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The physical and functional overview for the Cisco 12410 Gigabit Switch Router (GSR) is presented in the following sections:
The Cisco 12410 GSR is a 10-slot member of the Cisco 12000 series gigabit switch routers. The Cisco 12410 GSR, which is also referred to as the Cisco 12410 Internet router, has the 10-gigabit-per-second (Gbps) per slot switch fabric and supports all of the current Cisco 12000 series line cards, including the latest OC-192c/STM-64c and Quad OC-48c/STM-16c line cards. Standing 37 inches (93.98 cm) high, the Cisco 12410 GSR has been designed so that two systems can fit in most standard 75-inch racks.
A Cisco 12410 GSR without the plastic bezel covers is shown in Figure 1-1.
The Cisco 12410 GSR contains the following components:
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Note When a system only contains 1 RP, it should be installed in slot 9, and slot 8 can be used for a narrower, legacy line card. Slot 8 will not accept an OC-192c/STM-64c or Quad OC-48c/STM-16c line card. |
A conceptual view of the Cisco 12410 GSR, with the slot numbers for the line card and RP card cage and switch fabric and alarm card cage called out, is shown in Figure 1-2.
The main physical components of the Cisco 12410 GSR and their functions are described in the following sections:
The Cisco 12410 GSR is an integrated chassis that contains two card cages:
The line card and RP card cage has 10 user-configurable slots that support a combination of line cards and one or two RPs. Eight of the slots are 1.74 in (4.44 cm) wide and will accept newer OC192 (or Quad OC48) line cards or legacy line cards, and two of the slots are 1.25 in (3.17 cm) wide and will accept RPs or narrower legacy line cards.
The switch fabric and alarm card cage is located behind the air filter door and contains 7 slots for the switch fabric card set and 2 slots for alarm cards. The switch fabric card set is made up of 5 SFCs and 2 CSCs.
Typically, the chassis is configured as either a DC-powered or a AC-powered system at the factory. It contains either two DC power entry modules or two AC power supplies.
Power connections are made on the rear panel; line card and RP connections are made from the front of the chassis directly to the line cards and RPs installed in the system. A rear view of a DC-powered Cisco 12410 GSR is shown in Figure 1-3.
A chassis can be reconfigured from AC to DC, or vice versa, in the field, but this is an elaborate procedure that requires the system be powered down and the power distribution units (PDUs) on the rear of the chassis be replaced along with the AC power supplies or DC power entry modules. A Cisco 12410 GSR can be either DC-powered or AC-powered; it can not accept two different types of power.
The chassis backplane and maintenance bus are described in the following subsections:
The switch fabric and alarm card cage and the line card and RP card cage are tied together electrically through a passive system backplane in the back of the chassis. Nearly all of the wiring in the Cisco 12410 GSR chassis is contained within or connected to the chassis backplane. The chassis backplane distributes DC power to all of the cards and the blower module in the router and provides the physical communication pathway between cards, both for network data and system communication across the internal system maintenance bus (MBus).
The maintenance bus (MBus) and MBus modules in the Cisco 12410 GSR manage all of the maintenance functions of the system.
The MBus consists of two redundant buses that link all of the line cards, the RP, the switch fabric cards, the alarm cards, the power shelf, and the blower modules. Each of these router components contains an MBus module that allows the component to communicate through the MBus.
The MBus power +5 VDC is supplied by a DC-to-DC converter on each alarm card. Thus to have MBus power redundancy, you must have two alarm cards in your system.
The MBus module on each of the alarm cards is individually powered by +5 VDC supplied by a DC-to-DC converter on each alarm card. Both alarm cards also put +5 VDC back onto the chassis backplane to provide power to the MBus modules on the RP, each of the line cards, the blower modules, and the power subsystem.
The MBus modules perform the following functions:
The RP continuously polls the devices on the MBus for out-of-tolerance temperature, voltage, current, and fan rotational speed values. If the RP detects an out-of-tolerance value, it logs a message on the system console and sets the appropriate alarm severity level on the alarm card. Setting an alarm tuns on one of the LED pairs and energizes the appropriate alarm card relays, activating any external audible or visual alarm devices wired to the alarm card.
