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Appendix A provides the technical specifications for the Cisco 12406 Internet Router.
This appendix includes the following environmental specifications.
The following are the system level requirements for the Cisco 12406 Internet Router.
| 1Two PEMs are required for EMC compliance
2A narrow card filler panel must be used to ensure proper air flow through the chassis and electromagnetic compatibility (EMC) |
This section lists the Cisco 12406 Internet Router specifications. These specifications are listed in two tables. Table A-2 lists the physical specifications and Table A-3 lists the environmental specifications.
| 1g = Gravity
2oct/min = Octave per minute |
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Warning Exhaust from other equipment vented directly into the Cisco 12406 Internet Router air inlet may cause an over-heat condition. Install the Cisco 12406 Internet Router so that it is protected from a direct flow of hot air from other equipment. |
At sites where the Cisco 12406 Internet Router operates with AC-power distribution units, observe the following guidelines.
Different styles of AC-input power cords are shown in Figure A-1 .
Each Cisco 12406 GSR 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.
Two types of RPs are available for the Cisco 12406 GSR:
When not explicitly specified, this document uses the term route processor (RP) to indicate either the GRP or the PRP.
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Note If you install a second, redundant RP, it must be of the same type as the primary RP. |
This section provides an overview of the Gigabit Route Processor (GRP) and its use as the main system processor for the Cisco 12406 Internet Router.
This section provides information on the following GRP functionality.
If you have a PRP, see the "Performance Route Processor" section.
Figure A-2 shows the front panel view of the GRP.
The following are primary functions of the GRP.
The GRP communicates with the line cards either through the switch fabric or the through the maintenance bus (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 GRP.
The MBus connection allows the GRP to download a system bootstrap image, collect or load diagnostic information, and perform general, internal system maintenance operations. The GRP plugs into any slot in the card cage in the Cisco 12406 Internet Router. The Cisco 12406 Internet Router is shipped with 20MB of Flash memory as the default configuration.
Memory components of the GRP are listed in Table A-4.
| 164 MB of DRAM is the default DRAM configuration for the GRP.
2SRAM is not able to be upgraded or configured. 3NVRAM is not able to be upgraded or configured. 4SIMM socket is wired for Cisco's own design and does not accept industry-standard 80-pin Flash SIMMs. 520-MB Flash memory card is the default shipping configuration for the Cisco 12406 GSR. |
The Cisco IOS software images that run the Cisco 12406 Internet Router reside in Flash memory, which is located on the GRP in the form of a single in-line memory module (SIMM), and on up to two (PCMCIA) cards (called Flash memory cards) that insert in the two PCMCIA slots on the front of the GRP. 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 12406 Internet Router supports system software downloads for most Cisco IOS software upgrades, which enables you to remotely download, store, and boot from a new Cisco IOS image. See Figure A-2.
DRAM—The EDO DRAM on the GRP stores routing tables, protocols, and network accounting applications; it also runs the Cisco IOS software. The default GRP DRAM configuration is 64 megabytes of EDO DRAM, which you can increase up to 256 MB through DRAM upgrades. The Cisco IOS software runs from within GRP DRAM. Table A-5 lists the DRAM configurations and upgrades.
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Caution To prevent memory problems, DRAM DIMMs must be 3.3-volt, 60-nanosecond devices. Do not attempt to install other devices in the DIMM sockets. |
| Total DRAM | Product Numbers | DRAM Sockets | Number of DIMMs |
|---|---|---|---|
| 164 MB of DRAM is the default DRAM configuration for the GRP. |
SRAM—Provides secondary CPU cache memory. The standard GRP configuration is 512 KB. The principle function of SRAM is to act as a staging area for routing table update information to and from the line cards. SRAM is not able to be upgraded or configured.
NVRAM—The system configuration, software configuration register settings, and environmental monitoring logs are contained in the 512-KB NVRAM, which is backed up with built-in lithium batteries that retain the contents for a minimum of five years. NVRAM is not able to be upgraded or replaced in the field.
