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Table Of Contents
Physical and Functional Description
Multigigabit Crossbar Switch Fabric
Nonredundant and Redundant System Configurations
Switch Fabric Switching Capacity and Router Type
Environmental Monitoring and Alarms
Clock and Scheduler Card and Switch Fabric Card Status
Product Overview
This chapter provides an overview of the Cisco 12006 and Cisco 12406 series routers. It contains physical descriptions of the router hardware and major components, and functional descriptions of the hardware-related features.
Introduction
The routers described in this guide are part of the Cisco 12006 and Cisco 12406 series routers and include:
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The original Cisco 12006 and Cisco 12406 series routers.
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Note
These two router models are differentiated by the switching capacity of the switch fabric installed in the router:
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Other than their various capacities, these routers are almost identical. Differences between each router are described unless otherwise noted, all information in this publication applies to all routers.
Product Description
The Cisco 12006 and Cisco 12406 routers, shown in Figure 1-1, are members of the Cisco 12000 series router family. These routers are aimed at scaling the Internet and enterprise backbones to speeds of 155 Mbps (OC-3/STM-1), 622 Mbps (OC-12/STM-4), 2.4 Gbps (OC-48/STM-16), and 10 Gbps (OC-192/STM).
Figure 1-1 Cisco 12006 and Cisco 12406 router (Front View)
Line card slots (five)
Alarm card slots (two)
RP slot
Power module bays (two)
Blower module
CSC slots (two)
SFC slots (three)
Cable-management bracket
With a chassis height of 18.5 inches (46.9 cm), four Cisco 12006 and Cisco 12406 routers can be installed in a single standard 7-foot (2.15-m) equipment rack.
Cisco 12006 and Cisco 12406 routers support system software downloads for most Cisco IOS software upgrades, which enables you to remotely download, store, and boot from a new Cisco IOS image.
Cisco 12006 and Cisco 12406 routers have the following key features:
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Figure 1-2 Cisco 12006 and Cisco 12406 router (Rear View)
Blower module
Air exhaust vents
Blower module LEDs
PDU (behind Blower module; AC PDU shown)
Blower module handle
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Physical and Functional Description
The main physical components of Cisco 12006 and Cisco 12406 routers and their functions are described in the following sections:
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Chassis
The Cisco 12006 and Cisco 12406 router chassis is an enclosure that consists of two integral card cages and two power module bays. (see Figure 1-1.)
RP and Line Card Slots
The RP and line card cage has six user-configurable slots that support one RP and up to five line cards. Network interfaces reside on the line cards that connect the switch fabric of the router to the external networks. For more information about the role of the RP, see the "Route Processors" section. For more information about the role of the line cards, see the "Line Cards" section.
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Switch Fabric Card Slots
The switch fabric circuitry resides in five fabric card slots: two for CSCs and three for SFCs. (See Figure 1-1.) For more information about the role of the switch fabric circuitry, see the "Multigigabit Crossbar Switch Fabric" section.
Alarm Card Slots
Cisco 12006 and Cisco 12406 routers are equipped with two alarm cards. These cards are positioned beside one another and occupy two card slots directly under the CSC slots. (See Figure 1-1.) For more information about the role of the alarm cards, see the "Alarm Cards" section.
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Chassis Backplane
All of the card cages are tied together electrically through a passive system backplane in the back of the chassis. Nearly all of the wiring and circuitry in the chassis is contained within or connected to the chassis backplane. The chassis backplane distributes DC power to all of the cards in the chassis as well as the blower module, and provides the physical communication pathway between cards, both for network data and system communication across the internal system maintenance bus (MBus).
Power
Because a Cisco 12006 or Cisco 12406 Router can be configured with either an AC-input power system or a DC-input power system, the power module bays will accept either AC-input power supply modules or DC-input PEMs. For more information about the power subsystems, see the "Power Subsystems" section.
Caution
Cooling
Cisco 12006 and Cisco 12406 routers are equipped with a blower module to distribute air within the chassis. The blower module is a removable module located on the rear of the chassis. (See Figure 1-2.) For more information about the blower module, see the "Blower Module" section.