The line card and RP card cage has 10 slots, as shown in Figure 1-2. These slots are numbered 0 to 9 from left to right. The RPs are installed in slots 8 and 9. The Cisco 12410 GSR supports up to 9 line cards, when only a single RP is installed. Eight of these line cards can be newer OC192 (or Quad OC48) line cards in slots 0 through 7; slots 8 and 9 can accept only RPs or the narrower legacy line cards. With a single RP installed in slot 9, slot 8 can be used to support a legacy line card. Slots 0 through 7 support all the existing Cisco 12000 series GSR line cards, including the latest OC192 line cards.
Each Cisco 12410 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 12410 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. |
If you have a PRP, see the "Performance Route Processor" section.
The GRP is shown in Figure 1-4.
The main functions of the GRP are as follows:
The GRP contains the following components:
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Note Neither SRAM nor NVRAM are user configurable and cannot be upgraded in the field. |
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Note The GRP memory options and instructions for upgrading memory are described in the Cisco 12000 Series Gigabit Switch Router Memory Replacement Instructions, 78-4338-xx. |
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 of the two PCMCIA slots (slot 0 or slot 1) on the front of the GRP. (See Figure 1-5.)
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Note The GRP Flash memory SIMM contains the Cisco IOS software boot image, and a PCMCIA Flash memory card contains the Cisco IOS software image. |
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.
Additional GRP functionality is provided in the following subsections:
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
| 1128 MB of DRAM is the default DRAM configuration for the GRP.
2SRAM is neither user configurable nor field upgradeable. 3NVRAM is neither user configurable nor field upgradeable. 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 12000 series routers. 6Type I or Type II PCMCIA cards can be used in either PCMCIA slot. |
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
| Total DRAM | Product Numbers | DRAM Sockets | Number of DIMMs |
|---|---|---|---|
| 1128 MB is the standard (default) DRAM configuration for the GRP. |
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Caution To prevent memory problems, DRAM DIMMs must be 3.3-volt (V), 60-nanosecond (ns) devices. Do not attempt to install other devices in the DIMM sockets. We recommend that you use the Cisco-approved memory options listed in Table 1-2. |
SRAM provides secondary CPU cache memory. The standard GRP configuration is 512 KB. Its principle function is to act as a staging area for routing table updates and for information set to and received from line cards. SRAM is not user configurable and cannot be upgraded in the field.
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 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.
The GRP faceplate contains two types of system status LEDs: device or port activity indicators and alphanumeric LED displays.
The device or port activity indicators (see Figure 1-6) consist of the following functional groups:
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.
The alphanumeric LED displays router status messages:
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 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 in "System Startup and Performing a Basic Configuration.")
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. But 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.
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.
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)
| PCMCIA Slot 0 (Bottom) | PCMCIA Slot 1 (Top) |
|---|---|
The console and auxiliary ports on the GRP are asynchronous serial ports used to connect external devices to monitor and manage the system. 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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Note EIA/TIA-232 was previously referred to as RS-232 before its acceptance as a standard by the Electronic Industries Association (EIA) and Telecommunications Industry Association (TIA). |
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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Note In order to maintain Class B EMI compliance, shielded cables must be used on the console and auxiliary ports of the GRP= and GRP-B=. An updated version of the GRP-B= board (Rev. F0) is available. This version does not require shielded cables for Class B compliance. |
The GRP has one Ethernet port, which uses one of the following connection types:
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Note The RJ-45 and MII receptacles on the GRP represent two physical
connection options for one Ethernet interface; therefore, you can use
either the MDI RJ-45 connection or the MII connection, but not both
simultaneously. The transmission speed of the Ethernet port is set through an auto-sensing scheme on the GRP. 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. |
Each Cisco 12410 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 12410 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. |
The section describes the Performance Route Processor (PRP) and includes the following information:
If you have a GRP, see the "Gigabit Route Processor" section.
Figure 1-8 shows the front panel view of the PRP.
The PRP is available as Product Number PRP-1=, which includes one PRP with 512 MB of synchronous dynamic random-access memory (SDRAM) and one 64-MB advanced technology attachment (ATA) Flash disk.
The primary functions of the PRP for Cisco 12000 series Internet Routers include:
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 switch fabric connection is the main data path for routing table distribution as well as for packets that are sent between line cards and the PRP.
The PRP contains the following components:
The Cisco IOS software images that run the Cisco 12000 series Internet Router system are stored in Flash memory. Two types of Flash memory ship with the PRP:
1. Onboard Flash memory—Ships as a single in-line memory module (SIMM). This Flash memory contains the Cisco IOS boot image (bootflash) and is not field replaceable.