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Caution Before you replace the GRP in the system, back up the running configuration to a Trivial File Transfer Protocol (TFTP) file server or an installed Flash memory card so you can retrieve it later. |
If the configuration is not saved, the entire configuration will be lost inside the NVRAM on the removed GRP and you will have to reenter the entire configuration manually.
This procedure is not necessary if you are temporarily removing a GRP; lithium batteries retain the configuration in memory until you replace the GRP in the router.
Flash memory—Both the onboard and PCMCIA card-based Flash memory allow 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 can then 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.
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 VDC.
System status LEDs—This section describes the two types of system status light emitting diodes (LED) used on the GRP.
The following levels of system operation are displayed:
This section provides an overview of the Performance Route Processor (PRP) and its use as the main system processor for the Cisco 12406 Internet Router.
This section provides information on the following PRP functionality.
If you have a GRP, see the "Gigabit Route Processor" section.
Figure A-3 shows the front panel view of the GPP.
The following are primary functions of the PRP.
The PRP communicates with the line cards either through the switch fabric or the through the maintenance bus (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 PRP.
The MBus connection allows the PRP to download a system bootstrap image, collect or load diagnostic information, and perform general, internal system maintenance operations. The PRP plugs into any slot in the card cage in the Cisco 12406 Internet Router. The Cisco 12406 Internet Router is shipped with 20MB of Flash memory as the default configuration.
Memory components of the PRP are listed in Table A-6.
| 1Default SDROM 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 GV. 1.5-GB configurations are not supported.
2SRAM is not user configurable or field replaceable. 3NVRAM is not user configurable or field replaceable. 4Flash memory SIMM is not user configurable or field replaceable. 5ATA Flash disks, and Type 1 and Type II linear Flash memory cards are supported. |
The Cisco IOS software images that run the Cisco 12406 Internet Router reside in Flash memory, which is located on the PRP in the form of a single in-line memory module (SIMM), and on up to two (PCMCIA) cards (called Flash memory cards) that insert in the two PCMCIA slots on the front of the PRP. 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 PRP Flash memory.
The Cisco 12406 Internet Router supports system software downloads for most Cisco IOS software upgrades, which enables you to remotely download, store, and boot from a new Cisco IOS image. See Figure A-3.
SDRAM—The SDRAM on the PRP stores routing tables, protocols, and network accounting applications; it also 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.
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Caution Cisco strongly recommends that you use only Cisco-approved memory. To prevent memory problems, SDRAM DIMMs must be +3.3VDC, PC133-compliant devices. Do not attempt to install other devices in the DIMM sockets. |
SRAM—Provides 2 MB of parity-protected, secondary CPU cache memory. 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—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.
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Caution Before you replace the PRP in the system, back up the running configuration to a Trivial File Transfer Protocol (TFTP) file server or an installed Flash memory card so you can retrieve it later. |
If the configuration is not saved, the entire configuration will be lost inside the NVRAM on the removed PRP and you will have to reenter the entire configuration manually.
This procedure is not necessary if you are temporarily removing a PRP; lithium batteries retain the configuration in memory until you replace the PRP in the router.
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 disk contains the Cisco IOS software image. A 64-MB ATA Flash disk ships by default with the PRP. Table A-7 lists the supported Flash disk sizes and their Cisco product numbers.
| Flash Disk Size1 | Product Number |
|---|---|
| 1Standard 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.
264-MB ATA Flash disk is the default shipping configuration. |
This section describes the two types of system status light emitting diodes (LED) used on the PRP.
The alphanumeric display LEDs are organized as two rows of four characters each and are located at one end of the card. These LEDs provide system status and error messages that are displayed during and after the boot process. The boot process and the content displayed are controlled by the PRPs MBus module software.
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 following levels of system operation are displayed:
The PRP has two asynchronous serial ports, the console and auxiliary ports. These 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.
The PRP includes two Ethernet ports, both 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.