Multigigabit Crossbar Switch Fabric
Cisco 12006 and Cisco 12406 router switch fabric circuity provides synchronized gigabit-speed interconnections for the line cards and the RP. The switch fabric circuitry resides in five fabric card slots: two for CSCs; three for SFCs. (See Figure 1-3.)
Figure 1-3 Clock and Scheduler and Switch Fabric Card Bays
Switch Fabric Card Types
The CSCs are installed in the half-width slots labeled CSC 0 and CSC 1 on the lower left side of the chassis, located directly beneath the RP and line card cage and directly above the alarm card bays. The three SFCs are installed in the half-width slots labeled SFC 0, SFC 1, and SFC 2 on the lower right side of the chassis.
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The CSC contains the following functionality:
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The SFC contains only the switch fabric circuitry, which carries user traffic between line cards or between the RP and the line cards. The SFC receives scheduling information and the system clock sent from the CSC.
Nonredundant and Redundant System Configurations
Cisco 12006 and Cisco 12406 routers are available in two system configurations:
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When you order a Cisco 12006 or Cisco 12406 Router, the nonredundant configuration is shipped by default.
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For the redundant configuration, EMI compliance and cooling requirements are met by having two CSCs and two power supplies installed in the system.
For the nonredundant configuration, EMI compliance and cooling requirements are met only when blank fillers are installed in place of either (or both) the second (unused) CSC slot or the second (unused) power supply bay.
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Switch Fabric Switching Capacity and Router Type
The Cisco 12006 Router is based on a 2.5-Gbps switch fabric, where each CSC or SFC provides a 2.5-Gbps full-duplex connection to each line card in the system. The 2.5-Gbps switch fabric consists of the 12006 Advanced Clock and Scheduler Card (product number 12006-CSC=) and the 12006 Advanced Switch Fabric Card (product number 12006-SFC=). The 2.5-Gbps switch fabric for the Cisco 12006 Router can be identified by the Cisco identification labels on the switch fabric cards (SFCs and CSCs): The CSC is labeled CSC-30/120 and the SFC is labeled SFC-30/120.
The Cisco 12406 Router is based on a 10-Gbps switch fabric, where each CSC or SFC provides a 10-Gbps full-duplex connection to each line card in the system. The 10-Gbps switch fabric consists of the Clock and Scheduler Card (product number GSR6-CSC=) and the Switch Fabric Card (product number GSR6-SFC=). The 10-Gbps switch fabric cards are labeled simply CSC and SFC.
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Switch Fabric Redundancy
Equipping the router with two CSCs provides data path, scheduler, and reference clock redundancy. The interfaces between the line cards and the switch fabric are monitored constantly. If the router detects a loss of synchronization (LOS), it automatically activates the data paths of the redundant CSC, and data flows across the redundant path. The switch to the redundant CSC occurs within 0.5 second, with little or no loss of data.
Maintenance Bus
The Cisco 12006 and Cisco 12406 router maintenance bus and MBus modules manage the maintenance functions of the system. The MBus is integrated into the backplane and consists of two separate buses, providing MBus redundancy.
Both MBus networks are linked to all the following items:
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The MBus module located on each component communicates over the MBus and is powered by DC voltage directly from the alarm card. The MBus performs the functions of power-up/down control for each component, component (device) discovery, code download, diagnostics, and environmental monitoring and alarms.
Power-Up/Down Control
Each MBus module directly controls the DC-DC converters on the component on which it is mounted, based on commands the component receives from its on-board EPROM and from the RP. Each MBus module is tied directly to DC voltage from the alarm card.
When power is applied to the router, all MBus modules immediately power up. The MBus modules on the RP and CSC immediately turn on the DC-DC converter, powering up the respective card. The line card MBus module waits to power up the line card until it receives a command from the RP.
Device Discovery
The RP uses the MBus to detect the system configuration. The RP sends a message over the MBus requesting identity information from all installed devices. The responses provide component type, as well as slot numbers for the line cards, CSCs, SFCs, and alarm cards.
Code Download
A portion of the line card operating software can be downloaded from the RP to the line card over the MBus. Because the MBus is relatively slow compared to the switch fabric, only enough code is downloaded to the line card for it to access the switch fabric and complete the download process.
