HP FlexFabric 7904 Fan Trays (JG839A & JG684A) User Guide 5998-4301 Part number: 5998-4301 Document version: APW100-20130830
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Contents Fan tray overview ···················································································· 1 Back-to-front airflow fan tray ····························································· 1 Introduction ····················································································1 Back-to-front airflow fan tray specifications ································ 2 Front-to-back airflow fan tray ···························································· 3 Introduction ················
Fan tray overview Back-to-front airflow fan tray Introduction The HP FlexFabric 7904 back (power side) to front (port side) airflow Fan Tray (JG839A) provides powerful cooling and heat dissipation for the switch. It blows cool air into the switch from the power side to the port side. The fan tray has five fans and features small size, fast heat dissipation, and hot swapping. It can automatically adjust the fan speed based on the switch temperature.
(2) Handle (The handle is in blue, indicating that the fan tray blows cool air into the switch from the power side to the port side.) (3) This side up sign (4) Air flow sign The switch provides a LED on the power side panel for each fan tray to indicate the fan tray operating status. When the switch is running, the LED can have the following states: • Green—The fan tray is operating correctly. • Red—No fan tray is installed or the fan tray is faulty.
Front-to-back airflow fan tray Introduction The HP FlexFabric 7904 front (port side) to back (power side) airflow Fan Tray (JG684A) provides powerful cooling and heat dissipation for the switch. It blows exhaust air out of the switch from the port side to the power side. The fan tray has five fans and features small size, fast heat dissipation, and hot swapping. It can automatically adjust the fan speed based on the switch temperature.
(3) Air flow sign (4) This side up sign The switch provides a LED on the power side panel for each fan tray to indicate the operating status of the fan tray. When the switch is running, the LED can have the following states: • Green—The fan tray is operating correctly. • Red—No fan tray is installed or the fan tray is faulty. Front-to-back airflow fan tray specifications Table 2 Front-to-back airflow fan tray specifications Item Specification Number of fans Five 40 × 40 × 56 mm (1.57 × 1.57 × 2.
Installing and replacing a fan tray IMPORTANT: Before you install a fan tray, • Make sure the air flow direction of the fan tray is as required. • Make sure you install two fan trays of the same model for the switch. The installation and removal procedures for the back-to-front airflow fan tray and front-to-back airflow fan tray are similar. Installing a fan tray 1. Wear an ESD wrist strap, and make sure it makes good skin contact and is correctly grounded. 2.
6. Use a Phillips screwdriver to tighten the captive screws on the fan tray to make sure the fan tray is fully seated in the slot. 7. Verify the fan tray installation by examining the fan tray LED on the power side. { { If the LED is steady green, the installation is correct. If the LED is in red, the fan tray is faulty. Remove and re-install the fan tray. If the problem persists, contact HP Support.
Figure 3 Installing a fan tray 1 2 3 NOTE: • If you insert the fan tray with the upside down, you cannot completely insert it into the slot. If this happens, pull the fan tray out and then insert it again with the upside up. • If the captive screws cannot be attached tightly, check for the installation of the fan tray.
Replacing a fan tray CAUTION: • When you replace a fan tray from a running switch, be cautious of electricity hazards, and do not touch the rotating fan to avoid bodily injury. • If a fan tray fails, finish replacing the fan tray within 5 minutes. If both fan trays fail, finish replacing the fan trays within 3 minutes to avoid switch damage. IMPORTANT: Make sure the new fan tray is the same model as the one to be replaced. To replace a fan tray: 1. Prepare an antistatic bag for the removed fan tray. 2.
Figure 4 Removing a fan tray 9
Support and other resources Contacting HP For worldwide technical support information, see the HP support website: http://www.hp.
Related information Documents To find related documents, browse to the Manuals page of the HP Business Support Center website: http://www.hp.com/support/manuals • For related documentation, navigate to the Networking section, and select a networking category. • For a complete list of acronyms and their definitions, see HP FlexNetwork Technology Acronyms. Websites • HP.com http://www.hp.com • HP Networking http://www.hp.com/go/networking • HP manuals http://www.hp.
Command conventions Convention Description Boldface Bold text represents commands and keywords that you enter literally as shown. Italic Italic text represents arguments that you replace with actual values. [] Square brackets enclose syntax choices (keywords or arguments) that are optional. { x | y | ... } Braces enclose a set of required syntax choices separated by vertical bars, from which you select one. [ x | y | ...
GUI conventions Convention Description Boldface Window names, button names, field names, and menu items are in bold text. For example, the New User window appears; click OK. > Multi-level menus are separated by angle brackets. For example, File > Create > Folder. Symbols Convention Description WARNING An alert that calls attention to important information that if not understood or followed can result in personal injury.
Network topology icons Represents a generic network device, such as a router, switch, or firewall. Represents a routing-capable device, such as a router or Layer 3 switch. Represents a generic switch, such as a Layer 2 or Layer 3 switch, or a router that supports Layer 2 forwarding and other Layer 2 features. Represents an access controller, a unified wired-WLAN module, or the switching engine on a unified wired-WLAN switch. Represents an access point.
