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Product Numbers: PWR-UBR7200-AC, PWR-UBR7200-AC=, PWR-UBR7200/2-AC, CHAS-UBR7246=
This document explains how to remove and replace the 550-watt (W) AC-input power supply in the Cisco uBR7246 universal broadband routers. It includes instructions for powering down the router, removing an installed power supply, and installing a new power supply. This document also includes steps for verifying the initialization of the system after you power up the Cisco uBR7246 universal broadband router.
The following sections are included in this document:
The Cisco IOS software running your router contains extensive features and functionality. The effective use of many of these features is easier if you have more information at hand. For additional information on configuring and maintaining the Cisco uBR7246 universal broadband routers, the following documentation resources are available:
The Cisco uBR7246 is part of a new class of Cisco data-over-cable products designed to allow two-way transmission of digital data over hybrid fiber coaxial (HFC) cable. The Cisco uBR7246 supports Internet Protocol (IP) routing with a wide variety of protocols and any combination of Ethernet, Fast Ethernet, high-speed serial interface (HSSI), and asynchronous transfer mode (ATM) media.
Network interfaces reside on port adapters that provide the connection between the router and external networks (the Internet). HFC interfaces reside on cable modem cards and provide the connection to the cable television (CATV) network. The Cisco uBR7246 has four slots for cable modem cards, two slots for port adapters, one slot for an Input/Output (I/O) controller, and one slot for a network processing engine. You can place the port adapters in either of the two available slots and the cable modem cards in any of the four available slots.
There are bays for up to two AC-input power supplies. The Cisco uBR7246 will operate with one power supply. While a second power supply is not required, it allows load sharing and increased system availability.
The front of the Cisco uBR7246 provides access to an I/O controller, up to two network interface port adapters, and up to four cable modem cards (see Figure 1). The I/O controller contains the following: a local console port for connecting a data terminal (or data terminal equipment [DTE]) and an auxiliary port for connecting a modem (or other data communications equipment [DCE]) or other devices for configuring and managing the router; two Personal Computer Memory Card International Association (PCMCIA) slots for Flash memory cards; an optional Fast Ethernet port. The Fast Ethernet port provides a 100-Mbps connection to the network.
The port adapters installed in the Cisco uBR7246 are of the same type as those installed in the Cisco 7200 series routers and on the second-generation Versatile Interface Processors (VIP2s) in the Cisco 7500 series routers. The port adapters installed in the Cisco uBR7246 support OIR
 | Caution The I/O controller does not support OIR. You must power down the Cisco uBR7246 before removing the I/O controller from the universal broadband router. |
| Caution The cable modem cards currently available for field trials do not support OIR. You must power down the Cisco uBR7246 before removing any of these cable modem cards from the universal broadband router. |
Port adapter slots in the Cisco uBR7246 universal broadband router are numbered from left to right, port adapter slot 1 and port adapter slot 2. Port adapter slot 0 is the Fast Ethernet port on the I/O controller (refer to Figure 3). The cable modem card slots are numbered from top to bottom, cable modem card slot 3, slot 4, slot 5, and slot 6.
In Figure 1 and Figure 2, a blank port adapter is installed in the slot 1. To ensure adequate airflow across the port adapters and cable modem cards, each port adapter slot must be filled with a port adapter or a blank port adapter and each cable modem card slot must be filled with a cable modem card or a blank cable modem card.
The rear of the Cisco uBR7246 universal broadband router provides access to the network processing engine and up to two power supplies (refer to Figure 3).
| Caution The network processing engine does not support OIR. You must power down the Cisco uBR7246 before removing the network processing engine from the router. |
The network processing engine has no external connectors or LEDs. There is a handle for removing and installing the network processing engine and two captive installation screws for securing it to the chassis.
The Cisco uBR7246 router comes equipped with one 550W AC-input power supply. A fully configured Cisco uBR7246 universal broadband router operates with only one installed power supply; however, a second, optional power supply provides hot-swappable, load-sharing, redundant power. Figure 3 shows the rear of a Cisco uBR7246 universal broadband router configured with two AC-input power supplies.
The power supply has the router's main power switch, OK LED, and an AC-input power receptacle. Adjacent to the lower power supply bay there are two M5 chassis ground receptacles that provide a chassis ground connection for ESD equipment or a two-hole grounding lug.
