Chapter

Frame Relay Service Modules (FRSMs)

ATM-to-FUNI Direction

If the EFCI field in the last ATM cell of a received segmented frame is set to 1, the CN bit in the FUNI header is set to 1. The two reserve bits (the same positions as C/R and BECN in Frame Relay header) are always set to 0.

FRSMs for T1 and E1 lines

There are two types of FRSM modules for T1 and E1 lines—Franctional (unchannelized) modules and channelized modules. Both these module types offer 1:N redundancy via the optional SRM (see Service Resource Modules, page 2-22).

Fractional FRSMs

Each interface of a fractional FRSM supports a single port at 56 kbps or nx64 kbps.

Each port can be independently configured to run Frame Relay UNI (FR-UNI), Frame Relay NNI (FR-NNI), ATM-FUNI, or frame forwarding as described in FRSM Connection Types, page 4-2.

Fractional FRSM cards include

•AX-FRSM-4T1/E1: four E1 or T1 interfaces. The 4-port FRSM supports up to a maximum of 256 connections (virtual circuits), which can be allocated across the T1 or E1 lines in any manner.

•AX-FRSM-8T1/E1: eight E1 or T1 interfaces. The 8-port FRSM supports a maximum of 1,000 connections. The maximum frame size is 4510 bytes for Frame Relay and 4096 for ATM-FUNI.

Channelized FRSMs

Each interface of a channelized FRSM supports multiple ports at 56 kbps or nx64 kbps.

Each port can be independently configured to run Frame Relay UNI (FR-UNI), Frame Relay NNI (FR-NNI), ATM-FUNI, or frame forwarding as described in FRSM Connection Types, page 4-2.

Channelized FRSM cards include

•MGX-FRSM-8T1-C—eight channelized T1 interfaces support 24 ports per interface.

•MGX-FRSM-8E1-C—eight channelized E1 interfaces support 31 ports per interface. The 8-port channelized FRSM supports a maximum of 1,000 connections.

Figure 4-3is an illustration of 4-port and an 8-port FRSM front cards for T1 or E1 lines.

 

 

Cisco MGX 8220 Installation and Configuration

 

 

 

 

 

 

 

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

 

 

4-7

 

 

 

 

 

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Cisco Systems MGX 8220 manual FRSMs for T1 and E1 lines, Fractional FRSMs, Channelized FRSMs
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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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