TREND NETWORKS LTX-5520 User manual

LTX-552X
Digital Fiber
Optic Link
Manual
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Manual
LTX-552X Fiber Optic Link
Topic Page
GENERAL INFORMATION
Introduction................................................................................................................................3
Quick Start.................................................................................................................................4
Specifications............................................................................................................................5
Unpacking and Inspection....................................................................................................6
Power Considerations............................................................................................................6
Descriptions...............................................................................................................................7
Theory of Operation...............................................................................................................7
Operational Considerations..................................................................................................8
Warranty and Repair Information.......................................................................................9

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Introduction
LTX-552X Fiber Optic Link
INTRODUCTION
The LTX-5520/5525 Electrical to Optical and Optical to Electrical Converter system comprise a
convenient product that is intended to transmit 16 independent channels of digital information to
a remote location via fiber optic cable. Its primarily designed to be used in those situations where
the signals to be transmitted have a high common mode voltage with respect to the receiving
equipment. Such situations arise in plasma physics experiments, power transmission equipment,
EMC chambers and high power laser systems. Trigger information from electrically noisy sources
such as high current discharge laser systems may be transmitted without conducting Electro-
Magnetic Interference, (EMI) to the measurement or control equipment.
The system transmits all sixteen digital input channels simultaneously. The data rate of each
channel may range from 0 to 24 (50) mega bits per second. The digital inputs accept TTL, CMOS
or LVTTL levels and output LVTTL levels, i.e. 0 to 3.3V for a logic zero and logic one respectively.
The signal sense is non-inverting.
FEATURES AND BENEFITS
• Channel capacity up to 50 Mb/S
• Outputs are LVTTL (0 - 3.3 V)
• Accepts LVTTL and/or CMOS/TTL inputs
• 1310 nm version for SM links up to 10 KM
• 850 nm version for multimode links up to 500 Meters
• Transmits 16 independent TTL signals over a single fiber
• Paired with LTX-551x to configure remote high speed
12 or 14-bit A/D and D/A converter modules
MADE IN THE USA

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Quick Start
LTX-552X Fiber Optic Link
Quick Start Page
1. Connect a multimode (single mode for 1310 nm ver.) fiber optic patch cord between
the ST connectors on the rear panels of the LTX-552XT (transmitter) and the LTX-552XR
(receiver).
2. Set the transmitter controls as follows: POWER - O
3. Set the receiver controls as follows: POWER - O
4. Connect the power supply plugs to the connector on the back of each unit.
5. Plug the power supplies into a wall socket.
6. Connect the receiver DB-25 connector output pins to an oscilloscope or other device.
(NOTE: The order of steps 7 and 8 is crucial)
7. Switch the receiver power switch to ON.
8. Switch the transmitter power switch to ON.
9. Connect the signal(s) to be transmitted to the appropriate pins of the DB-25 connector.
10. The input signal(s) at the transmitter should now be present at the output of the re-
ceiver.

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Specifications
LTX-552X Fiber Optic Link
LTX-552X-Specifications
LTX-5520 LTX-5525
Number of independent Channels 16
Signal Latency (with one meter of
fiber)
Approximately 300 ns
Input Impedance 50 Ohms or 1 Megohm || 20 pF, selectable
Output Drive Capability +/- 5 V open circuit, +/- 2 V into 50 ohm load
Output Impedance 50 Ohms
Digital Inputs TTL, LVTTL, CMOS compatible
Digital Outputs LVTTL (0 - 3.3 V)
Digital switching Rates 0-12.5 MHz (up to 24 Mb/s) 0-24 MHz (up to 48 Mb/s)
Digital Signal Edge Uncertainty 0 - 20 ns 0 - 10 ns
Laser Wavelength 850 nm+/- 20 nm or 1310 nm +/- 20 nm
Optical Transmission Rate 1.0 Gb/S 2.0 Gb/S
Loss Budget 15 dB max
Optical Return Loss > 15 dB
Laser Safety Classification Class I safety per FDA/CDRH and IEC-825-1 regulations
Typical Trans. Distances MM 500 M - 50/125µand 300 M -
62.5/125µ
250 M - 50/125µand 150 M -
62.5/125µ
Typical Trans. Distances SM 10 KM with 9/125 micron fiber
Fiber Optic Connectors ST standard, FC optional
Signal Connectors DB25 on input and output
Power Requirements 9 VDC (Optional 9 - 24 VDC, 500mA)
Power Supply Included 95 - 260 VAC, 50 - 60 Hz, 16 VA Max - Output 9VDC/.67A with
Universal, US, UK, Continental Europe and Australian plugs included
LED Annunciators Provided Input Overload ( transmitter ), Optical Signal - ON ( receiver )
Operating Temperature 0 - 40 C
Tx and Rx Dimensions 175 L x 105 W x 40 H
Weight (each) 0.46 Kg
Standard Warranty Two Years, Components and Workmanship, 30 day Satisfaction
Guarantee
Accessories Supplied DB25 Connectors for Digital Inputs/Outputs and Power Supply
With International Mains

