Dial Shelf Blower Assembly

The blower assembly in the Cisco 5814 dial shelf monitors the dial shelf internal operating temperatures and maintains acceptable cooling parameters. The blower assembly contains three variable-speed impeller fans and a controller card that performs the following functions:

•Monitors internal temperatures

The controller card contains temperature sensors, which monitor internal air temperature within the dial shelf chassis. These temperature sensors, along with other system maintenance sensors, can detect areas exceeding the temperature set point.

•Controls fan operation

Fan speed is controlled by a microprocessor on the controller card. If air temperature within the dial shelf chassis exceeds the acceptable operating range, the controller card increases the fan speed in an attempt to control the temperature. If temperatures continue to rise, the controller card linearly increases fan speed until the fans reach full speed. If acceptable operating temperatures are still unobtainable, the system environmental monitor shuts down all internal power, thus preventing equipment damage from excessive heat.

During normal operation, the three fans “load-share” to provide cooling. If one of the three fans fails, a warning message displays on your console screen. The controller card then increases the speed of the remaining operative fans to maintain acceptable temperature levels.

When all three fans are operating normally, fan speed is 1,600 rpm. As ambient air temperature increases, fan speed increases accordingly. Thus, if one of the fans becomes inoperative, the remaining fans increase fan speed to 2,400 rpm.

•Supports OIR

The blower assembly supports OIR, which means you can remove and replace the blower assembly while the system is operating; system operation will not be affected. However, if you expect the replacement process to exceed 1 min, we recommend that you shut down the system. Normal blower assembly replacement is estimated not to exceed 30 sec.

The blower assembly is located directly above the dial shelf cards and dial shelf controller cards in the dial shelf. You install the blower assembly into the front of the dial shelf chassis where it plugs directly into the dial shelf backplane. Figure 1-14shows the location of the blower assembly in a fully configured Cisco 5814 dial shelf, as viewed from the front of the system.

For detailed specification tables, refer to Appendix A, “Cisco AS5800 Specifications.”

Cisco AS5800 Product Overview 1-15

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.

Cisco Systems AS5800 manual Dial Shelf Blower Assembly

Models: AS5800