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This chapter describes how to install the hardware components that make up the MGX 8850 switch.
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Note Most of the information in this chapter applies to an open rack installation. Information about the Cisco rack appears in "Site Preparation." |
Although the viewpoint of this chapter is that a plan exists for the network and the location of each card is predefined, it reviews some of the planning decisions for the switch. For a list of physical and electrical characteristics of the switch, see "System Specifications."
The MGX 8850 node ships in one of two configurations:
Note the following information before installing any components:
The installation tools are as follows:
Before proceeding with the installation described in this chapter, you must be sure to do the following:
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Note If you are upgrading from a Release 1 chassis with the power on, and you are using fan trays with the part numbers 800-03208-01, 800-03208-02, 800-03208-03, or 00-03208-04, you must remove the PXM boards before proceeding with Step 1 in the following instructions. If you have a fan tray with any other part numbers or you upgrade the chassis with the power off, you do not need to remove the PXM boards before proceeding with the following instructions. |
This procedure is applicable only if you have ordered the fan tray spacer.
Step 2 Connect the new fan cable to the second fan tray.
Step 3 It is recommended that the customer turn off power for the upgrade. If you insist on leaving the chassis powered on, the upgrade process must be as follows:
1. Remove PXM1 front cards.
2. Remove PXM1 back cards.
3. Remove remaining Release 1 front and back cards.
4. Remove center guide module. (See"Removing the Center Guide Modules" in this chapter for instructions.)
5. Remove the bottom fan spacer.
6. Install the bottom fan tray.
7. Connect the bottom fan tray cable to the backplane. (See "Installing Fan Tray Power Cabling" for instructions)
8. Install PXM45.
9. Install PXM-UI-S3.
10. Install PXM-HD.
11. Install remaining Release 2 front and back cards.
The minimum distance between left and right mounting rails (as you face the rack) must be 17.75 inches or 45.08 cm. (Note that some 19 inch racks only have 17.50 inches between rails.) The width of the enclosure modules, such as card cage, fan tray, and so on, is 17.72 inches. Each module has flanges that serve as the front mounting brackets in a 19-inch rack. For a 23-inch rack, Cisco Systems provides special adapter brackets. The 19-inch rack version appears in Figure 4-1.
You can attach the enclosure modules to the mounting rails at the following points on the modules:
The mounting rail locations comply with racks that require mounting on front, middle, and rear mounting rails, as shown in Figure 4-2. A front view of the mounting rails is shown in Figure 4-3.
This section describes how to install the mandatory and optional modules that make up the MGX 8850 switch. For open rack installations, Cisco advises you to remove the cards and optional AC power supplies before installing the switch. Therefore, this section begins with the steps for removing and installing these items.
When you install the modules, keep in mind the following:
1. Due to the presence of a disk drive on the PXM45 back card, you should leave these cards in place. If you remove a PXM45 back card, handle it with care to prevent disk damage.
2. For an AC-powered installation, you must remove the AC power supplies before installing the power supply tray.
3. Because of the weight and bulk of the card cage, it is mandatory that two or more people be available to install it. One person with a mechanical lift can install the node.
4. As you place each module in the rack, be sure that it does not drag across the surface of the module beneath it. Therefore, as you move it into position towards the back of the rack, lower the module to rest only after it is all the way in the rack and directly above the module beneath it.
5. A vertical gap (.047"-.077" [about 1/16"] or 0.119 cm-0.196 cm) must be left between all modules to allow for later module removal.
6. Two installers can hold a module to provide the vertical gap while driving in the first two screws. If one person is installing the modules, use a spacer to hold the gap until you have installed the screws. For modules that require four or eight screws, two people are required only until the bottom two screws are in place.
7. If an enclosure module takes more than two screws, install the two bottom screws first.
8. Thread-forming (self-tapping) screws to attach mid-mount mounting brackets are furnished with the system. You can use the thread-forming screws to pre-thread mounting holes to make screw insertion easier.
