Cisco Octal-Port DMT ATU-C Line Card Manual do Utilizador descarregar pdf (Página 11)

186 Chapter 8: Using DSL to Access a Central Site

All line cards are connected to the ATM backplane to the NSP. This interface is known as

interface ATM0/0/0 and can be thought of as the interface to the NSP from an NLC or NRP

card’s perspective. Example 8-7 shows information about the NSP’s ATM backplane.

To create an ATM PVC on the Cisco 6400, you can use the following command syntax:

interface atm

slot

subslot

port

atm pvc

vpi vci

interface atm

slot

subslot

port vpi vci

Example 8-8 shows you how to create an ATM PVC. From the NSP, to create PVC 1/100

coming from NLC 8/0/0 to NRP 1/0/0, the 6400 commands are as shown.

DSL Access Architectures and Protocols

The following sections show you the different access architectures and protocols for the DSL

service. Four types of access architectures and protocols are covered in this chapter.

• IRB

• RBE

• PPPoA

• PPPoE

RFC 1483 Bridging and IRB Overview

When conﬁgured for RFC 1483 bridging, the ATU-R acts as a half bridge, forwarding all MAC

frames not present on the LAN side to the WAN interface. In the case of 1483 bridging,

802.3 MAC frames are encapsulated along with an LLC/SNAP header into cells using AAL5

segmentation. The LLC/SNAP header is used to identify the protocols encapsulated to the

Example 8-7 Internal Connection to the CPU Card

lab-6400NSP#show interface atm 0/0/0

ATM0/0/0 is up, line protocol is up

Hardware is CPU card

MTU 4470 bytes, sub MTU 4470, BW 155520 Kbit, DLY 0 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ATM, loopback not set

Keepalive not supported

Encapsulation(s):

4096 maximum active VCs, 0 current VCCs

VC idle disconnect time: 300 seconds

Signalling vc = 35, vpi = 0, vci = 16

UNI Version = 3.0, Link Side = user

Example 8-8 Creating an ATM PVC from the NLC to the NRP

interface atm 8/0/0

atm pvc 1 100 atm1/0/0 1 100

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