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96-Channel Fixed Mux/Demux (FMD96)

 

The 96-Channel Fixed Mux/Demux (FMD96) is a passive, rack-mounted module that is installed alongside a ROADM node to provide local fixed grid access to all 96 wavelengths in the DWDM 50-GHz channel plan. It has a single bidirectional line port, a monitor port, and 96 bidirectional client ports with each client port carrying a different fixed wavelength. See DWDM 50-GHz Wavelength Plan for the wavelength to client port mapping. See Figure 1 .

Figure 1: Front Panel
Front Panel

The module is standalone and does not communicate with the attached ROADM node, but it can be represented as part of a ROADM element when managed with a supported network management system.

The L1 port carries the composite DWDM signal and connects to the ROADM module. The client ports C1 through C96 provide add/drop access to the individual wavelengths and typically connect to transponder modules in colocated equipment. The MON port allows you to monitor the composite signal at the output of the multiplexer and at the input to the demultiplexer.

The block diagram of the FMD96 is shown in Figure 2.

Figure 2: Block Diagram
Block Diagram

This topic includes the following information:

C-Band

In the line-in direction, the incoming C-band channels from the L1 port are demultiplexed into individual wavelengths for output onto the respective client ports.

In the client-in direction, the individual C-band channels are multiplexed onto a composite signal for output on the L1 port.

OSC

The FMD96 does not process the OSC signal from the attached ROADM module. Instead, the FMD96 demultiplexes the OSC signal from the composite signal on the L1-In port and multiplexes it back into the composite signal for output on the L1-Out port. This allows the connected ROADM module to detect the presence of the FMD96 if applicable.

Monitoring Points

The FMD96 provides diagnostic equipment (connected to the MON port), monitoring access to internal blocks.

In the line-in direction, the monitoring point is at the input to the demultiplexing stage after the OSC signal has been extracted. In the line-out direction, the monitoring point is at the output of the multiplexing stage before the OSC signal is multiplexed back in.

96-Channel Fixed Mux/Demux Specifications

See Table 1 for the FMD96 specifications.

Table 1: FMD96 (BT8A78MD03) Specifications

Parameters

Range

Physical

Width

438 mm

Height

88 mm

Depth

280 mm

Weight

 

Environmental

Temperature and Humidity

See Site Requirements.

Power Consumption

Not applicable, passive

Optical

Minimum

Typical

Maximum

Central Wavelengths (C-band)

1528.77 nm

 

1566.72 nm

Number of Channels (50-GHz spacing)

  

96 channels

Insertion Loss (client in to line out)

4.0 dB

 

6.5 dB

Insertion Loss (line in to client out)

4.0 dB

 

6.5 dB

Monitor In Port Loss1

19.6 dB

 

22.3 dB

Monitor Out Port Loss2

17.9 dB

 

21.2 dB

L1 Composite Input Signal Power

  

23 dBm

Client Input Signal Power

  

5 dBm/port3

Wavelength (OSC, Line Port)4

1266 nm

1310nm

1360 nm

Fiber Type

SMF-28 or equivalent

Connector

LC/UPC

1 Relative to L1 In.

2 Relative to L1 Out.

3 The input power per client port must not exceed this limit to ensure that the optical safety on line output is within Class 1M requirements.

4 For connection to ROADM client ports.

Installing a 96-Channel Fixed Mux/Demux (BT8A78MD03)

Use this procedure to install a 96-Channel Fixed Mux/Demux (FMD96).

The FMD96 is a standalone, passive module that is designed to be installed directly into the following types of racks:

  • 23-inch ANSI equipment rack

  • 19-inch ANSI equipment rack

  • 19-inch (410 mm) ETSI equipment rack

  • 21-inch (500 mm) ETSI equipment rack

Note

The FMD96 is not NEBS-3 certified.

The FMD96 is shipped as a complete unit with hinged cover and latch, fiber support, and 21/23-inch mounting bracket attached. An installation kit with a 19-inch mounting bracket and installation hardware is included with the FMD96.

Tools Required

  • Installation kit (included)

  • Grounding cable

  • Grounding cable connector to ground source

  • Number 2 Phillips screwdriver (for ground screw)

  • Number 2 Robertson screwdriver or hex wrench (for fasteners that attach the module to the frame)

Note

Be familiar with the site, safety, and installation guidelines described in Module Installation and Removal Guidelines.

