD-8050, XRD-8050/RK
Fiber Optic Linear Multidrop
RS-232 Transmission System
For Traffic Signal Controller Applications
USER’S MANUAL
55 Hauppauge, NY 11788 USA
TEL: (631) 273-0404 • FAX: (631) 273-1638
INTERNET: http://www.commspecial.com
EMAIL: info@commspecial.com
Communiations Specialties Pte Ltd
Serving the Asia Pacific Region
100 Beach Road
#22-09 Shaw Tower
Singapore 189702
TEL: +65 6391 8790 FAX: +65 6396 0138
EMAIL: csiasia@commspecial.com
P/N: 101921 Rev.E
CONTENTS
Quick Installation Guide ............................................................................... 2
General Information ...................................................................................... 3
Introduction
Specifications
Theory of Operations
Functional Block Diagram
Installation Instructions for XRD-8050 (stand-alone version) ...................... 5
Installation Procedure
Signal and Power Connections
Anti-Streaming Time-Out
Master/Local Selection, System Configuration
Optical Fiber Compatibility
Battery Backup Operation
Installation Instructions for XRD-8050/RK (rackmounted version)............. 9
Signal Connections
Indicator LEDs
Interface Troubleshooting ........................................................................... 10
Signals vs. Pin Connections and Other Details
Operating Considerations for Fiber Optic Cable ......................................... 12
Overall Fiber Optic System Checkout & Troubleshooting Techniques ......... 13
Maintenance ................................................................................................ 15
Statement of Warranty ................................................................................. 16
1
QUICK INSTALLATION GUIDE
The following is a quick installation guide for the FIBERLINK XRD-8050. 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, please
consult the balance of this manual.
12-18 Volts AC*
12-18 Volts DC*
*
2
GENERAL INFORMATION
Introduction
The FIBERLINK XRD-8050 is a fiber optic transceiver designed to implement a
digital master/local data bus for traffic signal controller networks using
CALTRANS 170 or 179 series, or NEMA style controllers. The transceiver is
normally connected in a “daisy-chained” linear multidrop configuration mounted
external to the controller. A rack mountable version, the XRD-8050/RK is also
available for use in an MCR-2000 universal card cage enclosure.
The XRD-8050 is fully compatible with EIA standard RS-232 and will accommodate any duty cycle or code format. In addition, a user adjustable anti-streaming
time-out feature is included as well as an internal back-up battery (in the standalone version) for continuous operation during a loss of prime operating power.
The XRD-8050 contains signal indicator LEDs for continuous monitoring of all
data transmitting and receiving functions.
Technical Specifications
System Protocol ............................................. EIA RS-232
System Data Rate .......................................... DC to 100 Kb/s, Asynchronous
Optical Loss Budget ...................................... 62.5u MM Fiber, 0-15 dB
8/10u SM Fiber, 0-17 dB
Transmitter Launch Power (Typical) ............ 850 nm MM, 40 uw (-14 dBm)
1300 nm MM, 40 uw (-14 dBm)
1300 nm SM, 60 uw (-12 dBm)
Receiver Sensitivity (Typical) ....................... 850/1300 nm, 1uw (-30 dBm)
Operating Opitcal Wavelength ...................... 850 nm or 1300 nm
Optical Connectors ........................................ Multimode, ST
Single mode, ST or FCPC
Anti-Streaming Timeout Range .................... 4,8,16,32 or 64 seconds
Operating Temperature Range ...................... -37 to +74 degrees, Celcius
Battery Backup Operating Interval................ 12 hours
3
Theory of Operation
The FIBERLINK XRD-8050 is user-configurable to one of two modes, MASTER
or LOCAL, and the block diagram below shows the signal flow in either of these
configurations. As will be noted from the diagram, the unit consists of two
optical transmitters and two optical receivers contained within the same housing.
Depending on the setting of an internal MASTER/LOCAL switch, the interconnections between the transmitters and receivers are varied to properly input,
output and/or repeat the data signals as required.
In addition, an anti-streaming circuit is provided to monitor the RTS port. If any
traffic signal controller connected to the XRD-8050 reverts to a streaming
condition, the pre-set time-out of the anti-streaming circuit will be exceeded and
all further data from the faulty controller will be blocked thereby preventing
system lock-up.
A rechargeable internal battery is provided in the stand-alone version of the
XRD-8050. In typical traffic signal network communications, this battery can
provide up to 12 hours of operation during the loss of prime power.
