Chapter

Core Module Overview

SRM-T1/E1 LED Indicators

All LEDs are located on the faceplate of the front card. The SRM-T1/E1 LED indicators are described in Table 2-4.

Table 2-4 SRM-T1/E1 LED Indicators

Type of LED

Color

Meaning

 

 

 

ACT

Green

On indicates the card set is in active mode.

 

 

 

STBY

Yellow

On indicates the card set is in standby mode.

 

 

 

FAIL

Red

On indicates the BNM-155 card set has failed or the line module

 

 

is missing.

 

 

 

1:N RED

Green

On indicates 1:N redundancy has been invoked.

 

 

Off indicates 1:N redundancy is not active.

 

 

 

BERT

Green

On indicates the BERT function is active.

 

 

 

AX-SRM-3T3

The SRM-3T3 service redundancy module provides bulk distribution of T1 circuits to the 4-port or

8-port T1 service modules. Rather than individually cable each of the 40 or 80 incoming T1/E1 lines to an MGX 8220 edge concentrator, the MGX 8220 backplane is designed with a distribution bus that allows an AX-SRM-3T3 to distribute T1s received “in bulk” to T1-based service modules. This eliminates the need for T1 back cards for each service module and the associated cabling and potential overloading of the digital cross-connect system port. The AX-SRM-3T3 provides a method to bring in from one to three T3 interfaces that can be demultiplexed to their constituent T1s, providing up to 28, 56, or 80 T1s to be distributed to T1 service modules over the distribution bus. Both 4-port and 8-port service modules are supported in any combination. The AX-SRM-3T3 supports the following features:

1:1 redundancy of the SRM with Y-cabling.

The same features as the AX-SRM-T1E1, including bit rate error test (BERT) and 1:N redundancy of T1/E1 service modules.

Spare service module that can be used to provide redundancy for both bulk-distributed and line-module-based service modules concurrently (a redundancy back card will be required for a spare service module providing redundancy for line module-based service modules).

No back card required for T1 service modules that use bulk distribution.

Mix of service modules using bulk distribution with service modules using line modules in the same shelf.

Mix of 4-port and 8-port cards, with all 10 slots always available to service modules via either line modules or bulk.

Out of the maximum possible 84 T1 channels (3 times 28), up to 80 channels can be active at any time. Any T1 channel in a T3 line can be distributed to any four/eight port on a service module in any slots 5 to 14 without restriction.

The AX-SRM-3T3 can also be operated in “nonbulk mode” on a port-by-port basis. For a port configured in nonbulk mode, bulk distribution is disabled and the SRM acts as a AX-SRM-T1/E1 providing BERT and 1:N redundancy functions only.

Figure 2-18shows an illustration of the AX-SRM-3T3 cards.

 

Cisco MGX 8220 Installation and Configuration

2-24

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

Page 66
Image 66
Cisco Systems MGX 8220 manual SRM-T1/E1 LED Indicators, 1N RED, Bert

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.