New Services IP networks offer unparalleled scalability and flexibility for rapid deployment of value-added IP services. However, with the increasing demand and explosive growth of the Internet, carriers require a network infrastructure that is dependable, predictable, and offers consistent network performance. Traffic engineering and differentiated services are the two cornerstones needed to a...

A method for determining the distribution of patch cord lengths formation physical layer modern IP-control systems is proposed. Assuming switching field on a regular basis and equiprobable connection individual ports, procedure was developed probability density function lengths, taking into account necessary margin in case unevenness laying. The calculation has been performed it shown that advi...

Recently MPLS is used for building up VPNs in IP backbone, called MPLS VPN. To provide people with voice, data and all categories of multimedia services, distinguishing between data flows is a requirement. To address these router performance, Quality of Service and traffic engineering issues, Multi Protocol Label Switching (MPLS) was proposed for IP based internetworks. To achieve the security ...

요 약 IP 망을 활용한 VPN(Virtual Private Network)에서의 QoS 보장 및 광대역 서비스 제공에 대한 해결 방안으로 차세대 광 인터넷을 통한 OVPN(Optical VPN) 기술이 제시되고 있다. 차세대 광 인터넷의 구현 이 IP/GMPLS(Generalized Multi-Protocol Label Switching) over DWDM(Dense Wavelength Division Multiplexing) 프로토콜 프레임워크로 표준화되고 있는 현실에 비추어 볼 때, IP/GMPLS over DWDM 백본망을 통한 OVPN 은 차세대 가상사설망으로써 멀티미디어 서비스 제공을 위한 최적의 방안이 다. 이러한 멀티미디어 서비스 제공을 위한 OVPN 에서는 최적의 Optical-LSP(...

Differentiated Services (DiffServ) has been standardized by the IETF and is considered as a promising IP QoS solution due to its scalability and ease of implementation. In this paper, we present a novel framework for IP Differentiated Services (DiffServ) over optical burst switching (OBS), namely, DS-OBS. We present the network architecture, functional model of edge nodes and core nodes, the co...

Currently we see a discussion on the transition from ATM-based transport to IP transport in the UMTS Terrestrial Radio Access Network (UTRAN). Issues that result from the transition to IP are QoS, esp. delay, jitter, loss, bandwidth guaranties and in sequence delivery of packets for voice traffic. The paper compares two solutions for future UTRANs, native IP multi-path transport and MPLS (Multi...

Many Service Providers offer Virtual Private Network (VPN) services to their customers, using a technique in which customer edge routers (CE routers) are routing peers of provider edge routers (PE routers). The Border Gateway Protocol (BGP) is used to distribute the customer’s routes across the provider’s IP backbone network, and Multiprotocol Label Switching (MPLS) is used to tunnel customer p...

Next Generation Network (NGN) is envisioned to be an internetworking environment of heterogeneous networks to offer next generation services anywhere, anytime. It integrates the services of 2G/3G/4G networks by incorporating IPv4/IPv6 into a single service platform with Multi-Protocol Label Switching (MPLS). Several efforts have been carried out by researchers to integrate MPLS technology into ...

Demand of IP telephone is increasing more and more as broadband IP network is being commonly used by many people. In VoIP, packet loss concealment (PLC) is one of the key subjects to keep speech quality since packet loss occurs in IP network. PLC methods based on Linear Predictive coding (LP) method have been proposed in which LP coefficients and LP residual are repeated to recover speech corre...

Many Service Providers offer Virtual Private Network (VPN) services to their customers, using a technique in which customer edge routers (CE routers) are routing peers of provider edge routers (PE routers). The Border Gateway Protocol (BGP) is used to distribute the customer’s routes across the provider’s IP backbone network, and Multiprotocol Label Switching (MPLS) is used to tunnel customer p...