7320 Interfacility Link
Installation and User’s Guide
Copyright 2000
7320 IFL Installation and User’s Guide
Corporate Headquarters
600 College Road East
Princeton, New Jersey 08540
USA
Tel: 609-514-1800
Toll Free: 1-866-OnePath
Fax: 609-514-1881
Research and Development
Beck Science Center
8 Hartom Street, Har-Hotzvim
P.O. Box 45092
Jerusalem 91450
Israel
Tel: +972-2-589-9888
Fax: +972-2-589-9898
Website: www.onepathnet.com
e-mail: corporate@onepathnet.com
This manual contains PROPRIETARY and CONFIDENTIAL information of OnePath
Networks Inc. Reproduction, release to any third party, or any other unauthorized use, of any
information contained herein is expressly prohibited.
Foxcom Proprietary Information 2
Document No. 93-005-28-C
7320 IFL Installation and User’s Guide
Table of Contents
1. Front Chapter.......................................................................................................................5
1.1 Warranty and Repair Policy.............................................................................................5
1.2 Reporting Defects.............................................................................................................6
1.3 Certification .....................................................................................................................7
1.4 Conventions .....................................................................................................................7
1.5 Precautions.......................................................................................................................7
2. Introduction to the 7320 IFL...............................................................................................9
2.1 Options.............................................................................................................................9
2.2 Product Drawings...........................................................................................................10
2.3 Block Diagrams..............................................................................................................11
3. Set Up..................................................................................................................................12
3.1 Setting Up ......................................................................................................................12
3.2 Panel Descriptions..........................................................................................................17
4. Product Technical Description .........................................................................................18
4.1 7320 IFL Specifications.................................................................................................18
4.2 Alarm Pinouts ................................................................................................................19
4.3 Model Dimensions.........................................................................................................22
5. Manual Gain Control ........................................................................................................23
5.1 Transmitter Gain Control...............................................................................................23
5.2 Receiver Gain Control ...................................................................................................23
6. Trouble Shooting................................................................................................................24
7. Appendix I Cleaning Fiberoptic Connections.................................................................26
8. Appendix II Installing a Standalone Unit........................................................................26
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List of Figures
Figure 1 - System 7320 Transmitter Front and Rear Panels....................................................10
Figure 2 - System 7320 Receiver Front and Rear Panels.........................................................10
Figure 3 - Transmitter Block Diagram.....................................................................................11
Figure 4 - Receiver Block Diagram.........................................................................................11
Figure 5 - Basic Setup of a System 7320.................................................................................12
Figure 6 - System 7320 Transmitter Pinout.............................................................................20
Figure 7 - System 7320 Receiver Pinout..................................................................................21
List of Tables
Table 1 - 7320 Transmitter LEDs............................................................................................17
Table 2 - 7320 Receiver LEDs.................................................................................................17
Table 3 - 7320T Transmitter Pinout.........................................................................................20
Table 4 - 7320R Receiver Pinout.............................................................................................21
Table 5 - Receiver RF Signal Voltage .....................................................................................23
Table 6 - Trouble Shooting......................................................................................................24
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1. Front Chapter
Front Chapter
1.1 Warranty and Repair Policy
Foxcom performs testing and inspection to verify the quality and reliability of our
products. Foxcom uses every reasonable precaution to ensure that each unit meets
specifications before shipment. Customers are asked to advise their incoming
inspection, assembly, and test personnel as to the precautions required in handling and
testing our products. Many of these precautions are to be found in this manual.
Nullification of Warranty
The Warranty is null and void if the product casing is opened.
The products are covered by the following warranties:
A) General Warranty
Foxcom warrants to the original purchaser all standard products sold by Foxcom
to be free of defects in material and workmanship for one (1) year from date of
shipment from Foxcom. During the warranty period, Foxcom will repair or
replace any product that Foxcom proves to be defective. This warranty does not
apply to any product which has been subject to alteration, abuse, improper
installation or application, accident, electrical or environmental over-stress,
negligence in use, storage, transportation or handling.
