JDS Uniphase SK Series User manual

SK SERIES
FIBEROPTIC SWITCH MODULE
User’s Manual

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SD000166 Rev 501 •June 2003
2003 JDS Uniphase. All rights reserved.

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Getting Help
For more information, contact JDS Uniphase or your local sales representative.
Global Sales and Customer Service
Hours: 8:00 am - 8:00 pm ET
Phone: [phone] (Toll Free in North America)
Phone: [phone] (Toll Free International)
E-mail Sales: [email protected]
WWW.JDSU.COM
Instrumentation Customer Support and Service
Emergency technical support is available 24 hours a day, seven days a week:
Phone: [phone], extension 4999
Canada and U.S.: 1-800-406-9559
China: 10800 140 5599
All Other Countries: International Access Code [phone]
E-mail: [email protected]
Please refer to the JDSU Terms and Conditions of Sale for warranty coverage information.

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Contents
Getting Help................................................................................................................................ iii
Global Sales and Customer Service......................................................................iii
Instrumentation Customer Support and Service....................................................iii
Contents ...................................................................................................................................... v
Safety Instructions and Symbols .............................................................................................. 1
Safety Instructions.............................................................................................................1
Before Initializing and Operating the Unit.............................................................. 1
Operating the Switch ............................................................................................. 1
Safety Symbols .................................................................................................................2
General Information and Specifications ................................................................................... 3
General Information .......................................................................................................... 3
Single-Common (SK-C) Switch Configuration....................................................... 3
Key Features ......................................................................................................... 4
Applications ........................................................................................................... 4
Standard Accessories ........................................................................................... 4
Specifications .................................................................................................................... 5
Getting Started ............................................................................................................................ 7
Before Initializing and Operating the Unit.......................................................................... 7
Initial Inspection ................................................................................................................ 7
Operating Environment ..................................................................................................... 7
Temperature.......................................................................................................... 7
Humidity ................................................................................................................ 8
Cleaning Connectors......................................................................................................... 8
Mounting Considerations .................................................................................................. 9
Power Interface Connector ...............................................................................................9
Fiber Exit ......................................................................................................................... 11
Operating and Maintenance Instructions ............................................................................... 13
External Description ........................................................................................................ 13
Connections ....................................................................................................................13
Pin Functional Description .............................................................................................. 14
Data Lines (D0 to D6).......................................................................................... 14
/Reset Input Line ................................................................................................. 16
/Strobe Input Line ................................................................................................ 16
Busy Output Line................................................................................................. 16
Error Output Line................................................................................................. 16
Timing ............................................................................................................................. 16
Timing Key .......................................................................................................... 17
Calibrating the Switch .....................................................................................................17
Maintaining the Switch .................................................................................................... 17
Programming Guide ................................................................................................................. 19

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Testing the Switch........................................................................................................... 19
Programming Examples .................................................................................................. 20
Service ....................................................................................................................................... 21
Storing and Shipping....................................................................................................... 21
Claims and Repackaging ................................................................................................ 21
Returning Shipments to JDS Uniphase............................................................... 21

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Safety Instructions and Symbols
Safety Instructions
The following safety instructions must be observed whenever the unit is operated, serviced, or
repaired. Failure to comply with any of these instructions or with any precaution or warning
contained in the user’s manual is in direct violation of the standards of design, manufacture, and
intended use of the unit. JDS Uniphase assumes no liability for the customer’s failure to comply
with any of these safety requirements.
Before Initializing and Operating the Unit
Inspect the unit for any signs of damage, and read the user’s manual thoroughly.
Install the unit as specified in the Getting Started section.
Ensure that the unit and any devices or cords connected to it are properly grounded.
Operating the Switch
Warning
To avoid the risk of injury or death, always observe the following precautions
before initializing the unit:
• If using a voltage-reducing autotransformer to power the unit, ensure that
the common terminal connects to the earthed pole of the power source.
• Willfully interrupting the protective earth connection is prohibited.
• Never look into the end of an optical cable connected to an optical output
device that is operating. Laser radiation is invisible, and direct exposure can
severely injure the human eye. For more information, see the user’s manual
of the laser source in use.
• Turning off the power to the device does not always block the externally
supplied radiation to the connector at the output of the unit.
• Do not use the unit outdoors.
• To prevent potential fire or shock hazard, do not expose the unit to any
source of excessive moisture.
• Do not operate the unit when its covers or panels have been removed.
• Do not operate the unit if an interruption to the protective grounding is
suspected. In this case, ensure that the unit remains inoperative.
• Unless absolutely necessary, do not attempt to adjust or perform any
maintenance or repair procedure when the unit is opened and connected to
a power source.
• Repairs are to be carried out only by a qualified professional.
• Do not attem
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unit’s internal mechanism if immediate first aid is not accessible.
• Disconnect the power cord from the unit before adding or removing any
components.
• Operating the unit in the presence of flammable gases or fumes is extremely
hazardous.
• Do not perform any operating or maintenance procedure that is not
described in the user’s manual.
• Some of the unit’s capacitors can be charged even when the unit is not
connected to the power source.
Safety Symbols
The following symbols and messages can be marked on the unit (Table 1). Observe all safety
instructions that are associated with a symbol.
Table 1: Safety Symbols
Symbol Description
Laser safety. See the user’s manual for instructions on handling and operating
the unit safely.
See the user’s manual for instructions on handling and operating the unit safely.
Electrostatic discharge (ESD). See the user’s manual for instructions on
handling and operating the unit safely.
Frame or chassis terminal for electrical grounding within the unit.
Protective conductor terminal for electrical grounding to the earth.
WARNING
The procedure can result in serious injury or loss of life if not carried out
in proper compliance with all safety instructions. Ensure that all
conditions necessary for safe handling and operation are met before
proceeding.
CAUTION
The procedure can result in serious damage to or destruction of the unit if not
carried out in compliance with all instructions for proper use. Ensure that all
conditions necessary for safe handling and operation are met before
proceeding.

