Chapter

Core Module Overview

IMATM

The inverse multiplexing for ATM trunk module (IMATM) is housed in the Cisco MGX 8220 shelf in a service module slot. IMATM is an extension to the Cisco BPX 8600 series BNI card that supports Cisco BPX 8600 series ATM trunks over multiple (up to 8) T1 and E1 lines instead of single T3 or E3 line. The IMATM does not use the Cisco MGX 8220 cell bus as other service modules do, but provides its own trunk to the Cisco BPX 8600 series.

Service Resource Modules

Aservice redundancy module (AX-SRM-T1/E1) provides three major functions for service modules: bit error rate testing (BERT) of T1 and E1 lines and ports, loop back of individual nx64 channels toward the CPE, and 1:N redundancy. The AX-SRM-3T3 also provides bulk distribution of T1 lines. This section described the following:

•AX-SRM-T1/E1 Features, page 2-22

•Rules for Installation of SRMs, page 2-23

•AX-SRM-3T3, page 2-24

Figure 2-17shows an illustration of the AX-SRM-T1/E1 card.

AX-SRM-T1/E1 Features

The SRM cards provide the following functions:

•Bit error rate testing (BERT)

When a service module line or port has been put into loopback mode, the SRM can generate a test pattern over the looped line or port, read the received looped data, and report on the error rate. This operation can be performed on a complete T1 or E1 line, on a fractional T1 or E1 line, on a DS0 bundle (NxDS0), or on a single DS0 channel. The SRM can support BERT only one line or channel at a time.

BERT is capable of generating a variety of test patterns including all ones, all zeros, alternate one zero, double alternate one zero, 223-1, 220-1, 215-1, 211-1, 29-1, 1 in 8, 1 in 24, DDS1, DDS2, DDS3, DDS4, and DDS5.

•Extended loopback code-generation capabilities for individual DS-1 or subrate streams

•1:N service module redundancy

Service module redundancy provides 1:N redundancy for multiple groups of service modules where a group can consist of N active and one standby service modules. The redundant service module in a group must be a superset (with respect to functionality) of the cards. For example, one group could contain all the FRSMs and another all the AUSMs.

1:N redundancy must be configured by the user. When the failure of an active card in a group is detected by the ASC, the SRM is ordered to invoke 1:N redundancy for that group. The back card of the failed service module now directs data to and from the standby service module. With the SRM-T1/E1, when 1:N redundancy is invoked for a group, it is not available to the other groups or to other service modules in the group using 1:N redundancy. Another failure in any group results in a shelf alarm. This restriction does not apply to the SRM-3T3, for example, the SRM-3T3 can support multiple group failures.

 

Cisco MGX 8220 Installation and Configuration

2-22

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

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Cisco Systems MGX 8220 manual Service Resource Modules, AX-SRM-T1/E1 Features
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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.
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