Cisco AS5800 Specifications Page 23

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1-5
Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide
DOC-7810814=
Chapter 1 Introduction
Network Topology and Equipment Selection
Network Topology and Equipment Selection
Figure 1-1 shows the topology devices used to build dialup access environments.
Figure 1-1 Network Topology Elements
Corporate users and ISPs may have identical network topologies:
Remote clients use analog modems to access the IP backbone through the PSTN.
A Cisco AS5800 NAS is used as a point-of-presence (POP) to terminate modem calls and
Point-to-Point Protocol (PPP) sessions.
PRI lines are used to provide high throughput (64K) for digital and analog calls. In general, T1 lines
can be ISDN PRIs or channelized T1s.
A network element management server maintains and monitors the Cisco AS5800 by using the
Network Time Protocol (NTP), system logs (syslog), and the Simple Network Management Protocol
(SNMP).
A remote AAA server performs basic user authentication. Corporate users and ISPs can use
TACACS+ or RADIUS.
A default gateway forwards packets to the IP intranet and Internet.
An Internet firewall is used to protect the IP intranet from intruders and hackers.
A router provides connectivity between the access subnet and the IP backbone.
For the latest Cisco IOS features and bug fixes, the Cisco AS5800 is upgraded to Cisco AS5800
12.0(4) XL or 12.0(5)T releases.
Note Use a mature Cisco IOS release whenever possible.
Internet
33166
Clients
Modems
Network element
management server
(NTP, Syslog, SNMP)
AAA
server
Internet
firewall
Default
gateway
PSTN
PRI lines
Analog lines
DNS
server
IP intranet
V
Cisco AS5850
with integrated
modems
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