Functional Block Diagram of XRD-8050 and XRD-8050/RK
4
INSTALLATION INSTRUCTIONS FOR XRD-8050
All that is required for normal operation of the FIBERLINK XRD-8050 standalone unit is to connect signal, power and the fiber optic cables between units
and to set the internal DIP switches for the correct mode of operation.
Installation Procedure
The following procedure is intended to simplify the installation of the XRD8050 unit. Be sure to follow all steps carefully and to double check all connections. Specific details regarding the various functions follow this procedure.
1) Connect the traffic signal controller to be used to the DB-25S signal
connector on the XRD-8050. The mating plug is a standard DB-25P and the
pin connections are tabulated in the “SIGNAL CONNECTIONS” section
that follows.
2) Connect operating power to the 3 position terminal block on the XRD-8050
as per the information in the “POWER SUPPLY CONNECTIONS” section
that follows.
3) Remove the top cover on the unit and set the ANTI-STREAMING and
MASTER/LOCAL switches as required per the information in the appropriate section that follows.
4) Connect the XRD-8050 units being used together with fiber optic cable. Be
certain that the proper “transmit” (T1 or T2) connector of one unit is
connected to the proper “receive” (R1 or R2) connector of the other units.
Note the information in the “OPTICAL FIBER” section that follows.
5) The system should now be operational.
Note that the transmitting element in the “-7”
single-mode version of the XRD-8050 uses a solid
state Laser Diode located in the optical connector on
the unit. This device emits invisible infra-red radiation
which may be harmful to human eyes. As a result,
direct viewing of this radiation should be avoided.
5
Signal Connections
The signal connections for the XRD-8050 follow the recommended EIA DCE
format for RS-232. These connections are described below and must be compatible with the equipment being used. All signal connections are made via an
industry standard DB-25S connector.
Description EIA Designation DB-25S Pin Number
Chassis Ground (AA) 1
Transmitted Data (BA) (input) 2
Received Data (BB) (output) 3
Request to Send (CA) (input) 4
Clear to Send (CB) (output) 5
Data Set Ready (CC) (output) 6 (jumped to 20)
Signal Ground (AB) 7
Data Carrier Detect (CF) (output) 8
Data Terminal Ready (CD) (input) 20 (jumped to 6)
All other signal pins are not utilized.
Power Supply Connections
12 to 18 volts AC Position 1 of 3 position terminal block
12 to 18 volts DC Position 2 of 3 position terminal block
AC or DC Return (Common) Position 3 of 3 position terminal block
Anti-Streaming Time-Out
The XRD-8050 contains an internal timer which will block the RS-232 input
signal to any unit in the event that a faulty data streaming condition is produced
by any traffic signal controller. This timer is triggered by the rising edge of the
RTS signal. When the pre-set time interval is exceeded, the CTS line will be
forced low and the data input to the XRD-8050 blocked, thereby preventing
system lockup. The unit will then remain in the blocked state until the RESET
button on the front panel on the unit is pressed. Only the XRD-8050 connected
6
to the faulty controller will be affected. The other units in the system will
continue to operate normally. The DIP switch settings are as follows:
• DIP SWITCH 1 ON: 4 seconds • DIP SWITCH 4 ON: 32 seconds
• DIP SWITCH 2 ON: 8 seconds • DIP SWITCH 5 ON: 64 seconds
• DIP SWITCH 3 ON: 16 seconds • DIP SWITCH 6 ON: Disabled
Be certain that only one DIP switch is turned ON at any time. All others should
be left in the OFF position.
Master/Local Selection and System Configuration
The XRD-8050 must be user-configured for MASTER or LOCAL operation.
DIP switch settings and an overall system configuration diagram are as follows:
For MASTER Operation: Set DIP Switch 1 and 3 OFF, 2 and 4 ON
For LOCAL Operation: Set DIP Switch 1 and 3 ON, 2 and 4 OFF
Optical Fiber Compatibility
Various versions of the XRD-8050 will successfully operate with most multimode or single-mode optical fibers. These versions are as follows:
XRD-8050-1 Multimode 62.5u Fiber 850nm ST Connector
XRD-8050-3 Multimode 62.5u Fiber 1300nm ST Connector
XRD-8050-7 Single-mode 8/10u Fiber 1300nm FCPC Connector
XRD-8050-8 Single-mode 8/10u Fiber 1300nm SMST Connector
7
Battery Backup Operation
The XRD-8050 (stand-alone) contains a rechargeable battery pack that will
provide up to 12 hours of operation in the event of a primary power failure.
Switchover to battery operation is automatic and, upon return to primary power,
recharging is also automatic. Note that the XRD-8050 must be connected to
primary power for at least 16 hours to assure full charging of the battery pack.