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Caution Do not use a power screwdriver on captive screws. |
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Caution Do not rest the chassis on its horizontal card guide flanges. |
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Caution Make sure that mounting the equipment does not create a hazardous condition due to uneven mechanical loading. The equipment rack should be securely supported. |
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Caution The location of the rack must allow air to flow unrestricted in and out of the node. |
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Warning Verify the chassis is not receiving power while you are installing the components. |
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Warning Before handling any cards, ground yourself to the card cage with a wrist strap. |
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Warning When moving a Cisco-supplied cabinet, do not push the cabinet at its sides. Instead, grip its front or back edges. |
The information in this section applies to only an open rack installation. It identifies the installation sequence for the node in general. For the sequence of enclosure modules in particular, see "Stacking Order for System Modules" later in this chapter.
The installation sequence is as follows:
1. Remove all cards (except the PXM45s) and the power supplies according to the instructions in "Removing a Front Card," "Removing a Back Card," and "Removing an AC Power Supply" later in this chapter.
2. Install enclosure modules in the order listed in "Stacking Order for System Modules" and according to the instructions in "Installing the System" later in this chapter.
System modules must be configured in the following sequence, beginning at the bottom (see Figure 4-4):
1. Optional AC power tray assembly
2. Air intake plenum
3. Lower fan tray
4. Card cage (with optional door)
5. Upper fan tray
6. Exhaust plenum
Full size front cards have a latch at both the top and the bottom of the front panel, and half size front cards have a latch on the top of the front panel to secure them into the card cage (see Figure 4-5).
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Warning To prevent damage to the cards from static electricity, put on a wrist strap and connect it to any convenient metal contact on the system or card cage before you touch any cards. |
Perform the following steps to remove a front card:
Step 2 To separate the card from the backplane connector, pull out the levers at both the top and bottom of a full size card simultaneously or at the top of a half size card.
Step 3 Gently pull the card out of the card cage and store it in a safe location.
Perform the following steps to remove a back card:
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Note Older cards have only flat-blade screws; new cards have combination Phillips/flat-blade screws. |
Step 2 Simultaneously pull out both extractor levers to pull the card from the backplane connector.
Step 3 Gently pull the card out of the card cage and store it in a safe location.
To remove an APS-connected back card, see "Removing the APS Backplane from the Card Cage" in this chapter.
Removing AC power supplies makes the AC power tray installation much easier. For a mid-mount installation, however, you must remove the power supplies for reasons explained in "Installing the System" later in this chapter. Before executing the following steps, make sure you record the location of each power supply.
Step 2 Tilt the air inlet grille down to about a 45-degree angle, then lift it out and set it aside. This action exposes the hinged door that serves as the power supply retainer bracket.
Step 3 With a flat-blade screwdriver, unscrew the captive retainer screw in the center of the hinged door and tilt the door down.
Step 4 Loosen the captive screw at the front-bottom of the power supply you want to remove. (See Figure 4-7.)
Step 5 Grip the handle, then pull straight out to remove the supply.
Using the guidelines in "Before You Begin" and "Considerations for Mounting the MGX 8850 Modules" sections earlier, install each module according to the steps in this section. This section contains descriptions for the system modules and includes descriptions for the power cables and cable manager.
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Note If this node requires the brackets for a 23-inch rack, attach them to the applicable modules. |
Perform the following steps to install the AC Power Tray:
Step 3 While you secure the front of the power supply tray with the front screw, hold the adjacent front flange of the tray slightly to the outside so the hinged door can freely open and close. (See "Front Flange" in Figure 4-9.) The space between the right-angle edge of the flange and the edge of the hinged door should be approximately .030 inches (about the thickness of a thumbnail).
For a DC-powered system, install the DC-PEMs at the back of the air intake module. If you install only one DC-PEM, install it on the right as viewed from the rear of the module. (See Figure 4-10 and Figure 4-11.)
For important information on removing a PEM in a redundant setup with the power on, see "Swapping a Primary or Redundant DC PEM With Power On" later in this chapter.
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Note A vertical gap (.047"-.077" [about 1/16"] or 0.119 cm-0.196 cm) must be left between all modules to allow for later module removal. |
AC power supply requirements depends on the following:
Follow the guidelines in the table below for the AC power supply requirements for the MGX 8850:
| Cards Installed | Power Supplies Needed |
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1-5 Cards | 2 AC power supplies (minimum) for a dual and single AC line cord system. |
5-9 Cards | 4 AC power supplies (minimum) for a dual AC line cord system (2 on each line cord). 3 AC power supplies (minimum) for a single AC line cord system. |
10+ Cards | 6 AC power supplies are required for a dual AC line cord system 4 AC power supplies for a single line cord system. |
If you left the AC power supplies in the tray during installation, proceed to the next section. Perform the following steps to re-install power supplies you have removed:
Step 2 Secure each supply to the tray by tightening the captive screw at the bottom-front of each supply. For slots without a power supply, the hinged door on the tray should already have a removable blank panel.