Seven internal fans draw cooling air into chassis and across internal components to maintain an acceptable operating temperature. (Refer to Figure 3.) The seven fans are enclosed in a tray that is located in the subchassis
| Caution To ensure the proper flow of cooling air across the internal components, make sure blank port adapters are installed in unoccupied port adapter slots, blank cable modem cards are installed in unoccupied cable modem card slots, and power supply filler plates and their attached air dams are installed in unoccupied power supply bays. |
The I/O controller, port adapters, cable modem cards, fan tray, power supplies, and network processing engine slide into their respective chassis slots and connect directly to the universal broadband router's midplane; there are no internal cables to connect. The midplane distributes DC power from the power supplies to the I/O controller, port adapters, cable modem cards, fan tray, and network processing engine.
The midplane also identifies OIR of the port adapters, bridges the PCI buses from the port adapters to packet static random-access memory (SRAM) on the network processing engine, arbitrates traffic across the PCI buses, and generates the clock signals for the port adapters on each PCI bus.
A fully configured Cisco uBR7246 universal broadband router comes equipped with one 550W, AC-input power supply. An optional, second AC-input power supply is available for the router; it must be ordered. The router operates with one installed power supply; however, the second power supply provides hot-swappable, load-sharing redundant power.
The faceplate of the 550W AC-input power supply has a green OK LED, a power switch, a handle for removing, installing, and handling the power supply, an AC-input power receptacle, and two captive installation screws (refer to Figure 4).
The power supply handle provides a grip point for pulling the power supply out of the router (refer to Figure 5). The two captive installation screws secure the power supply in the router. A modular power cable connects the AC-input power supply to the site AC power source.
A cable-retention clip on the power supply secures the cable in the power supply and provides strain relief for the power cable. The power switch turns the power supply on and starts the system.
Following are safety guidelines that you should follow when working with any equipment that connects to electrical power or telephone wiring.
Safety warnings appear throughout this publication in procedures that, if performed incorrectly, might harm you. A warning symbol precedes each warning statement.
 | Warning This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. To see translations of the warnings that appear in this publication, refer to the Regulatory Compliance and Safety Information document that accompanied this device. |
Waarschuwing Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel kan veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust te zijn van de bij elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van standaard maatregelen om ongelukken te voorkomen. Voor vertalingen van de waarschuwingen die in deze publicatie verschijnen, kunt u het document Regulatory Compliance and Safety Information (Informatie over naleving van veiligheids- en andere voorschriften) raadplegen dat bij dit toestel is ingesloten.
Varoitus Tämä varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa ruumiinvammaan. Ennen kuin työskentelet minkään laitteiston parissa, ota selvää sähkökytkentöihin liittyvistä vaaroista ja tavanomaisista onnettomuuksien ehkäisykeinoista. Tässä julkaisussa esiintyvien varoitusten käännökset löydät laitteen mukana olevasta Regulatory Compliance and Safety Information -kirjasesta (määräysten noudattaminen ja tietoa turvallisuudesta).
Attention Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation pouvant causer des blessures ou des dommages corporels. Avant de travailler sur un équipement, soyez conscient des dangers posés par les circuits électriques et familiarisez-vous avec les procédures couramment utilisées pour éviter les accidents. Pour prendre connaissance des traductions d'avertissements figurant dans cette publication, consultez le document Regulatory Compliance and Safety Information (Conformité aux règlements et consignes de sécurité) qui accompagne cet appareil.
Warnung Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer Körperverletzung führen könnte. Bevor Sie mit der Arbeit an irgendeinem Gerät beginnen, seien Sie sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur Vermeidung von Unfällen bewußt. Übersetzungen der in dieser Veröffentlichung enthaltenen Warnhinweise finden Sie im Dokument Regulatory Compliance and Safety Information (Informationen zu behördlichen Vorschriften und Sicherheit), das zusammen mit diesem Gerät geliefert wurde.
Avvertenza Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare infortuni alle persone. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli relativi ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di incidenti. La traduzione delle avvertenze riportate in questa pubblicazione si trova nel documento Regulatory Compliance and Safety Information (Conformità alle norme e informazioni sulla sicurezza) che accompagna questo dispositivo.
Advarsel Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan føre til personskade. Før du utfører arbeid på utstyr, må du vare oppmerksom på de faremomentene som elektriske kretser innebærer, samt gjøre deg kjent med vanlig praksis når det gjelder å unngå ulykker. Hvis du vil se oversettelser av de advarslene som finnes i denne publikasjonen, kan du se i dokumentet Regulatory Compliance and Safety Information (Overholdelse av forskrifter og sikkerhetsinformasjon) som ble levert med denne enheten.