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General Information and Specifications
General Information
This user’s manual for the SK Series Fiberoptic Switch Module contains complete operating
instructions.
The SK Series Fiberoptic Switch Module (Figure 1) is a modular 1xN controllable switch. The
switch is microprocessor-controlled via a 26-pin parallel interface. It connects a single fiberoptic
channel to any of N (up to 26) channels. Small and rugged, the SK Series switch module is
designed to be used in embedded applications and is available in both single-mode and
multimode versions.
Figure 1: SK Series Fiberoptic Switch
The operation of the switch is based on JDS Uniphase’s proven expanded beam lens
technology using a precision stepper motor to align optical channels. The standard single-pole
configuration consists of a single common port that can be aligned to any one of 26 ports. In
electrical terms, the SK switch is a single-pole, 26-throw switch. The switching mechanism
implements collimating lenses that eliminate problems associated with modal noise and provide
low insertion loss and high repeatability. The use of collimating lenses minimizes insertion loss
and enhances stability and repeatability. The design is optimized for high return loss.
Single-Common (SK-C) Switch Configuration
Figure 2 shows the single-common C configuration of the switch.
Figure 2: SK-C Switch Configuration

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The SK switch operates on a single 5 V ±5% DC power supply and is controlled through a
simple parallel interface consisting of seven data lines, a reset line, a strobe line, and a busy
line.
Key Features
• Up to 26 channels
• Typical insertion loss 0.4 dB
• Typical return loss 60 dB
• Simple parallel interface control
• Compact modular package suitable for original equipment manufacturing (OEM)
Applications
• Remote fiber test systems in telecommunications networks
• Fiber network restoration
• Subsystem integration
• Test and measurement equipment manufacturing
Standard Accessories
• User’s manual

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Specifications
The following optical specifications describe the warranted characteristics of the unit (Table 2).
Supplementary specifications describe the typical non-warranted performance of the unit (Table
3).
Table 2: Optical Specifications
Parameter Typical Maximum
Insertion loss
single-mode1,2
multimode1,2
0.4 dB
0.4 dB
0.7 dB
0.7 dB
Return loss
single-mode2
multimode2
60 dB
25 dB
55 dB (minimum)
20 dB (minimum)
Polarization dependent loss (single-mode) 0.02 dB 0.05 dB
Insertion loss stability3±0.04 dB ±0.06 dB
Repeatability4
sequential switching
random switching
±0.005 dB
±0.01 dB
±0.02 dB
±0.05 dB
Crosstalk (single-mode) -90 dB -80 dB
Input power 300 mW
Switching time
one channel5
each additional channel
75 ms (optical connect time)
15 ms
Control 7-bit parallel TTL interface with /Strobe, /Reset,
busy, error lines
1 Specifications apply for the single-common configuration.
2 Excluding connectors.
3 Drift of any channel relative to one assigned reference channel at ambient temperature ±3 °C over a seven-day period.
4 Optimum repeatability after one hour warm-up.
5 Time between commands is 120 ms.

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Table 3: Other Specifications
Electrical
Input voltage 5.0 ±0.25 V DC typical, 6.0 V DC maximum
Power consumption1 2.20 W steady state
Physical
Dimensions (W x H x D) 79 x 28 x 140 mm
Weight 280 g
Environmental
Operating temperature 0 to 55 °C
Storage temperature -40 to 70 °C
Humidity (non-condensing) maximum 95% RH from 0 to 55 °C
1 Peak current (while switching) at 0 °C is 4.8 W.

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Getting Started
The SK Series Fiberoptic Switch Module consists of the switch and a ribbon cable with a
standard dual row connector.
Before Initializing and Operating the Unit
Inspect the unit for any signs of damage.
 Read the user’s manual thoroughly, and become familiar with all safety symbols and
instructions to ensure that the unit is operated and maintained safely.
Initial Inspection
Warning
To avoid electrical shock, do not initialize or operate the unit if it bears any sign
of damage to any portion of its exterior surface, such as the outer cover or
panels.
Check that the unit and contents are complete:
1. Wear an anti-static wrist strap, and work in an electrostatic discharge (ESD) controlled area.
2. Inspect the shipping container for any indication of excessive shock to the contents, and
inspect the contents to ensure that the shipment is complete.
3. Inspect the unit for structural damage that can have occurred during shipping.
4. Connect a 5 V DC power supply to the switch.
5. Turn on the power.
6. Keep the packaging.
Immediately inform JDS Uniphase and, if necessary, the carrier if the contents of the shipment
are incomplete, if the unit or any of its components are damaged or defective, or if the unit does
not pass the initial inspection.
Operating Environment
In order for the unit to meet the warranted specifications, the operating environment must meet
the following conditions for temperature and humidity.
Temperature
The unit can be operated in the temperature range of 0 to 55 °C.