Step 3 Rotate the hinged door and tighten the captive retainer screw in the center of the hinged door with a flat-blade screwdriver.
Step 4 Replace the air intake grille by putting the lower hooks over the hinged panel and then rotating the grille until it snaps in place.
Install the air intake plenum (3 RUs) above the AC power assembly. (See Figure 4-12.)
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Note A vertical gap (.047"-.077" [about 1/16"] or 0.119 cm-0.196 cm) must be left between all modules to allow for later module removal. |
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Note If you are upgrading from a Release 1 chassis, and/or you are using fan trays with the part numbers 800-03208-01, 800-03208-02, 800-03208-03, or 00-03208-04, you must remove the PXM boards before installing fan trays with power on. If you have a fan tray with any other part number, you do not need to remove the PXM boards before proceeding. |
Install the lower fan tray (1 RU) above the air intake plenum. See Figure 4-13, and note the label at the rear of the module stating "This Side Up."
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Note A vertical gap (.047"-.077" [about 1/16"] or 0.119 cm-0.196 cm) must be left between all modules to allow for later module removal. |
Install the card cage (10 RUs) above the lower fan tray. When you move the card cage into position, be sure the base of the card cage at the back fully clears the top-rear edge of the spacer unit or fan tray beneath it.
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Tips While one person slides the card cage into place from the front, another person should be at the rear to help guide the card cage through the rails and into place. If the screw holes on the card cage are not aligned with the holes on the frame, place a flat-blade screwdriver between the card cage and fan tray to raise the card cage. Then insert the screws, remove the screwdriver from between the fan tray and card cage, and tighten the screws. |
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Note A vertical gap (.047"-.077" [about 1/16"] or 0.119 cm-0.196 cm) must be left between all modules to allow for later module removal. |
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Note If you are upgrading from a Release 1 chassis, and/or you are using fan trays with the part numbers 800-03208-01, 800-03208-02, 800-03208-03, or 00-03208-04, you must remove the PXM boards before installing fan trays with power on. If you have a fan tray with any other part number, you do not need to remove the PXM boards before proceeding. |
Install the upper fan tray (1 RU) above the card cage. See Figure 4-13, and note the label at the rear of the module stating "This Side Up." When you move the fan tray into position, make sure its base at the back aligns with the top-rear edge of the card cage beneath it.
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Note A vertical gap (.047"-.077" [about 1/16"] or 0.119 cm-0.196 cm) must be left between all modules to allow for later module removal. |
Install the exhaust plenum (2 RUs) above the upper fan tray.
If you need to install the cable manager, proceed to the next section, "Installing the Cable Management Hardware," before you do the tasks in the section titled "Installing Fan Tray Power Cabling."
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Note A vertical gap (.047"-.077" [about 1/16"] or 0.119 cm-0.196 cm) must be left between all modules to allow for later module removal. |
Step 2 Next, install the cable manager panels to the mounting brackets with the provided #10-32 screws. As Figure 4-14 shows, the orientation of the cable managers must be such that the cable channels on the top cable manager are on top, and the cable channels on the bottom cable manager are on the bottom.
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Note Fiber optic cabling and copper cabling take the same paths on the cable manager. |
The fan trays receive power from the backplane through a fan power cable. To reach the backplane connector, the fan power cable D-connector passes through an opening at the lower rear of the card cage. At the fan-tray end of the cable, the D-connector plugs into J1 at the back of the fan power tray. See Figure 4-15 for an illustration of the fan power cable and Figure 4-16 for an illustration of the card cage area with the cabling openings for AC-powered systems. Note that the openings for system power cabling alternate with the smaller openings for fan power. From left to right, the sequence of access openings is as follows:
1. System power (source A).
2. Fan power (lower fan tray).
3. System power (source B).
4. Fan power (upper fan tray).
To install the fan power cabling:
Note the orientation (smaller side of the D-connector down) of the D mating connector on the backplane.