Aviso Este símbolo de aviso indica perigo. Encontra-se numa situação que lhe poderá causar danos físicos. Antes de começar a trabalhar com qualquer equipamento, familiarize-se com os perigos relacionados com circuitos eléctricos, e com quaisquer práticas comuns que possam prevenir possíveis acidentes. Para ver as traduções dos avisos que constam desta publicação, consulte o documento Regulatory Compliance and Safety Information (Informação de Segurança e Disposições Reguladoras) que acompanha este dispositivo.
¡Advertencia! Este símbolo de aviso significa peligro. Existe riesgo para su integridad física. Antes de manipular cualquier equipo, considerar los riesgos que entraña la corriente eléctrica y familiarizarse con los procedimientos estándar de prevención de accidentes. Para ver una traducción de las advertencias que aparecen en esta publicación, consultar el documento titulado Regulatory Compliance and Safety Information (Información sobre seguridad y conformidad con las disposiciones reglamentarias) que se acompaña con este dispositivo.
Varning! Denna varningssymbol signalerar fara. Du befinner dig i en situation som kan leda till personskada. Innan du utför arbete på någon utrustning måste du vara medveten om farorna med elkretsar och känna till vanligt förfarande för att förebygga skador. Se förklaringar av de varningar som förkommer i denna publikation i dokumentet Regulatory Compliance and Safety Information (Efterrättelse av föreskrifter och säkerhetsinformation), vilket medföljer denna anordning.
Follow these basic guidelines when working with any electrical equipment:
Electrostatic discharge (ESD) damages equipment and impairs electrical circuitry. ESD occurs when printed circuit boards are improperly handled and results in complete or intermittent failures.
The I/O controller, network processing engine, cable modem cards, and port adapters consist of a printed circuit board that is fixed in a metal carrier. Electromagnetic interference (EMI) shielding, connectors, and a handle are integral components of the carrier. Handle the I/O controller, network processing engine, cable modem cards, and port adapters by their carrier edges and handle only; never touch the printed circuit board components or connector pins.
Although the metal carrier helps to protect the printed circuit boards from ESD, wear a preventive antistatic strap whenever handling the network processing engine, I/O controller, cable modem cards, or port adapters. Ensure that the strap makes good skin contact and connect the strap's clip to an unpainted chassis surface to safely channel unwanted ESD voltages to ground. If no wrist strap is available, ground yourself by touching the unpainted metal part of the chassis
| Caution Make sure to tighten the captive installation screws on the network processing engine, cable modem cards, and the I/O controller (use a number 2 Phillips's screwdriver). These screws prevent accidental removal, provide proper grounding for the router, and help to ensure that the network processing engine, cable modem cards, and the I/O controller are properly seated in the router midplane. |
Following are guidelines for preventing ESD damage:
| Caution Periodically check the resistance value of the antistatic strap. The measurement should be within the range of 1 and 10 megohms. |
If your Cisco uBR7246 universal broadband router is installed in a standard 19-inch, 4-post or telco rack, cables from other equipment in the rack may obstruct access to the rear of the router. Also, rack power strips or other permanent fixtures may obstruct access to the router. Review the following guidelines to ensure easy access to the rear of the router when it is installed in a rack. If the router is not installed in a rack, or if you already have clear access to the rear of the router, proceed to the following section "Removing and Replacing an AC-Input Power Supply."
Use the following guidelines to ensure easy access to the rear of the router when it is installed in a rack:
| Caution Make sure that at least one other person is available to support the front of the router as you slide it out from the rack and, if necessary, to continue to support it while you remove and insert the power supply, network processing engine, or subchassis. |
The following sections explain how to remove and replace an AC-input power supply in a Cisco uBR7246 universal broadband router.
Removing and replacing the AC-input power supply in a single power supply configuration involves the following tasks:
These tasks are described in detail in the following subsections.
To power down a Cisco uBR7246 universal broadband router, complete the following steps:
Step 1 Facing the rear of the router, place the power switch (on the power supply) in the OFF (0) position. Repeat this action if a second power supply is installed in the router.
Step 2 Observe the following items:
To disconnect AC-input power to a Cisco uBR7246 universal broadband router, complete the following steps:
Step 1 Unplug the input power cable from the power source.
Step 2 Push the cable-retention clip that secures the input power cable to the router's power supply to the left.