B) Specific Product Warranty Instructions
All Foxcom products are warranted against defects in workmanship, materials
and construction, and to no further extent. Any claim for repair or replacement of
units found to be defective on incoming inspection by a customer must be made
within 30 days of receipt of shipment, or within 30 days of discovery of a defect
within the warranty period.
This warranty is the only warranty made by Foxcom and is in lieu of all other
warranties, expressed or implied. Foxcom sales agents or representatives are not
authorized to make commitments on warranty returns.
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C) Returns
In the event that it is necessary to return any product against above warranty, the
following procedure shall be followed:
1. Return authorization is to be received from Foxcom prior to returning
any unit. Advise Foxcom of the model, serial number, and discrepancy.
The unit may then be forwarded to Foxcom, transportation prepaid.
Devices returned collect or without authorization may not be accepted.
2. Prior to repair, Foxcom will advise the customer of our test results and
any charges for repairing customer-caused problems or out-of-warranty
conditions etc.
3. Repaired products are warranted for the balance of the original warranty
period, or at least 90 days from date of shipment.
D) Limitations of Liabilities
Foxcom's liability on any claim, of any kind, including negligence for any loss or
damage arising from, connected with, or resulting from the purchase order,
contract, quotation, or from the performance or breach thereof, or from the
design, manufacture, sale, delivery, installation, inspection, operation or use of
any equipment covered by or furnished under this contact, shall in no case exceed
the purchase price of the device which gives rise to the claim.
Front Chapter
EXCEPT AS EXPRESSLY PROVIDED HEREIN, FOXCOM MAKES NO
WARRANTY, EXPRESSED OR IMPLIED, WITH RESPECT TO ANY
GOODS, PARTS AND SERVICES PROVIDED IN CONNECTION WITH
THIS AGREEMENT INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE. FOXCOM SHALL NOT BE LIABLE FOR
ANY OTHER DAMAGE INCLUDING, BUT NOT LIMITED TO,
INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF OR IN CONNECTION WITH FURNISHING OF GOODS,
PARTS AND SERVICE HEREUNDER, OR THE PERFORMANCE, USE
OF, OR INABILITY TO USE THE GOODS, PARTS AND SERVICE.
1.2 Reporting Defects
The units were inspected before shipment and found to be free of mechanical and
electrical defects. Examine the units for any damage which may have been caused in
transit. If damage is discovered, file a claim with the freight carrier immediately.
Notify Foxcom as soon as possible.
Note
Keep all packing material until you have completed the inspection.
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1.3 Certification
The 7320 IFL has CE, FCC, FDA, and UL certification.
1.4 Conventions
In this manual the following special formats are used:
Note
Notes contain information detailing the current topic.
CAUTION
Cautions contain information regarding situations or materials which could
damage your product.
WARNING
Front Chapter
WARNINGS CONTAINS INFORMATION REGARDING DANGEROUS
FUNCTIONS.
1.5 Precautions
1.5.1. Personal Safety
WARNING
OPTICAL RADIATION
APPLYING POWER TO THE TRANSMITTER UNIT WILL CREATE A
LASER ENERGY SOURCE OPERATING IN CLASS I AS DEFINED BY
IEC 825-1. USE EITHER AN INFRARED VIEWER, OPTICAL POWER
METER OR FLUORESCENT SCREEN FOR OPTICAL OUTPUT
VERIFICATION.
AC POWER HAZARD
THE RACKMOUNT POWER SUPPLY LINE IS EMI FILTERED AND
FUSED. THE CHASSIS IS CONNECTED TO EARTH GROUND IN
COMPLIANCE WITH SAFETY REQUIREMENTS. ALWAYS USE THE 3
PRONG AC PLUG WITH EARTH GROUND TO AVOID POSSIBILITY OF
ELECTRICAL SHOCK HAZARD TO PERSONNEL.