Be sure the D-connector is fully inserted in the backplane connector, and the captive screws on the connector frame are clearly aligned with the threaded holes on the chassis.
Step 2 Tighten the captive screws only enough to secure the connector frame flush to the chassis. Do not use a power screwdriver.
Step 3 Plug the D-connector into P1 on the applicable fan tray and tighten the captive screws only enough to secure the connector. Do not use a power tool.
Step 4 Repeat Step 3 with the other cable to the other fan tray.
A power interconnect cable carries -48 VDC current from an AC power tray to the backplane (see Figure 4-17 and Figure 4-18). The end with the metal frame around the D-connector plugs into the larger of the access openings to the backplane. From left to right, the first and third access openings are for system power.
Perform the following steps to install system power cabling:
Step 2 Move the connector straight towards the backplane so you can guide it through the second internal guide.
Be sure you have fully seated the D-connector in the backplane connector, and the captive screws on the connector frame are clearly aligned with the threaded holes on the chassis.
Step 3 Tighten the captive screws only enough to secure the connector frame flush with the chassis. Do not use a power screwdriver.
Step 4 Plug the D-connector without the frame into J1 on the applicable power supply tray connector.
Step 5 Tighten captive screws only enough to secure the connector. Do not use a power tool.
Step 6 Repeat Steps 4 and 5 with the other cable to the other power supply tray connector.
If you removed the AC power supplies before installing the AC power tray, re-install them in the same locations they had when the system arrived. If necessary, use the steps in the section titled "Installing AC Power Supplies." The AC power receptacle on the system is an IEC-type with a clamp.
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Note The AC voltage range is 180-264 VAC. |
Cisco can provide AC power cords with the following types of AC wall plugs:
Perform the following steps to install the power cord:
Step 2 Firmly seat the cable plug into the AC receptacle plug.
Step 3 Tighten the clamp.
Step 4 Insert the other end of the power cable into the wall outlet.
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Caution Verify the branch circuit power is off before you insert the power cable into the wall outlet. |
A power interconnect cable carries -48 VDC current from a DC-PEM to the backplane (see Figure 4-19). The end with the metal frame around the D-connector plugs into the larger of the access openings to the backplane. From left to right, the first and third access openings are for system power.
Perform the following steps to install system power cabling:
Step 2 Move the connector straight towards the backplane so you can guide it through the second internal guide.
Be sure you have fully seated the D-connector in the backplane connector, and the captive screws on the connector frame are clearly aligned with the threaded holes on the chassis.
Step 3 Tighten the captive screws only enough to secure the connector frame flush with the chassis. Do not use a power tool.
Step 4 Press down on the top of the plastic cover of the connector plug to rotate and expose the pins.
Step 5 Plug the D-connector without the frame into J1 on the applicable power entry module.
Step 6 Tighten captive screws only enough to secure the connector. Do not use a power tool.
If you need to swap a DC PEM in a redundant system with the power on, see "Swapping a Primary or Redundant DC PEM With Power On" below for instructions.
If necessary, you can replace either a primary or a redundant PEM with power on. To avoid possibly tripping the system circuit breaker in the process, use the sequence described in this section for disconnecting and reconnecting the system power cabling.
Perform the following steps to remove a PEM with system power on:
Step 2 Turn off the branch circuit at the DC source (the distribution box, for example) for the correct branch.
Step 3 Remove plastic terminal block cover (see Figure 4-21).
Step 4 Disconnect both sets of DC source wires (both input cables) at the wiring terminal blocks on the PEM.
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Note The following Caution and Steps 5 through 7 only apply to earlier builds without the plastic protector cover on the cable connector plugged into the PEM. If you are using a cable connector with the plastic protector cover, proceed to Step 8. |
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Warning The cable connector must be disconnected at the backplane end during hot PEM insertion or removal. If you disconnect the cable first at the PEM, the system power cable is still hot. These hot contacts may inadvertently touch a surface of the chassis or metal connected to the chassis. If this contact occurs, the -48 VDC is shorted to the chassis, and the circuit breaker on the still-active PEM open shutting down the system. |
Step 5 Locate the backplane end of the system power cable for the PEM you intend to replace.
Step 6 At the backplane end of the system power cable, loosen the captive screws on the cable bracket.
Step 7 Pull the cable bracket out approximately one inch to disconnect the cable.