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Note The transmission speed of the Ethernet ports is auto-sensing by default and is user configurable. |
The Cisco 12406 Internet Router is shipped from the factory with up to 5 installed line cards that provide a variety of network media types (based on your order). The line cards are installed in slots 0 through 5 in the line card cage and interface to each other and to the RP through the switch fabric. Vertical cable-management brackets attach to each line card to manage and organize the network interface cables.
Line cards installed in the Cisco 12406 Internet Router support online insertion and removal (OIR), which means you can remove and replace (hot swappable) a line card while the Cisco 12406 Internet Router remains powered up.
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Caution To ensure adequate airflow through the card cage, empty card slots must have a card blank installed. |
The Cisco 12406 Internet Router Alarm card performs four distinct functions:
The entire alarm function has been implemented on redundant alarm cards with maintenance and hot swap functionality. The +5 VDC MBus power supply has been integrated onto the alarm cards permitting the use of generic power modules in the system. The 12406 Internet Router offers monitoring of the operational status, output voltage and output current for each of the power supplies in the system.
The Alarm output function consists of a group of relays and their associated drivers connected to an output port on the MBus module. Directed by the software on the route processor (RP), the MBus module on the Alarm card will activate specific relays. The relays are divided into three levels, Critical, Major, and Minor.
The actual determination of what constitutes a Critical, Major or Minor alarm is determined by the IOS software running on the RP.
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Note Previous implementations of Cisco 12406 Internet Router Alarm Cards had 2 classes of alarms (Audible and Visible) which due to board space constraints have been reduced to 1 class visible only, on this Alarm Card. |
Drivers and LEDs are provided on the clock and scheduler card, and the switch fabric card to provide visual OK and FAIL indications for all fabric cards in the system. Redundant signals from the fabric boards are brought out to each Alarm card. The Alarm card has no control over how these LEDs are used.
The MBUS auxiliary power supply consists of a 50W DC-DC converter and some current sharing circuitry. Only one Alarm card is necessary for proper system operation, and they are hot swappable. However, if both are removed, the system will shut down. The output of the DC-DC converter is connected to an analog input pin on the MBUS module for monitoring purposes.
Since the Alarm card itself is powered from this supply, the on board MBus module can only report problems with the supply when the redundant alarm board is installed in the system and is supplying MBus power.
An OK/FAIL pair of LEDs are provided to indicate the status of the Alarm card. The green light indicates that the MBus module on the alarm cards is operating properly. The yellow FAIL light indicates that the Alarm card has detected some error, in itself, or with the MBus power supply.
The alarm card provides monitoring of the power sentry module signals listed in Table A-8.
This detailed description gives you a description of the backplane and pin connector descriptions for the components what connect to it.
Pinout descriptions, pin assignments, signal names and definitions are presented in the following sections and tables.
Backplane connector pinout descriptions are listed in Table A-9.
| Col | Row A | Row B | Row C | Row D |
|---|---|---|---|---|
| Col | Row E | Row F | Row G | Row H |
|---|---|---|---|---|
Table A-12 gives the backplane signal definitions, parity checks and alarm board LED indicator information.
P8 Alarm Relay Contact Connector—This connector is a standard DB-9 connector. The relay interface is rated at max 2A, 60V or 50VA, whichever is greater.
| Pin | Name | Definition |
|---|---|---|
MBus Module Port Pin Assignments—Twenty general purpose pins and four analog input pins on the MBus module are used for this design, they are listed here.
| MBUS pin # | MBUS Pin Name | Signal Name | Definition |
|---|---|---|---|
Output of the local DC-DC converter on the near side of the OR'ing diodes, divided in half (2.5V). |
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The board dimensions are 2.60" x 16.41" (66mm x 417mm) length x height, with a 1.4" pitch center to center. Board thickness - 0.108" (8 layers)
Power Supply Requirements—An alarm card will consume as much as 60W of -48V power as it provides +5 VDC power for the rest or the system. The alarm card receives 48V DC-source power via the backplane. The onboard +5 VDC is derived from the 48V, using a DC-DC device. Onboard converter is rated at +5 VDC at 10A. Actual power consumption at +5 VDC by MBus and alarm LED logic should be less than 1A.
