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Designing ISDN Internetworks 11-3

Introduction

be running on the PC. These features make the Cisco AccessPro PC card suitable for small

businesses and home ofﬁces that have a small Ethernet or Token Ring network whose users

occasionally need to connect to a central site.

The Cisco 1003 is a desktop router that, with one BRI and one Ethernet interface, provides

connectivity for small-to-medium size remote ofﬁces. It runs the Cisco IOS software, which routes

IP, IPX, and AppleTalk and bridges other protocols. The Cisco 1004 is similar to the Cisco 1003, but

it contains a built-in NT1.

The Cisco 2503 is suitable for medium-to-large size remote ofﬁces. It provides one Ethernet

interface, one BRI, and two synchronous serial ports. The Cisco 2504 provides one Token Ring

interface, one BRI, and two synchronous serial ports for connectivity over leased lines.

The Cisco 2516 is suitable for large remote ofﬁces. It provides one Ethernet interface (14 hub ports),

two synchronous serial ports, and one BRI. The Cisco 2517 provides one Token Ring interface

(11 hub ports), one BRI, and two synchronous serial ports for connectivity over leased lines.

Central Site Options

The central site can be a Cisco 4000 series router, which supports up to 16 BRIs provided by network

processor module cards (NPMs). The Cisco 4000 series can also be conﬁgured with up to two

multichannel interface processor (MIP) cards. Each MIP card provides two PRIs. The T1 version of

the MIP card yields 23 B channels and one 64-kbps D channel per MIP card interface. The E1

version of the MIP card yields 30 B channels and one 64-kbps D channel.

The central site can also be a Cisco 7000 series router or a Cisco 7500 series router with MIP cards

providing PRIs.

Table 11-1 summarizes the ISDN capabilities of Cisco routers.

Table 11-1 Cisco Routers ISDN Support

Router Product ISDN Interface

Cisco 750 series One BRI

AccessPro PC card One BRI

Cisco 1003/4 One BRI

Cisco 2503/4 One BRI

Cisco 2516/17 One BRI

Cisco 4000 series router (per NPM) Four or eight BRIs per NPM, one PRI per NPM

Cisco 7000 series/Cisco 7500 series One or two PRIs per MIP

1 2 3 4 5 6 7 8 ... 33 34

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