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1.5.2. Equipment Safety
To avoid damaging your product, please observe the following:
1. Fuses: To avoid possibility of fire hazard, always replace fuses with the
same type and rating of fuse as recommended on the power supply rear
label.
2. The input of the transmitter has an optional built-in bias for inserting DC
power up the coax to the LNB. Make certain any equipment or test
equipment connected to the transmitter input can withstand this bias.
3. The output of the receiver is AC coupled and can withstand the bias from a
satellite receiver. Do not exceed 25V DC bias.
4. Do not allow any dirt or foreign material to get into the optical connector
bulkheads. This may cause damage to the polished optical connector end
faces.
5. The optical fiber jumper cable bend radius is 3 cm. Smaller radii can cause
excessive optical loss and/or fiber breakage.
Front Chapter
6. If multiple transmitters are installed in the chassis allow sufficient room for
adequate ventilation; otherwise the units may overheat causing possible
safety hazard or equipment damage.
7. When several units are installed on one 7000M chassis, ensure that the total
units’ current (including any LNB bias) does not exceed 2A per power
supply (e.g. if there are two power supplies the current should not exceed
4A.)
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Introduction to the 7320 IFL
2. Introduction to the 7320 IFL
The Sat-Light 7320 IFL transmits an L-Band RF signal over singlemode fiber from a
satellite antenna LNB to control room equipment up to two kilometers away. The 7320 IFL
consists of an optical transmitter (7320T) which receives the L-Band signal from the LNB
and an optical receiver (7320R) which connects to a satellite receiver.
The 7320T and 7320R modules plug into a 7000M 3U chassis/power supply which enables
expansion of the system to accommodate any 6 Sat-Light modules. Accessories include the
Model 7000S Standby Power Supply, the Model 2000 1:1 Redundant Switch, the Model
2100 Amplifier, and the Model 7050-4 Serial Data Multiplexer, an asynchronous data link.
The 7320 IFL is a broadband transmission link; all standard satellite modulation formulas can
be transmitted (i.e. QPSK, FM, etc.).. The RF signal is directly modulated and adds virtually
no phase noise to the original signal. The direct modulation, coupled with the 7320 Links RF
circuitry, guarantees superior signal quality. The 7320 gives more than 25 dB carrier to noise
performance in a full multichannel environment.
Gain Control provides for optimization of the RF signal. LEDs, and back panel monitors and
alarms allow for complete system status monitoring and for interfacing with M & C systems.
2.1 Options
The 7320 IFL comes with a variety of options:
1. LNB powering - The transmitter unit can provide 15 VDC for optional LNB
powering.
2. 50 Ω Input/Output Impedance/BNC RF connector. Standard impedance is
75 Ω/F type, female connectors are standard.
3. Standalone unit - The 7320 IFL can be installed as a standalone unit. If the 7320
is used as a standalone, a separate power supply must be used.
On the side of the 7320T and the 7320R units is a sticker1 which lists options 1 & 2.
Under each option is a square. If the unit includes a particular option the square under
the option should be marked. For example in Figure 1 the LNB option is marked.
Options
1550 LNB
50
25
Figure 1 - Option Sticker
1
The sticker includes options which are not relevant to the 7320 IFL.
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Introduction to the 7320 IFL
2.2 Product Drawings
Figure 2 shows the front and rear panels of the System 7320 Transmitter units.
7320T
Figure 2 - System 7320 Transmitter Front and Rear Panels
Figure 3 shows the front and rear panels of the System 7320 Receiver units.
7320R
Figure 3 - System 7320 Receiver Front and Rear Panels
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2.3 Block Diagrams
Optical Power &
Temperature
Control
Introduction to the 7320 IFL
PreAmp
Laser
Figure 4 - Transmitter Block Diagram
The 7320T Transmitter accepts RF input signal levels ranging from -40 to -20 dBm
total power (i.e. at 10 channel loading this is equivalent to -50 to -30 dBm per
channel). The unit amplifies the signal, and feeds it to a laser diode which linearly
converts the broadband RF signal to light intensity.
