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This chapter describes the Network Adaptation module (NAM).
This section provides a description of the NAM, which is illustrated in Figure 5-1.
The NAM extracts the output signal from the dense wavelength division multiplexing (DWDM) laser on the Client Layer Interface Port (CLIP) module and transfers it to the A side, the B side, or both sides. In optically protected systems, the NAM splits the output signal from the DWDM laser on the CLIP module and transfers it to the A and the B sides. The NAM can split the signal symmetrically (50/50) or asymmetrically (10/90 or 90/10). In optically unprotected systems, the NAM transfers the optical signal to the A or B side (100/0 or 0/100). The output splitting ratio is controlled by a fixed optical coupler and cannot be changed without replacing the NAM.
The NAM also transfers the incoming optical signal from another node to the receiver(s) of the CLIP module.
The LEDs on the front panel of the NAM display the status of the CLIP module that is mounted directly above it.
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Note The NAM is active, but does not include alarm or supervisory subunit functions. |
The NAM front-panel LEDs are used to monitor CLIP operating parameters. Monitored items include the alarms, power, and status. Figure 5-2 shows the front panel LEDs which are described in Table 5-1.
A CLIP module is mounted directly above the NAM. Two (unprotected) or three (protected) fibers come from the NAM to the CLIP module front panel. The receiver fibers are labeled A and B.
Four DWDM-side fibers come from a protected NAM (two DWDM-side fibers from an unprotected NAM). These fibers are separated into two groups, labeled A and B. Each group includes one optical fiber connector (type MU) from the transmitter and one from a receiver, mounted in a duplex MU connector.
The duplex MU connector contains two fibers labeled A or B. The transmitting fibers include a label to indicate the coupling ratio (10, 50, or 90). This label helps you connect the fibers correctly to each Hub Filter module (HFM).
An unprotected NAM does not include an optical coupler. It has only two patch cords, one for the receiver and one for the transmitter. For unprotected CLIP modules, use the receiver labeled A for the received optical signal. Figure 5-3 is a block diagram of the NAM used in protected configurations. Figure 5-4 is a block diagram of the NAM used in unprotected configurations.
Located on lower right-hand corner of the NAM module are 4-bit configuration header (jumpers) that the CLIP uses to identify the splitting ratio of the NAM. These jumpers display the split ratio in the web interface and the CLI. The jumpers are numbered 1 through 4. Table 5-2 lists the jumper setting for each splitting ratio.
This section covers environmental and mechanical specifications for the NAM. Although the NAM is an active device, optical and electrical specifications do not apply.
Table 5-3 lists environmental specifications for the NAM during operating conditions.
Table 5-3 NAM 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) |
All NAMs consist of the following parts:
Protected NAMs consist of the following additional parts:
Unprotected NAMs consist of the following additional parts:
Two MU connectors (going to the CLIP)
Table 5-4 lists NAM mechanical specifications.
Table 5-4 NAM Mechanical Specifications
| Item | Specification |
|---|---|
0.20 kg (0.4 lbs.) protected version |
This section explains how to remove and replace a NAM. Make sure you have the replacement module and any supplies, such as tagging materials, present on site before beginning the removal and replacement procedures.
The ONS 15252 Release 1.0.1 (Product No. 800-12162-03) or higher includes an updated NAM. The Release 1.01 NAM is designated with a "NEBS-3" print on the faceplate, whereas the previous version of the NAM does not have this faceplate print. The Release 1.01 or higher shelf requires the Release 1.01 NAM. You can also use Release 1.01 NAMs in the Release 1.0 shelf (Product No. 800-12162-02). For more information about the shelf versions, refer to the Cisco ONS 15200 Product Description.
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Caution Placing NAMs without the NEBS-3 print into a Release 1.01 shelf may result in equipment damage. Such a configuration is not recommended nor supported by Cisco; it may void warranty. |
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Warning The ONS 15200 is energized with -48 VDC power. |
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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. |
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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. |
If the NAM (channel) is protected, repeat Step 1 on the other side of the passive optical shelf.
Step 2 Remove the MU duplex connector from one HFM at a time.
Step 3 Put caps on the ends of the disconnected optical fiber jumper cables.
Step 4 Put dust plugs in the MU adapters in the HFM.
If the NAM is protected, repeat Steps 2, 3, and 4 on the other side of the passive optical shelf.
Step 5 One at a time, disconnect the three (or two unprotected) MU connectors at the CLIP module:
Step 6 Using a slot or Phillips screwdriver, loosen the NAM retaining screw.
Step 7 Carefully remove the NAM from the slot.
Step 8 If you are not going to replace a NAM, carefully insert a Dummy NAM into the slot.
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Caution Before replacing a NAM, verify that the NAM is the appropriate release for the shelf assembly or equipment damage could result. For an ONS 15200 Release 1.01 shelf assembly (800-12162-03) the NAM front panel should display NEBS-3. For an ONS 15200 Release 1 shelf assembly (800-12162-02) the NAM will not be printed. |
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Note If you are replacing a NAM, remove the currently installed NAM. If you are replacing a Dummy NAM, remove the Dummy NAM from the relevant NAM position. |
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Note Before replacing the NAM, verify that the NAM jumpers are set to match the label on the NAM module. See Table 5-2 for the NAM jumper settings. |
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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. |
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Note Make sure that the NAM is properly inserted in the ONS 15252 MCU guide rails (in particular, the lower guiding rail). |
Step 2 Carefully seat the NAM into the slot, making sure the backplane connector and the NAM connector are correctly mated and that no fibers are damaged.
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Caution Be sure not to harm the optical fibers and connectors emerging from the NAM. |
Step 3 Using a slot or Phillips screwdriver, tighten the NAM retaining screw.
Step 4 Connect the three (or two unprotected) MU connectors from the NAM to the three (or two unprotected) MU adapters in the corresponding CLIP module. Begin with the inner connectors, labeled A and B, and connect the outer transmitter connector last. Figure 5-6 shows a connected NAM and CLIP module.
Step 5 Remove the dust cap from the relevant MU connector.
Step 6 Clean and inspect the relevant MU connector.
Step 7 Remove the dust plugs from the relevant MU adapter.
Step 8 One at a time, remove dust plugs from the HFM and remove fiber caps from NAM duplex MU connectors.
Step 9 Clean and inspect the optical fiber connectors.
Step 10 Connect one (unprotected) or two (protected) duplex MU connectors from the NAM to the HFM (unprotected) or HFMs (protected). Use the labeling on the fiber to ensure that the A-side and the B-side of the node are not interchanged. Figure 5-7 shows a NAM connected to an HFM.
Step 11 After connecting the NAM to the HFM, press the button at the HFM bottom and push the HFM slightly upward (about 10 mm [0.5 in.]) to expose two grooves on the HFM top.
Step 12 Verify that the fiber is firmly fixed in the two lateral grooves on top of the HFM.
Step 13 Snap the HFM back into place by pushing the button and gently pressing downwards, carefully not to damage any fiber.
Step 14 In the case of a protected channel, repeat Steps 11, 12, and 13 for the other HFM.
Step 15 Store excessive fiber in the space between the NAM and the ONS 15252 MCU passive optical shelf.
Step 16 Close the lid over the passive optical shelf.
Posted: Thu Apr 17 15:10:59 PDT 2003
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