Two L-shaped mounting brackets are installed on each side of the FMD96. The mounting brackets attached to the FMD96 are dual-function with the 21 and 23-inch configuration governed by orientation. Three mounting positions are available. Choose the mounting position that ensures the FMD96 is flush with adjacent equipment. The FMD96 is shipped with the mounting brackets installed in the 23-inch orientation and mounted in the mid position.

  1. Choose one of the following options based on the frame requirements and the mounting position.
    1. To install the 23-inch brackets (see Figure 3):

      Figure 3: 23-inch Bracket Mounting Positions
      23-inch Bracket Mounting Positions
        1
      Mounting position
        3
      Mounting position
        2
      Mounting position
       

      Choose the mounting positions that enable the module to be installed flush with adjacent equipment.

      If required, remove the mounting brackets and attach the brackets to the new mounting positions.

    2. To install the 21-inch brackets (Figure 4):

      Figure 4: 21-inch Bracket Mounting Positions
      21-inch Bracket Mounting Positions
        1
      Mounting position
        3
      Mounting position
        2
      Mounting position
       

      Remove the screws from the 23-inch mounting brackets if installed. Choose the mounting position that enables the module to be installed flush with adjacent equipment.

      Reuse the mounting bracket screws to fasten the 21-inch mounting bracket to the module.

    3. To install the 19-inch brackets (Figure 5):

      Remove the 23-inch mounting brackets if installed. Choose the mounting position that enables the module to be installed flush with adjacent equipment.

      Reuse the mounting bracket screws to fasten the 19-inch mounting bracket to the module.

      Figure 5: 19-inch Bracket Mounting Positions
      19-inch Bracket Mounting Positions
        1
      Mounting position
        3
      Mounting position
        2
      Mounting position
       
  2. Mount the module on the frame or the rack.
    1. With one person at each side of the module, lift the module into position in the equipment frame.

    2. Align the mounting holes in the mounting bracket with the mounting holes in the equipment frame.

    3. Choose the set of mounting screws from the installation kit to mount the shelf into the equipment frame. Use one mounting screw and washer for each mounting bracket attachment. No locking nuts are required as the mounting screws fasten into the threaded screw inserts on the frame.

  3. Ground the module.
    1. Attach the ground cable (not supplied) to the grounding lug supplied in the installation kit.

      Figure 6: Attach the Ground Cable
      Attach the Ground Cable

    2. Loosen the grounding screw and attach the lug over the ground screw.

    3. Secure the lug by fastening the ground screw.

    4. Attach the other end of the ground cable to ground.

      The other end is connected to the frame using a biting star lock washer between the lug and the frame, and between the lug and the screw head.

  4. Open the cover and connect fibers. The fibers should be routed between the front panel and the front cover to allow for the cover to be opened and closed. Caution

    When the ports are optically connected, the module is capable of passing light from all client and line ports at all times. The client and line port connections must be limited to Class 1M (21.3 dBm) Laser Safety Regulations.

  5. Close the cover after connecting the fibers.

You have successfully completed this procedure.

Removing an FMD96

Use this procedure to remove the FMD96 from a rack.

Tools Required

  • Number 2 Phillips screwdriver (for ground screw)

  • Number 2 Robertson screwdriver or hex wrench (for fasteners that attach the module to the frame)

  • Antistatic bag

Note

Be familiar with the site, safety, and installation guidelines described in Module Installation and Removal Guidelines.

  1. Open the hinged front cover and disconnect the fibers.Caution

    When working with the FMD96, follow the safety procedures associated with equipment containing Laser Safety Hazard Level 1M.

    Caution

    When the ports are optically connected, the module is capable of passing light from all client and line ports at all times. The client and line port connections must be limited to Class 1M (21.3 dBm) Laser Safety Regulations.

  2. Disconnect the ground cable. See Figure 7

    Loosen the ground screw and remove the lug and ground cable. Secure the ground screw again.

    Figure 7: Remove the Lug
    Remove the Lug

  3. Remove the FMD96 from the frame or the rack.
    1. Position one person on each side of the FMD96 to secure the FMD96 during removal.

    2. Remove the mounting screws and washer for each mounting bracket attachment.

    3. Remove the FMD96 from the frame or the rack.

    4. Place the FMD96 in antistatic packaging and stow in accordance with the environmental storage conditions.

You have successfully completed this procedure.