ATM Trunk Interface Back Card

Chapter

Core Module Overview

The major function of the BNM-155 is to provide a 155 Mbps SONET ATM interface to a BXM-8-155 port or a BXM-4-155 port in a Cisco BPX 8600 series node. The BNM-155 also provides the following miscellaneous functions:

•Shelf mastership

This function selects which core card to use as the master and which redundant bus to use.

•Cell bus mastership

BNM-155 polls the other cards on the bus and grants permission to transmit cells across the bus. Polling is performed on a round-robin basis.

•Clock selection

BNM-155 manages the clock selection and synchronization for the entire Cisco MGX 8220 shelf. The BNM-155 selects, regulates, and outputs the selected clock for use by each service module in the shelf. The BNM-155 back card contains a T1/E1 port for inputting an external T1/E1 clock source (both D-15 and BNC are available). The shelf can also obtain its clock source from the SONET trunk itself or use an internal clock source.

•External Alarm Interface

BNM-155 provides the activation of four alarm relays that are wired to a DB-15 connector on the back card faceplate, allowing the customer to wire their own cable from the connector to an indicator panel. The four relays are Major Alarm Audible, Major Alarm Visual, Minor Alarm Audible, and Minor Alarm Visual. The pinouts for this connector are provided in Appendix B, “Specifications.”

•Miscellaneous monitoring functions

–Fan performance in the cooling assembly

–Input voltage levels

–Shelf intake air temperature

–In-band management

The BNM-155 provides a separate path for management of the Cisco MGX 8220 shelf using an ATM VCC from across the ATM network.

The BNM-155 card accepts and transmits ATM 53-byte cells over a SONET line interface at 155.52 Mbps using ATM UNI or ATM B-ICI protocols.

In UNI mode, 20 virtual circuit connections per slot are supported.

In NNI mode, 340 virtual circuit connections per slot are supported.

SMF-155 Back Card

The SMF-155 back card provides a physical single-mode fiber optic SONET OC-3 interface conforming to ANSI T1.105 and GR-253-CORE standards. This interface uses SC connectors. When used in a redundant configuration, redundant cabling is provided through Y-cables.

The back card also provides

•One-DB-15 female connector for T1/E1 clock input

•One-BNC connector for E1 clock input

•One-DB-15 female connector for alarm interface

	Cisco MGX 8220 Installation and Configuration
2-20	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 ATM Trunk Interface Back Card, SMF-155 Back Card

Models: MGX 8220