The battery pack is disconnected during shipment. Be certain to reconnect the
battery pack by plugging the small 2-pin plug into the appropriate jack
.
8
INSTALLATION INSTRUCTIONS FOR XRD-8050/RK
(Rackmountable Version)
The FIBERLINK XRD-8050/RK is designed to plug directly into one position of a
Model MCR-2000 rack mountable card cage. All operating power is then
provided by this card cage. The optical and RS-232 signal connections are
available on connectors provided on the rear on the plug-in assembly.
The XRD-8050/RK is fully compatible with the XRD-8050 stand-alone version.
Signal Connections
The signal connections for the XRD-8050/RK follow the recommended EIA
DCE format for RS-232. These connections are described below and must be
compatible with the equipment being used. All signal connections are made via
an industry standard DB-25S connector. Be certain to make all connections
carefully and check that the correct pins are being used.
Description EIA Designation DB-25S Pin #
Chassis Ground (AA) 1
Transmitted Data (BA) (input) 2
Received Data (BB) (output) 3
Request to Send (CA) (input) 4
Clear to Send (CB) (output) 5
Data Set Ready (CC) (output) 6 (jumped to 20)
Signal Ground (AB) 7
Data Carrier Detect (CF) (output) 8
Data Terminal Ready (CD) (input) 20 (jumped to 6)
All other signal pins are not utilized and all other details are the same as for the
XRD-8050 stand-alone version.
9
INTERFACE TROUBLESHOOTING
Indicator LEDs
PWR Indicates that operating power is applied to the XRD-8050
TD1, TD2 Indicates that a “high state” logic signal is being transmitted
RD1, RD2 Indicates that a “high state” logic signal is being received
FAULT Indicates that the ANTI-STREAMING timer has timed out
and that the unit is in the blocked state.
The XRD-8050 is intended for use with CALTRANS 170 and 179 series as well
as NEMA type traffic signal controllers. As a result, the RS-232 “handshake”
signals have been configured for proper use with these units.
The tabulations below and on the following page indicate what to look for if the
system does not operate properly.
XRD-8050 in TRANSMIT MODE
Pin Description Condition
1 Chassis Ground (input/output) 0 VDC
2 Transmitted Data (input) Pulses at data rate
3 Received Data (output) Undetermined
4 Request to Send (input) +3.75 to +15 VDC
5 Clear to Send * (output) +3.75 to +15 VDC
6 Data Set Ready (output) Same as Pin 20
7 Signal Ground (input/output) 0 VDC
8 Data Carrier Detect (output) +3.75 to +15 VDC
20 Data Terminal Ready (input) Jumpered to Pin 6
*Clear to Send will only remain in this state if the anti-streaming timer has not
been triggered.
10
XRD-8050 in RECEIVE MODE
Pin Description Condition
1 Chassis Ground (input/output) 0 VDC
2 Transmitted Data (input) Undetermined
3 Received Data (output) Pulses at data rate
4 Request to Send (input) +3.75 to +15 VDC
5 Clear to Send * (output) +3.75 to +15 VDC
6 Data Set Ready (output) Same as Pin 20
7 Signal Ground (input/output) 0 VDC
8 Data Carrier Detect (output) +3.75 to +15 VDC
20 Data Terminal Ready (input) Jumpered to Pin 6
* Clear to Send will only remain in this state if the anti-streaming timer has not
been triggered.
In addition to the above, check that the ANTI-STREAMING time-out interval is
correct for the data rate being used and that the MASTER/LOCAL switches are
set properly. Also refer to both the general troubleshooting techniques and
those regarding fiber optic cable.
11
OPERATING CONSIDERATIONS FOR
FIBER OPTIC CABLE
The XRD-8050 may be supplied with ST, FCPC or single-mode ST type optical
connectors and will operate with most common fiber optic cables.
Since the XRD-8050 can be provided for operation at a wavelength of 850nm or
1300nm, the fiber optic cable employed should be chosen so that it is optimized
for operation at the appropriate wavelength.
When using any type of fiber optic cable be certain to not cause excessive
strains especially at the cable-to-connector junction. Also, do not subject the
cable to sharp bends or pull around sharp corners. Whenever possible, service
loops or extra slack should be provided in any installation. While excessive
precautions are not necessary, fiber optic cable does contain thin, fragile strands
of glass and as such should be treated with moderate care.
