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This chapter describes the Cisco uBR7200 series universal broadband routers. The chapter contains the following sections:
The Cisco uBR7200 series universal broadband routers comprise Cisco's Cable Modem Termination System (CMTS) solution. Three different chassis are available: the Cisco uBR7223, the Cisco uBR7246, and the Cisco uBR7246 VXR. The routers allow high-speed data services to be packaged similar to basic cable television service or video fare.
The routers are based on Data Over Cable Service Interface Specifications (DOCSIS) and support data and digitized voice connectivity over a bidirectional cable television and IP backbone network. The Cisco uBR7200 series routers typically concentrate traffic from DOCSIS-based cable modems and set-top boxes (STBs) with integrated EuroDOCSIS cable modems on the cable television network and present that traffic to local and remote Internet Protocol (IP) hosts. For NCTA cable plants not fully upgraded to support two-way cable transmission, the routers work in conjunction with dial-up access products to support upstream traffic from DOCSIS-based cable modems connected to the Public Switched Telephone Network (PSTN). The routers support both 6-MHz North American channel plans and 8-MHz Phase Alternating Line (PAL) and Systeme Electronique Couleur Avec Memoire (SECAM) channel plans.
Cisco uBR7200 series universal broadband routers contain:
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Note For detailed information regarding Cisco cable modem cards and procedures for their removal and installation, refer to the Cisco uBR7200 Series Universal Broadband Router Cable Modem Card Hardware Installation (Cisco document number 78-10494-01) field-replaceable unit (FRU) document. |
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Note For a complete list of port adapters supported in the various Cisco uBR7200 series routers, refer to the Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide. |
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Note The Cisco Cable Clock Card is only available in the Cisco uBR7246 VXR. |
| Chassis | Supported NPEs |
|---|---|
Cisco uBR7223 and Cisco uBR7246 | NPE-150, NPE-200 |
Cisco uBR7246 VXR | NPE-300 |
The cable modem cards, port adapters, clock card, NPE, I/O controller, and power supplies slide into their respective chassis slots and connect directly to the router's midplane. There are no internal cables to connect. The midplane distributes power from the power supplies to the I/O controller, cable modem cards, port adapters, clock card, fan tray, and NPE.
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Caution To ensure the proper flow of cooling air across internal components, make sure blank cable modem card, blank port adapters, and a blank clock card are installed in unoccupied chassis slots. Also make sure power supply filler plates (with their attached air dams) are installed in unoccupied power supply bays. |
Cisco uBR7200 series universal broadband routers can be installed on a tabletop or rack mounted. A rack-mount kit ships from the Cisco factory with each router. The rack-mount kit includes the hardware needed to mount the router in a standard 19-inch equipment rack or telco-type rack.
The Cisco uBR7200 series universal broadband routers support:
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Caution You can remove and replace a cable modem card or port adapter with the same type of component without interrupting the system. To replace a cable modem card or port adapter with a different type of card or port adapter (for example, hot swapping from an MC16B to an MC16C or replacing a HSSI adapter with an ATM adapter), you will need to copy your startup configuration to your running configuration on the Cisco uBR7200 series in order to enable the interfaces on the new cable modem card or port adapter. The I/O controller, NPE, and clock card components do not support OIR. You must power down the chassis before removing the I/O controller or NPE. |
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Note For applicable instructions to install, remove, or replace system components, refer to the configuration notes that ship with the FRUs. |
The Cisco uBR7223 contains:
The front of the chassis provides access to the I/O controller, the single-width port adapter, and two cable modem cards, if fully equipped. (See Figure 1-1.)
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Note The Cisco uBR7223 chassis contains one AC-input or DC-input power supply only. |
The rear of the Cisco uBR7223 provides access to the network processing engine and the power supply. (See Figure 1-2.)
A fully configured Cisco uBR7223, with an installed power supply and all slots filled, weighs approximately 75 pounds (34.0 kg). For clearance requirements and rack-mount installation considerations, refer to the "Site Environment" section.
The Cisco uBR7246 contains:
The front of the chassis provides access to the I/O controller, two port adapters, and four cable modem cards, if fully equipped. (See Figure 1-3.)
The rear of the Cisco uBR7246 provides access to the network processing engine and up to two power supplies. (See Figure 1-4.)
A fully configured Cisco uBR7246 operates with only one installed power supply. A second power supply can be installed in the chassis to provide hot-swappable, load-sharing, redundant power.