Step 8 At the end of the system power cable connected to the applicable PEM, loosen the jack screws and disconnect the cable from the PEM.
Step 9 Remove the PEM.
Perform the following steps to install a PEM in a system with power on:
Step 2 Insert the PEM and tighten the captive mounting screws.
Step 3 Connect the system power cable at the PEM.
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Note Step 4 and Step 5 applies only if you disconnected the backplane connector in Step 4 of the previous procedure; otherwise, proceed to Step 6. |
Step 4 Connect the backplane end of the system power cable to the backplane. This requires some dexterity, especially if the cabling around the system power cable is dense. Grasp the cable bracket at the captive screws and gently push the bracket straight in. Furthermore:
Step 5 Tighten the connector screws.
Step 6 Attach the three DC source wires at the wiring block on the PEM.
Step 7 Re-attach plastic cover over the terminal block (see Figure 4-21).
Step 8 Turn on the DC power at the circuit branch source.
Step 9 Turn on the circuit breaker of the PEM.
This section describes how to connect the DC wiring to the system. This system uses 6 AWG
(10 square mm) or larger copper wire. For details on wire lengths, wire gauges, and grounding concerns, see "Site Preparation."
Each primary or redundant DC source connects to one DC PEM in the system. Make sure that each source comes from a dedicated branch circuit. Only a source that complies with safety extra low voltage (SELV) requirements in IEC60950/EN60950 should be connected to a DC-powered system. The wiring for a DC-powered system is provided by the customer and must be three-wire solid or stranded copper with insulation rated for 60 degrees centigrade.
A plastic cover visible at the bottom of Figure 4-21 is used to cover terminal block connections. Two Phillips screws secure this cover to the PEM.
Use the visual information in Figure 4-21 and Figure 4-22 to connect the DC wiring.
Perform the following steps to connect DC power to the switch:
Step 2 Strip the insulation back 0.25 inches (6 mm) and install the terminal lug on each wire.
Step 3 With power off at both the switch and the source, attach each terminal wire to the #10 lugs to the applicable terminals on the PEM terminal block. (See Figure 4-22.)
Step 4 Turn the power switch on. Verify the LEDs on the front of the card are lit and the fans spin up.
To install full height cards where half height cards used to reside, you will need to remove the center guide modules, located at the front of the card cage. Each center guide module encompasses two board slots, so plan board replacements accordingly. Each empty slot in the new configuration will require installation of a blank card module for air flow control and EMI containment. When removing center guide modules, you must remove them sequentially, starting from the left and working towards the right.
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Note Even though most portions of the vertical guide supports are insulated, Cisco Systems recommends that you turn off power before proceeding. If center guide modules are removed while power is on, care must be exercised to prevent an adjacent card from being shorted out by contact with the non-insulated leg ends of a vertical support while it is being removed. |
To remove the center guide modules perform the following steps:
Step 2 Remove the face plate from the module by pulling it towards you.
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Note The vertical supports located immediately to the right of vertical bulkheads do not have attached "legs." If you are removing center guide modules from these particular slots, disregard Step 3 and proceed to Step 4. |
Step 3 Push the vertical support carefully straight downward approximately 1/2 inch, tilt the top leg of the support towards you until it clears the top of the card cage, and then pull up on the support to remove it from the card cage.
Step 4 Locate the jackscrew behind the hole in the faceplate of the center guide module. Use an appropriately sized flat bladed screwdriver to loosen the jackscrew at least five complete rotations counterclockwise to disengage the module from the card cage.
Step 5 Slide the center guide module carefully from the card cage.
Step 6 Repeat the above steps until you have completed removing the desired number of center guide modules.
This section describes how to install front and back cards. Service modules can go in any slot except reserved slots 7 and 8, which the PXM45s occupy, and slots 15 and 16, which are reserved for the SRMs.
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Warning To prevent damage to the cards from static electricity, put on a wrist strap and connect it to any convenient metal contact on the system or card cage before you touch any cards. |
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Warning Inserting the cards in the correct slot is important for all cards but especially for the back cards because of the potential for electrical damage. If you insert a service module back card into a PXM45 back card slot (upper or lower bay of slot 7 or 8), damage to the card and backplane may result. If you accidentally insert a back card for a service module into any slot, check for bent or damaged pins on the backplane and the back card or bent keying hardware. |
Verify the accuracy of the intended slot for each card before you begin installing the cards.
