Table Of Contents
Enclosure and Card Installation
Before You Begin
Open Rack Configuration
Installation Tools
Safety Considerations
Mounting the Enclosure Modules
Considerations for Mounting the MGX 8950 Modules
Installing the Switch
Stacking Order for System Modules
Removing a Front Card
Removing a Back Card
Removing an AC Power Supply
Installing the System
Installing the AC Power Trays
Installing DC PEMs
Installing AC Power Supplies
Installing the Air Intake Plenum
Installing the Lower Fan Tray
Installing the Card Cage
Installing the Upper Fan Tray
Installing the Exhaust Plenum
Installing the Cable Management Hardware
Installing Fan Tray Power Cabling
Installing Power Interconnect Cables for AC
Connecting AC Power to the Switch (North America)
Connecting AC Power to the Switch (International)
Installing Power Interconnect Cables for DC
Connecting DC Power to the Switch
Before You Install Front or Back Cards
Installing the Front and Back Cards
Installing a Front Card
Installing a Back Card
APS Assembly (Optional)
Connecting Back Cards to the APS Connector
Installing the APS Assembly into the Card Cage
Removing a Back Card from an Installed APS Assembly
Inserting a Back Card into an Installed APS Assembly
Removing the APS Assembly from the Card Cage
XM-60 Switching Module
Processor Switching Module
PXM45/B Front Card
PXM45/B User Interface Back Card
Making External Clock Connections
Optional RJ-45 to Wire-wrap Adapter
Alarm Output Connection
PXM-HD Processor Switching Module Hard Drive Card
ATM Switch Service Modules
AXSM-4-622/B
SMFLR-2-622/B Back Card
SMFIR-2-622/B Back Card
AXSM-16-155/B
SMFIR-8-155-LC/B Back Card
SMFLR-8-155-LC/B Back Card
MMF-8-155-MT/B Back Card
SMB-4-155 Back Card
AXSM-16-T3E3/B
SMB-8-T3
SMB-8-E3
AXSM-1-2488/B
SMFSR-1-2488/B
SMFLR-1-2488/B
SMFXLR-1-2488/B
RPM-PR (Route Processor Module)
LED Indicators for the PXM45/B Cards
Routing Data Cables
Connecting the Terminal to the MGX 8950 Switch
Initial Start-up of the MGX 8950 Switch
Enclosure and Card Installation
This chapter describes how to install the hardware components that make up the MGX 8950 switch. Most of the information in this chapter applies to installing the components in an open rack configuration. Information about installing the Cisco cabinet configuration is given in Chapter 3, "Site Preparation."
Although this manual assumes that you already have a plan for your network and for the location of your cards, this chapter discusses certain planning issues that you should be aware of when installing the MGX 8950 switch. A list of the physical and electrical characteristics of the switch is given in Appendix A, "System Specifications."
Before You Begin
The MGX 8950 switch is shipped in one of two configurations:
•
Cisco cabinet configuration—All components are shipped pre-installed in a Cisco cabinet (minimal installation instructions).
•Open rack configuration—Individual components are shipped ready for installation in a customer-supplied open rack (extensive installation instructions).
Open Rack Configuration
In the open rack configuration, the individual components are shipped with the cards and power modules installed in the card cage, and are tested according to customer specifications before they are shipped.
Note The installation instructions for the open rack configuration begin with steps for removing the cards and power modules on the assumption that a mechanical lift is not available.
If you are doing an open rack installation and a mechanical lift is not available, you will need to
•Remove the cards and power modules from the card cage before installing the units to lessen the weight.
•Record the location of all the cards and power modules before you remove them.
If you are installing an MGX 8950 switch in the same open rack as other components, install it at the bottom of the chassis.
Installation Tools
The installation tools are as follows:
•Small- and medium-sized flat-blade screwdrivers
•Small- and medium-sized phillips screwdrivers
•A powered screwdriver (optional)
•A three-in-one tool with the following heads as shown in Figure 4-1:
–A flat head for unlatching front card ejectors
–A hex head for unlatching the card cage door
–A phillips head for loosening and tightening the back card captive screws
Figure 4-1 3-in-1 Tool
Safety Considerations
Observe the following safety considerations when installing the MGX 8950 switch:
•Install the switch only in a restricted access area.
•Because of the high leakage current, you must install an earth ground connection before connecting the power supply.
•The main chassis earthing conductor must be a minimum of No. 6 AWG stranded copper wire, rated at a minimum of 90 degrees Celsius.
•The maximum recommended ambient temperature must not exceed 40 degrees Celsius.
Mounting the Enclosure Modules
The minimum distance between left and right mounting rails (as you face the rack) must be 17.75 inches or 45.08 cm. (Some 19-inch racks have only 17.50 inches between rails.) The width of the enclosure modules, such as the card cage and fan tray 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 offers special adapter brackets that can be purchased separately. The 19-inch rack version appears in Figure 4-2.