Diagnostics
The diagnostic software image is downloaded from the RP to the line card during the test sequence.
Environmental Monitoring and Alarms
The MBus module on each component monitors the environment of that component as follows:
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Route Processors
Each Cisco 12006 and Cisco 12406 router has one main system (or route) processor. The route processor (RP) processes the network routing protocols and distributes updates to the Cisco Express Forwarding (CEF) tables on the line cards. The RP also performs general maintenance functions, such as diagnostics, console support, and line card monitoring.
Route Processor Functions
The RP performs the following are primary functions:
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The RP will function in any slot in the line card/RP card cage, but slot 5 is the recommended slot. If the router is equipped with an optional, redundant route processor, it can be installed in any of the remaining five slots.
The RP communicates with the line cards either through the switch fabric or through the MBus. The switch fabric connection is the main data path for routing table distribution as well as for packets that are sent between the line cards and the RP. The MBus connection allows the RP to download a system bootstrap image, collect or load diagnostic information, and perform general, internal system maintenance operations.
Route Processor Types
Two types of RPs are available for Cisco 12006 and Cisco 12406 routers, the Gigabit Route Processor (GRP), and the Performance Route Processor (PRP).
Each of these route processor types is reviewed in the following sections:
When not explicitly specified, this document uses the term route processor (RP) to indicate either the GRP or the PRP.
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Gigabit Route Processor
This section provides information about the GRP. The GRP front view is shown in Figure 1-4.
Figure 1-4 Gigabit Route Processor (Front View)
The GRP card has the following components:
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The GRP is shipped with 20 MB of Flash memory as the default configuration.
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The Cisco IOS software images for operating the router reside in Flash memory on the GRP. The Flash memory can be either the single in-line memory module (SIMM) on the GRP or a PCMCIA Flash memory card that inserts into either PCMCIA slot 0 or slot 1 (labeled SLOT-0 and SLOT-1) on the front of the GRP. (See Figure 1-5.)
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Storing the Cisco IOS images in Flash memory enables you to download and boot from upgraded Cisco IOS images remotely or from software images resident in GRP Flash memory. The Cisco IOS software runs from within GRP DRAM.
Figure 1-5 GRP Layout
GRP Memory Components
Table 1-1 lists the memory components on the GRP. Figure 1-5 shows the location of the DRAM and Flash SIMM on the GRP.
Table 1-1 GRP Memory Components
DRAM
1281 or 256 MB
1 or 2
64-MB or 128-MB DIMMs (based on DRAM required) for main Cisco IOS software functions
U39 (bank 1)
U42 (bank 2)SRAM
512 KB (fixed)2
Secondary CPU cache memory functions
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NVRAM
512 KB (fixed)2
System configuration files, register settings, and logs
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Flash Memory
8 MB SIMM3
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Cisco IOS software images and other user-defined files
U17
20 MB4 Flash memory card
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Cisco IOS software images, system configuration files, and other user-defined files on up to two Flash memory cars5
Flash memory card
slot 0 and
slot 1Flash boot ROM
512 KB
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Flash EPROM for the ROM monitor program boot image
1 128 MB of DRAM is the default DRAM configuration for the GRP.
2 This memory is neither user configurable nor field upgradeable.
3 SIMM socket is wired according to a Cisco design and does not accept industry-standard, 80-pin Flash SIMMs.
4 20-MB Flash memory card is the default shipping configuration.
5 Type I or Type II PCMCIA cards can be used in either PCMCIA slot.
DRAM
The EDO DRAM on the GRP stores routing tables, protocols, and network accounting applications, and runs the Cisco IOS software. The standard (default) GRP DRAM configuration is 64 MB of EDO DRAM, which you can upgrade to 256 MB. Table 1-2 lists the DRAM configurations and upgrades.
Table 1-2 GRP DRAM Configurations
128 MB1
MEM-GRP/LC-64(=)
U39 (bank 1) and U42 (bank 2)
2 64-MB DIMMs
128 MB
MEM-GRP/LC-128(=)
U39 (bank 1)
1 128-MB DIMM
256 MB
MEM-GRP/LC-256(=)
U39 (bank 1) and U42 (bank 2)
2 128-MB DIMMs
1 128 MB is the standard (default) DRAM configuration for the GRP.
