3Com REMOTE ACCESS SYSTEM 1500, Management Manual

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18 C
HAPTER
1: O
VERVIEW
Overview
The SuperStack
®
II Remote Access System (RAS) 1500 is a powerful data
communications platform that supports a broad variety of applications.
Basic Configuration The basic configuration of a RAS 1500 consists of one Router Unit with
the following options:
■
Two Basic Rate Interface (BRI) line connections, expandable to four
■
Four analog lines, expandable to eight
Port Expansion
Module
Configuration
The RAS 1500 allows you to add two Port Expansion Units to your stack.
The addition of the expansion units allows your RAS 1500 stack to
support up to 12 Integrated Services Digital Network (ISDN) BRI lines or
24 analog lines.
Primary Access Unit The RAS 1500 maybe be configured with a Router Unit and a Primary
Access Unit as follows:
■
T1 (North America) Primary Access Unit with 23 Primary Rate Interface
(PRI)-ISDN channels
■
E1 (European) Primary Access Unit with 30 PRI-ISDN channels
Applications
The RAS 1500 is a multiprotocol, dial-up router and terminal server
commonly described as a remote access server. The RAS 1500 performs
the following four basic applications:
■
Dial-In
■
Shared ISP
■
LAN-to-LAN
■
Individual Dial-Out
Dial-In The RAS 1500 provides dial-in network access for remote users. Remote
Internet Protocol (IP), Internetwork packet eXchange (IPX), and AppleTalk
network users can dial in and attach to the local network as if they were
on local nodes.
Packets transmitted over the dial-in connection are encapsulated using
the following protocols:
■
Point-to-Point Protocol (PPP)