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Note The Cisco uBR7246 supports dual hot-swappable, load-sharing power supplies. If one power supply fails or is removed, the other power supply maintains system power without interruption. The second power supply immediately takes over the router's power requirements to maintain normal operation. In addition, ensure that you have plugged the two power supplies into separate branch circuits. The Cisco uBR7246 does not support a mix of AC-input and DC-input power supplies in the same chassis. If an AC-input power supply is installed and you want to add a second, redundant power supply, you must add another AC-input power supply. If you want a redundant DC-input power supply configuration, you must remove any installed AC-input power supplies and replace them with two DC-input power supplies. |
A fully configured Cisco uBR7246, with two installed power supplies and all chassis slots filled, weighs approximately 100 pounds (45.4 kg). For clearance requirements and rack-mount installation considerations, refer to the "Site Environment" section.
The Cisco uBR7246 VXR contains:
The front of the chassis provides access to the I/O controller, two port adapters, four cable modem cards, and the clock card if fully equipped. (See Figure 1-5.)
The rear of the Cisco uBR7246 VXR provides access to the network processing engine and up to two power supplies. (See Figure 1-6.)
A fully configured Cisco uBR7246 VXR operates with only one installed power supply. A second power supply can be installed in the chassis to provide hot-swappable, load-sharing, redundant power.
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Note The Cisco uBR7246 VXR supports dual hot-swappable, load-sharing power supplies. If one power supply fails or is removed, the other power supply maintains system power without interruption. The second power supply immediately takes over the router's power requirements to maintain normal operation. In addition, ensure that you have plugged the two power supplies into separate branch circuits. The Cisco uBR7246 VXR does not support a mix of AC-input and DC-input power supplies in the same chassis. If an AC-input power supply is installed and you want to add a second, redundant power supply, you must add another AC-input power supply. If you want a redundant DC-input power supply configuration, you must remove any installed AC-input power supplies and replace them with two DC-input power supplies. |
A fully configured Cisco uBR7246 VXR, with two installed power supplies and all chassis slots filled, weighs approximately 100 pounds (45.4 kg). For clearance requirements and rack-mount installation considerations, refer to the "Site Environment" section.
This section provides a functional overview of the network interfaces available on the Cisco uBR7200 series universal broadband router. The following sections describe port adapter and cable modem card slot and logical interface numbering, as well as MAC address assignments for port adapter and cable modem card interfaces.
In all of the Cisco uBR7200 series universal broadband routers, the slot number is the chassis slot in which a port adapter or a cable modem card is installed, and the logical interface number is the physical location of the interface port on a port adapter.
The Media Access Control (MAC)-layer or hardware address is a standardized data link layer address that is required for certain network interface types. These addresses are not used by other devices in the network; they are specific and unique to each port. The Cisco uBR7200 series uses a specific method to assign and control the MAC-layer addresses of its port adapters. For a description of the MAC-layer address, refer to the "MAC-Layer Address" section.
Port adapter and cable modem card slots maintain the same slot number regardless of whether other port adapters or cable modem cards are installed or removed. However, when you move a port adapter or cable modem card to a different slot, the logical interface number changes to reflect the new slot number.
For complete descriptions and instructions for the commands used to configure your Cisco uBR7200 series, refer to the Configuration Fundamentals Configuration Guide and Configuration Fundamentals Command Reference publications, which are available on the Documentation CD-ROM, CCO, or in print.
The single port adapter and the two cable modem cards in the Cisco uBR7223 provide the connection between the router's three peripheral component interconnect (PCI) buses, called mb0, mb1, and mb2; and external networks. Bus mb0 is for the optional Fast Ethernet port on the I/O controller, bus mb1 is for port adapter slot 1, and cable modem card slot 2; and bus mb2 is for cable modem card slot 3.
In the Cisco uBR7223, the port adapter slot is numbered 1; port adapter slot 0 is the Fast Ethernet port on the I/O controller. Cable modem card slots are numbered 2 and 3. (See Figure 1-7 for the numbering scheme of the port adapter and cable modem card slots.) The number of logical interfaces depends on the type of port adapter or cable modem card.
The two port adapters and the four cable modem cards in the Cisco uBR7246 provide the connection between the router's three peripheral component interconnect (PCI) buses, called mb0, mb1, and mb2; and external networks. Bus mb0 is for the optional Fast Ethernet port on the I/O controller, bus mb1 is for port adapter slot 1, and cable modem card slot 3 and slot 5; and bus mb2 is for port adapter slot 2 and cable modem card slot 4 and slot 6.