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Humidity
The unit can be operated in environments with up to 95% humidity (non-condensing, 0 to
55 °C). Do not expose it to any environmental conditions or changes to environmental
conditions that can cause condensation to form inside the unit.
Warning
• Do not use the unit outdoors.
• To prevent potential fire or shock hazard, do not expose the unit to any
source of excessive moisture.
Cleaning Connectors
Caution
• Connecting damaged or dirty fibers to the unit can damage the connectors
on the unit.
• Never force an optical connector. Some connectors have a ceramic ferrule
that can easily be broken.
Optical cable ends need to be cleaned before using them with the unit.
The following items are required for cleaning:
• Filtered compressed air or dusting gas (for example, Tech Spray Envi-Ro-Tech Duster 1671
gas, available from http://www.techspray.com/1671.htm)
• Lint-free pipe cleaners (for example, from 3M1) or lint-free swab
• Lint-free towels (for example, 10 x 10 cm or 4 x 4 in HydroSorb III wipers, available from
http://www.focenter.com/acctech/hydrosobr_wipers.htm)
• Optical grade isopropyl alcohol or optical grade 200° ethanol (do not use rubbing alcohol,
which contains 30% water)
To clean the connectors:
1. Blow the sleeve with filtered compressed air (Figure 3).
Figure 3: Connector Cleaning (connector type can vary)
13M is a trademark of 3M.

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2. Apply optical grade isopropyl alcohol or optical grade ethanol (do not use rubbing alcohol) to
a small area of a lint-free towel and rub the end of the ferrule over the wet area.
3. Wipe the ferrule on a dry area of the lint-free towel.
4. Using the dusting gas or compressed air, blow the end of the ferrule.
5. Apply the alcohol or ethanol to a lint-free pipe cleaner or swab and wipe off the remaining
parts of the connector.
6. With the other end of the pipe cleaner or swab, dry the areas cleaned.
7. Using the dusting gas or compressed air, blow the areas cleaned.
Mounting Considerations
The SK switch can be mounted in any orientation. The optical fibers require sufficient clearance
to maintain a minimum bending radius of 1.5 cm. This clearance must be maintained around the
fiber exit area.
Power Interface Connector
All electrical connections (parallel interface and power) to the SK switch are made through a
standard 26-wire ribbon cable with an attached 26-pin, 0.254 cm (0.1 inch) dual row connector
(Figure 4).
Figure 4: Dual Row Connector
The pin assignment is listed in Table 4.

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Table 4: Pin Assignment
Pin Signal Description
1 GND power ground
2 GND power ground
3 Busy busy output: low = idle, high = switching
4 D0 data line 0 input, least significant bit (LSB)
5 Error reset error output, low = normal, high = switch mechanism position check
failed (channel position is verified when the SK switch is reset)
6 D1 data line 1
7 not connected
8 D2 data line 2
9 not connected
10 D3 data line 3
11 not connected
12 D4 data line 4
13 /Strobe Strobe input, active low: high to low pulse = read data lines and reset line;
high pulse = ignore state of data lines and /Reset line. A minimum pulse
width of 1 µs is required. This line is pulled high internally via 10 K ohm
resistor to 5 V DC.
14 D5 data line 5
15 not connected
16 D6 data line 6, most significant bit (MSB)
17 not connected
18 /Reset Reset input: low sends the switch to the reset position, high returns to
channel as specified on data lines
19 GND power ground
20 GND power ground
21 not connected
22 not connected, reserved for D7
23 P5V 5 V power in
24 P5V 5 V power in
25 not connected, reserved for 12 V supply input
26 not connected

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All transistor-to-transistor logic (TTL) inputs and outputs are pulled high to 5 V DC through 10 K
ohm resistors. For inputs, the maximum low level output is 0.8 V, and the minimum high level is
2.0 V. For outputs, the maximum low level output is 0.5 V, and the minimum high level is 4.0 V.
Fiber Exit
The fibers always exit from the back of the unit (Figure 5), but the order can vary with the unit.
Figure 5: Fiber Exit

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Operating and Maintenance Instructions
External Description
The top and side views of the SK switch module are shown in Figure 6.
Figure 6: Top and Side Views of the SK Switch
Connections
The way that the SK switch interfaces with the input/output lines of a typical host controller is
shown in Figure 7.

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Figure 7: Typical Controller Connections
Pin Functional Description
Data Lines (D0 to D6)
Valid channel numbers are strobed in through the data lines on high-to-low transitions of the
/Strobe line. When a new channel is strobed in, the SK switch immediately selects the channel.
The channel number is represented as a binary number present on the data lines having the
values listed in the channel address in Table 5.