Bias &
Optical Power
Monitor
Power & Monitors
Photodiode
Preamp
Gain
Control
Postamp
Output
Figure 5 - Receiver Block Diagram
The 7320R Optical Receiver receives the optical intensity signal, and linearly converts
the signal back to RF. The Receiver then amplifies and reproduces the L-Band RF
signal.
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7320 IFL Installation and User’s Guide
3. Set Up
The following section details:
• How to setup the System 7320 units
• The System 7320 Front Panels
3.1 Setting Up2
Setting up the System 7320 Transmitters and Receivers consists of the following steps:
1. Setting up the transmitter.
2. Connecting the fiberoptic cable.
3. Setting up the receiver.
4. Monitoring the input/output signals.
5. Power requirements.
Set Up
Observe all warnings and cautions mentioned at the beginning of this manual (page 7).
If after set-up you experience problems, refer to Trouble Shooting on page 24.
Figure 6 - Typical Application of a 7320 Link
2
This section gives instructions on installing the transmitter and receiver in a chassis rackmount. For
instructions on installing a standalone unit refer to Appendix II Installing a Standalone Unit.
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3.1.1. Setting Up the Transmitter
1. Place the 7320T in the 7000M Chassis. The operating base plate
temperature must be between -10° C to 55° C.
2. Apply AC power to the chassis. The Power Supply’s LED should be lit.
3. Mount the 7320T into the chassis. The Laser LED should be lit.
4. Using an optical power meter, measure the optical power. Insert the meter’s
cable into the Transmitter’s optical connector. Power levels should be
between 0.3 - 1 mW.
Alternatively, use a DVM to measure the voltage at pin #6 on the back panel
connector. The power level should be -4.5 ± 0.3 VDC.
5. On the rear panel, connect the coax cable to the RF Input Connector.
6. On the rear panel, connect the fiberoptic cable to the Optical Connector.
Note
If either LED is not lit, refer to Trouble Shooting on page 24.
Set Up
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3.1.2. Connecting the Fiberoptic Cable
Before connecting the cable:
1. The fiberoptic cable must be either fusion spliced or connected via FC/APC
connectors.
2. Wipe the connector with a lint-free cotton cloth.
3. Note the polarity key of the optical connector before inserting.
To connect the cable:
1. Line Up the Polarity Key.
2. Insert the connector.
FC/APC
Set Up
3. Tighten the connector.
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3.1.3. Setting Up the Receiver
1. Place the 7320 Receiver in the 7000M Chassis. The operating base plate
temperature must be between -10° C to 55° C.
2. Apply AC power to the chassis. The Power Supply’s LED should be lit.
3. Mount the 7320R into the chassis.
4. On the rear panel connect the fiberoptic cable to the Optical Connector. The
Opt. LED should be lit.
5. Using an optical power meter, measure the optical power coming to the
Receiver from the fiberoptic cable. The power levels of the Receiver should
be the power level measured at the Transmitter minus the fiber loss3.
Alternatively, use a DVM to measure the voltage at pin #6 of the
D type connector. The power level should be 1V to each 1 mW measured at
the Receiver input.
6. On the rear panel, connect the fiberoptic cable to the Optical Connector.
The Opt. LED should be lit.
Set Up
7. On the rear panel, connect the coax cable to the RF Output Connector.
Note
If either LED is not lit, refer to Trouble Shooting on page 24.
3.1.4. Measuring the RF Signal Strength
The Receiver’s RF signal strength can be monitored during operation via a DC
RF signal-strength monitor. Maintenance personnel can perform a simple
verification process.
To measure the RF signal strength:
1. Using a Digital Volt Meter, measure the voltage at the connector pin #4
(both Rackmount or Standalone).
