This document provides an overview of key concepts related to Frame Relay networks, including the User Network Interface (UNI) and Network-to-Network Interface (NNI) that define connections between user devices and networks. It describes common connection types like Permanent Virtual Circuits (PVCs) and Switch Virtual Circuits (SVCs), as well as how Frame Relay networks support mesh networking topologies with virtual private networks (VPNs). The document concludes by noting that Frame Relay involves less network processing than earlier protocols like X.25.

1. Good morning
everyone

2. Frame Relay Network
Producer: Kevin
Linda
Keith

3. Frame Relay Network
• User Network Interface (UNI)
• Network-to-Network Interface (NNI)
• Integrated Services Digital Network (ISDN)
• Permanent Virtual Circuits (PVCs)
• Switch Virtual Circuits (SVCs)
• Mesh networking
• Network processing

4. User Network Interface
(UNI)
•UNI is the demarcation point between the
user DTE and the network and the network
and is in the form of a FRAD and a FRND.
•UNI 是资料终端设备为分界点之间的用户和网络 , 网络
, 并且是在帧中继访问设备的形式和和帧中继网络设备
。

5. Network-to-Network Interface
(NNI)
•NNI is defined as the interface between FRNDs in
different Frame Relay networks and is based on
MultiNetwork PVCs. Most network-to-network
connections are provided over digital SONET/SDH
optical fiber trunks and through ATM switches.
•NNI 的定义是 FRNDs 之间的界面在不同的帧中继网络和
基于 Multi-Network 永久虚拟回路 。提供网络到网络连接
就数字 SONET / SDH 光纤树干和通过 ATM 交换机。

6. Integrated Services Digital Network
(ISDN)
•ISDN is the basis of the internal Frame Relay
network, as the LAP-F protocol that governs the
user links is an adaptation of the ISDN LAP-D
protocol.
•ISDN 的基础是内部帧中继网络 , 为 LAP-F 协
议管辖用户连接是一种适应性的 ISDN LAP-D
协议。

7. Permanent Virtual Circuits
(PVCs)
•PVCs define fixed paths through the network for each source-
destination pair.
•PVC 定义固定路径通过网络为每个 source-destination 的一对。
•The PVC is always used to serve a given source-destination pair.
PVC 总是用来为给定的 source-destination 的一对。
•A backup PVC can be provisioned ,at additional cost, over a
separate physical path.
一个备份 PVC 可以呆帐 , 付出额外费用 , 在另外的一个物理的
路径。

8. Switch Virtual Circuits
(SVCs)
•SVCs are set up call by call, based on programmed network routing
option.
•SVC 的建立是来电呼叫 , 基于程序的网络路由选择。
•An SVC call is established as the originating FRAD sends a request to the
network node, including a destination address and bandwidth parameters for
the call.
SVC 叫成立 , 为原产于 FRAD 发送一个请求网络节点 , 包括目的地地
址和带宽参数进行了电话。
•The next SVC provided for the same source-destination pair could differ
greatly, depending on network availability.
接下来对同一 source-destination SVC 提供他们可以大大不同 , 这取决于
网络的可用性。

9. Mesh networking
•Mesh network is easy accomplished with Frame Relay ,and on
a scalable basis.
•网状网络是容易的完成 , 并在帧中继的一个可扩展的基础
。
•Frame Relay network can be classified as VPNs, as they are
virtually equivalent to a private network ,at least in many
respects.
帧中继网络可分为 VPN, 因为他们实际上是相当于一个私
人的网络 , 至少在多个方面。

10. Network processing
•Network processing is not performed in
Frame Relay, at least not to the extent
experienced in X.25 networks.
•网络加工中不用执行帧中继 , 至少不会
在某种程度上经历了在 X . 25 网路。

11. 帧中继网络设备图

12. Thank you for your viewing
Goodbye