Figure 4-2 MGX 8950 Switch (AC Version with Redundant AC Power Tray)
You can attach the enclosure modules to the mounting rails at the following points on the modules:
•At the front, using the front flanges on each module. The flanges are visible in Figure 4-2.
•At approximately midpoint, attach brackets to the modules, and then attach the modules to mounting rails. For 23-inch racks, order the special adapter brackets from Cisco.
The mounting rail locations Figure 4-3 comply with racks that require mounting on front or middle rear, and rear mounting rails. A front view of the mounting rails is shown in Figure 4-4.
Figure 4-3 Mounting Rail Distances
Figure 4-4 Rack Mounting Dimensions, Front View
Considerations for Mounting the MGX 8950 Modules
When you install the MGX 8950 modules, keep in mind the following considerations:
1. The PXM45/B back card has a disk drive on it; therefore, you should avoid removing it. If you remove a PXM45/B back card, handle it with care to prevent disk damage.
2. On AC-powered units, remove the power supplies before installing the power supply tray.
3. Because of the weight and bulk of the card cage, use two or more people, or a mechanical lift, to install it.
4. When installing a module above another module, do not drag it across the top of the module beneath it. Lower the module to rest only after it is positioned completely in place.
5. A vertical gap of 0.047 to 0.077 inches (0.119 to 0.196 cm), or about 1/16 inch, must exist between all modules to allow for 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.
Caution Do not use a power screwdriver on captive screws.
Caution Do not rest the chassis on its horizontal card guide flanges.
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.
Caution The location of the rack must allow air to flow unrestricted in and out of the node.
Warning Verify that the chassis is not receiving power while you are installing the components.
Warning Before handling any cards, ground yourself to the card cage with a wrist strap.
Warning When moving a Cisco-supplied cabinet, do not push the cabinet at its sides. Instead, grip its front or back edges.
Installing the Switch
This section describes how to install the MGX 8950 modules in an open rack.
For open rack installations, Cisco recommends that you remove the cards and AC power supplies from the card cage before installing the unit. Therefore, this section begins with the steps for removing and re-installing these items.
The installation sequence is as follows:
1. Remove all cards (except the PXM45/Bs) 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 the "Stacking Order for System Modules" section and according to the instructions in the "Installing the System" section later in this chapter.
Stacking Order for System Modules
System modules must be configured in the following sequence, beginning at the bottom (see Figure 4-5):
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
Figure 4-5 Component Locations in an MGX 8950 Switch (AC Version)
Removing a Front Card
Single-height front cards have a latch on the ejector at the top of the front panel to secure them into the card cage (see Figure 4-6).
Double-height front cards have a latch on the ejector at both the top and the bottom of the front panel.
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.
Figure 4-6 Front Card Extractor Latch
Perform the following steps to remove a front card:
Step 1 Press the tip of a small, flat-blade screwdriver into the slot of the extractor lever until the latch springs open approximately 10 degrees.
On a single-height card, do this at the top.
On a double-height card, do this at the top and the bottom.
Step 2 To separate the card from the backplane connector, pull the extractor lever(s) out.
On a single-height card, do this at the top.
On a double-height card, do this at the top and the bottom simultaneously.
Step 3 Carefully pull the card out of the card cage and store it in a safe location.
Removing a Back Card
A captive screw at the top and bottom of the faceplate of each back card secures the card to the card cage. The extraction levers let you pull the card from the backplane connector after you loosen the captive screws.
Note Older cards require the use of a flat-blade screwdriver; however, on new cards you can use either a Phillips or a flat-blade screwdriver.
Perform the following steps to remove a back card:
Step 1 Loosen the two captive screws in the faceplate using a screwdriver.
Step 2 Pull out both extractor levers simultaneously to pull the card from the backplane connector.
Step 3 Carefully pull the card out of the card cage and store it in a safe location.
To remove an APS assembly, see the "Removing the APS Assembly from the Card Cage" section in this chapter.
Removing an AC Power Supply
Removing AC power supplies makes the AC power tray installation 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.
Perform the following steps to remove an AC power supply.
Step 1 Insert a small flat-blade (.20 inch wide maximum) screwdriver in the access hole at the top of the grille. Then, rotate the screwdriver in either direction until the latch opens. (See Figure 4-7.)
Figure 4-7 Removing an AC 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 bottom front of the power supply that you want to remove. (See Figure 4-8.)
Step 5 Grip the handle and pull straight out to remove the power supply.
Figure 4-8 AC Power Supply
Installing the System
This section provides the instructions for installing the power modules, system modules, power cables, and the cable manager.
After you have read and performed the necessary tasks in the previous sections, "Before You Begin" and "Considerations for Mounting the MGX 8950 Modules", proceed with the installation instructions for each module as described in this section.