In the Cisco uBR7246, port adapter slots are numbered 1 and 2; port adapter slot 0 is the Fast Ethernet port on the I/O controller. Cable modem card slots are numbered from 3 to 6. (See Figure 1-8 for the numbering scheme of the port adapter and cable modem card slots.) The number of logical interfaces depends on the type of port adapter or cable modem card.
The two port adapters and the four cable modem cards in the Cisco uBR7246 VXR provide the connection between the router's three peripheral component interconnect (PCI) buses, called mb0, mb1, and mb2; and external networks. Bus mb0 is for the optional Fast Ethernet port on the I/O controller, bus mb1 is for port adapter slot 1, and cable modem card slot 3 and slot 5; and bus mb2 is for port adapter slot 2 and cable modem card slot 4 and slot 6.
In the Cisco uBR7246 VXR, port adapter slots are numbered 1 and 2; port adapter slot 0 is the Fast Ethernet port on the I/O controller. Cable modem card slots are numbered from 3 to 6. (See Figure 1-9 for the numbering scheme of the port adapter and cable modem card slots.) The number of logical interfaces depends on the type of port adapter or cable modem card.
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Note Some port adapters available for the Cisco uBR7246 VXR only work if a minimum hardware revision requirement has been satisfied. Refer to the Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide for specific information. |
All LAN interfaces (ports) require unique MAC-layer addresses, also known as hardware addresses. Typically, the MAC address of an interface is stored on a memory component that resides directly on the interface circuitry; however, the OIR feature requires a different method. For a description of OIR, refer to the "RF and Digital Data Overview" section.
The OIR feature allows you to remove a port adapter or cable modem card and replace it with another identically configured one. If the new port adapter or cable modem card matches the port adapter or cable modem card you removed, the system immediately brings it online. In order to allow OIR, an address allocator with a unique MAC address is stored in an EEPROM on the universal broadband router midplane. Each address is reserved for a specific port and slot in the router regardless of whether a port adapter or a cable modem card resides in that slot.
The MAC addresses are assigned to the slots in sequence. The first addresses are assigned to port adapter slot 0 and slot 1, and the next addresses are assigned to port adapter slot 2 through cable modem card slot 6. This address scheme allows you to remove port adapters or cable modem cards and insert them into other universal broadband routers without causing the MAC addresses to move around the network or be assigned to multiple devices.
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Note Storing the MAC addresses for every slot in one central location means the addresses stay with the memory device on which they are stored. |
Cisco uBR7200 series universal broadband routers are installed at a cable television headend or a distribution hub. Related networking and RF equipment, servers, and other host computers are installed, along with the Cisco uBR7200 series routers, to support digital data transmission.
To deliver data and VoIP services over the cable television system, TV channels are allocated to carry digital data. Data is modulated downstream on:
The following sections illustrate the supported configurations including:
Figure 1-10 shows the architecture of a typical two-way hybrid fiber coaxial (HFC) network, equipped to support two-way data communication.
A Cisco uBR7200 series universal broadband router and an IF-to-RF upconverter are installed at the headend or distribution hub. The Cisco uBR7200 series downstream ports transmit IF signals to the upconverter, which translates the downstream signals to RF for broadcast. The Cisco uBR7200 series enables you to transmit downstream data in both the 6-MHz North American and the 8-MHz European channel environments.
Receivers, scramblers, and descramblers process the television signals to encode or decode signals as needed for broadcast. Modulators format the analog television and digital signals.
The analog and digital signals then pass through the RF combiner---cables, amplifiers, and taps at the headend. The signals are broadcast from the headend through optical transmitters typically to fiber nodes in the network. Amplifiers, coaxial cable, and taps carry the signals to the subscriber premises. Signals are processed as follows:
Cisco provides a configuration tool with every Cisco uBR7200 series universal broadband router---Cisco Network Registrar (CNR)---to automate dynamic IP address allocation to cable modems, PCs, and other devices on the broadband network.
In addition, Cisco provides an integrated suite of configuration tools, including CNR, for relatively large cable networks called Cisco Subscriber Registration Center (CSRC). CSRC allows large-scale configuration and management of broadband modems. Leveraging the extensibility of CNR, CSRC enables and administers subscriber self-registration. The directory-enabled architecture of CSRC allows it to integrate with LDAP version 3 directory servers.