Step 3 Unplug the other end of the input power cable from the power supply (refer to Figure 5).
This completes the procedure for powering down the router and disconnecting AC-input power. Proceed to the section "Removing the AC-Input Power Supply."
To remove an AC-input power supply from a Cisco uBR7246 universal broadband router, complete the following steps:
Step 1 Using a number 2 Phillips screwdriver, loosen the two captive screws on the faceplate of the power supply (refer to Figure 6).
If the router is not installed in a standard 4-post or telco rack, skip to Step 5. If the router is installed in a rack, determine if any permanent rack fixtures, such as a power strip, are obstructing access to the power supply. If a rack fixture is obstructing access to the power supply, proceed to Step 2.
Step 2 Using a 3/16-inch flat-blade screwdriver, loosen the screws that secure the router to the front mounting strips of the rack.
Step 3 Position at least one person in front of the rack to support the front underside of the router.
Step 4 From the rear of the rack, carefully push the front of the router out of the rack until there is enough clearance to remove the power supply.
Step 5 Grasp the power supply handle and pull the AC-input power supply from the router.
| To maintain agency compliance requirements and meet EMI emissions standards for the Cisco uBR7246 universal broadband routers with a single power supply, the power supply filler plate and its attached air dam must remain in the power supply adjacent to the installed power supply. Do not remove this filler plate or the attached air dam from the router unless you intend to install a redundant power supply. |
This completes the procedure for removing the AC-input power supply from a Cisco uBR7246 universal broadband router. Proceed to the following section "Installing the AC-Input Power Supply and Connecting AC-Input Power."
To replace the AC-input power supply in a Cisco uBR7246 chassis, complete the following steps:
Step 1 Make sure the power switch on the power supply is in the OFF (0) position.
Step 2 Grasp the power supply handle with one hand and place your other hand underneath the power supply for support (refer to Figure 7).
Step 3 Align the power supply to the power supply bay.
Step 4 Slide the power supply completely in to the power supply bay until its faceplate is flush with the router's rear panel.
| Caution When inserting a power supply into the router, do not use unnecessary force; slamming the power supply into the bay can damage the connectors on the rear of the supply and on the midplane. |
Step 5 Seat the power supply in the router by tightening the captive screws with a number 2 Phillips screwdriver.
Step 6 If there is no second power supply, replace the filler plate and its attached air dam on the empty power supply bay. Using a number 2 Phillips screwdriver, tighten the filler plate's captive screws.
Step 7 If you pushed the router from the rack, slowly guide the router back into the rack.
Step 8 Use a 3/16-inch flat-blade screwdriver to tighten the screws that secure the router to front mounting strips of the rack.
| Caution To maintain agency compliance requirements and meet EMI emissions standards for the Cisco uBR7246 universal broadband routers with a single power supply, the power supply filler plate and its attached air dam must remain in the power supply adjacent to the installed power supply. Do not remove this filler plate or the air dam from the router unless you intend to install a redundant power supply. |
This completes the procedures for replacing a power supply in the router. Proceed to the following section "Reconnecting Input Power and Powering Up the Router."
The following procedures explain how to reconnect AC-input power to a Cisco uBR7246 universal broadband router, power up the router, and verify a successful system boot.
To reconnect AC-input power to a Cisco uBR7246 universal broadband router, complete the following steps:
Step 1 At the rear of the router, check that the power switch on the power supply is in the OFF (0) position.
Step 2 Push the cable-retention clip to the left, away from the AC receptacle, and plug in the power cable.
Step 3 Secure the cable in the power supply AC receptacle by pushing the cable-retention clip to the right until it snaps around the connector. The cable-retention clip provides strain relief for the AC power cable (refer to Figure 8).
Step 4 Plug the AC power supply cable into the AC power source.
This completes the steps for connecting AC-input power to a Cisco uBR7246 universal broadband router.
To power up a Cisco uBR7246 universal broadband router that has an installed AC-input power supply, complete the following steps:
Step 1 Check for the following:
Step 2 At the rear of the router, place the power switch on the power supply in the ON (|) position. Repeat this step if a second power supply is installed in the router. The green OK LED on the power supply turns on.
Step 3 Listen for the fans; you should immediately hear them operating.
Step 4 During the boot process, observe the system's LEDs. The LEDs on most of the port adapters and cable modem cards go on and off in irregular sequence. Some may go on, go out, and go on again for a short time. On the I/O controller, the IO Power OK LED comes on immediately.
