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12-2 Cisco BPX 8600 Series Reference
Figure 12-1 Frame Relay to ATM Network Interworking
Figure 12-2 Frame Relay to ATM Service Interworking
H8225
CPE
Part A
Network interworking connection from CPE Frame Relay port
to CPE Frame Relay port across an ATM Network with the
interworking function performed by both ends of the network.
Part B
Network interworking connection from CPE Frame Relay port
to CPE ATM port across an ATM network, where the network
performs an interworking function only at the Frame Relay end
of the network. The CPE receiving and transmitting ATM cells at
its ATM port is responsible for exercising the applicable service
specific convergence sublayer, in this case, (FR-SSCS).
Frame
Relay
Frame
Relay
Frame
Relay
Frame
Relay
ATM
ATM network
FR-SSCS
Inter-
working
function
B-ISDN
FR-SSCS
Inter-
working
function
B-ISDN
CPE
CPE
Frame
Relay
Frame
Relay
Frame
Relay
ATM network
FR-SSCS
Inter-
working
function
B-ISDN
CPE
exercises
appropriate
SSCS
B-ISDN
FR-SSCS
ATM network
Service
interworking
function
Frame
Relay
Frame
Relay
ATM
CPE using a
standard, non-
service specific
convergence
protocol
H8226
CPE