If you are using a 23-inch rack, attach the necessary brackets to the applicable modules before installing the module.
Installing the AC Power Trays
Note For optimum performance, Cisco recommends installing dual AC power systems for full redundancy.
Perform the following steps to install the ac power trays:
Step 1 For an AC-powered system, install the optional AC power trays first.
Their height is three rack-mount units (three RUs equals 5.25 inches or 13.34 cm). (See Figure 4-10.)
Step 2 For a mid-mount installation, insert each mounting screw from inside the power tray so that the nut is on the outside of the tray.
This approach is necessary to allow room for power supply clearance in slots A and F (see Figure 4-9).
Figure 4-9 Power Supply (Conceptual) Slot Identifiers
Figure 4-10 Optional AC Power Tray
Step 3 While you secure the front of the power supply tray with the front screws, hold the adjacent front flange of the tray slightly to the outside so the hinged door can freely open and close. (See Figure 4-11.) The space between the right-angle edge of the flange and the edge of the hinged door should be approximately 0.030 inches (about the thickness of a thumbnail).
Step 4 Repeat Steps 1 through 3 to install the second power tray.
Figure 4-11 AC Power Tray Front Flange
Installing DC PEMs
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 bottom as viewed from the rear of the module. (See Figure 4-12 and Figure 4-13.)
For important information on removing a PEM in a redundant setup with the power on, see the "Swapping a Primary or Redundant DC PEM with Power On" section later in this chapter.
Figure 4-12 DC-PEM
Figure 4-13 DC-PEMs Installed in Back of the Air Intake Module
Note A vertical gap (0.047-0.077 inch [about 1/16 inch] or 0.119 -0.196 cm) must be left between all modules to allow for module removal.
Installing AC Power Supplies
The AC power supply requirements for the node depend on the following criteria:
•The number of double-height cards installed in the node
•Whether the node is a single AC power cord system or a dual AC power cord system
Use the guidelines in Table 4-1 for the AC power supply requirements.
Table 4-1 Node AC Power Supply Requirements
Number of Cards Installed
|
Number of Power Supplies Required per Node
|
1 to 5
|
2 AC power supplies (minimum) for a dual or a single AC power cord system.
|
5 to 9
|
4 AC power supplies (minimum) for a dual AC power cord system
(2 on each power cord).
3 AC power supplies (minimum) for a single AC power cord system.
|
10 or more
|
6 or more AC power supplies for a dual AC power cord system.
4 AC power supplies for a single power cord system.
|
Perform the following steps to re-install power supplies that you removed:
Step 1 Slide each power supply into the tray.
You will encounter a slight resistance as you slide the power supply; push it in completely to ensure full connector mating.
Step 2 Secure each supply to the tray by tightening the captive screw at the front bottom 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.
Installing the Air Intake Plenum
Install the air intake plenum at the bottom of the stack on a DC system or above the AC power tray on an AC system. (See Figure 4-14.)
Note A vertical gap of 0.047 to 0.077 inches (0.119 to 0.196 cm) or about 1/16 inch must exist between all modules to allow for module removal.
Figure 4-14 Air Intake Plenum
Installing the Lower Fan Tray
Install the lower fan tray above the air intake plenum with the arrow on the fan tray pointing up as shown in Figure 4-15.
Note A vertical gap of 0.047 to 0.077 inch (0.119 to 0.196 cm) or about 1/16 inch must exist between all modules to allow for module removal.
Figure 4-15 Fan Tray
Installing the Card Cage
Install the card cage 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.
Tip 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 into place.
Tip 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 and tighten them. Then, remove the screwdriver from between the fan tray and card cage.
Note A vertical gap of 0.047 to 0.077 inches (0.119 to 0.196 cm) or about 1/16 inch must exist between all modules to allow for module removal.
Installing the Upper Fan Tray
Install the upper fan tray above the card cage. See Figure 4-15, 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.
Note A vertical gap of 0.047 to 0.077 inches (0.119 to 0.196 cm) or about 1/16 inch must exist between all modules to allow for module removal.
Installing the Exhaust Plenum
Install the exhaust plenum above the upper fan tray.
If you need to install the cable manager, proceed to the "Installing the Cable Management Hardware" section before you do the tasks in the "Installing Fan Tray Power Cabling" section.
Note A vertical gap of 0.047 to 0.077 inches (0.119 to 0.196 cm) or about 1/16 inch must exist between all modules to allow for module removal.
Installing the Cable Management Hardware
The cable management system consists of two identical, horizontal cable managers, left-side and right-side mounting brackets, and screws.
Perform the following steps to install the cable manager:
Step 1 Using the provided #10-32 screws, attach the two mounting brackets to the right and left sides of the rear of the intake and exhaust plenum.