2. Flash disk—The PRP ships with a Flash disk that can be installed in either Flash disk slot. (See Figure 1-9.) The Flash disk contains the Cisco IOS software image.
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 Internet 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 PRPs SDRAM.
Figure 1-9 shows the locations of the various hardware components on the PRP.
Memory options and functions are listed in Table 1-4.
Table 1-4 PRP Memory Components
| 1Default 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. 2If both banks are populated, bank 1 and bank 2 must contain the same size DIMM. 3SRAM is not user configurable or field replaceable. 4NVRAM is not user configurable or field replaceable. 5Flash memory SIMM is not user configurable or field replaceable. 6ATA Flash disks and Type I and Type II linear Flash memory cards are supported. See the |
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Note If a single DIMM module is installed, it must be placed in bank 1 (U15). |
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.
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.
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 1-5 lists the supported Flash disk sizes and their Cisco product numbers.
Table 1-5 Supported Flash Disk Sizes and 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. |
The PRP faceplate contains 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:
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 display LEDs indicate the following:
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, refer to the "Configuring the Software Configuration Register" section of the chapter "Observing System Startup and Performing a Basic Configuration.") 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. But 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.
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.
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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Note The PRP only supports +5VDC Flash disk devices. It does not support +3.3VDC PCMCIA devices. |
All combinations of different Flash devices are supported by the PRP. 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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Note Type 1 and Type 2 linear Flash memory cards may not have the capacity to meet the requirements of your configuration. |
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 12410 GSR comes pre-installed with the number and type of Cisco 12000 series line cards that you ordered. The router will be configured as follows:
The line cards can be installed in any of the slots of the line card and RP card cage, with the exception of slot 9, which must have an RP.
If the router is equipped with an optional, redundant RP, it must be installed in the slot 8. If the router is not equipped with an optional, redundant RP, a narrower legacy line card can be installed in slot 8. Slot 8 will not support the newer OC192 or Quad OC48 line cards.
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.
A cable-management bracket attaches to the faceplate of each line card to manage and organize the network interface cables for connection to the individual ports on the line card.
Line cards installed in the Cisco 12410 GSR 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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Note Each of the line cards is supported by a Cisco installation and
configuration note that describes the features of the line card and
provides detailed instructions for removing, replacing, and
configuring the line cards. (For more information on a specific line
card, refer to the line card installation and configuration note that
came with the line card.) You can also access Cisco IOS software documentation and hardware installation and maintenance documentation on the World Wide Web at http://www.cisco.com, http://www-china.cisco.com, or http://www-europe.cisco.com. |
The Cisco 12410 GSR can be powered by either DC or AC power subsystem.
This section contains the following subsections:
An AC-powered Cisco 12410 GSR has two 2400-watt AC power supplies installed to provide 2N redundancy.
AC power is connected through the two AC power distribution units (PDUs) on the chassis rear panel. Each AC PDU has one AC power cord receptacle. (See Figure 1-10.) AC power is routed through a an AC power distribution unit to the rear connector on the AC power supply. Retaining clips secure the AC power cord connector to the AC PDU.
Each AC power supply converts 200 to 240 VAC into -48 VDC, which is distributed to the line cards, RP, and blower module through the chassis backplane.
AC power supplies support online insertion and removal (OIR).
Each 2400-watt AC power supply (see Figure 1-11) is inserted into Cisco 12410 GSR chassis from the front of the unit. Each AC power supply has contains the following:
The AC power supply status LEDS provide the following information:
The DC power subsystem consists of two DC power distribution units (PDUs) on the chassis rear panel and two DC power entry modules (PEMs) that are inserted through the front of the chassis. The DC-power subsystem provides 2N redundancy.
DC power is connected to the DC PDU on the rear of the chassis through three pairs of threaded M6 DC-input terminal studs. There are threaded stud pairs for -48/60 V, -48/60V RTN, and safety ground. (See Figure 1-12.) The stud pairs are labeled on the DC PDU and on the flexible plastic safety shield, which provides some isolation between the input-power stud pairs. There is a clear plastic cover which fits over the DC threaded studs to protect the connections.
The DC-input power entry module (see Figure 1-13) is a modular unit that slides in and out of the chassis from the front and is secured by the ejector lever that is fastened to the power entry module faceplate.