For more information on CSRC and CNR involvement in the cable network, refer to the CSRC and CNR documentation and the Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide.
The Cisco uBR7200 series supports VPN services. Figure 1-11 shows a typical VPN architecture. VPNs can be initiated at a cable modem residing at a subscriber site or can be initiated by the CMTS at the headend or distribution hub depending upon your particular Cisco IOS software image.
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Note VPN typically involves use of encryption/decryption. Encryption/decryption is subject to export licensing controls. For more information, refer to "Specifications and Export Restrictions." |
Figure 1-12 shows a typical two-way configuration involving voice over IP (VoIP) telephony services. The Cisco uBR7200 series supports the transmission of digitized voice and facsimile traffic over the cable and IP backbone network.
In telco return configurations, the Cisco uBR7200 series universal broadband router provides downstream data flow from cable modem cards connected to the cable system and accepts upstream traffic via a combination of the local PSTN and IP network path that terminates at the Cisco uBR7200 series router. Upstream data transmission takes place over a telephone modem (external or internal to a cable modem, as well as a cable modem card in a PC, based on the third-party cable modem vendor) connected to an analog telephone line. Figure 1-13 illustrates a telco return configuration.
Most Cisco uBR7200 series universal broadband router components are FRUs. These units consist of:
Instructions to install, remove, replace or configure these units are contained in separate documents called FRU documents.
The network processing engine performs the following system management functions:
The network processing engines used in the routers include the NPE-150, NPE-200, and NPE-300. Figure 1-14 shows the NPE-150. Figure 1-15 shows the NPE-200. Figure 1-16 shows the NPE-300.
The network processing engines consist of the following components:
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Note Refer to the Network Processing Engine Replacement Instructions (Cisco document number 78-3225-12) for instructions to remove and replace this component. This document accompanies each engine shipped from the Cisco factory as a FRU. The document is also available on the Documentation CD-ROM and on Cisco Connection Online (CCO). |
Table 1-2 lists the network processing engine memory components.
| Memory Type | Size | Quantity | Description | Location |
|---|---|---|---|---|
DRAM | 32 to 128 MB | 2 to 4 | 16- or 32-MB SIMMs (based on maximum DRAM required) | Bank 0: U18 and U25 or U11 and U251 Bank 1: U4 and U12 or U42 and U522 |
SRAM NPE-150 |
1 MB |
8 |
8 chips, each being 128K x 9 bits wide |
U700 through U703 |
NPE-200 | 4 MB | 8 | 8 chips, each being 512K x 8 bits wide | U6, U10, U13, U14, U28, U29, U38, and U39 |
Boot ROM3 |
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NPE-200 | 256 KB | 1 | EPROM for the ROM monitor program | Socket U92 |
Unified cache | 512 KB | 4 | Secondary cache for the R4700 | NPE-150 |
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| Secondary cache for the R5000 | NPE-200 |
Table 1-3 lists the NPE-300 memory specifications.
| Memory Type | Size | Quantity | Description | Location |
|---|---|---|---|---|
SDRAM | 32 to 128 MB | 1 configurable1 bank with 2 SDRAM slots | 32-, 64-, or 128-MB DIMMs (based on maximum SDRAM required) | Bank 1: U45 and U442 |
Boot ROM | 512 KB | 1 | OTP3 ROM for the ROM monitor program | Socket U1 |
Primary cache | 16 KB (instruction), 16 KB (data) |
| RM7000 processor primary internal cache | Socket U49 |
Unified cache | 256 KB |
| Secondary RM7000 processor internal, unified instruction and data cache | Socket U49 |
Integrated cache | 2 MB (fixed) |
| Tertiary external cache for the RM7000 processor |
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| 1Bank 0 is used exclusively for packet memory and is not user configurable. 2Bank 1 contains the Cisco IOS software, processor memory, and packet memory. 3OTP = one time programmable. |
Table 1-4 lists the NPE-150 and NPE-200 factory-installed DRAM configurations and their product numbers.