Step 2 Using the provided #10-32 screws, install the cable managers to the mounting brackets. The cable guides on the upper cable manager must be on the bottom. The cable guides on the lower cable manager must be on the top. (See Figure 4-16.)
Note Fiber optic cabling and copper cabling follow the same paths on the cable manager.
Figure 4-16 Cable Management Assembly at the Back of the System
Installing Fan Tray Power Cabling
There are nine fans in the fan power tray, each dissipating 8W (0.16A) of -48V of power (72W per tray). Each fan has current limiting protection internal to the fan circuit. The -48V power to each fan is protected by a 0.75 PTC located in the backplane.
The fan trays receive power from the backplane through a fan power cable. See Figure 4-17 for an illustration of the fan power cable and Figure 4-18 for an illustration of the fan power connections.
You will need the following cables for fan cable installation:
•Cisco Systems part number 72-2083-xx (46-inch cable)
•Cisco Systems part number 72-2565-xx (12-inch cable)
Figure 4-17 Fan Power Cable
Perform the following steps to install the fan power cabling:
Step 1 Insert the male connector of the fan power cable (46-inch cable) into the connector receptacle (labeled F1) located at the bottom of the card cage, and push the connector in to seat it.
Step 2 Insert the connector at the other end of the cable into the upper fan tray receptacle, and push the connector in to seat it.
Step 3 Tighten the captive screws on the connector. Do not use a power tool.
Step 4 Insert the male connector of the lower fan tray cable (12-inch cable) into the connector receptacle (labeled F2) located at the bottom of the card cage, and push the connector in to secure it.
Step 5 Insert the connector at the other end of the cable into the lower fan tray receptacle, and push the connector in to secure it.
Step 6 Tighten the captive screws on the connector. Do not use a power tool.
Figure 4-18 Fan Power Connections (AC-Powered Node Shown)
Installing Power Interconnect Cables for AC
A system power cable carries -48 VDC current from an AC power tray to the rear of the card cage (see Figure 4-21). One end of the cable plugs into the card cage in the chassis and the other end of the cable plugs into the AC power supply.
Figure 4-19 Interconnect Cable for AC
The shrouds on the AC cables and the receptacles on the card cage and power trays are keyed to ensure proper connections. Do not attempt to insert cables into shrouds that are not keyed for them.
Note The AC power interconnect cables from each tray must be connected to the backplane. If the cables are not connected, the power supply monitoring circuit will mistake this as voltage failure and will result in a tripped circuit breaker.
You will need the following cables:
•Cisco Systems part number 72-2420-XX
•Cisco Systems part number 72-2421-XX
•Cisco Systems part number 72-2422-XX
•Cisco Systems part number 72-2423-XX
See Table 4-2 and Figure 4-20 for assistance with connecting the AC power tray connectors to the card cage and power trays:
Table 4-2 AC Power Cable Connections
Cable Label
|
Card Cage Connect
|
Cable Label
|
Power Tray Connector
|
Card Cage A1
|
PSA 1
|
PS Tray 1 J1
|
J1 on primary (top) PS Tray
|
Card Cage B1
|
PSB 1
|
PS Tray 2 J1
|
J1 on secondary (bottom) PS Tray
|
Card Cage B2
|
PSB 2
|
PS Tray 2 J2
|
J2 on secondary PS Tray
|
Card Cage A2
|
PSA 2
|
PS Tray 1 J2
|
J2 on primary PS Tray
|
Note Cisco highly recommends that you install and use a redundant AC power supply.
Perform the following procedure to install the interconnect connections for an AC-Powered MGX 8950 switch with a redundant AC power supply:
Caution Do NOT use power tools for this procedure.
Step 1 Insert the connector labeled "Card Cage A1" into the card cage receptacle labeled "PSA 1."
Step 2 Push the connector in to seat it.
Step 3 Tighten the captive screws firmly by hand.
Step 4 Insert the other end of the cable labeled "PS Tray 1 J1" into the primary (top) AC power tray receptacle labeled "J1."
Step 5 Push the connector in to seat it.
Step 6 Tighten the captive screws firmly by hand.
Step 7 Insert the connector labeled "Card Cage B1" into the card cage receptacle labeled "PSB 1."
Push the connector in to seat it.
Step 8 Tighten the captive screws firmly by hand.
Step 9 Insert the other end of the cable labeled "PS Tray 2 J1" into the secondary (bottom) AC power tray receptacle labeled "J1."
Step 10 Tighten the captive screws firmly by hand.
Step 11 Insert the connector labeled "Card Cage B2" into the card cage receptacle labeled "PSB 2."
Push the connector in to seat it.
Step 12 Tighten the captive screws firmly by hand.
Step 13 Insert the other end of the cable labeled "PS Tray 2 J2" into the secondary AC power tray receptacle labeled "J2."
