Advertisment

MANAGED DATA NETWORKS

author-image
VoicenData Bureau
New Update

Managed Data Networks (MDNs) offer a multi-service,

integrated and managed access network platform for carriers enabling them to have carrier

class quality in new technology networks. Industry leader Tellabs explains.

Advertisment

The telecom service demands of business and

cor-porate subscribers are increasing day by day. The business communications services

needed by corporate community need to be offered efficiently and cost-effectively.

Business communication services are expected to be provided with high degree of Quality of

Service (QoS) keeping price performance ratio, flexibility, control, manageability and

fast service provisioning as the main criteria.

alt="contributed9.gif (4140 bytes)" align="left" hspace="4" vspace="4"> size="2">Corporate houses are outsourcing the Wide Area Networking to public service

providers to provide multi-service solutions to realize their Virtual Private Networks

(VPNs) and on-line connectivity of their geographically distributed offices.

MDNs are targeted towards the creamy layer

of corporate subscribers and alternate service providers who contribute maximum revenue

potential to the incumbent operator/PTT carrier. MDN solutions offer this differentiator

for bulk revenues.

Advertisment

Public operators faced with increased

competition, need a powerful differentiator to meet these demands and to build a

profitable business

MDN Concept



MDN is an integrated, next generation access network offering

National Digital Data Services.

MDN is an overlay network realized

through a family of digital networking elements co-located with PTT equipment offering all

access services over multiple choices of media like xDSL, HFC, Fiber and radio from a

single MDN node.

Advertisment

It encompasses all the functionalities of

FR access, ATM access, IP access through a single network realised through multi-service

nodes supporting a variety of media interfaces as against the traditional way of building

different networking clouds for different services using multiple networking elements and

platforms. MDN, in a simplistic form, is used to provide "a slice of bandwidth for

a slice of time"
with command based "source and destination programmability

and Type of Service (ToS) programmability".

It is driven by a powerful GUI based

comprehensive management system covering all aspects of Service Oriented Operator covering

business, service, network and node management.

The Prime Drivers



Main drivers for MDN are telecom liberalization, revolution in access

technologies like xDSL, radio and cable, Internet, corporate VPN and e-commerce, evolution

of fiber in the loop, attractive tariffs for leased-lines, and thrust on business

subscriber bulk revenues.

Advertisment

Targeted Customers



Bulk revenue-contributing customers on MDN solution are paging operators, GSM

operators, basic service operators, ISPs, corporates, media, and banking/FI segments.

MDN Services



MDN offers a comprehensive service suite to a variety of customers needing

different bandwidths and access services.

Typical MDN Architecture



MDNs are realized through a 3-layer networking model as shown below.

Advertisment

The deployment of MDN nodes in different

layers signifies the functionality and capability of the user layer nodes, exchange layer

nodes, and tandem layer nodes. These nodes are typically scalable in capacity and

functionality from bandwidths of 64 Kbps…n*64 Kbps … 2 Mbps… n*2

Mbps….64 Mbps….N*64 Mbps up to 2.5 Gbps.

MDN nodes are one-time infrastructure

investment elements and they could be upgraded by minimal initial investments. They also

offer protection of initial investments, optimal incremental investments, incremental

capacity increase of nodes, phased functionality upgrade of nodes.User Layer



alt="contributed13.gif (26314 bytes)" align="right" hspace="4" vspace="4"> face="Arial" size="2">Carriers and public network operators who are used by the corporates

to outsource their WAN requirement resort to the deployment of a single network element

called NTU which encompasses the functionality of DTE interface support with built-in XDSL

driver functionality. This NTU is expected to support multiple traffic types and multiple

protocol sensitive data services like FR, ATM, IP, VPN etc.

Exchange Layer



Typical MDN Exchange Node functionality, capacity & features are shown in the

diagram below.

Advertisment

The Exchange Node collects the

multi-service traffic from the User Layer and hubs, grooms and switches to the other MDN

nodes in the network and towards the Tandem Layer MDN node through the built-in PDH/SDH

transport interfaces.

Tandem Layer



The Tandem Node collects the multi-service traffic from the Exchange Layer Nodes and
switches to the other MDN nodes in the network as well as to the other public networks

carrying ATM/FR/IP traffic over transport media through the built-in PDH/SDH transport

interfaces.

Applications



Bulk Revenue customers who contribute more than 80 percent of revenue to public

network operators over MDN are alternate service providers, networking for E-Governance,

corporate customers, and legacy & enhanced services.

Advertisment

Managed Bandwidth leasing providing a host

of telecom services, irrespective of type of traffic, to the corporates, state governments

and ASPs is the core application domain of MDN. Profitable data delivery, multi-service

delivery, and turning competitive ASPs into customers are the business value-propositions

of MDN.

E-Governance on MDN



A typical application of State Wide Area Network (SWAN) supporting on-line

connectivity of geographically distributed government offices spread across multiple

districts to the state head quarters is another major revenue source for MDN of a public

operator.

Typical applications like PBX-IC, LAN-IC

and Videoconferencing drive the need for state governments to outsource WAN realization

through the public networks’ operator MDN. In addition Internet access, intranet and

extranet applications for state governance needs could also be supported on the same SWAN

realization over the MDN.

MDN for ISPs



Class-A ISP operators having nationwide Internet Points of Presence (PoPs) need

to depend on the incumbent carrier (PTT) for the connectivity between the Intracity PoPs

and Intercity PoPs.

ISPs realize their backhaul and backbone

connectivity of PoPs through the service-oriented approach and assured QoS and

Service Level Agreements (SLAs) support from the MDN of incumbent operator.

One Network, Many Business Services



MDNs have been well-proven, time-tested, and stable networking platforms meant

primarily for addressing the bulk revenue customer segment of the telecom operators’

revenues base. MDNs offer a multi-service, integrated and managed access network platform

for PTTs and ASPs, enabling them to have a true carrier class networking infrastructure to

be in place supporting all legacy services, emerging services, and next generation

services through the support of ATM, FR, IP on PDH/SDH backbone networks.

The built-in access media support of xDSL,

Radio in ISM band in MDN nodes enhance the utility of MDNs to offer broadband data

delivery service for corporates who are eternally looking for increased bandwidths with

fast provisioning, testability, and on-line performance monitoring capabilities of their

service needs.

Advertisment