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This chapter describes how to install the hardware components that make up an MGX 8850 switch. Although the viewpoint of this chapter is that a plan exists for your network and the location of each card, it reviews some of the planning decisions for the switch. For a list physical and electrical characteristics of the switch, see "System Specifications."
The MGX 8850 switch ships either pre-installed in a Cisco closed rack or in separate pieces for installation in an open rack. Most of the instructions in this chapter apply to an open rack installation. For a Cisco rack, you need only the instructions in this chapter that apply to electrical connections and the site preparation instructions in the chapter titled "Site Preparation."
When you receive the switch in individual pieces, the card cage arrives with the cards installed and tested according to its planned configuration. If the unit includes an AC power assembly, the power supplies reside in the appropriate slots in the AC power tray. For a DC-powered system, the DC Power Entry Modules (PEMs) are mounted in the air intake chamber. For ease of installation, you may want to remove the cards or power supplies according to the instructions in the sections titled "Removing a Front Card," "Removing a Back Card," and "Removing an AC Power Supply" respectively. Be sure to record the locations of all components.
The minimum distance between left and right mounting rails as you face the rack is 17.75 inches or 45.08 cm. (The width of the enclosure modules such as card cage, fan tray, and so on, is 17.73 inches.) If a standard 19-inch (48.25 cm) rack cannot provide this space, a 23-inch rack is necessary. 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 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 enclosure modules:
The mounting features also comply with sites that require mounting on both front and rear mounting rails. Refer to Figure 4-2 for the positions of the mounting rails.
This section describes how to install the mandatory and optional modules that make up the enclosure of the MGX 8850 switch. For open rack installations, Cisco advises you to remove the cards and AC power supplies before installing the switch, so this section also contains the steps for removing and installing these items. When you install the modules, keep the following in mind:
1. Due to the presence of a disk drive on each Processor Switching Module (PXM), leave the PXMs in place if possible. If you remove a PXM, handle it with caution to preserve disk alignment.
2. For an AC-powered, mid-mount node, you must remove the AC power supplies.
3. The weight and bulk of even an empty card cage mandate that two or more people install it.
4. One person with a mechanical lift can install the node.
5. 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 when it is all the way in the rack and directly above the module beneath it.
6. With the exception of the exhaust plenum, the vertical spacing between components must be in the range .047"-.077" (about 1/16") or 0.119 cm-0.196 cm. By leaving this space, you can easily remove a single module if necessary.
7. Two installers can maneuver a module to provide the space while driving in the first two screws. If you alone are installing the modules, use a non-abrasive implement to create the space until you have installed the screws (or just the bottom two screws for the modules that have four or eight screws). Note that the tip of a flat-bladed screw driver can scratch the paint.
8. When a module takes four or more screws, install the bottom screws first.
9. If the access around mid-mount installation is too limited, you can use thread-forming screws to pre-thread mounting holes. The pre-threaded holes make screw insertion much easier when you install each module. This technique involves driving a screw into the hole to make the thread then removing it before you install the module.
 | Caution If you use a power-screwdriver, do not use it on any of the captive screws. |
 | Caution When moving a Cisco-supplied cabinet, do not push the cabinet at its sides. Instead, grip its front or back edges. |
| 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 Before handling any cards, ground yourself to the card cage with a wrist strap. |
Each single-height front card has a latch to secure it when the card connects to the backplane. Each double-height card has a latch at the top and the bottom. (See Figure 4-3.)
Step 1 Press the tip of a small, flat-blade screwdriver into the slot in the insertion/extractor lever until the latch springs open by approximately 10°. For double-height cards, repeat this action at the bottom latch.
Step 2 Lift the lever to dislodge the card from the connector.
Step 3 Gently pull the card out of the card cage.
To remove a back card:
Step 1 Use a flat-blade screwdriver to loosen the two retaining screws in the faceplate.
Step 2 Simultaneously pull out both extractor levers to pull the card from the backplane connector after you loosen the screws.
Step 3 Gently pull the card out of the card cage and store it in a safe location.