Push the connector in to seat it.
Step 14 Tighten the captive screws firmly by hand.
Step 15 Insert the connector labeled "Card Cage A2" into the card cage receptacle labeled "PSA 2."
Push the connector in to seat it.
Step 16 Tighten the captive screws firmly by hand.
Step 17 Insert the other end of the cable labeled "PS Tray 1 J2" into the primary AC power tray receptacle labeled "J2."
Figure 4-20 shows the AC Interconnect Cable Connections for Power Supply A (PSA) in Tray #1 and Power Supply B (PSB) in Tray #2.
Figure 4-20 AC Interconnect Cable Connections
for Primary and Secondary Power Supplies
Figure 4-21 Interconnect Power Connections for AC
Connecting AC Power to the Switch (North America)
If you removed the AC power supplies before installing the AC power tray, re-install them in the same locations when the system arrived. If necessary, use the steps in the "Installing AC Power Supplies" section. The AC power receptacle on the system is an NEMA locking (see Figure 4-22). See Figure 4-23 for an illustration of AC power connections.
Figure 4-22 AC Power Cable (North America))
Note The AC voltage range is 180-264 VAC.
Cisco can provide AC power cords with the following types of AC wall plugs:
•30A NEMA L620, 3-prong plug (United States)
•30A IEC 309 plug (Europe, Australia, New Zealand)
Perform the following steps to install the North American AC power cord:
Step 1 Insert the female connector into the AC receptacle on the PS tray.
Step 2 Twist the plug to the right to secure it.
Step 3 Insert the other end of the power cable into the wall outlet.
Step 4 Repeat Steps 1 through 3 to connect the other AC cable to the remaining AC power tray.
Figure 4-23 AC Power Connections (with redundant power supply), North America
Connecting AC Power to the Switch (International)
Caution Verify the branch circuit power is off before you insert the power cable into the wall outlet.
Note Use Cisco Systems part number PWRCD-30A-EU for the AC power cable with an IEC 309 plug.
Perform the following steps to install the International AC power cable. (See Figure 4-24, Figure 4-25, and Figure 4-26):
Step 1 Insert the female connector into the AC tray receptacle.
Step 2 Twist the plug clockwise to secure.
Step 3 Loosen the nut on the black strain relief clamp and then slide the metal housing over the plug.
Step 4 Insert the metal tabs (located on both sides of the housing) into the slots found on either side of housing into receptacle and then push down on the housing to secure it.
Step 5 Tighten the thumbscrew at the top of the housing by hand.
Step 6 Tighten the nut on the strain relief to secure the cable to the housing.
Step 7 Insert the other end of the cable into the wall outlet.
Step 8 If you are using a secondary (redundant) power supply, repeat Steps 1 through 7 for the other AC power cable.
Figure 4-24 AC Power Tray Cable (International)
Figure 4-25 AC Power Cable IEC 309 Plug (International)
Figure 4-26 AC Power Connections (with redundant power supply), International
Installing Power Interconnect Cables for DC
A system power cable carries -48 VDC current from a DC-PEM to the backplane (see Figure 4-28).
Caution The DC power interconnect cables from each PEM must be connected to the backplane. If the cables are not connected, the power supply monitoring circuit will mistake this as voltage failure and will result in a tripped circuit breaker.
Figure 4-27 Cable Assembly for System Power
Caution The connectors on the DC cables are keyed to ensure proper cabling to the DC PEM. Improper cabling may cause damage to the system.
Figure 4-28 diagrams in detail the cabling for the DC system.
Use the following cables to install interconnect cables for DC systems:
•Cisco Systems part number 72-2424-XX
•Cisco Systems part number 72-2425-XX
•Cisco Systems part number 72-2426-XX
•Cisco Systems part number 72-2427-XX
Refer to Table 4-3 and Figure 4-28 to assist you with connecting the DC power tray connectors to the card cage:
Table 4-3 Interconnect Power Connections for DC
Cable Label
|
Card Cage Connection
|
Cable Label
|
PEM Connection
|
Card Cage A1
|
PSA 1
|
PEM 1 J1
|
J1 on primary (bottom) PEM
|
Card Cage B1
|
PSB 1
|
PEM 2 J1
|
J1 on secondary (top) PEM
|
Card Cage B2
|
PSB 2
|
PEM 2 J2
|
J2 on secondary PEM
|
Card Cage A2
|
PSA 2
|
PEM 1 J2
|
J2 on primary PEM
|
Note Cisco highly recommends that you install and use a redundant DC power supply.
Perform the following procedure to install the interconnect connections for an DC-Powered MGX 8950 switch with a redundant DC power supply:
Caution Do NOT use power tools for this procedure.
Step 1 Insert the connector labeled "Card Cage A1" into the card cage receptacle labeled "PSA 1."
