Table of Contents

11.2.1 Environmental Specifications
11.2.2 Mechanical Specifications

Remove the Bridge Module and Replace it With Two TMs
Replace the Bridge Module in the Passive Optical Shelf

Bridge Module

This chapter describes the Bridge module (BM).

11.1 Functional Description

The BM enables traffic from the A-side or B-side to pass through the ONS 15200 Multichannel Unit (MCU). The BM allows the portion of the optical signal not intended for the node to bypass the nodes. The BM allows traffic from the A-side to pass through the MCU and exit on the B-side and vice versa (i.e., traffic from the B-side passes through the MCU and exits on the A-side).

Figure 11-1 illustrates the BM.

Figure 11-2 illustrates a block diagram of the BM. Note that the fibers in the BM are crossed and not coupled straight.

If the BM is not used, Termination modules (TMs) are used instead to prevent reflections. A Connection Module X can also replace the BM.

Note   The BM is passive and does not include alarm or supervisory subunit functions.

Note   BM connectors include two dual MU-MU adapters (female), two MU-MU patch cords and two plastic housings to hold the MU-MU adapters.

11.2 Technical Specifications

This section provides environmental and mechanical specifications for the BM. The BM is a passive device; therefore, optical and electrical specifications, as well as default thresholds, do not apply.

11.2.1 Environmental Specifications

Table 11-1 describes BM climatic limits during normal operation.

11.2.2 Mechanical Specifications

Table 11-2 lists BM mechanical specifications.

The BM consists of the following parts:

The BM uses two 2-m (47-inch) SMF patch cords.

11.3 Removing and Replacing a BM

This section explains how to remove and replace the BM. Install the BM in the passive optical shelf of the ONS MCU 15252 unit when you plan to configure the ONS 15200 system in the mesh configuration. Make sure the replacement unit and any supplies, such as tagging materials, are present on site before beginning the removal and replacement procedures. Figure 11-3 shows BM placement in the shelf.

Warning The Multiple Channel Unit (MCU) is energized with -48 VDC power.

Caution   Static electricity can damage electro-optical modules. While handling electro-optical modules, wear a grounding wrist strap to discharge the static buildup. Wrist straps are designed to prevent static electricity damage to equipment.

Remove the Bridge Module and Replace it With Two TMs

Warning Follow proper safety procedures when removing modules without switching off the relevant subrack.

Warning Do not look directly at the optical connector output beams during connector removal. The beams can cause permanent eye damage.

Step 2   Disconnect the dual MU connectors from the A-side and the B-side of the BM.

Step 3   Push the retainer button located on the bottom front of the BM.

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Note    Put dust plugs in the MU optical adapters on the BM.

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Caution   Install protective caps on the optical fiber jumper cables disconnected from the BM.

Step 4   Raise the BM enough to pull it forward and out of the passive optical shelf one half at a time.

Step 5   Carefully remove the BM from the passive optical shelf. (See Figure 11-3 for the BM position.)

Step 6   Position two Terminal modules (TM) into the passive optical shelf, one adjacent to the A-side on the far right, and the other adjacent to the B-side on the far left.

Step 7   Press each TM retainer located at the bottom front of the TM.

Step 8   Snap each TM into place.

Step 9   Remove the dust plugs from MU adapters located on the front panel of the TM.

Step 10   Remove the dust caps from the MU duplex connectors. These are located on the fiber optical jumper cables coming from the adjacent Hub Filter modules (HFMs).

Step 11   Clean and inspect the MU duplex connectors.

Step 12   Connect an MU duplex connector to each MU adapter to terminate the fibers normally.

Step 13   Close the passive optical shelf cover.

Replace the Bridge Module in the Passive Optical Shelf

Warning Do not look directly at the optical connector output beams during connector removal. The beams can cause permanent eye damage.

Step 2   Disconnect the inputs on the two TMs associated with the BM slot.

Step 3   Put dust plugs in the MU optical adapters on the TMs.

Step 4   Install protective caps on the optical fiber jumper cables disconnected from the TMs.

Step 5   Push the individual retainer buttons located at bottom front of the TMs.

Step 6   Raise the TMs enough to pull them forward and out of the passive optical shelf.

Step 7   Carefully remove the TMs from the passive optical shelf.

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Note    There are two ports on the BM, both with dual input/output MU connectors.

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Step 8   Position the BM into the passive optical shelf (Figure 11-3). Push the button on the bottom, press gently downwards, and snap into place.

Step 9   Remove the adapter dust plugs and optical fiber end caps on fibers that are to be connected to the BM.

Step 10   Clean the dual MU connectors on the optical fiber jumpers.

Step 11   Connect the dual MU connector on the A-side.

Step 12   Connect the dual MU connector on the B-side.

Step 13   Raise both halves of the BM, to expose the lateral grooves. Insert the fiber in them, while maintaining a good bending radius (not less than 35 mm). Carefully snap back into place

Step 14   Close the passive optical shelf cover.

Posted: Thu Apr 17 14:58:21 PDT 2003
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