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 the forthcoming section "Installing the Enclosure Modules." Before executing the following steps, make sure you have a record of the location of each power supply.
Step 1 Remove the air intake grille by inserting a flat-bladed screwdriver in the access hole at the top then rotating the screw until the spring latch opens. (See "Release" in Figure 4-4).
Step 2 Tilt the air inlet grille down to approximately a 45º angle, then lift if out and set it aside. This action exposes the hinged door that serves as the power supply retainer bracket.
Step 3 With a flat-bladed 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 4-5.)
Step 5 Grip the handle, then remove the supply.
Using the guidelines at the beginning of "Mounting the MGX 8850 Modules" in this chapter, install each component according to the steps in this section.
Step 1 If this node requires the brackets for 23-inch rack, attach them to the enclosure modules.
Step 2 For an AC-powered system, install the optional AC power tray. Its height is three rack-mount units (three RUs is 5.25 inches or 13.34 cm). (See Figure 4-6.)
For a mid-mount installation, insert the mounting screws from the inside of the power tray so that the nut is on the outside of the tray, otherwise you cannot install the power supplies in either the first or last power supply trough.
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 "Front Flange" in Figure 4-6. The space between the right-angle edge of the flange and the edge of the hinged door should be close to the thickness of a thumbnail.
Step 3 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. (See Figure 4-7 and Figure 4-8.)
Step 4 Install the air intake module (3 RUs). (See Figure 4-9.)
Step 5 Install the optional booster fan tray if present, otherwise install the spacer unit (1 RU). See Figure 4-10. If you install a fan tray, note the label that says "This Side Up."
Step 6 Install the card cage (10 RUs). 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.
Step 7 Install the mandatory fan tray (1 RU). (See Figure 4-10.) Note the label that says "This Side Up." When you move it into position, be sure the base of the fan tray at the back fully clears the top-rear edge of the card cage beneath it.
Step 8 Install the exhaust plenum (2 RUs).
If you install the cable manager, proceed to the next section, titled "Installing the Cable Manager," before you do the tasks in the section titled "Installing the Fan Power Cabling."
Step 1 Holding the bracket with one hand, position it so the lower flange fits inside the card cage wall. Make sure the screw hole on the bracket aligns with the screw hole on the card cage.
Step 2 Drive in the screw.
Next, use the provided screws to install the cable managers. As Figure 4-11 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.
The fans receive power off the backplane by way of a fan power cable. To reach the backplane connector, the fan power cable D-connector passes through an outer hole at the base of the card cage. At the fan-tray end of the cable, the D-connector plugs into J1---the only connector at the back of the fan power tray. Refer to Figure 4-12 for an illustration of the fan power cable and Figure 4-13 and Figure 4-14 for illustrations of the card cage area with the cabling holes for AC and DC-powered systems. Note that the holes for system power cabling alternate with the smaller holes for fan power. From left to right, the sequence of access holes is system power, fan power, system power, then fan power. Use the access hole on the far right for the upper fan tray.
To install the fan power cabling:
Step 1 With the narrow row of pins in the D-connector on the bottom, use two hands to slip the framed connector through the access hole at the base of the card cage. Move the connector straight towards the backplane so you can guide it through the second, internal guide.
With the D-connector fully inserted in the backplane connector, the captive screws on the frame are clearly aligned with the threaded holes on the chassis.
Step 2 Tighten the captive screws only enough to secure the connector. Do not apply much torque, and do not use a power screw driver.
Step 3 Insert the D-connector in J1 on the fan tray and tighten the captive screws only enough to secure the connector. Do not use a power screw driver.
Step 4 For the mandatory fan tray, position its power cable to run through the channel formed by the mounting bracket on the right.
A system power cable carries current from either a DC PEM or AC-DC power module to the backplane. The cable is the same for either type of power system. (See Figure 4-15.) The end with the metal frame around the D-connector plugs into the larger of the access holes to the backplane. From left to right, the first and third access holes are for system power. See Figure 4-16 for an AC-powered system and Figure 4-17 for a DC-powered system.
Both the AC-power assembly and the DC-power assembly have D-connectors to receive the un-framed connector. No requirement exists for a power cable to connect at either system power connector at the backplane.