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UNPACKING AND INSPECTION
Prior to shipment this instrument was inspected and found to be free of mechanical and
electrical defects. Upon acceptance by the carrier he assumes responsibility for its safe
arrival. After unpacking, examine the unit for any evidence of shipping damage. Should
you receive this instrument in a damaged condition, apparent or concealed, it must be
noted on the freight bill or express receipt and signed by the carrier’s agent. Failure to
do so could result in the carrier refusing to honor the claim. Upon filing a claim TREND
Networks should be notified.
POWER CONSIDERATIONS
The LTX-552X T and R operate from a regulated 9 VDC wall-mount power supply. These
power supplies operate with line voltages ranging from 95 to 260 VAC, 50-60 Hz. Four
interchangeable power line connectors are supplied that are compatible with connectors
used in North America, Continental Europe, Australia, and the United Kingdom. Do not use
with any other wall-mount supply or damage may result.
Unpacking and Inspection
LTX-552X Fiber Optic Link
LTX552X Transmitter
Digital Input
Connector
(DB-25)
Power Switch
Rear Panel of LTX-552X-T
DC Power
Jack
9VDC
Fiber Op-
tic Output
(ST)

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THEORY OF OPERATION
The LTX-552XT samples the 16 digital inputs presented at the front panel DB-25 connector
at a 50 (100) MS/s rate to form a sixteen bit digital word. This word is converted to an
8b/10b code and transmitted as a twenty bit word. This process is repeated at a 50
(100) MHz rate resulting in a 1 (2) Gb/s data stream. This data is converted to an optical
bitstream and transmitted via a user-supplied optical fiber to the LTX-552XR receiver.
The LTX-552XR receives the optical bitstream and converts it to a digital signal. It then
decodes and de-multiplexes this data. The original 16 bits are latched and presented at
the digital output ports. The system is intended to be used with 50/125 uM or 62.5/125 uM
fiber optic cable. (The LTX-552X-1310 is intended for use with single mode fiber).
Upon energizing the LTX-552XT it transmits framing characters for a few seconds so that
the receiver can determine where a valid word in the data stream begins and ends. The
receiver is phase-locked to the transmitters data rate and will remain so unless the optical
signal is disrupted in some fashion such as removing an optical fiber or power to one of
the units.
Descriptions/Theory of Operation
LTX-552X Fiber Optic Link
Digital Output
Connector
(DB-25)
Optical
Signal
Indicator
Power Switch
Rear Panel of LTX-552X-R
DC Power
Jack
9VDC
Fiber Op-
tic Input
(ST)
LTX552X Receiver

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OPERATIONAL CONSIDERATIONS
The LTX-552X system may be used to transmit signals from a source that is distant or at a
dierent ground potential with respect to measuring devices such as an oscilloscope. The
input digital signals may be TTL, CMOS or LVTTL levels. The output signals are LVTTL
( 0-3.3 V).
The power supply for the unit must be at roughly the same potential of the signal common
mode voltage. For example, using the unit at a 10 000 V potential while it is utilizing the
wall mount power supply at conventional line potential will result in a hazardous situation
and certain damage to the equipment. An isolation transformer with sucient isolation
voltage rating must be used to power the wall mount supply.
The length of fiber optic cable that may be used is typically 300 M for 62.5/125 um fiber or
500 M for 50/125 um fiber. Fiber bandwidth and not loss is typically the limiting factor for
range with multimode units. The single mode version is limited by loss. Typical ranges of 10
km may be achieved with this model using single mode fiber.
When setting up the LTX-552X system, note that the transmitter must be turned on last!
This allows the receiver to detect the synchronizing framing characters. Meaningless
signals will otherwise be generated. Should sync be lost by disconnecting the optical fiber,
simply turn the transmitter o and then back on.
Do not connect active signals to the transmitter input prior to energizing the unit. Doing
so may interfere with the framing sequence that is initiated during power-on-reset. This
will result in erroneous data transmission. The green LED on the receiver indicates that the
receiver is operating with an adequate optical input signal. If the indicator goes dark, the
transmitter has lost power or the connecting fiber is disconnected or broken.
The controls and their functions are indicated on the following pages.
The input and output pin-outs of the input DB-25 connectors are shown below.
DIGITAL INPUT/OUTPUT
CONNECTIONS
Digital Ground
Chan. 5
Chan. 2
Chan. 4
5
3
4
2
1
Chan. 3
PIN FUNCTION
6 Data10
7 Data12
8 Data14
9 NC
10 Ground
PIN FUNCTION
1 Data0
2 Data2
3 Data4
4 Data6
5 Data8
PIN FUNCTION
11 Ground
12 Ground
13 Ground
14 Data1
15 Data3
PIN FUNCTION
16 Data5
17 Data7
18 Data9
19 Data11
20 Data13
PIN FUNCTION
21 Data15
22 Ground
23 Ground
24 Ground
25 GND(Xmtr)
Clock out (RCVR)
Operational Consideration
LTX-552X Fiber Optic Link