Push the connector in to seat it.
Step 2 Tighten the captive screws firmly by hand.
Step 3 Route the cable outside the cable management brackets, then insert the other end of the cable labeled "PEM 1 J1" into the primary (bottom) PEM receptacle labelled "J1."
Push the connector in to seat it
Step 4 Tighten the captive screws firmly by hand.
Step 5 Insert the connector labeled "Card Cage B1" into the card cage receptacle labeled "PSB 1."
Push the connector in to seat it.
Step 6 Tighten the captive screws firmly by hand.
Step 7 Insert the other end of the cable labeled "PEM 2 J1" into the secondary (top) PEM receptacle labeled "J1."
Step 8 Tighten the captive screws firmly by hand.
Step 9 Insert the connector labeled "Card Cage B2" into the card cage receptacle labeled "PSB 2."
Push the connector in to seat it.
Step 10 Tighten the captive screws firmly by hand.
Step 11 Insert the other end of the cable labeled "PEM 2 J2" into the secondary (top) PEM receptacle labeled "J2."
Push the connector in to seat it.
Step 12 Tighten the captive screws firmly by hand.
Step 13 Insert the connector labeled "Card Cage A2" into the card cage receptacle labeled "PSA 2."
Push the connector in to seat it.
Step 14 Tighten the captive screws firmly by hand.
Step 15 Route cable outside the cable management system brackets, then insert the other end of the cable labeled "PEM 1 J2" into the primary (lower) PEM receptacle labeled "J2."
Figure 4-28 shows the Interconnect Cable Connections for Power Supply A (PSA) in DC PEM Assembly (ASM) #2 and Power Supply B (PSB) in DC PEM Assembly (ASM) #1.
Figure 4-28 DC Interconnect Cable Connections (Detailed)
Figure 4-29 Power Interconnect Connections for DC
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" later in this chapter.
Connecting DC Power to the Switch
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 the "Power and Grounding" section of Chapter 3, "Site Preparation."
Each primary or redundant DC source connects to one DC PEM in the system. Each DC PEM accepts two 50A service feeds from the same DC source. 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 of at least 90 degrees Celsius.
A plastic cover visible on the left of Figure 4-30 is used to cover terminal block connections. Two Phillips screws secure this cover to the PEM.
Use the visual information in Figure 4-30 and Figure 4-31 to connect the DC wiring.
Perform the following steps to connect DC power to the switch:
Step 1 Cut the appropriate wire lengths to accommodate a terminal lug that can be attached to the PEM terminal block. Cisco recommends using the Panduit LC AS6-10-L.
Step 2 Strip the insulation back 0.25 inches (6 mm).
Step 3 With power off at both the switch and the source, attach each wire with a terminal lug to the #10-32 lugs on the PEM terminal block. (See Figure 4-31.)
Step 4 Repeat Steps 1 through 3 for the secondary PEM.
Figure 4-30 DC-PEM
Figure 4-31 Placement of DC Wiring Lugs on the DC-PEM
Step 5 Turn the power switch on. Verify the LEDs on the front of the card are lit and the fans spin up.
Figure 4-32 Primary and Secondary DC PEMs
Swapping a Primary or Redundant DC PEM with Power On
If necessary, you can replace either a primary or a redundant PEM with power on. Perform the following steps to remove a PEM with system power on:
Step 1 Turn off the circuit breaker on only the PEM you intend to replace.
Step 2 Turn off both branch circuits at the DC source (the distribution box, for example) for the correct branch.
Step 3 Disconnect the three DC source wires for both inputs at the wiring block on the PEM.
Step 4 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 5 Remove the PEM.
Perform the following steps to install a PEM in a system with power on:
Step 1 Make sure the circuit breaker is in the off position.
Step 2 Insert the PEM and tighten the captive mounting screws.
Step 3 Connect both system power cables first at the PEM.
Note Step 4 only applies if you disconnected the backplane connector in Step 4 of the previous procedure; otherwise, proceed to Step 5.
Step 4 Tighten the connector screws.
Step 5 Attach both sets of the three DC source wires (three wires each set) at the wiring block on the PEM.
Step 6 Turn on the DC power at the circuit branch sources.
Step 7 Turn on the circuit breaker of the PEM.
Before You Install Front or Back Cards
Before you install a front or back card, be sure to:
•Inspect the backplane for bent pins or bent dividers between pin rows (see Figure 4-33). If the backplane has bent pins, do not install a card in that slot. Installing a card into a damaged backplane slot will damage the connector on the card.
Figure 4-33 Backplane Inspection Check Points
•Inspect the card for damaged holes on the connector. If the connector has damaged holes, do not install the card. Installing a card that has a damaged connector will damage the backplane. Return damaged cards to Cisco.