Perform the following steps to install a front card:
Step 2 Gently slide the card all the way into the slot.
Step 3 Press the insertion-extractor lever until it snaps into the vertical position.
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Note The card should slide in and out with only slight friction on the adjacent board's EMI gaskets. Do not use force, and investigate any binding. |
Verify the accuracy of the intended slot for each card before you begin installing the cards.
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Caution Before using the system, verify that the daughter card type on the PXM back card corresponds to the uplink card type by executing the dspcd command. If you receive a "mismatch" response, remove the daughter card and replace with the proper daughter card. |
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Warning Do not install an OC-48 back card with any other card than an OC-48 front card or you will damage the cards. |
Perform the following steps to install a back card:
Step 2 Gently slide the card all the way into the slot.
Step 3 Push the card into the connector until it is flush with the card cage.
Step 4 Tighten the two captive screws on the card faceplate until the faceplate is flush with the chassis.
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Tips If you are having difficulty inserting the screws, look from the side to verify alignment of the holes and screws. |
The optional APS (Automatic Protection Switching) back plane, when installed with optical AXSMs, features 1+1 and 1:1 port-to-port and card-to-card redundancy protection in the case of fiber cut or hardware failure.
The Automatic Protection Switching (APS) backplane has two design features (see Figure 4-23) which help ensure proper connection between the APS assembly and the cards you attach to it:
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Note The APS backplane must be attached to at least one of the primary and/or redundant back cards before installing the APS back card assembly into the midplane. |
Considerations to take before installing the APS-connected back cards:
Perform the following steps to install back cards into the APS backplane assembly:
Step 2 Push the card into the APS backplane firmly to seat.
Step 3 Repeat the first two steps if you are installing a second card into the backplane assembly (see Figure 4-24.)
Perform the following steps to install the APS assembly into the card cage:
Make sure the extractor levers are in the "in" position (see Figure 4-23.) As you move the cards, the levers should be flush with the vertical edge of the back cards (see Figure 4-24) or the assembly will not slide into the card cage properly.
Step 2 Slide the cards all the way into the slot and push them evenly to ensure the assembly seats properly and engages the midplane connectors.
When fully inserted, the faceplates should be almost flush with the chassis.
Step 3 Tighten the captive screws on the cards with the appropriate screw driver.
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Tips If you have difficulty inserting the screws, look from the side to verify alignment of the holes and screws. |
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Note Individual APS-connected back cards can be removed (and reinstalled) using normal board removal and installation procedures. Be sure to remove one card at a time. Do not pull both cards from the APS backplane simultaneously. |
If you need to remove a card from the APS backplane, follow these steps:
Step 2 Pull both extractor levers out toward you to remove the back card with the APS backplane from the midplane.
To remove the APS assembly from the backplane, follow these steps:
Step 2 Pull both extractor levers out toward you to remove the back card with the APS backplane from the midplane.
Step 3 Slide the APS assembly with back cards attached out of the card cage.
This section describes the unique requirements for installing the Processor Switching Module (PXM45) card set and the features of each associated back card. The PXM45 card set consists of the PXM45 front card, the PXM User Interface back card (PXM-UI-S3) and the PXM Hard Drive back card (PXM-HD). Each description includes a faceplate description and a list of applicable cables. For instructions on how to configure the PXM45 functionality for switch and network control, refer to Cisco MGX 8850 Switch Software Configuration Guide. For lists of the physical details of PXM45 cards, standards compliances, and so on, see "System Specifications."
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Note The common instructions for installing any card in this system appear in an earlier section, "Installing Cards." |
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Caution Handle the PXM45 front card very carefully; do not drop or bump the card. |
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Warning If you accidentally insert a back card for a service module into any slot, check for bent or damaged pins on the backplane and the back card or bent keying hardware. |
Primarily, the PXM45 controls the switch and provides 45 Gbps of non-blocking, shared memory switching. In addition, the PXM45 features are as follows:
For descriptions of system configuration tasks and how to modify partitioning, specify APS, and add UNI-port connections, refer to Cisco MGX 8850 Switch Software Configuration Guide. An illustration of the PSM45 front card appears in Figure 4-25.