Caution
SRAM
SRAM provides secondary CPU cache memory. The standard GRP configuration is 512 KB. Its principal function is to act as a staging area for routing table updates and for information sent to and received from line cards. SRAM is not user configurable and cannot be upgraded in the field.
NVRAM
NVRAM provides 512 KB of memory for system configuration files, software register settings, and environmental monitoring logs. This information is backed up with built-in lithium batteries that retain the contents for a minimum of five years. NVRAM is not user configurable and cannot be upgraded in the field.
Flash Memory
Flash memory allows you to remotely load and store multiple Cisco IOS software and microcode images. You can download a new image over the network or from a local server and then add the new image to Flash memory or replace the existing files. You then can boot the routers either manually or automatically from any of the stored images.
Flash memory also functions as a Trivial File Transfer Protocol (TFTP) server to allow other servers to boot remotely from stored images or to copy them into their own Flash memory. The onboard Flash memory (called bootflash) contains the Cisco IOS boot image, and the Flash memory card contains the Cisco IOS software image. To order a spare Flash memory card, use Cisco product number MEM-GRP-FL20=, which is a 20-MB Type II PCMCIA Flash memory card.
System Status LEDs
The GRP faceplate contains two types of system status LEDs: alphanumeric LED displays and device or port activity indicators.
The device or port activity indicators (see Figure 1-6) consist of the following functional groups:
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Figure 1-6 GRP LEDs (Partial Front Panel)
The alphanumeric LED displays (see Figure 1-7) are organized as two rows of four characters each. The content of the displays is controlled by the MBus module software. Both rows of the display are powered by the MBus module.
Figure 1-7 GRP Alphanumeric LED Displays (Partial Faceplate)
The alphanumeric LED displays router status messages:
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During the boot process, the alphanumeric LED message displays are controlled directly by the MBus module. After the boot process, they are controlled by the Cisco IOS software (through the MBus) and display messages designated by the Cisco IOS software.
The alphanumeric LED message displays also provide information about different levels of system operation, including the following:
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Soft Reset Switch
The soft reset switch (see Figure 1-6) causes a nonmaskable interrupt (NMI) and places the GRP in ROM monitor mode. When the GRP enters ROM monitor mode, its behavior depends on the setting of the GRP software configuration register. (For more information on the software configuration register, see the "Configuring the Software Configuration Register" section on page 4-1.)
For example, when the boot field of the software configuration register is set to 0x0 and you press the NMI switch, the GRP remains at the ROM monitor prompt (rommon>) and waits for a user command to boot the system manually. If the boot field is set to 0x1, the system automatically boots the first Cisco IOS image found in the onboard Flash memory SIMM on the GRP.
Caution
Access to the soft reset switch is through a small opening in the GRP faceplate. To press the switch, you must insert a paper clip or similar small pointed object into the opening.
PCMCIA Slots
The GRP has two PCMCIA slots. Either slot can support a Flash memory card or an input/output (I/O) device, as long as the device requires only +5.2 VDC. The GRP supports only Type I and Type II devices. It does not support +3.3 VDC PCMCIA devices. Each PCMCIA slot has a button to eject the PCMCIA card from the slot.
Table 1-3 PCMCIA Devices (with GRP Oriented Horizontally)
Type I or II
Empty
Empty
Type I or II
Type I or II
Type I or II
Asynchronous Serial Ports
The console and auxiliary ports on the GRP are asynchronous serial ports used to connect external devices to monitor and manage the system. (See Figure 1-4.)
The console port is an Electronics Industries Association/Telecommunications Industry Association (EIA/TIA)-232 receptacle (female) that provides a data circuit-terminating equipment (DCE) interface for connecting a console terminal.
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The auxiliary port is an EIA/TIA-232 plug (male) that provides a data terminal equipment (DTE) interface. The auxiliary port supports flow control and is often used to connect a modem, a channel service unit (CSU), or other optional equipment for Telnet management.
