Cisco Octal-Port DMT ATU-C Line Card Manuale Utente

This chapter covers the following topics:• ADSL Overview• Cisco 6160 DSLAM Overview• Cisco 6400 UAC Overview• DSL Access Architectures and Protocols07

Cisco 6400 UAC Overview 185The 6400 is a broadband concentrator that supports Cisco’s ATM services, PPP termination, and tunneling. The Cisco 6400

186 Chapter 8: Using DSL to Access a Central SiteAll line cards are connected to the ATM backplane to the NSP. This interface is known as interfa

DSL Access Architectures and Protocols 187remote end. Bridge groups are defined by associating VCs with each other. Bridge groups can be defined in

188 Chapter 8: Using DSL to Access a Central SiteStep 5Assign a network interface to a bridge group:bridge-group bridge-groupStep 6 Enables a bri

DSL Access Architectures and Protocols 189Figure 8-6 RBE Protocol StackTo configure RBE, follow these steps:Step 1 Configure the ATM subinterface, a

190 Chapter 8: Using DSL to Access a Central SitePPPoA OverviewWhen configured for PPP over ATM, the ATU-R acts as a router, and additionally prov

DSL Access Architectures and Protocols 191Step 2Create an ATM subinterface and PVC:interface atm slot/0.subinterface-number {multipoint | point-to

192 Chapter 8: Using DSL to Access a Central SitePPPoE OverviewFor PPPoE, the ATU-R is transparent to this function, bridging the MAC/PPP frames

DSL Access Architectures and Protocols 193Step 4Configure the VPDN group to accept the dial-in and to be used to establish PPPoE sessions. Also spe

194 Chapter 8: Using DSL to Access a Central SiteScenariosThis section presents several examples of DSL access configurations. The scenarios cover

C H A P T E R8Using DSL to Accessa Central SiteThis chapter focuses on Digital Subscriber Line (DSL) technology. DSL, like cable modem, is one of the

Scenarios 195In Example 8-13, the PVC is mapped from the Cisco 827 DSL connection (ATM1/1) to the DSLAM trunking port (ATM0/1).In Example 8-14, th

196 Chapter 8: Using DSL to Access a Central SiteExample 8-16 shows the bridging configuration for the DSL CPE.Scenario 8-2: Configuring RBE over D

Scenarios 197Figure 8-10 RBE ScenarioIn Example 8-17, the PVC is mapped from the Cisco 827 DSL connection (ATM1/2) to the DSLAM trunking port (ATM

198 Chapter 8: Using DSL to Access a Central SiteExample 8-20 shows the bridging configuration for the DSL CPE. As you can see, the CPE configurati

Scenarios 199Figure 8-11 PPPoA Lab ScenarioIn Example 8-21, the PVC is mapped from the Cisco 827 DSL connection (ATM1/3) to the DSLAM trunking por

200 Chapter 8: Using DSL to Access a Central SiteExample 8-24 shows the PPPoA configuration for the DSL CPE.When a PPP connection is made, a virtu

Scenarios 201Scenario 8-4: Configuring PPPoE over DSLIn this scenario, you will configure the DSL solution to support data transport using PPPoE. Wh

202 Chapter 8: Using DSL to Access a Central SiteIn Example 8-26, the PVC is mapped from the Cisco 827 DSL connection (ATM1/4) to the DSLAM trunk

Scenarios 203For PPPoE over DSL, the DSL CPE is also configured for pure RFC 1483 bridging, as shown in Example 8-29.When a PPP connection is made,

204 Chapter 8: Using DSL to Access a Central SitePractical Exercise 8-1: PPPoA over DSLIn this practical exercise, both lab-827A and lab-827B are

178 Chapter 8: Using DSL to Access a Central SiteFigure 8-1 Typical End-to-End ADSL SystemThe ATU-R is typically connected to an external splitte

Practical Exercise 8-1 Solution 205Example 8-31 Configuration Output for lab-827A lab-827A#show running-configversion 12.2no service padservice tim