To install system power cabling:
Step 1 With the narrow row of pins in the D-connector on the bottom, use two hands to slip the larger connector through the access hole at the base of the card cage.
Step 2 Move the connector straight towards the backplane so you can guide it through the second, internal guide.
When you have fully seated the D-connector in the backplane connector, the captive screws on the frame are clearly aligned with the threaded holes on the chassis.
Step 3 Tighten the captive screws only enough to secure the connector. Do not apply much torque. Do not use a power screw driver.
Step 4 Insert the D-connector without the frame in J1 on the power assembly
Step 5 Tighten the captive screws only enough to secure the connector. Do not use a power screw driver.
If you left the AC power supplies in the tray during installation, proceed to the next section, "Connecting AC Power to the Switch." To re-install power supplies you have removed:
Step 1 Push each power supply into the tray. When it almost reaches the end of the slot in the tray, a slight resistance is encountered. Push the power supply slightly farther in to achieve the final position and full connector mating.
Step 2 At the front of each supply, secure the supply to the tray by tightening the captive screw at the bottom/front of the supply.
For slots without a power supply, the hinged door on the tray should have a removable, blank panel.
Step 3 Close the hinged door and secure it with the screw at the top-center of the door.
If you removed the AC power supplies before installing the AC power tray, re-install them in the same locations they had when the switch arrived. If necessary, use the steps in the section titled "Installing AC Power Supplies." At the switch, the AC power receptacle is an IEC-type with a clamp.
To install the power cord:
Step 1 Loosen the cable clamp around the receptacle, otherwise the plug may not properly fit.
Step 2 Firmly seat the plug. This may require you to hold the chassis with one hand while you push the plug in with the other hand.
Step 3 Tighten the clamp.
Use the information in Figure 4-7, ""System Specifications," and the lug diagram in Figure 4-18 to connect the DC wiring.
This section describes how to install the front and back cards. Service modules can go in anywhere except reserved slots 7, 8, 15, 16, 23, 24, 31, and 32. The double-height and single-height PXMs and SRMs occupy these reserved slots. Additionally, upper slots 9 and 10 and lower slots 25 and 26 do not have a special bus for the bulk distribution feature. For this reason, Cisco recommends that if the switch contains RPMs, the first two RPMs go in slots 9 and 10.
| 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 switch before you touch any cards. |
 | Caution Handle the PXM front card very carefully to preserve the alignment of the attached disk drive. Do not drop or bump the PXM. |
| 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 PXM back card slot (7, 8, 23, or 24), damage to the card and backplane can result. If you accidentally try to insert a service module back card into slots 7, 8, 23, or 24 then observe incorrect switch operation, check for bent or damaged pins on the backplane and the back card. |
Verify the accuracy of the intended slot for each card before you begin installing the cards.
To install a front card:
Step 1 Position the rear card guides over the appropriate slot at the top and bottom of the card cage.
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.
Verify the accuracy of the intended slot for each card before you begin installing the cards:
| Caution Before using the switch, verify that the daughter card type on the PXM corresponds to the uplink card type. Serious damage may result if the power is on and these cards are mismatched. |
Step 1 Make sure the two extractor levers are in the "in" position. As you are move the card, the levers should be flush with the vertical edge of the back card.
Step 2 Gently slide the card all the way into the slot.
Step 3 Push the card into the connector.
Step 4 Tighten the two captive screws on the card faceplate only enough to secure the card.
Service modules can have either 1:1 redundancy or 1:N redundancy. For information on installation requirements, refer to the section titled "Service Resource Module" in this chapter. For configuration steps, see the section for the SRM in "Card and Service Configuration." For instructions on how to use the CiscoView application to configure redundancy, refer to the CiscoView user-documentation.
