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This chapter describes the Termination module (TM).
The TM terminates the optical signal in the ONS 15252 Multichannel Unit (MCU) after the signal has passed through the Hub Filter module (HFM) add/drop filters.
The TM terminates fiber connectors from the last HFM. Figure 10-1 shows the side-view of a TM.
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Note The TM is passive and does not include alarm or supervisory subunit functions. |
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Note TM connectors include an MU-to-MU duplex adapter. |
This section provides environmental and mechanical specifications for the TM. The TM is a passive device; therefore, optical and electrical specifications, as well as default thresholds, do not apply.
Table 10-1 lists environmental specifications for the TM during operating conditions.
Table 10-1 TM Environmental Specifications
| Item | Specification |
|---|---|
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Short term operating temperature |
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Normal operating relative humidity Short term operating relative humidity (per GR-63, NEBS level 3) |
The TM consists of the following parts:
Table 10-2 lists TM mechanical specifications.
This section explains how to remove and replace the TM module. Install the TM in the passive optical shelf of the ONS 15252 MCU. Make sure the replacement and any supplies, such as tagging materials, are present on site before beginning the removal and replacement procedures. Figure 10-2 illustrates TM placement in the shelf.
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Warning The ONS 15252 Multichannel Unit (MCU) is energized with -48 VDC power. |
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Caution Static electricity can damage electro-optical modules. When 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. |
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Warning Follow proper safety procedures when removing modules without switching off the relevant subrack. |
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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 TM optical connections.
Step 3 Put dust plugs in the MU optical adapters on the TM.
Step 4 Install protective caps on the optical fiber jumper cables disconnected from the TM.
Step 5 Push the button located at the bottom front of the TM.
Step 6 Raise the TM enough to pull it forward and out of the passive optical shelf.
Step 7 Carefully remove the TM from the passive optical shelf.
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Note Be careful with the two fibers from the last Hub Filter module. Those fibers must be terminated, either by installing a new TM or inserting a BM, a CMX, or a CMY module. |
Step 8 Close the passive optical shelf cover.
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Note Replace a TM only when a new TM is required, or when you need a TM to replace an earlier BM, CMX or CMY module. |
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Warning Follow proper safety procedures when removing modules without switching off the relevant subrack. |
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Warning Do not look directly at the optical connector output beams during connector removal. The beams can cause permanent eye damage. |
Step 2 If needed, make room at the end of the Hub Filter module (HFM) row by removing a Dummy Filter module (DFM).
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Note To lock the TM effectively, you must slide the TM on the bottom of the passive optical shelf. Failure to do so may cause the TM to pop up. If popped up, the TM will not align properly with the rest of the modules. |
Step 3 Carefully position the TM into the passive optical shelf.
Step 4 Push the TM retainer located at the bottom front of the TM.
Step 5 Snap the TM into place by pressing gently downwards.
Step 6 Remove the dust caps from MU adapters located on the TM front panel.
Step 7 Remove the dust plugs from the MU duplex connector located on the fiber optical jumper cable coming from the adjacent HFM.
Step 8 Clean and inspect the MU duplex connector.
Step 9 Connect the MU duplex connector to the TM using the MU adapter.
Step 10 Close the passive optical shelf cover.
Posted: Thu Apr 17 15:11:22 PDT 2003
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