Notes Regarding Fiber Optic Cable
Multimode fiber optic cable contains an optical fiber with a light carrying “core”
that is only 0.0025 inches (62.5u) in diameter. Single-mode fiber optic cable has an
even smaller “core”, only 0.00032 to 0.0004 inches (8-10u). This is smaller than a
human hair! Any minute particle of dirt or dust can easily block this fiber from
accepting or radiating light. As a result, the key word is cleanliness. Always use the
dust caps provided with optical connectors whenever they are exposed to air. Also,
always try to gently clean the tip of an optical connector with alcohol whenever
dust is suspected.
Mechanical butt splices or optical feedthroughs must be installed properly. Multimode devices will not operate properly with single-mode connectors even though
they may look the same. Using the wrong device can easily add more optical
attenuation than specified with the result that system performance can be compromised.
Attempting to use multimode fiber with a single-mode system will usually result in
overloading of the fiber optic receiver with the result that the system will produce
distorted output signals or simply not work at all. Using single-mode fiber with a
multimode system will result in not enough light reaching the receiver with the
result that the transmission distance will be greatly reduced and in some cases, the
system will not operate at all.
As a result, always use the fiber optic cable the system is specifically designed for.
12
OVERALL SYSTEM CHECKOUT AND TROUBLE-
SHOOTING TECHNIQUES
Occasionally, during the installation of a fiber optic transmission 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 transmitting section of a transceiver)
1. Is the operating power (DC, AC, Voltages) correct?
2. Are the pins being used on the connector or terminal block correct?
. 3. Is the correct signal level present at the transmitter input?
4. If the unit is a digital transmitter, does the transmitting LED glow
dimly when a signal is applied? Note that this is only true at an
operating wavelength of 850nm. Light at 1300nm is totally invisible. *
5. If the unit is an analog or video transmitter (at 850nm) is there a
continuous dim glow from the transmitting LED? *
6. Is the optical connector on the transmitter clear of any obstruction or
minute dirt particles?
7. Does it matter that signal ground and power ground of many systems
are common?
8. Does the fact that signal ground, power ground and the housing are
common cause a short-circuit anywhere in the system?
* The above visual check should only be attempted with LED type emitters.
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. Is the correct connector being used for the type of fiber optic cable
employed? Some multimode connectors look the same as their singlemode counterparts at first glance.
2. Are the ends of the connectors free from all dust or dirt? If not, gently
clean the ends with a clean cloth moistened with alcohol.
3. Is the fiber broken in the connector? A quick inspection with an
inexpensive 10X jeweler’s loop can determine this.
4. Is the fiber protruding from the tip of the optical connector? If so,
refinishing will be necessary.
C. Check Fiber Optic Cable
1. Is the correct fiber size being used with the correct
transmitter/receiver combination?
2. Does the fiber optic cable have too much attenuation (loss) for the
system?
3. Does the fiber optic cable pass light at all? A small penlight type
flashlight can usually be used for this test.
4. Is the fiber optic cable pulled too tightly around a sharp corner?
D. Check Receiver (or receiving section of a transceiver)
1. Is the operating power (DC, AC, Voltages) correct?
2. Are the pins being used on the connector or terminal block correct?
3. Is light coming out of the fiber optic cable? This may be difficult to
see in many cases, but sometimes a very dim glow is present. Note
that you can only see 850nm light. Light at 1300nm is invisible.
4. Is the optical connector on the receiver clear of any obstruction or
minute dirt particles?
5. Does the fact that signal ground, power ground and the housing are
common cause a short-circuit anywhere in the system?
14
MAINTENANCE
The FIBERLINK XRD-8050 has been manufactured using the latest semiconductor devices and components that electronic technology has to offer. It has been
designed for long, reliable and trouble free service and is not normally field
repairable.
Should difficulty be encountered, Communications Specialties maintains a
complete service facility with trained technicians to answer any interface
questions as well as to render accurate, timely and reliable service of our
products.
The only maintenance that can be provided by the user is to ascertain that
optical connectors are free from dust or dirt that could interfere with light
transmission and that all electrical and signal connections are secure and correct.
All other questions should be directed to our customer service department. It
should be noted that many “problems” can easily be solved by a simple telephone call.
In situations where an XRD-8050 unit must be returned to Communications
Specialties for repair or replacement, an RMA number must first be obtained.
Please refer to the warranty informaton on the following page for further
information regarding our repair policy.
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 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
Communiations Specialties Pte Ltd - Serving the Asia Pacific Region
100 Beach Road
#22-09 Shaw Tower
Singapore 189702
TEL: +65 6391 8790 FAX: +65 6396 0138
EMAIL: csiasia@commspecial.com
Please have your serial number available when contacting us.
16
Loading...