For 1:1 redundancy, a Y-cable is necessary. For 1:1 redundancy, place the card sets in adjacent slots and connect the Y-cable to the paired ports on the active and standby cards. Applicable service modules are:
For 1:N redundancy, an MGX Service Resource Module-3T3 (MGX-SRM-3T3/B) card set is necessary. It supports 1:N redundancy for the following:
With 1:N redundancy, a group of service modules has one standby module. Redundancy by way of the redundancy bus on the MGX-SRM-3T3/B requires the redundant card group have one of the following special back cards for redundancy support:
This section describes any unique requirements for installing the Processor Switching Module (PXM) card set and briefly describes the features of each card in the PXM card set. The PXM card set consists of the PXM front card, the PXM User Interface back card (PXM-UI), and the various uplink back cards that serve as either a trunk or a UNI. Each description includes a faceplate description and a list of applicable cables. For instructions on how to configure the PXM functionality for switch-level and network control, see "Configuring the MGX 8850 Switch." For lists of the physical details of PXM cards, standards compliances, and other details, see "System Specifications."
| Caution Handle the PXM front card very carefully to preserve the alignment of the attached disk drive. Do not drop or bump the PXM. |
| Caution Before using the switch, verify that the daughter card type on the PXM corresponds to the uplink card type. Serious damage may result if the power is on and these cards are mismatched. |
Primarily, the PXM controls the switch and provides 1.2 Gbps of non-blocking, shared memory switching. In addition, the PXM features are:
For descriptions of switch configuration tasks, see "Configuring the MGX 8850 Switch." For descriptions of how to modify partitioning, specify APS, and add UNI-port connections, see "Card and Service Configuration."
PXM Front Card
The PXM User Interface card (PXM-UI) connects the switch to the various ports that allow you to communicate with and control the switch. Install in the upper half of the back of the PXM. See Figure 4-20 for the connectors on the PXM-UI. 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 back card. For a T1 clock input, connect the source to the RJ 45 connector labeled "T1 Clock." For a E1 clock input, use the SMC connector marked "E1 Clock." See "Configuring the MGX 8850 Switch," for this switch-level feature.
Dry contact relay closures are available for forwarding MGX 8850 alarms to an alarm system. Separate visual and audible alarm outputs are available for major and minor alarm outputs. The MGX 8850 alarm outputs are available from a DB15 connector on the PXM-UI back card faceplate. Refer to "Cabling Summary," for the pinouts on this connector. Use switchboard cable for running these connections.
An illustration of the long-reach OC-12 card appears in Figure 4-21. For specifications on this card, refer to "System Specifications." Note that Automatic Protection Switching (APS) requires the "B" model---an SMFLR-1-622/B.
The intermediate reach OC-12 back card appears in Figure 4-22. For specifications on this card, refer to "System Specifications." Note that Automatic Protection Switching (APS) requires the "B" model---an SMFIR-1-622/B.
The SMF-155 back card provides a physical single-mode fiber optic SONET OC-3 interface that conforms to ANSI T1.105 and GR-253-CORE standards. This interface uses SC connectors, and redundant configurations are supported through Y-cables. See Figure 4-23 for an illustration of the OC-3 back card. For specifications on this card, refer to "System Specifications." Note that Automatic Protection Switching (APS) requires the "B" model---an SMF-155/B.
An illustration of the two-port T3 back card appears in Figure 4-24. For specifications on this card, refer to "System Specifications."
Two versions of the BNC-2E3 card are available. The BNC-2E3A applies to Australia only, and the BNC-2E3 applies to all other sites that require E3 lines on the PXM uplink card. An illustration of the two-port E3 back card appears in Figure 4-25. For specifications on this card, refer to "System Specifications."
The MGX-AUSM/B-8T1 and MGX-AUSM/B-8E1 (or simply "AUSM/B" as a generic reference to both card sets) are multipurpose front cards that use an eight-port T1 or E1 back card. The AUSM/B supports the following applications:
1. ATM Inverse Multiplexing N x T1 and N x E1 trunking
This application supports inverse multiplexed trunks between MGX 8850 switches. In turn, this supports inverse multiplexed trunks between BPX 8600-series network nodes via MGX 8850 switches and remote MGX 8850 switches.
2. ATM UNI card with eight ports to provide a high port density service module
With all 24 available slots installed with the AUSM/B cards, a single MGX 8850 switch could support up to 192 individual T1 or E1 lines.
