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Installing the Cisco ONS 15216 FBG DCU

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Installing the Cisco ONS 15216 FBG DCU

This document explains how to install the Cisco ONS 15216 fiber Bragg grating dispersion compensation unit (FBG DCU).


Note

In this document, the terms "Cisco ONS 15216 FBG DCU" and "FBG DCU" have been used interchangeably.

Overview of the Cisco ONS 15216 FBG DCU

A DCU is placed in an optical network when the accumulated chromatic dispersion exceeds the maximum allowed dispersion tolerance. The DCU compensates for chromatic dispersion generated in the optical fiber, thus avoiding the need of dropping and regenerating the degraded optical signal. There are different types of DCUs and the fiber Bragg grating dispersion compensation unit is one of them. In an FBG DCU, the dispersion compensation is achieved by using a short segment of optical fiber having periodic variation in its refractive index.

Product Description

The Cisco ONS 15216 FBG DCU is a low latency dispersion compensation unit (DCU) that uses the Fiber Bragg Grating (FBG) technology. It has a very low insertion loss when compared to a standard DCU. The Cisco ONS 15216 FBG DCU complements the Cisco ONS 15216 platform and can interoperate with the ONS 15454, ONS 155xx, and ONS 15600 products.

There are multiple FBG DCU modules, each designed to operate at a specific compensation level. Individual modules can be cascaded to provide higher level of compensation. The Cisco ONS 15216 FBG DCU modules operate in the C-band within the wavelength range of 1528.77 nm to 1566.31 nm at a 100 GHz grid spacing.


Note

The Cisco ONS 15216 FBG DCU should be used only in networks carrying traffic at 100 GHz grid spacing.

The FBG DCU consists of the following components:

  • FBG DCU module—This unit performs the dispersion compensation process. It consists of optical fiber grating, optical connectors, and optical mating adapters for optical input and output connections. The optical mating adapter has a shutter that provides protection from laser radiation. The shutter also protects against dirt and dust, which can cause equipment failure. The FBG DCU module has a USB port, which is used only when the FBG DCU is placed in an ONS 15454 M6 shelf. The USB connection between the FBG DCU module and the ONS 15454 M6 shelf is used for retrieving inventory data. The FBG DCU module is a passive unit and therefore, does not need any electrical power supply. The various parts of the FBG DCU module are shown in the following figure.
    Figure 1. Parts of the FBG DCU Module



    1 Cable holder clip 2 Pull handle
    3 USB cable holder 4 USB port
    5 Locking latch 6 Optical mating adapter
    For various Cisco ONS 15216 FBG DCU product IDs (PIDs) and the corresponding dispersion compensation values, see Optical Specifications.
  • DCU chassis (Product ID: 15216-DCU-SA=)—This is a passive mechanical chassis that is used to house the FBG DCU modules. Inside the chassis, two independent FBG DCU modules are placed, as shown in the following figure. The DCU chassis can be mounted on a 19-inch (482.6-mm) or 23-inch (584.2-mm) rack using suitable brackets. It occupies one rack-unit (RU) space.
    Figure 2. DCU Chassis



    1 First FBG DCU module 2 Second FBG DCU module

Features

The Cisco ONS 15216 FBG DCU has the following features:

  • Latency lower than 25 ns.
  • Low insertion loss values (4.5 dB maximum).
  • Optical connectivity, using the LC-UPC connector.
  • USB connectivity with Cisco ONS 15454 M6 shelf for retrieving inventory data.
  • Installation supported in standard Cisco ONS 15216 DCU SA chassis.

Safety Information

Before you install, operate, or service this product, you must read the Regulatory Compliance and Safety Information for Cisco Optical Transport Products document for important safety information and warning translations.

This product is compliant with the GR 1089, UL60950 /CSA 22.2 No. 60950-00, and IEC 60950 standards.

Laser Radiation Emission Restrictions

The Class 1M Laser safety and warning label is affixed to this product and indicates that the product should never be used or installed in an optical network with emissions higher than Class 1M.


Warning
Class 1M laser radiation when open. Do not view directly with optical instruments. Statement 281

Warning
Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or view directly with optical instruments. Statement 1051

Electrical Safety

This product is optically and electrically passive and requires no electrical connections. No electrostatic discharge (ESD) or other electrical safety considerations apply.

Installing the FBG DCU in the Chassis

Install the FBG DCU by sequentially following these procedures.