Mechanical characteristics—The alarm board dimensions are 2.66 in. (66mm) wide x 16.41 (417mm) long x height, with a 1.4 in. pitch center to center. Each alarm card is 0.108 inches (8 layers) thick.
The heart of the Cisco 12406 Internet Router is the switch fabric circuity, which provides synchronized gigabit speed interconnections for the line cards and the RP. The switch fabric circuitry is contained on two types of cards, a clock and scheduler card (CSC) and a switch fabric card (SFC), which install in the slots specifically designed for these cards.
A clock and scheduler card is installed in the left side, half width slot specifically designed for these cards in the CSC card cage and switch fabric cards are installed in the right side, half width card slot in the SFC card cage.
The Cisco 12406 Internet Router must have at least 4 fabric cards installed to operate; one of the fabric cards must be a clock and scheduler card.
| Switch Fabric Bandwidth | Clock and Scheduler Card | Switch Fabric Card |
|---|---|---|
| 1 One clock and scheduler card must be installed in a system. |
The clock and scheduler, and switch fabric cards hold the functionality for the system clock, scheduler, switch fabric and switch fabric card redundancy.
The system clock synchronizes data transfers between line cards or the RP and a line card through the switch fabric. In systems with redundant clock and scheduler cards, the two system clocks are synchronized so that if one system clock fails, the other clock takes over. The system clock signal is sent to all line cards, RP, and switch fabric cards.
The scheduler handles requests from the line cards for access to the switch fabric. When the scheduler receives a request from a line card for switch fabric access, the scheduler determines when to allow the line card access to the switch fabric.
Switch fabric circuitry carries the user traffic between line cards or between the RP and a line card. The switch fabric on the clock and scheduler card is identical to the switch fabric on the switch fabric card.
The switch fabric card contains only the switch fabric circuitry, which carries user traffic between line cards or between the RP and the line cards. The switch fabric card receives scheduling information and the system clock sent from the clock and scheduler card.
The second CSC in the Cisco 12406 Internet Router provides data path, scheduler, and reference clock redundancy. The interfaces between the line cards and the switch fabric are monitored constantly. If the system 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 microseconds, with little or no loss of data.
The AC-power entry module is a modular unit that measures 2.75 inches (6.98 cm) high by 8.25 inches (20.96 cm) wide by 17.91 inches (45.49 cm) deep and weighs 14.0 lbs (6.35 kg).
The Cisco 12406 Internet Router requires two AC-power entry modules at all times to meet EMI compliance, EMC standards and to avoid an overheat condition in the router.
An AC-power entry module has the following features.
Two LEDs on the PEM indicate the following:
The backplane distributes power in the Cisco 12406 Internet Router to all cards in the card cage. The power entry modules convert source AC into +5 VDC and -48 VDC. The +5 VDC goes directly to each line card to power the MBus module. The -48 VDC feeds a DC-DC converter also on each card. The MBus module controls the DC-DC converter. When directed by the RP or by MBus software, the MBus module turns on the DC-DC converter; the -48 VDC is converted into +2.5, +3.3 VDC and +5 VDC for use by the card.
Power for the blower modules is supplied directly from the backplane through two harnesses mounted on the frame. An internal blower module controller card converts -48 VDC into a variable DC voltage which powers the blower module fans.
| PIN | GAUGE | SIGNAL | NOTES |
|---|---|---|---|
The Cisco 12406 Internet Router has one blower module located at the rear of the chassis. The blower module maintains acceptable operating temperatures for the internal components by drawing cooling air through the card cages from side to back.
The blower module is a sheet metal enclosure containing three fans, a fan controller card, and two faceplate LEDs.