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Ethernet Port
The GRP has one Ethernet port (see Figure 1-4), which uses one of the following two port connection types:
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The speed is determined by the network to which the Ethernet interface is connected, and is not user-configurable. Moreover, even at the auto-sensed data transmission rate of 100 Mbps, the Ethernet port provides maximum usable bandwidth of less than 100 Mbps. Expect a maximum usable bandwidth of approximately 20 Mbps when using either the MII or RJ-45 connection.
Performance Route Processor
This section provides information about the PRP. The PRP is supported in both the Cisco 12406 Router and the Cisco 12006 Router. Figure 1-8 shows the front panel view of the PRP. The PRP is shipped with 20 MB of Flash memory as the default configuration.
Figure 1-8 Performance Route Processor (Front View)
The PRP is available as Product Number PRP-1=, which includes one PRP with 512 MB of SDRAM and one 64-MB ATA Flash disk. A redundant PRP (Product Number PRP-1/R=) is also available.
The PRP contains the following components:
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The Cisco IOS software images are stored in Flash memory. Two types of Flash memory ship with the PRP:
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Storing the Cisco IOS images in Flash memory enables you to download and boot from upgraded Cisco IOS software images remotely, or from software images that reside in PRP Flash memory.
Cisco 12000 Series Routers support downloadable system software for most Cisco IOS software upgrades. This enables you to remotely download, store, and boot from a new Cisco IOS software image. The Cisco IOS software runs from within the SDRAM of the PRP.
Figure 1-9 shows the locations of the various hardware components on the PRP.
Figure 1-9 PRP (Horizontal Orientation)
PRP Memory Components
PRP memory options and functions are listed in Table 1-4.
Table 1-4 PRP Memory Components
SDRAM1
512 MB,
1 GB, or 2 GB1 or 2
512-MB and 1-GB DIMMs (based on desired SDRAM configuration) for main Cisco IOS software functions
U15 (bank 1)2
U18 (bank 2)SRAM3
2 MB (fixed)
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Secondary CPU cache memory functions
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NVRAM3
2 MB (fixed)
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System configuration files, register settings, and logs
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Flash memory
64 MB SIMM4
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Cisco IOS boot image (bootflash), crash information, and other user-defined files
P3
64 MB, 128 MB, or 1 GB Flash disks5
1 or 2
Cisco IOS software images, system configuration files, and other user-defined files on up to two Flash disks
Flash disk
slot 0 and
slot 1Flash boot ROM
512 KB
1
Flash EPROM for the ROM monitor program boot image
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1 Default SDRAM configuration is 512 MB. Bank 1 (U15) must be populated first. You can use one or both banks to configure SDRAM combinations of 512 MB, 1 GB, or 2 GB. 1.5-GB configurations are not supported.
2 If both banks are populated, bank 1 and bank 2 must contain the same size DIMM.
3 This memory is neither user configurable nor field replaceable.
4 Flash memory SIMM is not user configurable or field replaceable.
5 ATA Flash disks and Type I and Type II linear Flash memory cards are supported. See the "Flash Memory" section for Flash disk information.
Note
SDRAM
SDRAM stores routing tables, protocols, and network accounting applications, and runs the Cisco IOS software. The default PRP configuration includes 512 MB of error checking and correction (ECC) SDRAM. DIMM upgrades of 512 MB and 1 GB are available. You cannot mix memory sizes. If two DIMMS are installed, they must be the same memory size.
Caution
SRAM
SRAM provides 2 MB of parity-protected, secondary CPU cache memory. It acts as a staging area for routing table updates and for information sent to and received from line cards. SRAM is not user configurable and cannot be upgraded in the field.
NVRAM
NVRAM provides 2 MB of memory for system configuration files, software configuration register settings, and environmental monitoring logs. This information is backed up with built-in lithium batteries that retain the contents for a minimum of 5 years. NVRAM is not user configurable and cannot be upgraded in the field.
Flash Memory
Flash memory allows you to remotely load and store multiple Cisco IOS software and microcode images. You can download a new image over the network or from a local server and then add the new image to Flash memory or replace the existing files. You then can boot the routers either manually or automatically from any of the stored images.