2. Refer to Manual Gain Control on page 23 for further details regarding
voltage levels.
3
Fiber loss is defined as:
(0.4 dB/km x length (km) of the fiberoptic cable) + (0.5 dB x number of connectors).
For example if a link was 10 kilometers long and had two connectors the loss would be:
(0.4 dB/km x 10 km) + (0.5 dB x 2) = 5.0 dB.
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3.1.5. Powering the IFL
• Transmitter power requirement - 15VDC @ 300 mA (excluding LNB Drive
Option)
• Receiver power requirement - 15VDC @ 230 mA
• The Standalone Transmitter/Receiver can be powered by a Foxcom-supplied
external DC power supply.
• The Rackmount Transmitters/Receivers are plugged into the 7000M
rackmount chassis. The chassis can accept and power up to six units.
Note
At temperatures below 10
additional 100 mA. The Transmitter’s total power requirement will then be
400 mA.
CAUTION
Ensure that there is a good airflow around the chassis rackmount.
°
C, the Transmitter’s internal heater will require an
Set Up
7000M Chassis
The 7000M Chassis provides power to the plug in units. The power supply is
a linear unregulated type. Each plug in unit regulates its own voltage. The
7000M provides:
• 15 -18 VDC (unregulated) @ 2.2 amps power
• AC input @ 110/220 VAC (user selected)
• Units can be plugged in “hot standby”
• An internal 5 amp fuse
7000S (optional) Hot standby power supply
For applications demanding the utmost in reliability and uptime, the 7000S
standby power supply can be optionally plugged in to the standard chassis. The
7000S features hot swapping - supplies may be installed and removed even
during operation. Each power supply is fully redundant and can power a
completely loaded chassis on its own should its "partner" fail. During normal
operation the two units share the load by means of current steering diodes
located on the rear panel.
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3.2 Panel Descriptions
On the Front Panel of the 7320 Transmitter and Receiver unit are two LEDs. The
following tables describe the LEDs.
Table 1 - 7320 Transmitter LEDs
LED Name LED Function
Set Up
Laser
RF
Indicates if the optical output power control is functioning
Indicates if the RF signal is above the minimal level
Table 2 - 7320 Receiver LEDs
LED Name LED Function
Opt.
RF
Indicates if the optical reception power is within limits
Indicates if the RF signal is above the minimal level
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4. Product Technical Description
• 7320 IFL specifications
• Alarm and Monitor Pinouts
• Model Dimensions
• 7320 IFL Front Panels
4.1 7320 IFL Specifications
Product Technical Description
RF Characteristics
Frequency Range
Flatness
Input/Output Impedance
Input VSWR
Output VSWR
Input Signal Range (Total Power)
Output Signal Range (Total Power)
CNR
Link Gain
Gain Control
RF Connector
Optical Characteristics
Optical Wavelength
Optical Power Output
Optical Link Budget
Optical Connector
Receiver Sensitivity
Miscellaneous
Chassis Capacity
Chassis Size
Plug-in Unit size
Power for Chassis
Power for Standalone
Transmitter
Receiver
Operating Temperature Range
Storage Temperature
950 -2150 MHz
± 2.0 dB (typical); ± 2.5 dB (max.)
75 Ω (50 Ω optional)
2:1 (max.)
2:1 (max.)
-40 to -20 dBm
-45 to -15 dBm
>30 dB in 35 MHz BW (single channel)
adjustable ± 10 dB
Manual
F type female (BNC - optional)
1310 ± 10 nm
0.2 - 0.5 mW
3 dB/ 2 km (min.)
FC/APC (or fusion splice)
-9 dBm optical (min.)