206 Chapter 8: Using DSL to Access a Central Siteline con 0 stopbits 1line vty 0 4 login!scheduler max-task-time 5000endExample 8-32 Configuration

Practical Exercise 8-1 Solution 207In Example 8-33, two DSL profiles, premium and standard, are defined. As you can see, each of them is configured w

208 Chapter 8: Using DSL to Access a Central Site!!!!interface ATM0/0 no ip address atm maxvp-number 0 atm maxvc-number 4096 atm maxvci-bits 12!i

Practical Exercise 8-1 Solution 209line con 0line aux 0line vty 0 4!endExample 8-34 Configuration Output for lab-6400NSP lab-6400NSP#show running-c

210 Chapter 8: Using DSL to Access a Central Siteinterface ATM2/0/1 no ip address no atm ilmi-keepalive!interface ATM3/0/0 no ip address no atm i

Practical Exercise 8-1 Solution 211Example 8-36 shows that lab-827A has successfully passed the PPP negotiation and authentication. An IP address

212 Chapter 8: Using DSL to Access a Central SiteExample 8-37 shows that lab-827B has successfully passed the PPP negotiation and authentication.

Practical Exercise 8-1 Solution 213 Encapsulation PPP, loopback not set Keepalive set (10 sec) DTR is pulsed for 5 seconds on reset LCP Open

214 Chapter 8: Using DSL to Access a Central SiteExample 8-41 displays the DSL profile status for the default profile, premium profile, and standard

Cisco 6160 DSLAM Overview 179Other sources of interference include the following:• Impedance changes• Bridged taps• Crosstalk• Impulse hitsTechniq

Practical Exercise 8-1 Solution 215lab-827A is patched to port 1/1, and lab-827B is patched to port 1/2. Example 8-42 displays the status of the D

216 Chapter 8: Using DSL to Access a Central SiteThe show dsl interface atm slot#/port# command allows you to display DSL, DMT, and ATM status fo

Practical Exercise 8-2 Solution 217Practical Exercise 8-2: RFC 1483 Bridging over DSLIn this practical exercise, lab-827A and lab-827B are connect

218 Chapter 8: Using DSL to Access a Central SiteExample 8-44 Configuration Output for lab-827Alab-827A#show running-configBuilding configuration.

Practical Exercise 8-2 Solution 219Example 8-46 shows the bridging configuration of the Cisco 6400.Example 8-45 Configuration Output for lab-827B la

220 Chapter 8: Using DSL to Access a Central SiteExample 8-46 Configuration Output for lab-6400NRP lab-6400NRP#show running-configBuilding configu

Practical Exercise 8-2 Solution 221Example 8-47 shows that Bridge group 1 is running the IEEE Spanning Tree Protocol.Example 8-48 shows the IP and

222 Chapter 8: Using DSL to Access a Central SiteExample 8-49 illustrates that both subinterfaces are in the same bridge group (Bridge group 1),

Summary 223dmt interleaving-delay downstream delay-in-µsecs upstream delay-in-µsecsSets the interleaving delay parameter.dmt training-mode {standa

224 Chapter 8: Using DSL to Access a Central SiteReview Questions1 Which of the following modulation methods is not used for ADSL technology?A. C

180 Chapter 8: Using DSL to Access a Central SiteFigure 8-2 Cisco 6160 DSLAM ChassisNOTE You can install line cards of two or more different type

Review Questions 2255What is the function of the POTS splitter?A. It separates low and high frequencies.B. It manages ADSL signaling.C. It generat

Cisco 6160 DSLAM Overview 181As shown in Table 8-2, interfaces whose names begin with ATM1 through ATM34 are line card interfaces. Ethernet0/0 is

182 Chapter 8: Using DSL to Access a Central SiteTo create a DSL profile, or to select an existing profile for modification, use the following comma

Cisco 6160 DSLAM Overview 183dmt-margin is equal to the upstream and downstream SNR margins in decibels. Values must be nonnegative integers. The

184 Chapter 8: Using DSL to Access a Central SiteSetting the Training ModeTwo training modes are available—standard and quick. Standard train rel