| Total DRAM1 | DRAM Bank 0 | Quantity | DRAM Bank 1 | Quantity | Product Number |
|---|---|---|---|---|---|
32 MB | U18 and U25 or | 2 16-MB SIMMs | U4 and U12 or | - | MEM-NPE-32MB2 |
64 MB | U18 and U25 or | 2 32-MB SIMMS | U4 and U12 or | - | MEM-NPE-64MB2 |
128 MB | U18 and U25 or | 2 32-MB SIMMs | U4 and U12 or | 2 32-MB SIMMs | MEM-NPE-128MB2 |
| 1Refer to the Cisco AS5800 universal access server documentation for Cisco AS5800 universal access server DRAM options. 2These products are also available as DRAM upgrades. For example, to upgrade a network processing engine from 32 MB to 64 MB of DRAM, order Product Number MEM-NPE-32MB=. |
The Input/Output controller shares the environmental monitoring and system memory functions for the router with the network processing engine.
The I/O controller consists of the following components:
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Note When using the I/O controller that is equipped with an MII receptacle and an RJ-45 receptacle, only one receptacle can be configured for use at a time. Many of the initial shipments of Cisco uBR7246 chassis that were equipped with a Fast Ethernet I/O controller, have an I/O controller with a single MII receptacle installed. These I/O controllers are fully compatible with the router, and they are still supported; however, they are no longer available as spares. |
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Note There are currently two distinct I/O controller designs featuring a Fast Ethernet port. Your particular I/O controller will look like either of those displayed in Figure 1-17. There is no functional difference between these two I/O controllers with the Fast Ethernet port. |
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Note There are currently two distinct I/O controller designs without a Fast Ethernet port. Your particular I/O controller will look like either of those displayed in Figure 1-18. There is no functional difference between these two I/O controllers without the Fast Ethernet port. |
Table 1-5 lists the I/O controller memory components.
| Memory Type | Size | Quantity | Description | Location |
|---|---|---|---|---|
Boot ROM | 256 KB | 1 | EPROM for the ROM monitor program | Socket U20 |
Flash SIMM Flash memory card | 4 MB 16 and 20 MB | 1 Up to 2 | Contains the default boot helper image Contains the default Cisco IOS image | Socket U99 PCMCIA |
NVRAM | 128 KB | 1 | Nonvolatile EPROM for the system configuration file | Socket U41 |
Depending on whether the Fast Ethernet port is present, either two or four LEDs on the I/O controller faceplate indicate system status; two additional LEDs indicate the status of the Flash memory cards installed in either PCMCIA slot.
Figure 1-20 shows the LEDs on an I/O controller that does not have the Fast Ethernet port. Figure 1-19 shows the LEDs on an I/O controller with the Fast Ethernet port that is equipped with an MII receptacle and an RJ-45 receptacle. Table 1-6 lists I/O controller LEDs and their functions. To use the LEDs for troubleshooting the I/O controller, refer to the "Identifying Startup Problems" section.
A CPU reset button is located next to the IO power OK LED on the I/O controller faceplate. The CPU reset button resets the entire system.
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Caution To prevent system errors and problems, use the CPU reset button only at the direction of your service representative. |
| LED | Function |
|---|---|
Enabled | Indicates that the network processing engine and the I/O controller are enabled for operation by the system; however, it does not mean that the Fast Ethernet port on the I/O controller is functional or enabled. This LED goes on during a successful router boot and remains on during normal operation of the router. |
IO Power OK | Indicates that the I/O controller is receiving DC power from the router midplane. This LED goes on during a successful router boot and remains on during normal operation of the router. |
FE ENABLE | Indicates that the Fast Ethernet port is initialized and enabled for operation by the system. This LED goes on after the I/O controller has been enabled and remains on during normal operation of the router. |
FE LINK | Indicates that the Fast Ethernet port has established a valid link with the network. This LED remains off during normal operation of the router, unless there is an incoming carrier signal. |
MII EN | Indicates that the Fast Ethernet port's MII receptacle is initialized and enabled by the system, and is configured for operation. This LED goes on after the I/O controller has been enabled and the MII receptacle has been configured as the media type for the Fast Ethernet port (the RJ-45 receptacle is the default media type for the Fast Ethernet port). This LED remains on during normal operation of the router. |
RJ45 EN | Indicates that the Fast Ethernet port's RJ-45 receptacle (the default media type for the Fast Ethernet port) is initialized and enabled by the system. This LED goes on after the I/O controller has been enabled and remains on during normal operation of the router. |
RJ45 LINK | Indicates that the Fast Ethernet port's RJ-45 receptacle has established a valid link with the network. This LED remains off during normal operation of the router unless there is an incoming carrier signal. |
Slot 0 Slot 1 |
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Note An MII Link LED is not provided on the I/O controller because the LED is provided on external transceivers that are required for connecting to the MII receptacle on the I/O controller. |
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Note Refer to the Input/Output Controller Replacement Instructions (Cisco document number 78-3224-10) for instructions to remove or replace this component. This document accompanies every I/O controller shipped from the Cisco factory as a FRU. The document is also available on the Documentation CD-ROM and on CCO. If you order an I/O controller as a spare for a Cisco uBR7200 series, use the product numbers UBR7200-I/O= (without a Fast Ethernet port) or UBR7200-I/O-FE= (with a Fast Ethernet port). These I/O controllers have the Cisco IOS software images used by the Cisco uBR7200 series loaded on the Flash memory SIMMs. |
Cisco cable modem cards, together with IF-to-RF upconverters, serve as the radio frequency (RF) interface between the cable headend and Data Over Cable Service Interface Specifications (DOCSIS)-based cable modems or EuroDOCSIS-based cable modems and set-top boxes (STBs). Cisco cable modem cards separate downstream output and upstream input cable interfaces on the Cisco uBR7200 series universal broadband router to enable downstream and upstream signal combining and splitting arrangements.
