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Product Number: MAS-UBR7200-FAN=
This document explains how to remove and replace the fan tray in the Cisco uBR7246 universal broadband router. It includes instructions for removing the fan tray from the subchassis and installing a new fan tray in the subchassis.
This document includes the following sections:
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 router, the following documentation resources are available:
The Cisco uBR7246 universal broadband router 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 the 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 online insertion and removal (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 2). 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 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 universal broadband router comes equipped with one 550W AC-input power supply. A fully configured Cisco uBR7246 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 grounding receptacles that provide a chassis ground connection for ESD equipment or a two-hole grounding lug.
Seven internal fans draw cooling air into the chassis and across internal components to maintain an acceptable operating temperature. (Refer to Figure 1.) 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 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.
The fan tray, shown in Figure 4, consists of seven fans enclosed in a metal tray. The fan tray is located in the subchassis on the left side of the Cisco uBR7246 universal broadband router when viewing the router from the front (refer to Figure 1). The fan tray receives DC-input power through a power connector that connects to the router midplane.
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 [the port adapter and cable modem card end]), and moves the air across the internal components and out the exhaust vent on the left side of the chassis. Figure 5 shows the air flow through the Cisco uBR7246 universal broadband router.
The right and left sides of the router must remain unobstructed to ensure adequate airflow and to prevent overheating inside the router. Maintain at least three inches of clearance on both sides of the router.
Following are safety guidelines that you should follow when working with any equipment that connects to electrical power or telephone wiring.
 | 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:
Removing and replacing the fan tray in a Cisco uBR7246 universal broadband router involves the following tasks:
These tasks are described in detail in the following subsections.
To remove the fan tray from the subchassis, complete the following steps:
Step 1 Using a number 2 Phillips screwdriver, or your fingers, loosen the captive installation screw that secures the fan tray to the subchassis (refer to Figure 6).
Step 2 Grasp the fan tray handle with one hand and the outside of the chassis with the other hand
| Caution The fans are exposed on the left side of the fan tray. Keep your fingers, clothing, and jewelry away from the fans. Always handle the fan tray by the handle. |
Step 3 Pull the fan tray backward toward you to disengage it from the power connector in the subchassis (refer to Figure 7).
This completes the steps for removing the fan tray from the subchassis.
Proceed to the following section "Installing a New Fan Tray in the Subchassis."
To install a new fan tray in the subchassis, complete the following steps:
Step 1 Orient the fan tray so the fans face the outside of the chassis and the fan tray handle is at the top of the fan tray front panel (refer to Figure 7).
Step 2 Guide the fan tray into the subchassis making sure the DC power connector on the fan tray is aligned with the receptacle in the subchassis.
| Caution The fans are exposed on the left side of the fan tray. Keep your fingers, clothing, and jewelry away from the fans. Always handle the fan tray by the handle. |
Step 3 Secure the fan tray to the subchassis using the attached captive installation screw (refer to Figure 6).
This completes the procedure for removing or replacing the fan tray in a Cisco uBR7246 universal broadband router.
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