Specifications

C-8
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Appendix C ATM: An Overview
Figure C-7 BAM, CAM, and SAM Configurations
FastPacket Adaptation to ATM
A specialized adaptation of particular interest to users of Cisco equipment is the adaptation of IPX
switch FastPackets to ATM cells. A large number of narrowband IPX switch networks currently in
existence efficiently carry voice, video, data, and Frame Relay. A means must be provided to allow
these networks to grow by providing a migration path to broadband.
Because FastPackets are already a form of cell relay, the adaptation of FastPackets to ATM cells is
relatively simple.
CAM—
Cloud Addressing
Mode
UNI VPI = User Programmed
VCI = Node Derived
Address
IGX switch to IGX switch connections over
networks using ATM switches that switch on
VPI only. VPI is manually programmed by
user. Terminating switch converts VCI address
to FastPacket address.
SAM—
Simple Addressing
Mode
UNI VPI/VCI = User
Programmed
IGX switch to IGX switch connections over
networks using ATM switches that switch
where all routing is manually programmed by
user,bothVPIandVCI.
Table C-2 ATM Cell Addressing Modes
Addressing Mode Hdr. Type Derivation of VPI/VCI Where Used
BAM IGX BTM IPXAIT
BAM IPX AIT BPXBNI
CAM IPX AIT IPXAIT
SAM
Note: IPX with AIT card are interchangeable with IGX with BTM card in this diagram.
IPX AIT IGXBTM
ATM cloud
VP switch
ATM cloud
VP/VC switch
H8150