Each DC-input power entry module operates from a nominal source DC voltage of -48 to -60 VDC and requires a dedicated 60A service.
A DC PEM has the following faceplate features:
The chassis backplane distributes power to all cards in the line card and RP card cage and the switch fabric and alarm card cage. The blower module also receives power from the chassis backplane through separate shielded wiring harnesses and connectors.
When the router is equipped with the AC-input subsystem, the AC-input power supplies in the power shelf convert a nominal AC source of 220 VAC into -48 VDC. When the router is equipped with the DC-input subsystem, the DC-input power entry modules pass along a nominal DC source of -54 VDC.
The -48 VDC from either an AC power subsystem or a DC power subsystem feeds DC-to-DC converters on each card through the backplane. The MBus module on each card controls the DC-to-DC converters. When directed by the RP or by MBus software, the MBus module turns on the DC-to-DC converters, which convert the -48 VDC into the voltages required by the card.
The -48 VDC power for the blower module is supplied directly from the chassis backplane through a wiring harness and floating connectors built into the chassis. An internal controller card in the blower module converts -48 VDC into a variable DC voltage that powers the blower module fans. The MBus module in the blower module uses +5 VDC from the chassis backplane to power the MBus interface circuitry and the temperature sensor.
The heart of the Cisco 12410 GSR is a crossbar switch fabric that provides synchronized gigabit speed connections between the line cards and the RP. The switch fabric for the Cisco 12410 GSR consists of two clock and scheduler cards and five switch fabric cards installed in the switch fabric and alarm card cage. One clock and scheduler card (CSC) and the four switch fabric cards (SFCs) are required for an active switch fabric; the second CSC and the fifth SFC provide redundancy. The two alarm cards that are located in the switch fabric and alarm card cage are not part of the switch fabric.
Unlike other systems in the Cisco 12000 series GSRs, the Cisco 12410 GSR supports only the latest 10-Gbps switch fabric. Each SFC or CSC card provides a 10-Gbps full-duplex connection to each line card in the system. Thus, for a Cisco 12410 GSR with 10 line cards, each with 2 x 10 Gbps capacity (full duplex), the system switching bandwidth is 10 x 20 Gbps = 200 Gbps.
Figure 1-14 illustrates a switch fabric and alarm card cage with the air filter door swung open. The cards in the switch fabric and alarm card cage are labeled CSC-200, SFC-200, and Alarm. The labeling that identifies which type of card goes in which slot can been seen when the air filter door is opened.
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Note The CSC and SFC cards support online insertion and removal (OIR), which means that you can remove and replace a card while the router remains powered up. |
The Cisco 12410 GSR ships from the factory with two CSCs and five SFCs installed in the five slots in the switch fabric and alarm card cage.
Clock and scheduler cards are installed in slot 0 or slot 1 (labeled CSC 0 or CSC 1); switch fabric cards are installed in slots 2, 3, 4, 5, and 6. (labeled SFC 0, SFC 1, SFC 2, SFC 4, and SFC 5).
The clock and scheduler card provides the following functionality:
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.
LEDs on the faceplate of the external alarm display card display the status of the cards in the switch fabric and alarm card cage. The alarm display card faceplate has one pair of LEDs for each of the 9 card slots (seven fabric cards and two alarm cards) in the switch fabric and alarm card cage. Each pair of LEDs consists of a green LED labeled ENABLED and a yellow LED labeled FAIL. When a green LED is on, the CSC or SFC in the corresponding slot is installed and operational. When the LED is off, either the slot is empty or the card installed in the slot is faulty. When a yellow LED is on, the router has detected a fault on the card in the corresponding slot.
The second CSC in the Cisco 12410 GSR 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 Cisco 12410 GSR has one blower module to distribute air within the chassis. The blower module is located above the line card and RP card cage. The blower module maintains acceptable operating temperatures for the internal components by drawing cooling air through a replaceable air filter into the switch fabric and alarm card cage, and then up through the line card and RP card cage. Figure 1-15 illustrates the cooling air flow.
This section contains the following subsections:
The blower module is a sheet metal enclosure containing three blowers, a blower controller card, a handle, and two faceplate LEDs. (See Figure 1-16.) The blower module has a snap-on plastic front cover mounted over the blower module faceplate. The two blower module LEDs are visible through the front cover. The handle on the blower module provides a grip when removing and replacing the blower module.