6 plug-ins
19” x 3U x 7”
5.1” x 4.9” x 1.6”
110 or 220 VAC
15 VDC @ 300 mA (max.)
(400 mA < 100 C)
15 VDC @ 210 mA (max.)
-10° C to 55° C
-20° C to 85° C
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Product Technical Description
4.2 Alarm Pinouts
The unit’s pins are found at the backplane of the 7000M chassis. The 7000M
backplane incorporates 6 slots, each of which has its own 6 pin blank header associated
with it. Any monitor voltages to be measured may be done between the chassis ground
and the required pin. The pins are numbered as follows:
6
5
4
3
2
1
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Table 3 - 7320T Transmitter Pinout
Product Technical Description
Standalone
9 Pin
Connector
Rackmount 6
Pin Back Panel
Connector
Function Description
1 +15V Power 300 mA4 (excluding LNB Option)
2 Not Used
3 Power Ground DC Return
4 4 RF Signal Strength
Monitor
RF Signal Strength Indicator;
Range 2 - 10V
5 6 PDI Measures Laser Optical Power;
Range -3.0 to -4V
6 1 LSRI Measures Laser Bias;
Range -4.5 ± 0.2V
7 2 RF Alarm Open collector interface. Sinks
current when RF level is low.
8 3 LSR Alarm Open collector interface. Sinks
current when optical level is low.
9 5 LNB Bias (optional) External LNB Bias
7320T Transmitter
9 Pin D-Type Male Connecter
RF Signal Strength Monitor
Laser Photodiode Current Monitor
Laser Current Monitor
AGC Alarm
Figure 7 - System 7320 Transmitter Pinout
4
400 mA below 100 C
Not Used
LSR Alarm
1
2
3
4
5
6
7
8
9
+15V Power
Power Ground
External LNB Bias
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Table 4 - 7320R Receiver Pinout
Product Technical Description
Standalone
9 Pin
Connector
Rackmount 6
Pin Back Panel
Connector
Function Description
1 +15V 230 mA
2 Not Used
3 Power Ground DC Return
4 4 RF Signal Strength
Monitor
5 6 Optical Power Input Level
RF Signal Strength Indicator;
Range 0.25 to 2V
1V/mW Optical Power Received
Monitor
6 1 Spare Not Used
7 2 RF Alarm Open collector interface. Sinks
current when RF level is low.
8 3 Optical Power Alarm Open collector interface. Sinks
current when optical level is low.
9 5 Spare Not Used
7320R Rece ive r
9 Pin D-Type Male Connecter
Not Used
RF Signal Strength Monitor
Optical Power Monitor
Not Used
AGC Alarm
Optical Alarm
Not Used
1
2
3
4
5
6
7
8
9
+15V Power
Power Ground
Figure 8 - System 7320 Receiver Pinout
CAUTION
When monitoring the voltage outputs use only a high resistance DVM.
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O
4.3 Model Dimensions
Product Technical Description
ptical
0.0 6"
Figure 9 - Unit Dimensions
RF Test
Gain
Control
4.9 "
RF
4"
3.6 9"
3"
DC Power
0.12“
FRONT VIEW
1.52’‘
“
REAR VIEW
Figure 10 - Chassis Dimensions
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Manual Gain Control
5. Manual Gain Control
All internal adjustments have been set up at the factory; the only user adjustments are input
and output RF signal levels accessible from the front panel and described in the following
sections.
5.1 Transmitter Gain Control
Since MGC sets a constant input gain to the laser, an initial setup is required to ensure
the input signal level is not too high (over-driving the laser) or too low (noisy). These
variations can be caused by changes in dish pointing, rain fade or satellite channel
loading, or any other reason.
To prevent under-driving or over-driving the laser the signal level must be between 2 to
5VDC.
To set the Transmitter MGC:
1. Adjust the MGC potentiometer while monitoring the RF signal voltage. The 7320
IFL is designed to provide optimal output at 2.5V ± 0.5V. Therefore regardless of
the input the Manual Gain Control should be set to provide this output.
2. If there is input signal level variation expected, it is best to leave some
"headroom" should the signal level become too strong and result in distortion. It is
usually better to adjust the signal lower rather than higher.