In UNI/NNI mode each card can support 1000 data connections and 16 management connections.
3. UNI/NNI access to CPE and other networks
This application allows access over an UNI to IMA-based CPE and over an NNI to another ATM network.
4. NNI/NNI access to CPEs
This application supports ATM ports over single T1 or E1 line and IMA ports over multiple lines (connected to IMA-based CPE).
The following back cards are compatible with the AUSM/B:
The AUSM/B has the following features:
The AUSM/B front card oversees all major functions of the ATM interface. It contains firmware for both the T1 and the E1 line interfaces and downloads from the PXM the appropriate code when it recognizes the back card type. An illustration of an eight-port AUSM/B front card appears in Figure 4-26. For specifications on this card, refer to "System Specifications."
Descriptions of the LED indicators on the faceplate of the AUSM/B appear in Table 4-1.
| Type of LED | Color | Description |
|---|---|---|
PORT LED | Green | Green indicates the port is active. |
| Red | Red indicates a local alarm on the port. |
| Yellow | Yellow indicates a remote alarm on the port. |
|
| Off indicates the port has not been activated (upped). |
ACTIVE LED | Green | On indicates the card set is in active mode. |
STANDBY LED | Yellow | Slow blink with Active LED off means the card is in the boot state. |
|
| Fast blink with Standby LED on means card is receiving firmware. |
|
| Fast blink indicates the service module is passing BRAM channel information to the PXM. |
|
| Steady yellow indicates the card is in Standby mode and the firmware is executing ADMIN code. |
FAIL LED | Red | Steady Red with Active and Standby LEDs off indicates either the card is in the Reset condition, the card has failed, or the card set is not complete (no line module). |
|
| Steady Red with Active LED on indicates the card was active prior to failing. |
|
| Steady Red with Standby LED on indicates the card was standby prior to failing. |
The MGX-AUSM/B-8T1 and MGX-AUSM/B-8E1 use the generic eight-port T1 or E1 line modules that operate with the eight-port service modules. The standard T1 version of the back card has eight RJ-48 connectors. The standard versions of the E1 back card have either eight RJ-48 connectors or eight pairs of SMB connectors. To support 1:N redundancy through an MGX-SRM-3T3/B card set, special versions of the RJ-45 back card must exist in the system
Redundancy support for the AUSM/B requires an MGX-SRM-3T3/B card set and the special versions of the RJ-45 back cards that support redundancy. See Figure 4-27 and Figure 4-28 for illustrations of the back cards. Differences exist in certain aspects redundancy support for the MGX-AUSM/B-8T1 and MGX-AUSM/B-8E1. For details on the requirements for redundancy through an MGX-SRM-3T3/B, refer to the section in this chapter titled "Service Resource Module."
This section describes installation requirements that are particular to the various types of Frame Service Modules (FRSMs). For hardware and other specifications on the FRSMs, refer to "System Specifications." For descriptions of how to configure the card, lines, and ports and add Frame Relay connections, refer to "Card and Service Configuration." The supported FRSM front cards and related back cards are:
An FRSM can reside in any slot except 7, 8, 15, 16, 31, and 32. In addition, any card for which you specify 1:N redundancy through the redundancy bus and the MGX-SRM-3T3/B cannot go in slot 9, 10, 25, or 26. Whenever possible, the FRSM-VHS cards should go in the upper bay of the card cage because the upper half of the backplane provides higher bandwidth per slot.
FRSM-VHS supports Frame Relay services on a T3, E3, or HSSI interface. (The collective name for the MGX-FRSM-2CT3, MGX-FRSM-2T3, MGX-FRSM-2E3, and MGX-FRSM-HS2/B is Very High Speed Frame Service Modules---FRSM-VHS for short). The distinction between the front cards is the firmware operation. The FRSM-VHS group consists of:
Example illustrations of the FRSM-VHS front and back cards appear in the figures that follow.