Figure 4-34 Damaged Connectors on Card
Installing the Front and Back Cards
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 PXM45/Bs occupy, and slots 8, 9, 25, and 26 which are reserved for the XM-60.
Warning To prevent damage to the cards from static electricity, wear the supplied wrist strap and connect it to any convenient metal contact on the system or card cage before you touch any cards.
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/B back card slot (upper or lower bay of slot 7 or 8), damage to the card and backplane may result.
Installing a Front Card
Perform the following steps to install a front card:
Step 1 Position the rear edge of the card over the appropriate slot card guide at the top and bottom of the cage.
Note Make sure you verify that the intended slot for the card is the correct slot before you slide the card into the slot.
Step 2 Carefully slide the card all the way into the slot.
Step 3 Press both extractor levers until they snap into the vertical position.
Note The card should slide in and out of the slot with only slight friction. Do not use force. Investigate any binding, blocking, or excessive friction.
Installing a Back Card
Perform the following steps to install a back card:
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 it with the correct daughter card.
Step 1 Make sure the two extractor levers are set in. As you move the card, the levers should be flush with the vertical edge of the back card, or the card will not slide properly.
Step 2 Carefully slide the card all the way into the slot.
Step 3 Push the card into the connector until the faceplate 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.
Tip If you are having difficulty inserting the screws, look from the side to check the alignment of the holes and screws.
APS Assembly (Optional)
An Automatic Protection Switching (APS) assembly (see Figure 4-35) consists of two optical AXSM back cards, an active card and a standby card, which are connected using an APS connector (Part No. MGX-APS-CON-8950). The APS assembly can then be installed in the card cage.
The APS connector has two features to help ensure proper connection.
•An alignment slot to align the each back card into the APS connector (see Figure 4-35).
•Guide tabs to help position the pins on the APS connector with the holes on the back cards.
Note To ensure reliable operation, Cisco recommends that you connect both back cards to the APS connector before installing the APS assembly in the card cage.
Note Both a working line and a protection line must be connected on each back card for APS to work. (However, you should only connect the lines after the APS assembly is installed in the card cage.) The cards at each end point of each line must also be configured for APS, and the function (working or protection) of each line must be the same at both end points for each line.
Connecting Back Cards to the APS Connector
Perform the following steps to connect back cards to an APS connector to form an APS assembly (see Figure 4-35):
Step 1 Position the edge of the back card into the alignment slot of the APS connector, and use the guide tabs on the APS connector to align the holes on the back card with the pins on the APS connector.
Step 2 Carefully install the back card into the APS connector by pushing with a straight motion firmly until it is securely connected.
Caution A rocking motion during connector mating can bend or damage the APS connector pins.
Step 3 To install a second card (see Figure 4-36), repeat steps 1 and 2.
Figure 4-35 APS Assembly Features
Installing the APS Assembly into the Card Cage
Perform the following steps to install the APS assembly into the card cage:
Note The cards should be securely connected to the APS connector before you install the APS assembly into the card cage.
Step 1 Position the APS assembly into the appropriate card slots of the card cage.
Note The extractor levers must be closed (flush with the vertical edge of the back cards) (see Figure 4-35 and Figure 4-36) or the APS assembly will not slide into the card cage properly.
Step 2 Slide the APS assembly all the way into the slot until it is properly seated in the backplane. The faceplates of the back cards are flush with the front of the card cage when the APS assembly is properly seated.
Step 3 Tighten the captive screws on the back cards with the appropriate screw driver. If you have difficulty inserting the captive screws, verify that the screws are aligned with the holes.
Step 4 Verify that the APS connector is installed properly by executing the dspapsbkplane command from the CLI. Refer to the Cisco MGX 8850 and MGX 8950 Routing Switch Command Reference, Release 2.1 for information on how to use dspapsbkplane.
Figure 4-36 APS-Connected Back Cards
Removing a Back Card from an Installed APS Assembly
A single back card can be removed from the APS assembly while it is still in the card cage, using the standard procedure described in the "Removing a Back Card" section earlier in this chapter.
Inserting a Back Card into an Installed APS Assembly
A single back card can be inserted into the APS assembly while it is still in the card cage, using the standard procedure described in the "Installing a Back Card" section earlier in this chapter.
Removing the APS Assembly from the Card Cage
Perform the following steps to remove the APS assembly from the card cage:
Step 1 Remove either one of the APS-connected cards from the card cage using the standard procedure described in the "Removing a Back Card" section earlier in this chapter.
Step 2 Remove the other card from the card cage using the standard procedure described in "Removing a Back Card" earlier in this chapter. The APS connector will still be connected to the second card when it is removed and will come out of the card cage with the card.
Step 3 Carefully separate the second card from the APS connector by pulling it out with a straight motion.
Note A rocking motion during separation can bend or damage the APS connector pins.