Flash memory also functions as a TFTP server to allow other servers to boot remotely from stored images or to copy them into their own Flash memory. The onboard Flash memory (called bootflash) contains the Cisco IOS boot image, and the Flash disk contains the Cisco IOS software image. A 64-MB ATA Flash disk ships by default with the PRP. Table 1-5 lists the supported Flash disk sizes and their Cisco product numbers.
Table 1-5 Supported Flash Disk Sizes and Product Numbers
64 MB2
MEM-12KRP-FD64=
128 MB
MEM-12KRP-FD128=
1 GB
MEM-12KRP-FD1G=
1 Standard Type 1 and Type 2 linear Flash memory cards also are supported, although they may not have the capacity to meet the requirements of your configuration.
2 64-MB ATA Flash disk is the default shipping configuration.
System Status LEDs
The PRP faceplate is equipped with two types of system status LEDs: device or port activity indicators and alphanumeric LED displays.
The device or port activity indicators consist of the following functional groups:
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The alphanumeric display LEDs are organized as two rows of four characters each and are located at one end of the card. (See Figure 1-7.) These LEDs display system status and error messages generated during and after the boot process. The boot process and the content displayed are controlled by the MBus module software on the PRP.
At the end of the boot process, the LEDs are controlled by the Cisco IOS software (via the MBus), and the content displayed is designated by the Cisco IOS software.
The display LEDs indicate the following information:
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Soft Reset Switch
The soft reset switch causes a nonmaskable interrupt (NMI) and places the PRP in ROM monitor mode. When the PRP enters ROM monitor mode, its behavior depends on the setting of the PRP software configuration register. (For more information on the software configuration register, see the "Configuring the Software Configuration Register" section on page 4-1. For example, when the boot field of the software configuration register is set to 0x0 and you press the NMI switch, the PRP remains at the ROM monitor prompt (
rommon>) and waits for a user command to boot the system manually. If the boot field is set to 0x1, the system automatically boots the first IOS image found in the onboard Flash memory SIMM on the PRP.
Caution
Access to the soft reset switch is through a small opening in the PRP faceplate. To press the switch, you must insert a paper clip or similar small pointed object into the opening.
Flash Disk Slots
The PRP includes two Flash disk (PCMCIA) slots. Either slot can support an ATA Flash disk or a Type 1 or Type 2 linear Flash memory card. The PRP ships by default with one 64-MB ATA Flash disk.
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The PRP supports different combinations of Flash devices. You can use ATA Flash disks, Type 1 or Type 2 linear Flash memory cards, or a combination of the two. Each Flash disk slot has an ejector button for ejecting a card from the slot.
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Ethernet Ports
The PRP has two 10/100 Mbps Ethernet ports, each using an 8-pin RJ-45 receptacle for either IEEE 802.3 10BASE-T (10 Mbps) or IEEE 802.3u 100BASE-TX (100 Mbps) connections. (See Figure 1-8.)
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Asynchronous Serial Ports
The PRP has two asynchronous serial ports, the console and auxiliary ports. (See Figure 1-8.) These ports allow you to connect external serial devices to monitor and manage the system. Both ports use RJ-45 receptacles.
The console port provides a data circuit-terminating equipment (DCE) interface for connecting a console terminal. The auxiliary port provides a data terminal equipment (DTE) interface and supports flow control. It is often used to connect a modem, a channel service unit (CSU), or other optional equipment for Telnet management.
Line Cards
Cisco 12006 and Cisco 12406 routers come pre-installed with the number and type of line cards that you ordered. Line cards and RPs can be installed in two basic combinations to support RP redundancy and a variety of physical network media:
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Line cards can be installed in any slot—zero (0) through five (5)—in the card cage. Slot number 5 is the recommended default RP slot. Single-mode and multimode line cards are shown in Figure 1-10.
Line cards provide the interfaces to the router's external physical media. External connections are made from the front of the chassis to the connectors on the line card face plates. The line cards communicate with the RP and exchange packet data with each other through the switch fabric cards in the switch fabric and alarm card cage.
Caution
A cable-management bracket attaches to the faceplate of each line card to manage and organize the network interface cables connected to the individual ports on the line card.
Line cards installed in the router support online insertion and removal (OIR), which means you can remove and replace a line card while the router remains powered up.