Unpacking and Verifying the Unit

Procedure
    Step 1   After receiving the FBG DCU package, unpack and verify that it includes the following:
    • FBG DCU module
    • Job aid card
    • Warranty sheet
    • Packing slip
    Step 2   Compare the equipment received with the equipment list that the customer service representative provided. If there are any discrepancies, notify the Customer Service Center.
    Step 3   Visually check all components for external damage. Look out for the following damages:
    • Bent or broken cable holder clip
    • Dent on the outer case
    • Damaged USB connector
    • Broken shutters for optical mating adapters
    • Jammed or broken locking latch
    • Scratched paint
    • Missed labels
    Step 4   Immediately report any shipping damage to the customer service representative. Keep the following information handy while contacting the customer service.
    • Invoice number of shipper (see packing slip)
    • Model and serial number of the damaged unit (printed on the front panel)
    • Description of damage
    • Effect of damage on the installation
    • Packing slip

    Installing the DCU Chassis on the Rack


    Note

    The DCU chassis should be procured separately; product ID: 15216-DCU-SA=.

    Procedure
      Step 1   Screw the mounting brackets onto the DCU chassis, as shown in the following figure.
      Figure 3. Installing Mounting Brackets on the DCU chassis



      1 Bracket screws 2 Mounting bracket
      Step 2   Position the DCU chassis on the rack such that the rear face of the mounting bracket is flush against the front face of rack.
      Step 3   Align the mounting bracket screw holes with that of the rack.
      Step 4   Insert the rack mounting screws into the screw holes and tighten them, as shown in the following figure.
      Figure 4. Mounting the DCU Chassis on the Rack



      1 DCU chassis 2 Mounting screws
      3 Washer 4 Mounting bracket
      5 Rack    

      Grounding the DCU Chassis


      Warning

      This equipment must be grounded. Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available. Statement 1024

      Procedure
        Step 1   Crimp a #14 AWG ground cable to the ground lug.
        Step 2   Connect one end of the ground cable to the DCU chassis. The screw holes to fix the grounding lug is present on the right side of the DCU chassis, as shown in the following figure.
        Figure 5. Installing the Grounding Lug



        1 Grounding lug 2 Lug screws
        Step 3   Terminate the other end of the ground strap either at the office ground point or the rack ground point.

        Installing the FBG DCU Module in the DCU Chassis

        Procedure
          Step 1   Align the FBG DCU module with the opening on the front-face of the DCU chassis.
          Step 2   Use both hands to push the module all the way into the chassis until the locking latch, present on the right side of the module, clicks into place (see the following figure).
          Figure 6. Installing the FBG DCU Module



          Step 3   Repeat the above steps to insert the second FBG DCU module in the DCU chassis.

          Installing and Routing Fiber-Optic Cables


          Warning

          Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or view directly with optical instruments. Statement 1051

          Before You Begin

          Visually inspect the fiber-optic cable to check its physical integrity.

          Always clean all fiber connectors thoroughly before making the connection with the optical mating adapter. Very small dust particles can permanently damage the end of the mating fiber inside the FBG DCU module. For cleaning instructions see Cleaning and Maintaining Fiber-Optic Connectors.

          Procedure
            Step 1   Lift the shutter of the optical mating adapter present on the front panel of the FBG DCU module.
            Step 2   Place the LC/UPC cable connector in front of the optical mating adapter and align the cable connector with the adapter slot.
            Step 3   Gently push the cable connector into the adapter until you hear a click, which indicates that the latching system is engaged.
            Step 4   Route the optical fiber cables through the cable holder clip.
            Step 5   If required, bundle and secure the fibers using velcro strips.

            Installing and Routing the USB Cable

            Perform this procedure only if the FBG DCU is placed in a Cisco ONS 15454 M6 shelf.

            Procedure
              Step 1   Correctly align the USB connector with the USB port present on the front panel of the FBG DCU module.
              Step 2   Push the USB connector into the USB port.
              Step 3   Unscrew and remove the USB cable holder provided on the pull handle, as shown in the following figure.
              Figure 7. Installing USB Cable Holder



              1 Screws 2 USB cable holder
              3 Pull handle    
              Step 4   Route the USB cable through the groove present on the cable holder.
              Step 5   Screw the USB cable holder in place to secure the USB cable.
              Step 6   Connect the other end of the USB cable to the Cisco ONS 15454 M6 shelf.
              What to Do Next

              Retrieval of inventory data from the FBG DCU module is performed using the USB connection. For details about using USB connectivity, see the "Connecting Passive Modules to a ONS 15454 M2 or ONS 15454 M6 Node" section and the "NTP-G319 Connect a Passive Module to the Cisco ONS 15454 M2 or Cisco ONS 15454 M6 Node" task in the "Node Reference" chapter of the Cisco ONS 15454 DWDM Configuration Guide.