The PXM45 User Interface card (PXM-UI-S3) connects the switch to the various ports that allow you to communicate with and control the switch. Install the PXM-UI-S3 in the upper half of the back of the PXM45. See Figure 4-26 for the connectors on the PXM-UI-S3. For specifications on this card, see "System Specifications."
The back card also provides:
If external equipment or a local digital central office is to provide synchronization to the MGX 8850 node, you can connect the external clock source to the PXM-UI-S3 back card. The PXM-UI-S3 has two external clock inputs (CLK1 and CLK2, shown in Figure 4-26) which can support either T1 or E1 external clock input, but not both. For redundancy, connect to both ports, using CLK1 as the primary source and CLK2 as the secondary source.
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Note For redundant PXM configurations where two PXM-UI-S3 are preset, the Y-cable should be used to connect to the CLK1 input of Slot 7 and CLK1 of Slot 8 in case of hardware failure. For BITS source protection, connect another Y-cable to the CLK2 input of Slot 7 and CLK2 input of Slot 8. See "Redundancy Y-Cable" in Appendix D for cable information. |
The cnfclksr command allows both ports to be configured as T1.
For more information about this feature refer to the Cisco MGX 8850 Switch Software Configuration Guide.
Dry contact relay closures are available for forwarding MGX 8850 alarms to an alarm system. Separate visual and audible alarm outputs are available for critical, major, and minor alarm outputs. The MGX 8850 alarm outputs are available on a DB15 connector on the PXM-UI-S3 back card faceplate. See "Cabling Summary," for the pinouts on this connector. Use a switchboard cable for running these connections.
The Processor Switching Module Hard Drive (PXM-HD) is a single-height back card that resides in slot 23. It houses a 6Gbyte hard disk drive containing all switch and network-related information and an OC-3 uplink controller port. An illustration of the PXM-HD appears in Figure 4-27.
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Caution Handle the PXM-HD card very carefully to preserve the alignment of the attached disk drive. Do not drop or bump the card. |
The following sections describe the ATM Switch Service modules (AXSM).
The MGX-AXSM-4-622 is a double-height dual-role card that serves as a trunk or a UNI, and provides 4 OC-12c or STM-4c, 4 lines at 622 Mbps. An illustration of this card appears in Figure 4-28. For specifications on this card, see "System Specifications."
An illustration of the long-reach OC-12 card appears in Figure 4-29. For specifications on this card, see "System Specifications."
The intermediate reach OC-12 back card appears in Figure 4-30. For specifications on this card, see "System Specifications."
The MGX-AXSM-16-155 is a double-height dual-role card that serves as a trunk or a UNI, and provides 16 OC-3c or STM-1c, 16 lines at 155 Mbps. An illustration of this card appears in Figure 4-31. For specifications on this card, see "System Specifications."
The MGX-SMFIR-8-155-LC is an eight-port, intermediate range back card providing a physical single-mode fiber optic SONET/SDH OC-3/STM-1 interface that conforms to ANSI T1.105, GR-253-CORE, and ITU-T G.957 standards. This interface uses LC connectors, and redundant configurations are supported through Y-cables or APS. See Figure 4-32 for an illustration of the OC-3 back card. For specifications on this card, see "System Specifications."
The MGX-SMFIR-8-155-LC is an eight-port, long range back card providing a physical single-mode fiber optic SONET/SDH OC-3/STM-1 interface that conforms to ANSI T1.105, GR-253-CORE, and ITU-T G.957 standards. This interface uses LC connectors, and redundant configurations are supported through Y-cables or APS. See Figure 4-33 for an illustration of the OC-3 back card. For specifications on this card, see "System Specifications."
The MGX-MMF-8-155-MT is an eight-port back card providing a physical multi-mode fiber optic SONET/SDH OC-3/STM-1 interface that conforms to ANSI T1.105, and ITU-T G.957 standards. This interface uses an MTRJ connector, and redundant configurations are supported through APS. See Figure 4-34 for an illustration of the OC-3 back card. For specifications on this card, see "System Specifications."
The MGX-AXSM-16-T3E3 is a double-height dual-role card that serves as a trunk or a UNI, and provides 16 T3 or E3 lines. An illustration of the card appears in Figure 4-35. For card specifications, see "System Specifications."
The MGX-SMB-8-T3 is an eight-port T3 back card with SMB connectors. An illustration of the card appears in Figure 4-36. For card specifications, see "System Specifications."