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Warranty and Repair
LT-880 Laser Tachometer
WARRANTY AND REPAIR INFORMATION
REPAIR INFORMATION
Products manufactured by TREND Networks are designed and manufactured to provide
reliable performance. However, in the event that service is required, both telephone
technical assistance and factory repair services are available. Call [phone], e-mail
[e-mail] or visit our web site at https://www.trend-networks.com/
us/ for more information or to request an RMA number.
For IN-WARRANTY REPAIRS, call us to obtain a Returned Material Authorization number,
(RMA Number). All products are to be returned to TREND Networks with freight charges
pre-paid. Those products sent under warranty will be returned to our customers pre-
paid. We cannot be responsible for returned products that do not reference the TREND
Networks RMA number.
For OUT-OF-WARRANTY repairs, services are billable for both time and materials.
LIMITED WARRANTY
TREND NETWORKS WARRANTS THAT TO THE FIRST PURCHASER, FOR A PERIOD OF TWO
YEARS FROM THE DATE OF RECEIPT, THAT THIS PRODUCT (THE PRODUCT) WILL BE FREE
FROM DEFECTS IN MATERIALS AND MANUFACTURING. THE FOREGOING WARRANTY IS
THE ONLY WARRANTY, EXPRESS OR IMPLIED, GIVEN BY TREND NETWORKS, I.E., THERE IS
NO WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE. TREND NETWORKS HEREBY
DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OTHER THAN THE WARRANTY IN THE
FIRST SENTENCE TO THE FULLEST EXTENT PERMITTED BY LAW.
THE SOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY IS REPAIR OR REPLACEMENT
AT TREND NETWORKS’ OPTION OF ANY PRODUCT THAT PROVES TO BE DEFECTIVE IN
MATERIALS OR MANUFACTURING WITHIN TWO YEARS OF RECEIPT OF THE PRODUCT.
NOTE: THIS WARRANTY DOES NOT APPLY TO ANY PRODUCT WHICH HAS BEEN SUBJECT TO
MISHANDLING, MISUSE, OR SERVICE BY UNAUTHORIZED PERSONNEL OR TO ANY PRODUCT
WHICH HAS BEEN DAMAGED, MODIFIED, ALTERED OR TAMPERED WITH.
TO THE FULLEST EXTENT OF THE LAW, TREND NETWORKS DISCLAIMS ALL LIABILITY FOR
ANY OTHER DIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES ALLEGED TO BE CAUSED
BY A DEFECTIVE PRODUCT, I.E., TREND NETWORKS WILL NOT BE RESPONSIBLE FOR ANY
PERSONAL INJURY, PROPERTY DAMAGE OTHER THAN THE COST OF REPLACING THE
PRODUCT OR ANY OTHER MONETARY DAMAGE SUCH AS LOST WAGES OR PROFITS CAUSED
BY ANY USE, ATTEMPTED USE OR INABILITY TO USE THE PRODUCT. NOTE: BY USING THE
PRODUCT, YOU AGREE THAT REPAIR OR REPLACEMENT AT TREND NETWORKS’ OPTION
WILL FULLY SATISFY TREND NETWORKS’ WARRANTY OBLIGATION TO YOU, WHETHER IN
CONTRACT, TORT, NEGLIGENCE, STRICT LIABILITY OR OTHER APPLICABLE LAW.

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Tel. [phone]
[e-mail]
Specification subject to change without notice. E&OE
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