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Warning Exhaust from other equipment vented directly into the Cisco 12406 Internet Router air inlet may cause an over-heat condition. Allow sufficient air flow by maintaining 6 inches (15.24 cm) of clearance at both the inlet and exhaust openings on the chassis. |
The blower module draws room air in through two air filters on the side of the chassis. See Figure A-10. The blower module draws air through the card cage and out through exhaust vents on the back of the chassis.
The front, back and sides of the Cisco 12406 Internet Router must remain unobstructed to ensure adequate air flow and prevent overheating inside the RP and line card cage. We recommend at least 6 inches (15.2 centimeters) of clearance on all sides.
If the air temperature inside the RP and line card cage rises the system environmental monitor shuts down all internal power to prevent equipment damage from excessive heat.
If the system detects that one of three fans within a blower module has failed, it displays a warning message on the console screen. If multiple fans fail, the system shuts down to prevent equipment damage.
A retractable handle on the blower module provides a grip point for removing and replacing a blower module. See Figure A-8. Two LEDs (one green and one red), provide blower module status. The green LED, when on, indicates all three fans are operating normally. The red LED should remain off during normal operation. If the red LED is on, a fan failure or other fault has been detected in the blower module. The fault can be one or more stopped fans or one or more fans running below speed, or the controller card has a fault.
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Note The configuration note Cisco 12406 Internet Router Blower Module Replacement Instructions , document Part No. 78-13106-xx contain detailed instructions for removing and replacing the blower module. This configuration note accompanies every blower module that is shipped from the factory as an FRU. |
The Cisco 12406 Internet Router is equipped with 2 serviceable air filters. As you face the front of the chassis, the air filters are housed on the right side of the chassis in a narrow vertical slot. Do not run the Cisco 12406 Internet Router without the air filters installed. You should inspect and clean the air filters once a month (more often in dusty environments). Procedures for vacuuming and replacing the air filters are contained in the section "Cleaning and Replacing the Air Filters" in Chapter 5. A copy of the air filter replacement instructions is shipped with the air filters when ordered as an FRU, Cisco 12406 Internet Router Air Filter Replacement Instructions , document Part No. 78-13108-xx. Figure A-10 shows the location of the air filters.
The Cisco 12406 Internet Router cable-management system organizes the interface cables entering and exiting the system, keeping them free of sharp bends (excessive bending in an interface cable can cause performance degradation) and out of the way. See Figure A-11.
The Cisco 12406 Internet Router maintenance bus and MBus modules manage all of the maintenance functions of the system.
The MBus consists of two separate busses (providing MBus redundancy) that link all of the line cards, the RP, the switch fabric cards, the power supplies, and the blower modules. Each component contains an MBus module that allows the component to communicate over the MBus. The MBus module on each component is powered by +5 VDC directly from the power supply and performs the functions of power-up/down control, device discovery, code download, diagnostics, and environmental monitoring and alarms.
Each MBus module directly controls the DC-DC converters on the component it is mounted on based on commands it receives from its on-board EPROM and from the master RP. Each MBus module is tied directly to +5 VDC from the power supply. When power is applied to the Cisco 12406 Internet Router, all MBus modules immediately power up. The MBus modules on the RP or clock and scheduler card 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 master RP.
Device discovery—The RP can determine the system configuration using the MBus. A message is sent from the RP over the MBus requesting all installed devices to identify themselves. The response back provides slot number and card and component type.
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 card under test.
Environmental Monitoring and Alarms—The MBus module on each component monitors that component's environment as follows:
To repackage the Cisco 12406 Internet Router use the repacking instructions in "Repackaging the Cisco 12406 Internet Router" in Chapter 2 or the document "Cisco 12406 Internet Router Unpacking Instructions" document number 78-13109-xx, posted on the outside of the shipping container.
If packing material is lost or damaged, the Cisco 12406 Internet Router packing materials are available as an orderable item, use Product Number: GSR6-PKG=.
Posted: Tue Jan 28 23:20:37 PST 2003
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Important Notices and