Cisco cable modem cards can be used in both 6-MHz National Television Systems Committee (NTSC) standard and 8-MHz PAL/SECAM standard channel environments.
The cable modem cards connect directly to the universal broadband router's midplane. Cable modem cards installed in the Cisco uBR7200 series support OIR. The downstream ports must be connected to intermediate frequency IF-to-RF upconverter hardware.
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Note For detailed information regarding Cisco cable modem cards and procedures for their removal and installation, refer to the Cisco uBR7200 Series Universal Broadband Router Cable Modem Card Hardware Installation (Cisco document number 78-10494-01) FRU document. |
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Caution To ensure adequate airflow across the router's cable modem cards, a cable modem card or a blank cable modem card must be installed in each cable modem card slot. |
Cisco port adapters connect directly to the Cisco uBR7200 series universal broadband router's midplane. Port adapters installed in the Cisco uBR7200 series support OIR. For a complete list of port adapters supported in the various Cisco uBR7200 series routers, refer to the Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide.
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Caution To ensure adequate airflow across the router's port adapters, a port adapter or a blank port adapter must be installed in each port adapter slot. |
The Cisco Cable Clock Card is a dual-port field-replaceable component that is designed to provide a reliable national clock signal to the Cisco uBR7246 VXR. The primary and secondary DB-15 interfaces on the front of the clock card connect to external T1 clock signal sources.
When installed in the Cisco uBR7246 VXR chassis, the clock card can propagate a national clock signal throughout the router's midplane by locking onto an external T1 signal originating over the PSTN, locking onto a T1 clock signal originating from a port adapter installed in the same chassis, or by connecting to a Global Positioning System (GPS) receiver generating a T1 clock signal. The clock card does not support OIR.
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Note To install, remove, or replace a clock card, refer to the document Cisco Cable Clock Card Hardware Installation (Cisco document number 78-10634-01). To configure a clock card, refer to the Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide. |
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Caution To ensure adequate airflow across the router's components, a clock card or a blank clock card cover plate must be installed in the clock card slot on the Cisco uBR7246 VXR. |
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Note Refer to "Manufacturers for Headend Provisioning Requirements" for a list of external T1 components to which Cisco recommends you connect the clock card. |
The power supply contains a main power switch, OK LED, and either an AC-input power receptacle, or two hardwired DC-input power leads and three M5 grounding connectors (depending on the type of installed power supply). Adjacent to the lower power supply bay, two M5 chassis grounding receptacles provide a chassis ground connection for electrostatic discharge (ESD) equipment or a two-hole grounding lug for the AC-input power supplies.
The Cisco uBR7200 series universal broadband router comes equipped with one 550W, AC-input or DC-input power supply. If you purchased a Cisco uBR7246 VXR or Cisco uBR7246 and you want to install a second power supply, you must order the second power supply separately. (The Cisco uBR7223 will not accommodate a second power supply.)