              Uninstalling the FBG DCU

              If the DCU unit is not functioning properly, it results in high insertion loss. When this insertion loss exceeds a threshold value, the DCU-LOSS-FAIL alarm is raised in CTC. For more information about the DCU-LOSS-FAIL alarm, see the Cisco ONS 15454 DWDM Troubleshooting Guide.

              For the purpose of maintenance or replacement, you need to uninstall the FBG DCU by sequentially following these procedures.

              Removing the FBG DCU Module from the DCU Chassis

              Procedure
                Step 1   Disconnect the optical and USB cables from the FBG DCU module.
                Step 2   Push the locking latch to the left and hold it. The locking latch is located on the right-side of the FBG DCU module, as shown in the following figure.

                If the locking latch is jammed, apply more pressure to release it.

                Step 3   Use the pull handle to pull the module until the locking latch comes out free, as shown in the following figure. The pull handle is provided on the center of the front panel.
                Figure 8. Removing the FBG DCU Module from the DCU Chassis



                1 Push the locking latch 2 Pull the handle
                Step 4   Release the locking latch.
                Step 5   Use both hands to remove the FBG DCU module from the DCU chassis.

                Removing the DCU Chassis Grounding


                Note

                This procedure must be performed only after removing the FBG DCU module from the DCU chassis by performing the steps listed in Removing the FBG DCU Module from the DCU Chassis.

                Procedure
                  Step 1   Unscrew the lug screws from the grounding lug.
                  Step 2   Disconnect the chassis ground strap from the FBG DCU chassis.
                  Step 3   Disconnect the chassis ground strap from the office ground point or the rack ground point.

                  Removing the DCU Chassis from the Rack

                  Procedure
                    Step 1   Unscrew the rack mounting screws from the mounting brackets.
                    Step 2   With both hands lift the DCU chassis out of the rack.
                    Step 3   If required, unscrew the mounting brackets from the DCU chassis.

                    Cleaning and Maintaining Fiber-Optic Connectors

                    Connector cleaning is required to maintain the performance of fiber-optic circuits. It is important that both the LC/UPC connector at the end of the fiber-optic cable and the optical mating adapter on the front panel of the device are clean before the connection is made.


                    Warning

                    Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or view directly with optical instruments. Statement 1051

                    The following warning applies to disposal of chemicals and other materials used to clean connectors and adapters:


                    Warning

                    Ultimate disposal of this product should be handled according to all national laws and regulations. Statement 1040


                    Note

                    Before installing the fiber-optic cable, always perform the cleaning procedure for cable connectors described in the following section. Whenever possible, inspect each connector before connecting it to the optical mating adapter on the front panel.


                    Note

                    The LC optical mating adapter on the faceplate of the device is less likely to get dirty if it is capped when not in use. On some devices, the optical mating adapter has a shutter. The shutter automatically closes when the LC/UPC connector is disconnected. This prevents entry of dirt.

                    The procedure for a thorough cleaning of these adapters is complicated. Use a commercially available cleaning kit and closely follow the instructions included with the kit.

                    Customer-supplied Cleaning Materials

                    The Type A fiber optic connector cleaners (for example, CLETOP reel) are recommended to clean the cable connectors, but are not supplied with the device.

                    If properly maintained (only used with clean, defect-free fiber connectors and capped when not in use), the mating adapter would not require cleaning. However, if you suspect the adapter is dirty, clean it by using the CLETOP stick swab.


                    Note

                    For multifiber cable assemblies, use specific cleaning tools or materials designed for the assembly type.

                    Cleaning the Optical Mating Adapter

                    Procedure
                      Step 1   Read the cartridge cleaning instructions (provided by the manufacturer) to insert the cartridge cleaning tip into the optical mating adapter.
                      Step 2   Slide the lever on the cartridge to swipe the mating surface.
                      Note   

                      Always keep unused adapter ports and fiber connectors capped with a clean dust cap. The optical mating adapters that have shutter need not be capped.

