Specifications

3-3
Cisco AS5x00 Case Study for Basic IP Modem Services
11/24/1999
Section 3 Commissioning the Cisco AS5800 Hardware
Understanding the Basic Hardware Architecture
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The Cisco 7206 router shelf contains the following:
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Port adapters. In this case study, the Cisco 7206 uses Fast Ethernet (FE) 0/1/0 to connect to the
IP backbone.
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A dial shelf interconnect (DSI) port adapter. In this case study, the adapter is located at 0/2/0.
The Cisco 7206 communicates with the Cisco DS5814 dial shelf through an external dial shelf
interconnect cable. The cable connects from the DSI port adapter to the dial shelf controller
(DSC) card.
The Dial Shelf Interconnect Protocol (DSIP) enables communication between the Cisco 7206
and the Cisco DS5814.
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Service adapters (for example, compression and encryption).
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By default, a shelf ID of 0 is assigned to the router shelf.
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The Cisco DS5814 dial shelf contains the following:
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Dial shelf controller (DSC) cards. They fit in slots 12 or 13 only. If you have only one
DSC card, slot 12 is recommended. One DSC card is used in this case study.
The DSC card contains its own Cisco IOS image. For maintenance purposes only, the card can
be accessed through its console port and Ethernet interface. No IP packets originating from any
trunk or modem cards go out this Ethernet interface.
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T3/T1/E3/E1 cards. They connect to the PSTN and fit in slots 0 through 5 only. Slots 0 and 1
are recommended. In this case study, one T3 trunk card is located at 1/0/0.
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Modem/voice cards. They fit in slots 0 through 11. In this case study, nine modem cards are
installed. The first modem card is in slot 2. The line-modem range is 1/2/00 to 1/10/143.
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By default, a shelf ID of 1 is assigned to the dial shelf.
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The Cisco SC3640 system controller is an external management subsystem. It interfaces with the
Cisco 7206 and provides the following functions:
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SNMP and syslog off loading
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Out-of-band console access
Call-Processing Components
As shown in Figure 3-2, the following components are used to process a call:
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Client modems and ISDN routers dial into the access server through the PSTN.
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Asynchronous PPP calls (analog) connect to modems inside the access server.
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Each modem inside the access server provides a corresponding TTY line and asynchronous
interface for terminating character and packet mode services.
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Asynchronous interfaces clone their configurations from a group-async interface.
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Synchronous PPP calls (digital) connect to serial interface channels (for example, S1/0/0:0:0
and S1/0/0:0:1).
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Synchronous interfaces clone their configurations from a dialer interface.