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Note Detailed instructions for handling and replacing the Cisco uBR7200 series universal broadband router power supplies are contained in the documents Cisco uBR7200 Series Universal Broadband Router 550-Watt AC-Input Power Supply Replacement Instructions (Cisco document number 78-4848-05) and Cisco uBR7200 Series Universal Broadband Router 550-Watt DC-Input Power Supply Replacement Instructions (Cisco document number 78-5358-03). These documents accompany every 550W, AC-input and DC-input power supply that is shipped from the factory as a FRU. These documents are also available on the Documentation CD-ROM and on Cisco Connection Online (CCO). |
A handle on the AC-input and DC-input power supply units provides a grip point for removing and replacing the power supply. (Figure 1-21 shows the faceplate of the AC-input power supply. Figure 1-22 shows the faceplate of the DC-input power supply.) Two captive installation screws secure the power supply to the chassis and seat the power supply in the router midplane. A Power OK LED indicates that the power supply is delivering +5 VDC to the router midplane.
The AC-input power supply has a receptacle for an AC-input power cable. A modular power cable connects the AC-input power supply to the site AC power source. A cable-retention clip secures the power cable to the AC-input power supply.
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Note Each AC-input power supply has an electrical current rating of 7A. |
The DC-input power supply has a receptacle for two DC-input power leads. Three M5 grounding receptacles are located on the front of the DC-input faceplate to provide connection for a ground lead. A ground lead should be installed on two of the receptacles; either using the two receptacles that are aligned vertically or the two receptacles that are aligned horizontally. A cover is attached to two strain-relief studs on the power supply faceplate to secure the DC-input power leads running behind the cover.
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Note Each DC-input power supply has an electrical current rating of 14A, 700 VA. Use a minimum of 12 AWG (4 mm2) wire for the input to each DC-input power supply. The power input must be protected by a 20A circuit breaker or fuse that is in compliance with your local electric regulations. |
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Caution To ensure adequate airflow across the Cisco uBR7246 VXR and Cisco uBR7246 universal broadband routers' power supplies, a power supply or a power supply filler plate (with its attached air dam) must be installed in each power supply bay. |
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Note See "Specifications and Export Restrictions," for AC-input and DC-input power supply system power specifications, including input voltage and operating frequency ranges. |
The Power OK LED goes off and the power supply will shut itself down when the internal DC voltages exceed allowable tolerances or the internal temperature of the power supply exceeds allowable tolerances. The power supply will then attempt to restart itself within 10 seconds of the shutdown. If the power supply cannot restart itself on the first attempt, it will repeat the automatic restart sequence until the power switch is manually switched to the OFF position, or the power cord is disconnected from the back of the power supply or the power source. For a description of power-supply shutdown conditions and thresholds, refer to the "Environmental Monitoring and Reporting Functions" section.
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Caution When the input power to a Cisco uBR7200 series universal broadband router power supply is disconnected or lost, the power supply will enter a reset cycle for 10 seconds. Wait at least 10 seconds or move the power switch from one position to the other to restart the power supply. For example, if the power supply was ON when the power was disconnected or lost, move the power switch to the OFF position then back to the ON position. If you do not wait the full 10 seconds or move the power switch from one position to the other, the power supply will not restart. |
The fan tray for the Cisco uBR7223, shown in Figure 1-23, consists of four fans that are attached to a metal tray, and the fan tray for the Cisco uBR7246 VXR and Cisco uBR7246, shown in Figure 1-24, consists of seven fans that are attached to a metal tray. In each of the Cisco uBR7200 series universal broadband routers, the fan tray is located on the left side of the chassis (when viewing the router from the front) and receives 12 VDC through a DC power harness that connects directly to the router midplane. To remove the fan tray from the chassis, loosen the captive installation screw on the front of the fan tray and slide the tray out, using the attached handle.
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Note Detailed instructions for removing and replacing the fan tray are contained in the document Cisco uBR7200 Series Universal Broadband Router Fan Tray Replacement Instructions (Cisco document number 78-4939-05). This document accompanies every fan tray that is shipped from the factory as a FRU. The document is also available on the Documentation CD-ROM and on Cisco Connection Online (CCO). |
The fan tray draws cooling air in through the intake vent on the right side of the chassis (when viewing the router from the front), and moves the air across the internal components and out the exhaust vent on the left side of the chassis.
Figure 1-25 shows the airflow through the router.
The left and right sides of the chassis must remain unobstructed to ensure adequate airflow and prevent overheating inside the chassis; Cisco recommends at least 3 inches of clearance. (See the "Site Requirements" section.)
