Cooling Assembly

Chapter

Cooling Assembly

DC Power Drain and Circuit Protection

Each card in an Cisco MGX 8220 shelf draws an average of 21W with a worst-case shelf current of 14.40A.

The circuit breaker in the DC power entry module (PEM) is rated at 15.00A.

The Cisco MGX 8220 circuits are protected as follows:

•Backplane has a 5A fast-blow fuse for each slot position.

•Each board has a 1.5A circuit breaker in the -48V DC line to the DC/DC converter.

Each Cisco MGX 8220 board is equipped with a DC/DC converter (Shindengen—HGG05006 or AT&T—JW030A), which has an automatic current limited to 5V output.

A schematic of the DC power system is shown in Figure 2-6.

Figure 2-6 DC Power System

Battery

power

		B		Conductive edge
		B
-48V	-48V	A
-48V	-48V	C	-48V	DC/DC
RTN	RTN	K	RTN	DC/DC
RTN	RTN	P	RTN	converter
PEM		P		converter
		L
Safety		A
Safety		N		Circuit board
ground		N		Circuit board
		E		H8248
				H8248

Earth ground

Safety ground

This section describes the cooling assembly that cools the Cisco MGX 8220 shelf and equipment:

•Main Cooling Assembly, page 2-7

•Booster Cooling Assembly, page 2-8

•Plenum Exhaust Chamber, page 2-8

•Spacer Unit, page 2-8

•Cooling Assembly Power, page 2-8

The main cooling unit houses the fans that circulate air through the shelf. This unit is mounted below the shelves. This unit is capable of cooling up to two Cisco MGX 8220 shelves in the same rack. Racks that contain more than two shelves require a booster unit to provide additional cooling. The cooling assembly is powered from the main shelf.

The plenum or a spacer unit is mounted above the shelves to exhaust the warm air.

A single Cisco MGX 8220 shelf is shown in Figure 2-7.For more information on rack assembly and configuration, see Chapter 7, “Installation and Start-Up.”

	Cisco MGX 8220 Installation and Configuration
2-6	Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003

MGX 8220 specifications

The Cisco Systems MGX 8220 is a versatile, high-performance media gateway that has become an integral component in the telecommunications infrastructure. Designed to facilitate the transition from traditional circuit-switched networks to advanced packet-switched environments, the MGX 8220 supports a wide array of voice, video, and data services, making it an essential tool for service providers and enterprises seeking to enhance their network capabilities.

One of the key features of the MGX 8220 is its robust signaling and media processing capabilities. Equipped with support for both Voice over IP (VoIP) and traditional telephony protocols, this gateway enables seamless integration of different communication formats. It boasts a modular architecture, which allows for the addition or removal of various line cards to meet changing demands and technology advancements. This modularity provides operators with the flexibility to scale their services without significant overhauls to their existing infrastructure.

The MGX 8220 is capable of delivering high-density media handling for a multitude of services. With its support for ATM and IP networks, the gateway can handle TDM (Time-Division Multiplexing) to packet voice conversions efficiently. It is designed to optimize network resources by dynamically allocating bandwidth based on traffic requirements, thus ensuring efficient use of network resources and improved performance.

Another significant characteristic of the MGX 8220 is its enhanced quality of service (QoS) features. This capability ensures that voice and video traffic is prioritized appropriately, minimizing latency and jitter while maximizing overall call quality. By employing sophisticated traffic management techniques, the MGX 8220 can deliver a superior user experience, which is critical for any service provider aiming to offer competitive communication solutions.

Furthermore, the gateway includes built-in security features to protect against unauthorized access and ensure the integrity of sensitive data. This includes encryption for voice and video transmission, as well as support for secure signaling protocols.

Overall, the Cisco Systems MGX 8220 stands out as a comprehensive media gateway solution, providing essential functionalities for modern communication needs. Its combination of modularity, high-density processing, effective QoS management, and security features makes it a compelling choice for organizations looking to modernize their telecommunications infrastructure while ensuring reliability and performance. As businesses continue to evolve and demand more from their networks, the MGX 8220 offers a pathway to future-ready communications.

Cisco Systems MGX 8220 manual Cooling Assembly, DC Power Drain and Circuit Protection

Models: MGX 8220

DC Power Drain and Circuit Protection

Figure 2-6 DC Power System

Cooling Assembly

Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003

MGX 8220 specifications