The MGX-FRSM-HS1/B supports four V.35 ports. Each port can operate in DTE or DCE mode, and a DTE port has two available clock sources. You can change the line parameters from the defaults after you activate the line. Refer to "Card and Service Configuration" for a description card, line, and port configuration. Note that the MGX-FRSM-HS1/B does not support redundancy, so card locations are unaffected by this feature. An illustration of the MGX-FRSM-HS1/B front card appears in Figure 4-35. The multifunction 12IN1-S4 back card appears in Figure 4-36.
For the MGX-FRSM-HS1/B, the choice of cabling establishes the mode as DCE or DTE. The model number of this cabling is 12IN1. With a DTE type of 12IN1 cable, you can also specify the clock source as either line or ST (a pin in the DTE cable). With a DCE type of 12IN1 cable, the clock source is the MGX-FRSM-HS1/B. See Table 4-2 for the relationship between cabling and modes.
| Mode | Type of Cable | Clock Source | Mode of Remote End |
|---|---|---|---|
DTE | DTE | line | DCE |
DCE | DCE | internal | DTE |
DTE_ST | DTE | ST line | DCE |
The eight-port FRSMs support channelized or unchannelized service on either T1 or E1 lines.
Figure 4-37 (applies to both MGX-FRSM-8T1 and MGX-FRSM-8E1), and Figure 4-38 and Figure 4-39 (primary and redundant back cards for T1 and E1).
FRSMs can have either 1:1 redundancy or 1:N redundancy. For 1:1 redundancy, a Y-cable is necessary. The very high speed MGX-FRSM-2CT3, MGX-FRSM-2T3E3, and MGX-FRSM-HS2/B use Y-cable redundancy. For 1:N redundancy, an MGX-SRM-3T3/B and no Y-cabling are required. Differences may exist in the way the MGX-SRM-3T3/B supports redundancy for a particular T1 or E1 configuration. Refer to the section titled "Service Resource Module" in this chapter and the Service Resource Module description in "Card and Service Configuration."
For 1:1 redundancy, place the card sets in adjacent slots and connect a Y-cable for each pair of active and standby ports. On the CLI, configure the card for redundancy by executing the addred command. For instructions on how to use the CiscoView application to configure redundancy, refer to the CiscoView user-documentation.
1:N redundancy for the eight-port FRSMs requires an MGX-SRM-3T3/B. With 1:N redundancy, a group of service modules has one standby module. For information on installation requirements, refer to the "Service Resource Module" section in this chapter as well as the section on the MGX-SRM-3T3/B in "Card and Service Configuration."
The eight-port models (MGX-CESM-8T1and MGX-CESM-8E1) let you configure individual physical ports for structured or unstructured data transfer. The MGX-CESM-8T1 and MGX-CESM-8E1 card sets consist of the eight-port CESM front card and one of the following back cards:
Redundancy for the MGX-CESM-8T1 and MGX-CESM-8E1 is available through the MGX-SRM/B-3T3. The support is 1:N and requires that the supported group of service modules have one redundant card set. The redundant card set must have the special R-RJ45 version of the back card. For information on installation requirements, refer to the "Service Resource Module" section. For configuration requirements, see the section on the SRM in "Card and Service Configuration." For instructions on how to use the CiscoView application to configure redundancy, refer to the CiscoView user-documentation.
The description of the LEDs on the eight-port CESM front card appear in Table 4-3.
| Type of LED | Color | Meaning |
|---|---|---|
PORT LED | Green | Green indicates the port is active. |
| Red | Red indicates there is local alarm on the port. |
|
| Off indicates the port has not been activated (upped). |
ACTIVE LED | Green | On indicates the card set is in active mode. |
STANDBY LED | Yellow | Slow blink without the Active LED indicates the card is in the boot state. |
|
| Fast blink with the Standby LED indicates the card is being downloaded. |
|
| Fast blink indicates the service module is passing BRAM channel information to the PXM |
|
| Steady yellow indicates the card is in Standby mode and the firmware is executing ADMIN code. |
FAIL LED | Red | Steady Red with Active and Standby LEDs off indicates either the card is in the Reset condition, the card has failed, or the card set is not complete (no line module). |
|
| Steady Red with Active LED on indicates the card was active prior to failing. |
|
| Steady Red with Standby LED on indicates the card was standby prior to failing. |
|
| Both standby and red LED lit indicates self test failure. |
This section describes how installing a Service Resource Module-3T3 (MGX-SRM-3T3/B) can impact the installation of the service modules it supports. The MGX-SRM-3T3/B (or "SRM" for brevity) can provide 1:N redundancy for the T1 and E1 cards and bulk distribution for T1 cards. It has no communication with higher speed service modules, such as the MGX-FRSM-2CT3 and MGX-FRSM-HS2/B. See Figure 4-43 for an illustration of the card set.
