Cisco Octal-Port DMT ATU-C Line Card Manual de usuario descargar pdf (Pagina 10)

Cisco 6400 UAC Overview 185

The 6400 is a broadband concentrator that supports Cisco’s ATM services, PPP termination,

and tunneling. The Cisco 6400 combines ATM switching and routing in a modular and scalable

platform.

The 6400 UAC comprises three major functional components:

• Node Line Card (NLC)—A half-height line card. It features two OC-3 ATM interfaces

and supports SONET APS 1+1 redundancy.

• Node Switch Processor (NSP)—The centerpiece of the 6400 system. It performs ATM

switching and per-ﬂow queuing for the ATM virtual circuits.

• Node Route Processor (NRP)—Based on the Cisco 7200 series router. It supports a

variety of conﬁgurations, including PPP over ATM and RFC 1483 bridging. It is a full-

height line card.

Figure 8-4 illustrates how these components work together.

Figure 8-4 Typical Trafﬁc Flow for the Cisco 6400 UAC

The NLC receives trafﬁc from the DSLAM or other ATM network. The NLC sends this trafﬁc

to the NSP. The NSP acts as an ATM switch. The ATM cells must be sent from the NSP to the

NRP. The NRP handles routing functions for the 6400. The NRP reassembles the ATM cells

into data packets and determines where the data needs to be sent. Direct data connections can

be made via a Fast Ethernet port on the NRP. Other data packets are sent back through the NSP

to the NLC, where these packets may be routed through the ATM network.

Understanding interface numbering is also important before you conﬁgure the 6400. The interface

slot/subslot/port convention is used for both NLC and NRP. For NLC, the valid subslot and port

number are 0 and 1. Because NRP is a full-height card, the subslot and port are always 0. In

Example 8-6, NRP is installed in slot 1 and NLC is installed in slot 8, subslot 1.

Example 8-6 Cisco 6400 UAC Interface Numbering

interface atm 1/0/0 NRP in slot 1

interface atm 8/1/0 NLC in slot 8, sub-slot 1, port 0

DSLAM ATM

Fast Ethernet

0732x01.book Page 185 Monday, November 17, 2003 2:49 PM

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Cisco Octal-Port DMT ATU-C Line Card Manual de usuario Pagina 10