Chapter

VPI/VCI Mapping

VC Connections

For FRASM and AUSM VC connections, the user associates a logical channel number (LCN) with the connection DLCI for a service module in a particular slot. The card’s slot number is used as the value for the VPI and the LCN is used as the value for the VCI.

The VPI, therefore, is a number in the range of 5 to 14 (the range of permissible slots for service modules in the MGX 8220).

The VCI range is determined by the service module type and is 16 to 271 for 4-port FRAM and AUSM modules and 16 to 1015 for 8-port modules.

VP Connections

For AUSM VP connections, the situation is more complicated. The CPE port VPI value will most likely be different from the network VPI. Depending upon the BNM interface format (UNI or NNI), the range of VPI values is evenly divided among the 10 service module slots. During the process of adding a VP connection, the user is asked to assign a VP ID where the VPID is an index corresponding to the VPI within the assigned range.

The ranges of VPID for the various service modules are shown in Table 6-1.

Table 6-1 VPID Ranges

Interface Type

VPID

 

 

 

 

 

AUSM-4T1E1

AUSM-8E1T1

 

 

 

UNI

1–20

1–20

 

 

 

NNI

1–255

1–340

 

 

 

There are two methods that can be used to identify the network VPI associated with an AUSM VP connection.

The first method is to enter the dspadrxlat command. This command lists all the VC and VP connections currently existing on the shelf in slot number/channel number order showing the connection type and the VPI value for each connection.

For example, the command

myshelf.1.4.ASC. a > dspadrxlat

could result in the following response

Chan

Connection Type

VPI

 

 

 

1.8.16

vpConnection

76

 

 

 

The second method is to calculate the VPI from the slot number and the VPID value.

For UNI interface format:

VPI = (slot number - 5) * 20 + (VPID - 1) + 16

For NNI interface format:

VPI = (slot number - 5) * 340 + (VPID - 1) + 16

 

Cisco MGX 8220 Installation and Configuration

6-4

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

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Cisco Systems MGX 8220 manual VC Connections, VP Connections, Interface Type, Uni Nni, Chan Connection Type
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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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