Step 5 Observe the initialization process. When the system boot is complete (after a few seconds), the network processing engine begins to initialize the port adapters and the I/O controller. During this initialization, the LEDs on each port adapter behave differently (most flash on and off). The enabled LED on each port adapter goes on when initialization is completed, and the console screen displays a script and system banner similar to the following:
This completes the procedures for connecting input power and powering up the router. This also completes the procedure for replacing the AC-input power supply in a single Cisco uBR7246 power supply configuration.
Removing and replacing an AC-input power supply in a dual power supply configuration involves the following tasks:
These tasks are described in detail in the following subsections.
To turn off the AC-input power supply you plane to replace, complete the following steps:
Step 1 Facing the rear of the router, place the power switch (on the power supply) in the OFF (0) position.
Step 2 Observe the following items:
To disconnect AC input power to the power supply, complete the following steps:
Step 1 Unplug the input power cable from the power source.
Step 2 Push the cable-retention clip that secures the input power cable to the router's power supply to the left.
Step 3 Unplug the other end of the input power cable from the power supply.
This completes the procedure for turning off the power supply and disconnecting AC input power. Proceed to the section "Removing the AC-Input Power Supply."
Complete the following steps to remove an AC-input power supply from a Cisco uBR7246 universal broadband router:
Step 1 Using a number 2 Phillips screwdriver, loosen the two captive screws on the faceplate of the power supply (refer to Figure 6).
If the router is not installed in a standard 4-post or telco rack, skip to Step 5. If the router is installed in a rack, determine if any permanent rack fixtures, such as a power strip, are obstructing access to the power supply. If a rack fixture is obstructing access to the power supply, proceed with Step 2.
Step 2 Use a 3/16-inch flat-blade screwdriver to loosen the screws that secure the router to the front mounting strips of the rack.
Step 3 Position at least one person in front of the rack to support the front underside of the router.
Step 4 From the rear of the rack, carefully push the front of the router out of the rack until there is enough clearance to remove the power supply from the router.
Step 5 Grasp the power supply handle and pull the AC-input power supply from the router.
This completes the procedure for removing the AC-input power supply from a Cisco uBR7246 universal broadband router. Proceed to the following section "Installing the AC-Input Power Supply and Connecting AC-Input Power."
To install an AC-input power supply in a Cisco uBR7246 universal broadband router, complete the following steps:
Step 1 Make sure the power switch on the power supply is in the OFF (0) position.
Step 2 Grasp the power supply handle with one hand and place your other hand underneath the power supply for support (refer to Figure 7).
Step 3 Align the power supply to the power supply bay.
Step 4 Slide the power supply completely in to the power supply bay until its faceplate is flush with the router's rear panel.
| When inserting a power supply into the router, do not use unnecessary force; slamming the power supply into the bay can damage the connectors on the rear of the supply and on the midplane. |
Step 5 Seat the power supply in the router by tightening its captive screws with a number 2 Phillips screwdriver.
Step 6 If you pushed the router forward in the rack, slowly guide the router back into the rack.
Step 7 Use a 3/16-inch flat-blade screwdriver to tighten the screws that secure the router to front mounting strips of the rack.
This completes the procedures for replacing a power supply in the router. Proceed to the following section "Reconnecting Input Power and Turning On the Power Supply."
The following procedures explain how to reconnect AC-input power to a Cisco uBR7246 universal broadband router, turn on power supply, and verify the power supply is operating properly.
To reconnect AC-input power to a Cisco uBR7246 universal broadband router, complete the following steps:
Step 1 At the rear of the router, check that the power switch on the power supply is in the OFF (0) position.
Step 2 Push the cable-retention clip to the left, away from the AC receptacle, and plug in the power cable.
Step 3 Secure the cable in the power supply AC receptacle by pushing the cable-retention clip to the right until it snaps around the connector. The cable-retention clip provides strain relief for the AC power cable (refer to Figure 9).
Step 4 Plug the AC power supply cable into the AC power source.
Step 5 Repeat Step 1 through Step 4 if a second power supply is installed.
This completes the steps for reconnecting AC-input power to a Cisco uBR7246 universal broadband router.
To turn on the power supply, complete the following steps:
Step 1 Place the power switch on the newly installed power supply in the ON (|) position.
Step 2 Observe the following:
This completes the procedures for reconnecting input power and turning on the power supply. This also completes the procedure for removing and replacing the AC-input power supply in a Cisco uBR7246 universal broadband router.
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