The MGX-SMB-8-E3 is an eight-port E3 back card with SMB connectors. An illustration of the card appears in Figure 4-37. For card specifications, see "System Specifications."
The MGX-AXSM-1-2488 is a double-height dual-role card that serves as a trunk, and provides 1 OC-48 or STM-16c,1 line at 2488 Mbps. An illustration of the card appears in Figure 4-38. For card specifications, see "System Specifications."
The MGX-SMFSR-1-2488 is a short range single-height back card with 1 OC-48c or STM-16 and SC connectors. An illustration of the card appears in Figure 4-39. For card specifications, see "System Specifications."
The MGX-SMFLR-1-2488 is a long range single-height back card with 1 OC-48c or STM-16 and SC connectors. An illustration of the card appears in Figure 4-40. For card specifications, see "System Specifications."
The MGX-SMFXLR-1-2488 is an extended long range single-height back card with 1 OC-48c or STM-16 and SC connectors. An illustration of the card appears in Figure 4-41. For card specifications, see "System Specifications."
The description of the LEDs on the PXM45 card appear in Table 4-1Table 4-2.
| Type of LED | Color | Meaning |
|---|---|---|
CNTRLR PORT LED | Green Red Yellow | Green indicates the Controller port is active. |
| Red indicates a Major alarm on this port. | |
| Yellow indicates a Minor alarm on this port. | |
Off indicates the port has not been activated (upped). | ||
SYSTEM STATUS | Green Yellow
Red | Blinking green indicates the card is in the active state. |
Slow blink yellow indicates the card is in the standby state. | ||
Fast blink yellow indicates the card is in the boot state. | ||
Solid red indicates either the card is in the Reset state, the card has failed, or that a back card is missing. | ||
Blinking red indicates the card is downloading new software. | ||
CRIT | Blue | Blue indicates a Critical Network alarm in the node. |
MJ | Red | Red indicates a Major Network alarm in the node. |
MN | Yellow | Yellow indicates a Minor Network alarm in the node. |
HIST (History) | Green | Green indicates a network alarm occurred, but has been cleared. |
ACO (Alarm Cut-Off) | Yellow | Yellow indicates the ACO button was pushed to clear the audible alarm indicator, but the alarm condition still exists. |
DC-A | Green Off | Green indicates that the power supplies in tray "A" are functioning. |
Off indicates that power supply tray "A" is empty (no power modules). | ||
DC-B | Green Off | Green indicates that the power supplies in tray "B" is empty. |
Off indicates that power supply tray "A" is empty (no power modules). | ||
ENET | Green | Blinking green indicates that there is activity on the LAN Control Port. |
The upper card set cables run to the upper cable management panel, and the lower card set cables run to the bottom cable management panel. Figure 4-42 shows cables routed through the upper cable management panel. Figure 4-43 shows the upper and lower cable management panels mounted on the back of the system.
The examples in this section illustrate the following ways in which you can connect a terminal to the MGX 8850 switch:
For further information on the parts necessary for terminal connection, refer to "Cabling Summary." For instructions on how to configure the switch, refer to Cisco MGX 8850 Switch Software Configuration Guide, Release 2.
Modem Connection to the Switch
Before applying power to the MGX 8850 switch, check the following items:
1. System has proper grounding.
2. AC or DC power sources are correctly installed.
3. All cards are locked in the correct slots.
4. All cables are secure.
5. Control terminal is connected.
After the preceding checks, turn on the power by turning on the circuit breakers on the system and the branch circuit. Check the following:
1. At the front of the unit, the status light on the PXM45 should be green.
2. For an AC-powered system, the "AC" and "DC" LEDs on each power supply should be green.
3. For a DC-powered system, the "DC OK" LED on the DC PEMs should be on.
4. After each service module comes up, the status LED should show that the card is in standby.
5. When power is turned on, verify that all fans are running by listening or feeling for air movement.
6. After the system comes up, execute the dsppwr command.
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Note Neither the AC power supplies nor any other components have test points for checking power supply voltages. For a visual check, observe whether the AC OK LED and DC OK LED are lit. |
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Note If you remove and reseat a back card or change it for another card, reset the related front card. |
Posted: Mon Oct 2 10:50:19 PDT 2000
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