Communications specialties Fiberlink xrd-8050 User manual

55 Hauppauge, NY 11788 USA

TEL: (631) 273-0404 • FAX: (631) 273-1638

INTERNET: http://www.commspecial.com

EMAIL: [email protected]

P/N: 101921 Rev.E

USER’S MANUAL

FIBERLINK

XRD-8050, XRD-8050/RK

Fiber Optic Linear Multidrop

RS-232 Transmission System

For Traffic Signal ControllerApplications

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: [email protected]

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

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

MaterialAuthorization (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 respon-

sible for any incidental or consequential damages or loss of profits or goodwill.

Communications Specialties shall not be obligated to replace or repair equip-

ment that has been damaged by fire, war, acts of God, or similar causes, or

equipment that has been serviced by unauthorized personnel, altered, improp-

erly installed or abused.

RMA numbers and repairs can be obtained from:

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:[email protected]

Please have your serial number available when contacting us.

Communications Specialties, Inc.

55 Cabot Court

Hauppauge, N.Y. 11788 USA.

Tel: (631) 273-0404 Internet: www.commspecial.com

FAX: (631) 273-1638 Email: [email protected]

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.

The FIBERLINK XRD-8050 has been manufactured using the latest semiconduc-

tor 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 tele-

phone 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.

MAINTENANCE

12-18 Volts AC*

12-18 Volts DC*

GENERAL INFORMATION

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

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 accommo-

date 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 stand-

alone 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.

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 single-

mode 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?

Functional Block Diagram of XRD-8050 and XRD-8050/RK

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 intercon-

nections 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.

OVERALL SYSTEM CHECKOUT AND TROUBLE-

SHOOTING TECHNIQUES

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.

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.

US Government regulations require that all equipment using Laser Diodes be

clearly identified with appropriate warning labels. Be sure to heed these labels.

NEVER LOOK DIRECTLY AT AN OPERATING

LASER DIODE, REGARDLESS OF THE

OPERATING WAVELENGTH

INSTALLATION INSTRUCTIONS FOR XRD-8050

Installation Procedure

The following procedure is intended to simplify the installation of the XRD-

8050 unit. Be sure to follow all steps carefully and to double check all connec-

tions. 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 appropri-

ate 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.

All that is required for normal operation of the FIBERLINK XRD-8050 stand-

alone 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.

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.

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. Multi-

mode 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.

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 compat-

ible with the equipment being used. All signal connections are made via an

industry standard DB-25S connector.

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

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.

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.

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:

Optical Fiber Compatibility

Various versions of the XRD-8050 will successfully operate with most multi-

mode 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

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

• 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.

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.

INTERFACE TROUBLESHOOTING

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.

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.

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.

INSTALLATION INSTRUCTIONS FOR XRD-8050/RK

(Rackmountable 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.