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Figure 1-10 Sample Line Cards
Alarm Cards
Cisco 12006 and Cisco 12406 routers have two alarm card slots. Each alarm card performs the following function or indicates the following condition:
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The entire alarm function has been implemented on redundant alarm cards with OIR maintenance (hot-swappable) functionality.
Figure 1-11 Alarm Card Features
MBus status LED
Major alarm LED
CSC status LEDs (two)
Minor alarm LED
SFC status LEDs (three)
Alarm relay contact connector
Critical alarm LED
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Alarm Output Function
The alarm output function consists of a group of relays, LEDs, and their associated drivers connected to an output port on the MBus module.
The alarm output function is controlled by the software on the RP. When a signal is received from the RP, the MBus module on the alarm card activates specific relays to signal an alarm condition. There are three alarm condition severity levels: critical, major, and minor. The critical, major, and minor LEDs are paired for redundancy to protect against a single failed LED.
Note
The IOS software running on the RP determines whether a given alarm condition is a critical, major, or minor alarm. Typing the show commands sh gsr table and sh env all will give you the table of limits and current readings for the LEDs.
Clock and Scheduler Card and Switch Fabric Card Status
The alarm card provides OK and FAIL indications for all clock and scheduler cards and switch fabric cards in the system. Redundant signals from the fabric cards are brought out to the LEDs on each alarm card. The alarm card does not control how these LEDs are used.
The MBus auxiliary power supply consists of a 50W DC-DC power supply and some current-sharing circuitry. Because the alarm card itself is powered by this supply, the on-board MBus module can report problems with the supply only when the redundant alarm card is in the chassis and providing MBus power.
Alarm Card Status
The ENABLED/FAIL pair of LEDs labeled MBUS indicate the status of the alarm card. The green ENABLED LED indicates that the MBus module on the alarm card is operating properly. The yellow FAIL LED indicates that the alarm card has detected an error in itself or with the MBus power supply.
Power Source Monitoring
The alarm card monitors the power modules and signals when there is a condition outside the normal range of operation. It discloses problems such as the following:
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Alarm Relay Contact Connector
The 9-pin D-type alarm relay contact connector on the faceplate of the alarm card (see Figure 1-11) is used to connect external alarm indication equipment to the router so that alarm indicator signals in the router can be repeated elsewhere outside the router.
The pins on this connector are tied directly to the critical, major, and minor alarm relay contacts (normally open, normally closed, and common). Any event that causes one of the alarm LEDs on the alarm card faceplate to go on also activates the corresponding relay contact closure. The relay interface is rated at a maximum of 2A, 60V, or 50VA, whichever is greater.
Because alarm contact cables are entirely dependent on site-specific circumstances, alarm connector cables are not available from Cisco. For information about alarm connector wiring requirements and the pinout for the alarm connector interface, see the "Alarm Card Alarm Relay Connector Specifications" section on page A-6.
Power Subsystems
Cisco 12006 and Cisco 12406 routers can be powered by either an AC or DC power subsystem, as described in the following sections:
Note
For detailed handling and replacement instructions for the Cisco 12006 and Cisco 12406 router power supplies or PEMs, see Chapter 6, "Maintaining the Router," or refer to the appropriate configuration note for the power supply or PEM that is shipped from the factory as an FRU.
Note
AC Power Subsystem
The AC power subsystem consists of the following system components:
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Caution
AC PDU
Facility AC power connects to AC-powered Cisco 12006 and Cisco 12406 routers though the AC PDU on the chassis rear panel. (See Figure 1-2 and Figure 1-12.)
Figure 1-12 AC Power Distribution Unit
Captive screw
AC power distribution unit
AC power cord receptacle A
Guide pin
AC power cord receptacle B
Blower module connector
Depending on whether the router is configured for nonredundant or redundant power operation, the router ships with either one or two 14-foot (4.3-m) AC power cords to connect the PDU to the facility AC power source. AC power cords with different source AC power plugs are available. (See Figure 2-3 on page 2-15.)
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AC-Input Power Supply
The AC-input power supply is a removable power module that installs in one of the bottom two bays on the front of the chassis (see Figure 1-1). These power modules support the OIR feature and are hot-swappable.
Figure 1-13 AC-Input Power Supply
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