Temperature sensors on the network processing engine and I/O controller monitor the internal air temperature and send warning messages when the internal air temperature approaches a specified threshold. If the internal temperature exceeds the specified threshold, the system environmental monitor shuts down all internal power to prevent equipment damage from excessive heat.
The front of the Cisco uBR7223 chassis has one slot for a single-width port adapter, two slots for cable modem cards, one slot for an I/O controller, one slot for a fan tray, and one bay for the subchassis and midplane. (See Figure 1-26.)
The front of the Cisco uBR7246 chassis has two slots for single-width port adapters (or one dual-width port adapter), four slots for cable modem cards, one slot for an I/O controller, one slot for a fan tray, and one bay for the subchassis and midplane. (See Figure 1-27.)
The front of the Cisco uBR7246 VXR chassis has two slots for single-width port adapters (or one dual-width port adapter), four slots for cable modem cards, one slot for an I/O controller, one slot for a national clock card, one slot for a fan tray, and one bay for the subchassis and midplane. (See Figure 1-28.)
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Note To replace the Cisco uBR7200 series chassis, you must remove all of its internal components; therefore, when replacing the chassis, refer to the documents that explain how to remove and replace the internal components. These documents accompany every chassis that is shipped from the factory as a FRU. The documents are also available on the Documentation CD-ROM and on Cisco Connection Online (CCO). |
The following sections describe the subchassis and midplane characteristics for the Cisco uBR7200 series.
The Cisco uBR7223 subchassis (the rear of the Cisco uBR7223) has one bay for a power supply and one slot for a network processing engine. (See Figure 1-29.)
The cable-modem-card side of the Cisco uBR7223 midplane has two connectors for cable modem cards, one connector for a port adapter, one connector for an I/O controller, and one connector for a fan tray. The power supply side of the midplane has one connector for power supply and one connector for the network processing engine. The midplane supplies DC power to the router's internal components.
The Cisco uBR7246 VXR and Cisco uBR7246 subchassis (the rear of the Cisco uBR7246 VXR and Cisco uBR7246) have two bays for power supplies and one slot for a network processing engine. In both cases, the subchassis also houses the router midplane. (See Figure 1-30.)
The cable-modem-card side of the Cisco uBR7246 VXR and Cisco uBR7246 midplane has four connectors for cable modem cards, two connectors for port adapters, one connector for an I/O controller, and a connector for the fan tray. The Cisco uBR7246 VXR also features one connector for a clock card. The power supply side of the midplane has two connectors for power supplies and one connector for a network processing engine. The midplane supplies DC power to the router's internal components.
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Note You must replace the entire subchassis in order to replace the router midplane in Cisco uBR7200 series universal broadband router. |
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Note Refer to the Cisco uBR7200 Series Universal Broadband Router Subchassis and Midplane Replacement Instructions (Cisco document number 78-5193-04) for instructions to remove or replace the subchassis or midplane. This document accompanies every subchassis and midplane shipped from the Cisco factory as a FRU. The document is also available on the Documentation CD-ROM and on CCO. |
The Cisco uBR7200 series universal broadband router supports up to two installed Cisco-provided Type II PCMCIA Flash memory cards.
Flash memory (Flash memory cards and the Flash SIMM on the I/O controller) allows you to remotely load and store multiple system and boot helper images. You can download a new image over the network and then add the new image to Flash memory or replace existing files. You can also transfer images between Flash memory cards and the onboard Flash memory SIMM. You can then boot the router either manually or automatically from any of the stored images. Flash memory can also function as a TFTP server to allow other routers to boot remotely from stored images or copy them into their own Flash memory.
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Note Refer to the Memory Replacement Instructions for the Network Processing Engine and Input/Output Controller (Cisco document number 78-3226-13) for instructions to remove or replace Flash memory cards and memory SIMMs. This document accompanies every Flash memory card shipped from the Cisco factory as a FRU. The document is also available on the Documentation CD-ROM and on CCO. |
Table 1-7 lists the Flash memory card options supported by the Cisco uBR7200 series.
| Memory Size | Product Number |
|---|---|
16 MB | MEM-I/O-FLC16M1 |
20 MB | MEM-I/O-FLC20M1 |
| 1These products are also available as Flash memory card upgrades. To order an upgrade, add an equal sign (=) after the product number, for example, MEM-I/O-FLC16M=. |
Posted: Tue Mar 28 09:13:41 PST 2000
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