The blower module draws room air in through an air filter on the front of the switch fabric and alarm card cage. The front and back of the Cisco 12410 GSR must remain unobstructed to ensure adequate air flow and prevent overheating inside the card cages. We recommend at least 6 inches (15.24 cm) of clearance.
A blower module controller card monitors and controls the operation of the three variable-speed fans in the blower module. The variable-speed feature results in quieter operation by allowing the blower modules to operate at less than maximum speed when doing so provides adequate cooling to maintain an acceptable operating temperature inside the card cages.
Two temperature sensors on each line card monitor the internal air temperature in the card cages. When the ambient air temperature is within normal operating range, the fans operate at their lowest speed, which is 55 percent of the maximum speed. If the air temperature inside the card cages rises, fan speed increases to provide additional cooling air to the internal components. If the internal air temperatures continue to rise beyond the specified threshold, the system environmental monitor shuts down all internal power to prevent equipment damage from excessive heat.
If the system detects that one of the three fans within a blower module has failed, it displays a warning message on the console screen. In addition, the two remaining fans go to full speed to compensate for the loss of the one fan. If another fan fails, the system shut downs to prevent equipment damage.
Two LEDs provide a visual indication of blower module status:
Both LEDs are visible through the blower module snap-on front cover.
The Cisco 12410 GSR is equipped with a serviceable air filter mounted in a swing-down air filter door that covers the switch fabric and alarm card cage. (See Figure 1-14.)
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Caution Do not run the router without an air filter installed. |
You should inspect and clean the air filter once a month (more often in dusty environments). Procedures for vacuuming and replacing the air filter are contained in the "Cleaning and Replacing the Air Filter" section in "Maintaining the Cisco 12410 GSR."
The Cisco 12410 GSR alarm and display cards perform four distinct functions:
This version of the alarm system differs from previous Cisco 12000 series GSR-based systems in that the display indicator LEDs, alarm relays and external alarm relay connectors were moved to a separate card in order to accommodate the mechanical design requirements of the Cisco 12410 GSR enclosure. The external alarm display assembly is mounted on the front of the chassis just above the horizontal cable management tray. (See Figure 1-17.) The alarm display assembly is sometimes referred to as the alarm display card or alarm display.
In addition, the power system monitoring functions were moved from the power-shelf MBUS module, where they are located in the Cisco 12016 GSR (and Cisco 12416 GSR), to the alarm card MBUS module.
The Cisco 12410 GSR uses a cable-management system to organize the network interface cables entering and exiting the chassis, to keep the cables free of sharp bends (excessive bending in a fiber-optic cable can cause performance degradation) and out of the way. The Cisco 12410 GSR cable-management system consists of the following components:
The horizontal cable-management tray is directly above the line card and RP card cage.(See Figure 1-18.) Network interface cables for the line cards in the card cage are led across the tray, and then down through the openings in the bottom of the tray to the individual line cards.
A line card cable-management bracket attaches to each line card with captive screws. There are different types of line card cable-management brackets for different line cards. (See Figure 1-19.) The cable management brackets shown in Figure 1-19 were developed for older line cards.
On line cards with multiple ports, the line card cable management bracket keeps the network interface cables organized when you remove and replace the line card. You can unplug the network interface cables from their connector on the line card and leave the cables clipped in the line card cable-management bracket while you remove the bracket from the line card. That way, when you replace the line card, the network interface cables are already aligned with the correct line card connectors.
Clips on the older brackets hold the network interface cables in place, keep the cables organized relative to the their assigned connectors, and manage the bend radius of each cable as it enters the connector on the line card.
With the release of the OC-192 and Quad OC-48 line cards, a new type of cable management bracket was developed. This bracket has slots and uses velcro straps to secure the network interface cables to the cable management bracket. (See Figure 1-20.) This newer cable management bracket can be used with cards with with different number of ports. For multiple port line cards, you simply use more velcro straps to secure the cables to the cable management bracket.
For more information about the cable-management bracket for a specific line card, refer to the line card installation and configuration note that accompanied the line card.
The field replaceable units (FRUs) for the Cisco 12410 GSR follow:
For technical specifications and compliance information for the Cisco 12410 GSR, see "Technical Specifications."
Posted: Sun Feb 2 20:10:26 PST 2003
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