The multifunction SRM has the following capabilities:
The following are card-level characteristics that apply to any SRM installation:
The use of bulk distribution affects the requirements for SRM and service module back cards:
For bulk distribution, the T3 lines connect to an external multiplexer. The T1 lines on the other side of the multiplexer connect to the CPE. The SRM converts the received traffic from its T3 lines to T1 channels and sends the data to linked service modules. For instructions on linking T1 channels and card slots to the MGX-SRM-3T3/B, see "Card and Service Configuration."
For bulk distribution of T1 lines, note the following about the MGX-SRM-3T3/B:
Copper-based data cables from the back cards go up or down to the cable manager and pass through the channels then run to either the left or right side of the rack. Fiber optic cables pass over the sheet metal portion. The cables subsequently go to the related equipment (CPE, for example). The view in Figure 4-44 shows only the cable manager on top.
Before applying power to the MGX 8850 switch, check the following items:
1. Switch 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. Check the following:
1. At the front of the unit, the status light on the PXM 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 should be on.
4. After each service module comes up, the status LEDs on each should show that it is in standby.
5. When power is turned on, make a visual check to verify that all fans are running.
The wiring on the Cisco MGX 8850 backplane requires you to consider the conversion sequence and other details when you convert single-height slots to double-height slots. One slot conversion means that you convert four single-height slots to two double-height slots. Be aware of the following before you convert the slots:
With a factory-installed Cisco MGX 8850 node, the single and double-height cards reside in the preassigned locations. Refer to Figure 4-45 for an illustration of an enclosure that shows installed cards and center guide modules. Certain slots have a small, L-shaped bracket holding in the card. All instances of this bracket are the card slots immediately to the right of a enclosure wall (or bulkhead). The system has three such brackets.
Each center guide module is secured by either a vertical support bracket or the simpler support bracket. Most center guide modules rely on the vertical support bracket. Three locations use the small support bracket: at the left wall of the card cage and at the bulkhead to the right of slot 8 and slot 14. For an illustration of a center guide module with support bracket, see Figure 4-47. For an illustration of a center guide module with vertical support bracket, see Figure 4-46.
| Warning Use extreme caution when executing these steps with system power turned on. |
To convert four single-height slots to two double-height slots in an operational system:
Step 1 Remove the cabling from the back card unless it is the correct back card for the double-height card.
Step 2 Remove the back card.
Step 3 Remove the front card.
Step 4 Repeat steps 2 and 3 for every other single-height module you remove.
Step 5 Rotate the screw that holds in the vertical center guide module.
Where either the left wall of the card cage or a bulkhead exists on the left of the single-height card slots, a simple, L-shaped bracket holds in the center guide module.
Step 6 If the center guide module has either type of wall to the left, unscrew the track attached to the wall. If necessary, remove cards to unscrew it.
Step 7 Remove the vertical support bracket by moving it up and down until you can take it out. A hole becomes visible in the center guide module for inserting a screw driver.
Step 8 Insert a screw driver and loosen the long screw that holds in the center guide module.
Step 9 Remove the center guide module.
Step 10 Install the double-height front card and back cards as needed.
A simpler situation exists when you install a new MGX 8850 switch in a non-Cisco rack or an existing Cisco cabinet: just unscrew the center guide module and remove it. Install a blank faceplate where you do not fill a double-height slot with a double-height card unless the enclosure has the optional front door.
Posted: Wed Jul 21 17:03:17 PDT 1999
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