Chapter

Frame Relay Service Modules (FRSMs)

An application of a BSTUN connection is shown in Figure 4-6.A Bisync device, such as an IBM 3270, is connected to a FRASM port using Bisync protocol. The traffic is first converted to Frame Relay and then to ATM cells for transmission over the network. At the other end, the traffic is first converted back to Frame Relay and the Bisync traffic is then extracted for transmission to a front end communication processor and then to the IBM mainframe.

Figure 4-6 Using FRASM for a BSTUN Connection

Remote Bisynch Bisynch End User Device

FRASM

MGX 8220

ATM network

Frame Relay

over ATM

MGX 8220

FRASM

Bisynch

Front-end

Processor

NCP1

Mainframe

VTAM1

11761

Using BSTUN, FRASM supports

•Point-to-point Bisync lines.

•Multidropped Bisync devices over a single logical port. These can be assigned to different connections.

•Multiple logical connections over a single logical port.

•Virtual multidrop in which Bisync devices attached to a FRAM on a different MGX 8220 shelf can be configured to appear on multidropped devices on a single multidrop line.

FRAS Connections

FRAS BNN, short for Frame Relay Boundary Network Node, is a technique for encapsulating SDLC/SNA traffic into Frame Relay frames (to RFC 1490) at one end of the connection only. At the other end of the connection, the data is presented as Frame Relay. This is used for connecting an SDLC device at one end to a Frame Relay device at the other.

SNA traffic received by the FRASM is converted first to a Frame Relay format and is then further converted into cells for transmission over an ATM network, the ATM traffic is then converted back to Frame Relay at the other end.

Using FRASM configured for FRAS BNN connections, many low speed SNA lines can be consolidated into a smaller number of high-speed lines for fast transport through the network. In addition, FRAS BNN can be used for high-speed links between IBM front end processors (FEPs). FEPs running under Network Control Program (NCP) 7.1 support BNN.

An application of a FRAS BNN connection is shown in Figure 4-7.An SDLC device is connected to an FRASM port using SDLC protocol. The traffic is first converted to Frame Relay and then to ATM cells for transmission over the network. At the other end, the traffic is first converted back to Frame Relay for transmission to a front-end communication processor and then to the IBM mainframe.

 

 

Cisco MGX 8220 Installation and Configuration

 

 

 

 

 

 

 

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

 

 

4-13

 

 

 

 

 

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Cisco Systems MGX 8220 manual Fras Connections, Using Frasm for a Bstun Connection
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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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