                      Cleaning Fiber-Optic Cable Connectors

                      The tools required to clean fiber connectors are:
                      • Inspection microscope
                      • Type A Fiber Optic Connector Cleaner (CLETOP reel)
                      • Optical swab
                      • Optical receiver cleaning stick
                      Procedure
                        Step 1   Using an inspection microscope, inspect each fiber connector for dirt, cracks, or scratches.
                        Step 2   Replace any damaged fiber connectors.
                        Note    Replace all dust caps whenever the equipment is unused for 30 minutes or more.
                        Caution   

                        Do not reuse optical swabs. Keep unused swabs off of work surfaces.

                        Step 3   Clean the fiber connectors with CLETOP reel:
                        1. If present, remove the dust cap from the fiber connector.
                        2. Press the lever down to open the shutter door. Each time you press the lever, you expose a clean wiping surface.
                        3. Insert the connector into the CLETOP cleaning cassette slot, rotate one-quarter turn, and gently swipe downwards.
                        4. Use an inspection microscope to inspect each fiber connector for dirt, cracks, or scratches. If the connector is not clean, repeat the above sub-steps.
                        5. Insert the fiber connector into the applicable adapter or attach a dust cap to the fiber connector.
                        Note    Before replacing a dust cap on a connector, verify that the dust cap is clean. To clean the dust cap, wipe the outside of the cap using a dry, lint-free wipe and the inside of the dust cap using a CLETOP stick swab (14100400).

                        FBG DCU Technical Specifications

                        These are the technical specifications for the Cisco ONS 15216 FBG DCU.

                        Optical Specifications

                        The Cisco ONS 15216 FBG DCU modules operate in the C-band within the wavelength range of 1528.77 nm to 1566.31 nm at a 100 GHz grid spacing. Each module is designed to operate at a specific compensation level as listed in the following table.

                        Table 1 Cisco ONS 15216 FBG DCU Optical Specifications
                        Module PID Compensation Level (nominal dispersion at 1545.31 nm)
                        FBGDCU-165 15216-FBGDCU-165= -165 ps/nm
                        FBGDCU-331 15216-FBGDCU-331= -331 ps/nm
                        FBGDCU-496 15216-FBGDCU-496= -496 ps/nm
                        FBGDCU-661 15216-FBGDCU-661= -661 ps/nm
                        FBGDCU-826 15216-FBGDCU-826= -826 ps/nm
                        FBGDCU-992 15216-FBGDCU-992= -992 ps/nm
                        FBGDCU-1157 15216-FBGDCU-1157= -1157 ps/nm
                        FBGDCU-1322 15216-FBGDCU-1322= -1322 ps/nm
                        FBGDCU-1653 15216-FBGDCU-1653= -1653 ps/nm
                        FBGDCU-1983 15216-FBGDCU-1983= -1983 ps/nm

                        Connector Specifications

                        There are no optical connectors on the DCU chassis. The connectors are present only on the FBG DCU modules as listed in the following table.

                        Table 2 Cisco ONS 15216 FBG DCU Optical Connector Specifications
                        Function Connector Type Receptor Type
                        Optical-input LC-UPC connector LC-UPC or LC-PC connector
                        Optical-output LC-UPC connector LC-UPC or LC-PC connector
                        Inventory retrieval USB USB

                        Mechanical Specifications

                        All the individual Cisco ONS 15216 FBG DCU modules are of identical dimensions, which is listed in the following table.

                        Table 3 Cisco ONS 15216 FBG DCU Mechanical Specifications
                        Parameter Specification
                        Dimensions (height x width x depth)

                        41.1 mm x 208.2 mm x 204.9 mm

                        1.62 in. x8.20 in. x 8.07 in.
                        Weight

                        Minimum: 0.5 kg (1.1 lb)

                        Maximum: 0.8 kg (1.8 lb)

                        Environmental Specifications

                        Operate the Cisco ONS 15216 FBG DCU within the environmental specifications listed in the following table.

                        Table 4 Cisco ONS 15216 FBG DCU Environmental Specifications
                        Parameter Specifications
                        Minimum Maximum
                        Operating temperature -5° C 50° C
                        23° F 122° F
                        Storage temperature -40° C 70° C
                        -40° F 158° F
                        Relative humidity 5% 85%

                        Additional References

                        Use this document in conjunction with the other release-specific documentation:

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