XM-60 Switching Module
The XM-60 is a single-height card that provides support for 60, 120, 180, or 240 Gbps of cross-point switching capacity. The XM-60 also provides an aggregate bandwidth of 10 Gbps per slot.
Additional XM-60 features are as follows:
•Extracts in-band requests from the AXSM and PXM45/B cards
•Schedules and grants access to the AXSM and PXM45/B cards
•Performs spatial multicast functions to the egress slots
•Provides counters for error statistics on a per serial link basis
•Provides an interface to the CPU on the PXM45/B cards for statistic collections
•Separation from control processor which allows data forwarding in the event of control card failure
•Hot-card insertion and removal
Note The common instructions for installing any card in this system appear in an earlier section, "Before You Install Front or Back Cards".
Caution Handle the XM-60 card very carefully; do not drop or bump the card.
Figure 4-37 XM-60 Switching Module
Processor Switching Module
This section describes the requirements for installing the Processor Switching Module (PXM45/B) card set and the features of each associated back card. The PXM45/B card set consists of the PXM45/B 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/B for switch and network control, refer to the Cisco MGX 8850 and MGX 8950 Routing Switch Software Configuration Guide. For lists of the physical details of PXM45/B cards, standards compliances, and so on, see Appendix A, "System Specifications"
Note The common instructions for installing any card in this system appear in an earlier section, "Before You Install Front or Back Cards".
Caution Handle the PXM45/B front card very carefully; do not drop or bump the card.
Warning If you accidentally insert a back card into the wrong slot, remove it and check for bent pins on the backplane and the card.
PXM45/B Front Card
The PXM45/B is the controller for the switch. The PXM45/B features are as follows:
•Environmental monitoring (cabinet temperature, fan speed, and power supply voltages).
•Hot-swappable, 1:1 redundancy.
For descriptions of system configuration tasks and how to modify partitioning, specify APS, and add UNI-port connections, refer to the Cisco MGX 8850 and MGX 8950 Routing Switch Software Configuration Guide. An illustration of the PXM45/B front card appears in Figure 4-38.
Figure 4-38 PXM45/B Front Card
PXM45/B User Interface Back Card
The PXM45/B User Interface card (PXM-UI-S3) connects the switch to the 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/B. See Figure 4-39 for the connectors on the PXM-UI-S3. For specifications on this card, see Appendix A, "System Specifications."
The back card also provides:
•Two RJ45 connectors for T1 or E1 clock input
•Two RJ45 female connectors for LAN (Ethernet)
•Two RJ45 CP and MP connections
•One DB-15 female connector for alarm interface
•Supports for Stratum 3 network clocking
Figure 4-39 User Interface Card for PXM45/B
Note The LAN2 port is currently not supported.
Making External Clock Connections
If external equipment or a local digital central office is to provide synchronization to the MGX 8950 node, you can connect the external clock source to the PXM-UI-S3 back card. The MP port is used for interconnection to the modem. The PXM-UI-S3 also has two external clock inputs (EXT CLK1 and EXT CLK2, shown in Figure 4-39) which can support either T1 or E1 external clock input, but not both. For redundancy, connect to both ports, using EXT CLK1 as the primary source and EXT CLK2 as the secondary source.
Note For redundant PXM configurations where two PXM-UI-S3 are preset, a Y-cable should be used to connect to the EXT CLK1 input of Slot 7 and EXT CLK1 of Slot 8. For BITS source protection, connect another Y-cable to the EXT CLK2 input of Slot 7 and EXT CLK2 input of Slot 8. See Appendix B, "Cabling Summary" 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 and MGX 8950 Routing Switch Software Configuration Guide.
Optional RJ-45 to Wire-wrap Adapter
The optional RJ-45 to Wire-wrap (see Figure 4-40) adapter allows you to connect an external Building Integrated Timing Supply (BITS) clock source to the PXM UI-S3 card or the PXM UI card using a wire-wrap connection instead of an RJ-45 connection.
Figure 4-40 Optional RJ-45 to Wire-wrap
A shielded cable from the clock source is wire-wrapped to the pins of the adapter. (A shielded clock source cable must be used to ensure EMI containment.) Then the RJ-45 connector of the adapter is plugged into the PXM UI-S3 card or the PXM UI CARD. The eight pins of the adapter are marked and have a one to one correlation to the eight lines on the RJ-45 connector.
Note When you install the RJ-45 to Wire-wrap adapter, you do not need to remove the card from its slot or turn off the power. However, you should wire-wrap the cable conductors to the applicable pins on the adapter before you plug the adapter into the card
To install the RJ-45 to Wire-wrap adapter, perform the following steps:
Step 1 Remove the pin cover from the adapter (see Figure 4-41). (The pin cover provides electrostatic discharge (ESD) shielding.)
Figure 4-41 Removing the Pin Cover from the Adapter
