Components of a Frame Relay Network

Lesson 4 - Agenda Frame Relay network reference diagram and terminology Frame Relay network components Connecting the Internet Advisor

Lesson 4 - Objectives By the end of this lesson you will be able to: Identify common Frame Relay network components and describe their purpose. Define common terms used to describe Frame Relay networks. Demonstrate how to connect the Internet Advisor to a network under test.

Frame Relay Network Reference Diagram PVC CPE NET PVC UNI PVC PVC NNI CPE NET Interface Between CPE and NET Current implementations of frame relay make use of permanent virtual circuits (PVC's), also known as permanent logical links (PLL)s to interconnect users. These PVC's connect the end user sites through shared rather than dedicated facilities. (The term "virtual circuit" is used to mean that a method other than a specific physical, electrical path is used to connect two points.) This diagram will be helpful to define some of the key elements used in frame relay: 1). The user accesses the frame relay service through a local frame relay access device (FRAD) which supports the protocol and transfers and routes frames to and from the frame relay network. 2). A frame relay switch (FRS) provides the service access to the users. This frame relay switch is part of a frame relay network which provides a switching and transport backbone (which may or not be frame relay). The local FRS supports the local loop access to the frame relay service. 3). The FRAD is connected to the FRS through a defined User-to-Network Interface (UNI). The UNI consists of defined physical interfaces, the frame relay link layer protocol and in-channel signaling procedures. UNI specifications are governed by the national and international standardizing bodies and the Frame Relay Forum User-to-Network Interface Implementation Agreement FRF-1. UNI CPE = Customer Premise Equipment NET = Frame Relay Network PVC = Permanent Virtual Circuit UNI = User to Network Interface NNI = Network to Network Interface

Frame Relay Network Components FRS FRAD Connection-Oriented Protocol Frame Relay is a connection-oriented protocol and defines an interface between Customer Premise Equipment (CPE) such as a LAN bridge, router, or front-end processor, and a network to provide high performance LAN interconnection across a Wide Area Network (WAN). Frame Relay is a packet-switched data network for wide area networking. Frame Relay is connection-oriented, and uses logical virtual circuit connections to transmit data between end user locations. Although the Frame Relay Specification provides for both permanent (PVC) and switched (SVC) virtual circuits, most service providers offer only PVC services. Frame relay access devices (FRADs) and/or frame relay switches (FRS) are connected to each other by physical links, usually a DS0 or DS1 (T1) circuit. Several of these links interconnected make up a permanent virtual circuit (PVC) connecting remote networks. A primary application for frame relay is the internetworking of local area networks. FRS = Frame Relay Switch FRAD = Frame Relay Access Device PVC = Permanent Virtual Circuit SVC = Switched Virtual Circuit

Connecting to the Network Monitoring and Emulating V-series T1/E1 DDS 4-wire

UNI Test Points Connecting the HP Internet Advisor: to T1 to CEPT-E1 to V-Series to T1 to CEPT-E1 FRAD Frame Relay Network demarc Patch Panel T1 B8ZS ESF or E1 HDB3 or V-series V-series (V.35, V.11) 56 - 2048 kbps T1 RJ-48C or Bantam or E1 Proprietary 56, 64, 384, 768, 1536, 1936 kbps FRS CSU DSU E1 3-prong or coax T1 DSX-1

Monitoring Traffic with V-Series V.35, V.24, V.36 Y-cable CSU FRAD (router)

WAN Monitor Configuration

Internet Advisor as DCE DTE Female connector

Internet Advisor as DTE DCE DTE Female connector

WAN Simulate DTE Configuration

Monitoring Traffic with T1 Test Point Connections on the CSU/DSU or Patch Panel Equip Mon Out Line Mon Out Connect to “EQPT In” and “LINE In” HP Internet Advisor Out-EQPT-In In-LINE-Out To EQPT To LINE MONITOR

Through Mode Monitoring Traffic with T1 CSU HP Internet Advisor EQPT OUT LINE IN LINE OUT EQPT IN Out-EQPT-In In-LINE-Out To EQPT To LINE MONITOR FRS Using Bantam jacks in through/bridged mode

Monitoring Traffic with T1 HP Internet Advisor Out-EQPT-In In-LINE-Out To EQPT To LINE MONITOR CSU FRS Using RJ48C cables in through mode

Emulating UNI on T1 Connection for Emulating UNI-NET EQPT Signals LINE Signals CPE (FRAD or Router)

Emulating UNI on T1 Connection for Emulating UNI-CPE CSU/DSU EQPT Signals LINE Signals CSU/DSU

T1 Receiver Mode For T1 monitoring it is important the the Receiver Mode be set correctly. This configuration parameter ensures that the Internet Advisor’s T1 receiver’s impedance matches that of the monitored circuit. Bridged -- when the Advisor is passing the signal between two devices (through mode) Terminated -- when the Advisor is at the end of the line and terminates the signal Monitor Jack -- when the Advisor is attached to lower amplitude, isolated monitor points (such as at a DSX or DSU/CSU) Through Drop & insert -- when the Advisor passes through most time slots, but replaces selected time slots with data generated by the Advisor.

Monitoring Traffic with the DDS 4-wire Module Test Point Connections on the CSU/DSU or Patch Panel Equip Mon Out Line Mon Out To Eqpt To Line

Emulating DCE or DTE with the DDS 4-wire Module Test Point Connections on the CSU/DSU or Patch Panel Equip Mon Out Line Mon Out Emulating the DCE Emulating the DTE To Eqpt To Line

Lesson 4 - Review You should be able to: Identify common Frame Relay network components and describe their purpose. Define common terms used to describe Frame Relay networks. Demonstrate how to connect the Internet Advisor to a network under test.