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This chapter covers the tasks of replacing a single card, a power supply, or a complete node.
The requirements for moving a node depend on the distance involved. In all cases however, the node must be disconnected from the network by:
The remainder of the task is the physical move of the unit. Use the pallet and box that came with the original packing to move the node a long distance. For shorter moves of a stand-alone unit, screw the feet up into the unit to expose the wheels then roll the unit.
 | Caution When moving a STRATM cabinet, do not push the cabinet at its sides. Instead, grip the cabinet at the front or back edges to maneuver it to the new location. |
This section describes how to perform a hot replacement of a front card. Read the following list before proceeding with front card replacement:
To replace a card with the power on:
Step 1 If necessary, delete relevant connection with the delcon command.
Step 2 Loosen the two phillips captive screws in the faceplate.
Step 3 Operate the extractor handles to disconnect the card from the backplane.
Step 4 Pull the card out of the card cage.
 | Warning It is vitally important that connector pins correctly align with receptacles. Before inserting a card, make sure the pins are straight. Make sure the connectors on the card and the backplane align with each other. Insert the card gently. |
Step 5 Installing a front card requires the card to be inserted into the card track and pushed firmly but gently into the connector. Hold the extractor handles in the open position until they contact the shelf supports then rotate them until closed.
Step 6 Tighten the two captive screws on the faceplate of the card.
This section describes how to remove and replace a back card.
| Warning It is vitally important that connector pins correctly align with receptacles. Before inserting a card, make sure the pins are straight. Make sure the connectors on the card and the backplane align with each other. Insert the card gently. |
Step 1 Except for an SCM or a case where the type of back card is being replaced (such as an AIT-T3 added and an FRI removed), a failed back card can be removed without deleting connections. Before replacing an SCM or changing card types, delete either all connections (SCM) or only card-specific connections (as in the FRI example) with the delcon command.
Step 2 Identify and mark any cable locations before removing cables from a back card.
| Caution Attach a ground strap between your wrist and the chassis. |
Step 3 Loosen the captive screws on the top and bottom of the faceplate of the card.
Step 4 Operate the extractor levers then slide the card out of the cabinet.
Step 5 Before installing a replacement back card, make sure that the pins are straight.
| Warning High voltages and currents are present within the IGX. Be extremely careful when working within reach of equipment to which electric power is applied. |
Step 6 Insert the card into the card track in the card cage and gently seat the card in the connector. If significant resistance occurs, the connectors may not be aligning with each other due to a bend in the card. In this case, removing other cards to provide room for manually aligning the card may be necessary. In this case, all precautions should be taken when placing a hand inside a hot card cage.
Step 7 Tighten the captive mounting screws on the top and bottom of the faceplate of the back card. Connect all cables to their proper location and secure them with the mounting screws on the connector.
A DC Power Entry Modules (PEM) contains few active components, so it rarely needs replacement. To replace a PEM, refer to Figure 5-1 and proceed as follows:
Step 1 Remove the cable guard: loosen the captive screw at its base and, holding the cable guard at its top and bottom, swing the guard away from the system at the base.
Step 2 Switch the circuit breaker on the PEM to the OFF position.
Step 3 Grasp the pluggable terminal block and disconnect it from the module.
Step 4 Remove the wiring from the strain relief mechanism.
Step 5 Loosen the captive screws that secure the PEM in the PE-BC.
Step 6 Pull the power entry module out of the Power Entry Back Card (PE-BC).
Step 7 Slide in the replacement module until it seats in the D-connector on the PE-BC.
Step 8 Tighten the screws to secure the PEM in the PE-BC.
Step 9 Place the wiring within the strain relief mechanism.
Step 10 Plug in the terminal wiring block into the DC receptacle.
Step 11 Switch the circuit breaker on the PEM to the ON position.
Step 12 Re-attach the cable guard after confirming correct system operation.
When a power supply has failed, a red FAIL light on the SCM turns on. Before replacing a power supply, check to see if it needs only to be reseated. The following steps describe how to reseat a supply then how to replace it.
Step 1 To remove the Air Inlet Grille, locate the small access hole at its the top and center.
Step 2 Insert a flat-bladed screwdriver in the access hole.
Step 3 Rotate the screwdriver to release the spring latch holding the Air Intake Grille (see "Release" in Figure 5-2).
Step 4 Tilt the air inlet grille down to approximately a 45º angle, then lift if out and set it aside. This exposes the power supply retainer bracket (a hinged door).
Step 5 With a flat-bladed screwdriver, unscrew the retainer screw in the center of the hinged door and tilt the door down.
Step 6 Identify which power supply needs replacement. The power supply lettering begins with A on the far left and continues through F on the far right.
Step 7 Loosen the captive screw at the front/bottom of the power supply. See Figure 5-3.
