Chapter

Circuit Emulation Service Modules

Circuit Emulation Service Module (8-port)

The 8-port Circuit Emulation Service Module (CESM) is a two-card set consisting of an CESM function module front card and either a 8-T1 or a 8-E1 line module back card. T1 lines use RJ48 connectors, E1 line module cards use either RJ48 or SMB connector types. The possible line modules are

•AX-RJ48-8T1-LM

•AX-R-RJ48-8T1-LM

•AX-RJ48-8E1-LM

•AX-R-RJ48-8E1-LM

•AX-SMB-8E1-LM

•AX-R-SMB-8E1-LM

Up to 10 CESMs may be installed in a shelf in slots 5 through 14. For T1 line versions, 1:N redundancy is supported either through redundant line modules or through the SRM-T1E1 board. Likewise, for T1/E1 versions, BERT and loopbacks are supported using the SRM.

A 1:N redundancy for E1 version is provided through redundant line modules only.

The main function of the CESM cards is to provide a constant bit rate (CBR) service for T1/E1 ports over ATM network.

The CESM converts DS1/E1 or data streams into CBR AAL1 cells for transport across the ATM network. The T1/E1 versions support a choice of structured or unstructured data transfer on a per-physical-interface basis.

The CESM card supports loopback diagnostics features through the addlnloop command.

Note The addchanloop command is not supported in the 8-port CESM.

Refer to the Cisco MGX 8220 Command Reference for details of these commands.

T1/E1 Structured Data Transfer

The T1/E1 structured data transfer mode supports

•Synchronous timing only.

•A nx64 Kbps Fractional DS1/E1 service with contiguous time slots. Any nx64 kbps channel can be mapped to any VC. Both SF and ESF framing modes are supported.

•For AAL1 interworking conversion only, CAS robbed bit for T1 (ABCD for ESF and SF frames) and CAS for E1 (Channel 16).

•CCS channel transparently as data.

•Choice of partially filled cells.

•Idle Suppression/Detection for 1x64 CAS connections only.

T1/E1 Unstructured Data Transfer

The T1/E1 unstructured data transfer mode supports:

•Both synchronous and asynchronous clocking.

 

 

Cisco MGX 8220 Installation and Configuration

 

 

 

 

 

 

 

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

 

 

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Cisco Systems MGX 8220 manual Circuit Emulation Service Module 8-port, T1/E1 Structured Data Transfer
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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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