Understanding Basic Hardware Architecture and Cisco IOS Software
Exploring the Cisco IOS File System
3
Cisco AS5350XM and Cisco AS5400XM Universal Gateways Software Configuration Guide
Figure 1
shows the following:
•
Client modems and Integrated Services Digital Network (ISDN) routers dial into the gateway
through the public switched telephone network (PSTN).
•
Analog Point-to-Point Protocol (PPP) calls connect to modems inside the gateway.
•
Each modem inside the gateway provides a corresponding TTY line and asynchronous interface for
terminating character and packet mode services.
•
Asynchronous interfaces clone their configurations from a group-async interface.
•
Synchronous PPP calls connect to serial interface channels (for example, Se2/0:1 and Se2/0:2).
•
Synchronous interfaces clone their configurations from a dialer interface.
One analog PPP call uses the following resources:
•
One T1 DS0 channel
•
One channel in a time-division multiplexing (TDM) bus
•
One integrated modem
•
One TTY line
•
One asynchronous interface
One synchronous PPP call uses the following resources:
•
One T1 DS0 channel
•
One serial interface channel
Exploring the Cisco IOS File System
The Cisco IOS File System (IFS) feature provides a single interface to the following:
•
Flash memory file system
•
Network file system (TFTP, rcp, and FTP)
•
Any other endpoint for reading or writing data (such as NVRAM, modem firmware, the running
configuration, ROM, raw system memory and flash load helper log)
Note
The Cisco AS5350XM and Cisco AS5400XM universal gateways use a Class C Flash File
System.
IFS first appeared in Cisco IOS Releases 11.3 AA and 12.0. For more information about IFS, see the
chapter “Using the Cisco IOS File System” in the
Cisco IOS Configuration Fundamentals Configuration
Guide
for your software release.