Step 8 Move the supply slightly out then reseat it and tighten the captive screw. This resets the supply's internal power-monitoring circuit.
Step 9 Check the supply-monitoring circuit on the SCM. First, enter the command resetcd 0 at the control terminal (this resets the power supply monitor on the SCM). After waiting about 10 seconds or more, enter dsppwr and see if the FAIL indicator for the supply comes on again. Note which power supply has failed.
Step 10 Loosen the captive screw that secures a supply to the power supply tray.
Step 11 Pull out the power supply with one hand on the handle and one hand under the supply.
To install a power supply, do the following:
Step 1 Slide a replacement power supply into the power supply tray and push it to the back. When a supply reaches the end of the slot in the tray, a slight resistance is encountered. Push the power supply slightly farther in to seat the supply correctly.
Step 2 Tighten the captive screw until it is finger-tight.
Step 3 Close the hinged door and tighten its retaining screw.
Step 4 Install the Air Intake Grille and press firmly on the top, then center of the Air Intake Grille until the latch snaps into place.
Step 5 Use the dsppwr command to check the status and output voltage of the power supply. Make sure the status is OK and the output voltage is 50 V ±2 V.
An IGX has either one or two cooling units. In an IGX 16, the single cooling unit resides immediately below the card cage. In an IGX 32, one unit resides below the lower card cage (Fan Tray 1). The booster unit (Fan Tray 2) resides above the upper card cage. If a fan failure occurs, the whole assembly must be replaced.
Fan trays are hot-swappable. However, the swap must go swiftly to keep the system cool. Replacement must take less than two minutes, and this is relatively easy. Otherwise, system power must be off. In an IGX 32, the fan tray that remains while the other tray is out helps keep the system cool. Have the replacement fan tray and tools nearby to help the swap go quickly. The required tools are a flat blade screwdriver and phillips screwdriver.
To replace the cooling unit assembly:
Step 1 Have the replacement fan tray and tools ready and located near the front of the node.
Step 2 For the bottom fan tray, remove the air intake grille at the front of the system by turning the internal screw at the top-center of the grille a quarter turn, tilting the grille forward, and lifting it out. (Fan Tray 2 at the upper end of an IGX 32 does not have an air intake grille.)
Step 3 Examine the front and back of the fan tray to be familiar with the setup. Note the power connectors attached to the fan tray: the connectors at the fan tray itself are to be disconnected rather than the D-connector at the PE-BC. Also note that the captive screws that hold the fan tray in place are at the front of the bottom fan tray (Fan Tray 1) and at the back of the booster fan tray (Fan Tray 2) in an IGX 32.
Step 4 Loosen the captive screws.
Step 5 At the back of the IGX, remove the clamp that secures the power cable for the fans to the chassis.
Step 6 Use a small screw driver or fingertip in this step. For each of the fan power connectors, press in the small plastic latch that locks the connector halves together. With the other hand, grip the part of the connector that is attached to the fan tray and separate the cord from the fan tray. The fan tray now has no power.
Step 7 Push a finger or thumb through the square holes in the chassis to ease the fan tray towards the front of the system. Go to the front of the system.
Step 8 Remove the cooling unit and slide in the replacement unit.
Step 9 Plug the power connectors into the fan tray. Make sure plug P1 connects to connector P1, and plug P2 connects to connector P2.
Step 10 Do a visual check to make sure all fans are operating.
Step 11 Use the dsppwr command to see if system software recognizes correct operation.
Step 12 Secure the fan tray assembly by tightening the captive screws.
Step 13 Attach the clamp for the fan power cord to the chassis.
Step 14 After lower fan tray replacement, return the air intake grille.
Backplane fuses rarely, if ever, need replacement. The 5A, fast blow backplane fuses are intended to prevent catastrophic damage to the backplane in the event of accidental shorting of -48 VDC on the backplane to chassis ground. This type of event could be caused by bent backplane pins, contact of conductive elements (EMI Cans, EMI Gaskets, etc.) to power pins. These events would most likely happen during a factory build or initial system installation.
Because of design constraints, these fuses need to be in sockets on the backplane and are therefore not readily accessible. A special tool (StrataCom P/N 218090-00) and a set of instructions are required for fuse replacement. StrataCom recommends that only factory-trained personnel do the procedure.
In the IGX, backplane fuses normally exist on only the back of the backplane. In the early models of the IGX 16/32, fuses exist on the front of the backplane. Figure 5-5 shows the fuse locations on the back of the backplane. These are F1 through F16 and two spare fuses. Note that Figure 5-5 shows only the upper portion of the backplane, and the connection on the far right is the system power connection. Figure 5-6 illustrates the earlier model of the backplane and the fuses on the front of the backplane.
| Warning Replacing a fuse with the power off requires StrataCom-trained personnel using a special tool. |
Posted: Mon Sep 16 17:30:12 PDT 2002
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