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This chapter describes the Connection Module X (CMX).
The CMX connects the filters in two ONS 15252 Multichannel Units (MCU). The CMX is, in principle, a Bridge module (BM) with longer fibers. The CMX passes traffic on wavelengths not dropped in the first ONS 15252 MCU to the second ONS 15252 MCU and vice versa. The CMX connects A-side filter banks in one chassis to B-side filter banks in another chassis. This crossover is needed for systems using more than 16 Client Layer Interface Port (CLIP) boards in the MCU. If you do not use a CMX, you can use two Termination modules (TMs) to terminate the MU connectors on the last HFMs.
Figure 12-1 illustrates a CMX.
Figure 12-2 illustrates a block diagram of the CMX. Note that the fibers in the CMX are crossed and not coupled straight.
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Note The CMX is passive and does not include alarm or supervisory subunit functions. |
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Note CMX module connectors include an input optical fiber duplex adapter (type MU connector) and an output MU duplex adapter. |
This section provides environmental and mechanical specifications for the CMX module. The CMX module is a passive device; therefore, optical and electrical specifications, as well as default thresholds do not apply.
Table 12-1 lists environmental specifications for the CMX module during operating conditions.
Table 12-1 CMX 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 CMX module consists of the following parts:
The CMX module uses two 5.0 m (16.40 feet) SMF patch cords. Table 12-2 lists CMX module mechanical specifications.
This section explains how to remove and replace the CMX. Install the CMX module in the passive optical shelf of the ONS 15252 MCU when you are planning to setup the ONS 15200 system in the mesh configuration. Make sure the replacement modules and any supplies, such as tagging materials, are present on site before beginning the removal and replacement procedures.
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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. |
The CMX half replaces a TM in the ATO system (used to hold the duplex MU-MU connector).
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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 duplex MU connector attached to the first CMX half.
Step 3 Put dust caps on the duplex MU connector.
Step 4 Put dust plugs in the adapters on the CMX.
Step 5 Raise the CMX half to expose the lateral grooves, and remove the fiber. Also, remove the fiber from the lateral grooves of the DFM between the LM and the first HFM.
Step 6 Push the button at the bottom of the CMX front panel to release it from the passive optical shelf. Move the CMX upward and slide it out of the passive optical shelf.
Step 7 Insert a Dummy Filter module (DFM) into the available space to fill the passive optical shelf.
Step 8 Repeat Steps 2 - 7 for the other side of the CMX located in the additional MCU.
Step 9 Close the doors of the passive optical shelves.
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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 Remove the TM from the passive optical shelf to make lateral space:
a. Disconnect the connector from the adapter.
b. Put dust caps on the MU-MU duplex connector.
c. Put dust plugs in MU-MU duplex adapter.
d. Press the button on bottom of the TM and press upwards and towards you to remove the TM.
Step 3 Place a CMX half in the passive optical shelf at the end of the row of HFM modules where the TM was removed. Make sure the slot on the back of the module interlocks with the crossbeam located in the passive optical shelf.
Step 4 Push the front panel button to snap the CMX into place.
Step 5 Remove the dust plugs from the MU-MU duplex adapter in the CMX.
Step 6 Remove the dust caps located on the optical fiber MU-MU duplex connector.
Step 7 Clean, inspect, and insert the MU duplex connector from the adjacent HFM in the CMX half.
Step 8 Guide the optical fiber cable from the CMX through the lateral grooves on the sides (top front) of the CMX and out through similar grooves on a DFM adjacent to the LM.
Step 9 Guide the fiber from the CMX through the lateral opening in the hinged cover.
Step 10 Repeat Steps 2 - 9 for the other side of the CMX.
Step 11 Close the cover, making sure no fiber is pinched in the process.
Posted: Thu Apr 17 15:01:10 PDT 2003
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