Troubleshooting the Cooling Subsystems

—Verify that the overtemperature LED is off.

If a power supply overtemperature LED lights, verify that the ambient temperature is below 120°F (50°C) and the air intake is not blocked. If the condition persists, replace the power supply.

—Verify that the current limit LED is off.

If a power supply current limit LED lights, verify that the DC bus terminals on the AC-input power shelf rear are not short-circuited and a supported dial shelf configuration is being used.

Note The dial shelf power subsystem supports a maximum configuration of 10 modem cards.

Troubleshooting the Cooling Subsystems

The Cisco AS5800 is designed to minimize problems in the cooling subsystem. The access server can operate in temperatures of up to 120°F (50°C) for a maximum of 72 hours. The access server also contains rendundant fans in both the router shelf fan tray and the dial shelf blower assembly, which allow the system to continue operating despite a single fan failure. Both the router shelf fan tray and the dial shelf blower assembly can be removed and replaced while the system is operating, provided the procedure does not exceed 1 min.

Router Shelf Cooling Subsystem

In the router shelf, check the following to help isolate a problem with the cooling subsystem:

•When you start up the system, do the router shelf fans operate?

To determine whether the router shelf fans are operating, listen for them. In noisy environments, place your hand on the left side of the router shelf (when viewing the router shelf from the front) to feel for air being forced out the vents.

—If yes, power to the fans is good.

—If no, there is a problem with the router shelf fans or there is a problem with the power to the fan tray.

If you determine that the power supply is functioning normally but a fan is faulty, you can replace the fan tray without powering off the access server. Contact a customer service representative if you need assistance.

For problems with the system power, refer to the section “Troubleshooting the Power Subsystem” in this chapter.

Hardware Troubleshooting 5-9

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Cisco Systems AS5800 manual Troubleshooting the Cooling Subsystems, Router Shelf Cooling Subsystem
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AS5800 specifications

Cisco Systems has long been a leader in the networking and telecommunications field, and its AS5800 series of routers exemplify this tradition. The AS5800, along with the AS5850, AS5350, AS5400, and AS5300, provides robust solutions for service providers and enterprise-level networking applications. Each of these models has distinct features and characteristics that cater to the evolving demands of internet traffic and data processing.

The Cisco AS5800 is designed for high-capacity routing and optimized for broadband services. It supports a wide range of services, including voice, data, and video applications, making it a versatile option for service providers looking to deliver integrated solutions. It is equipped with advanced quality of service (QoS) features that ensure bandwidth is allocated effectively, holding strong even under heavy traffic conditions.

In comparison, the AS5850 offers superior processing capabilities and is typically utilized in larger-scale implementations. This model supports high-density interfaces, allowing numerous connections without compromising performance. Its architecture includes enhanced MPLS (Multiprotocol Label Switching) support, enabling more efficient traffic management and better utilization of network resources.

The AS5350 is known for its scalability and energy efficiency, ideal for voice-over-IP (VoIP) and media gateway applications. It supports various telephony features, such as protocol interworking and transcoding, making it a preferred choice for organizations focusing on digital voice technologies. The AS5300, while slightly older, continues to be a valuable asset for less demanding networks, offering reliable performance with VoIP capabilities and basic data applications.

The AS5400 bridges the gap between high-performance routing and operational efficiency. It incorporates Cisco's proprietary technologies to ensure seamless connectivity and robust failover systems. This model is highly regarded for its security features, protecting network integrity and providing peace of mind for businesses relying on sensitive data transfer.

Overall, Cisco’s AS5800 series showcases a progressive evolution of routing capabilities with enhanced features tailored for resilience, scalability, and performance. These routers not only address the technical needs of modern networks but also strategically position organizations for future growth in an increasingly digital world. Each model, with its unique attributes, continues to support the varied demands of global communication infrastructures.
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