5.2 Receiver Gain Control
Receiver Gain Control allows the user to set the output signal levels. The Gain
potentiometer is adjusted while monitoring the voltage of the Receiver "RF Sig."
Monitor (Pin #4 on the 6 Pin Connector). The chart below provides approximate
settings for desired output levels.
Table 5 - Receiver RF Signal Voltage
RF Output Level RF Signal Voltage Setting
-15 dBm
-20 dBm
-30 dBm
-35 dBm
9.0V ± 1
4.0V ± 0.5
0.75V ± 0.2
0.225V ± 0.02
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Trouble Shooting
6. Trouble Shooting
The System 7320 was tested before it left the factory. However if you are experiencing
difficulties consult the list below for possible solutions. If your system is still experiencing
problems, please attempt to isolate and identify the malfunctioning unit.
Table 6 - Trouble Shooting
PROBLEM POSSIBLE CAUSE
1. Laser LED not on 1. No DC power to the unit. Possible power supply problem or AC
power input problem. Check the fuse.
2. Verify LSRI monitor is -4.5V ± 0.3. If not, laser may have
overheated. Disconnect power or remove plug in and allow to
cool. Try again with better airflow.
3. If an optical power meter is available, measure the optical power
out of the transmitter. The power should be 0.3 mW to 1 mW. If
an optical power meter is not available, then use another receiver
to determine if there is optical power emerging from the
transmitter (use the 5 meter jumper cable). If there is no optical
power, then the transmitter unit is malfunctioning.
2. Lack of RF signal
present at Receiver, yet
optical power is
functioning.
3. No optical power, LED
not illuminated.
If any or all the above are not within the guidelines, the transmitter
unit is faulty.
1. If the unit has an LNB drive option, verify that the correct
LNB bias is coming down the center of the RF connector at the
transmit site.
2. Verify that the dish is pointed and correctly receiving satellite
signals.
Conclusion: If signal still not present then Transmitter input stage
amplifier is defective. Contact Foxcom.
1. There is a break or severe bend in the fiberoptic cable. Use an
optical power meter or another functioning receiver unit to
verify optical power coming down the fiber.
2. Optical power too low, too many splits, too long a distance (thus
exceeding optical budget). System may still function without
LED illuminated although at reduced performance.
3. The transmitter is not functioning, see above.
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PROBLEM POSSIBLE CAUSE
Trouble Shooting
4. Optical power light
illuminated with
disconnected optical
input.
Damaged (leaky) photodiode. Unit may still function, otherwise
contact Factory for service.
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Appendix I Cleaning Fiberoptic Connections
7. Appendix I Cleaning Fiberoptic Connections
The unit has an FC/APC (or other optional) optical connector for very high optical return loss
performance. The units are specified into singlemode fiber i.e. 9/125 micron core diameter.
Full performance is specified only for low return loss optical plant - meaning that the fiber
must be fusion spliced and all connections or splices must have a return loss greater than -60
dB. With these guidelines in mind, link lengths beyond 20 kilometers. (DFB based products)
can be achieved with high performance. Specific performance and/or design assistance is
available by request from Foxcom.
If there is low/no signal or noisy signal at a Foxcom module, the connector should be
cleaned. Dirt on the inside connector tip can impair the flow of light causing problems in
signal transmission. Foxcom modules are sealed but dirt can occasionally enter.
8. Appendix II Installing a Standalone Unit
To install the 7320T or 7320R Standalone:
1. Place the 7320 unit on the standalone flange, matching the holes.
2. Using four screws (#4 or #6) secure the unit and the flange to the wall.
3. Apply AC power to the standalone power supply unit.
4. Connect the 7320 unit to the power supply. The Laser LED should be lit.
5. All remaining steps are the same. Refer to Setting Up the Transmitter on page 13, and
Setting Up the Receiver on page 15.
Foxcom Proprietary Information 26
Document No. 93-005-28-C
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