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Frame Relay to ATM Network and Service Interworking 12-5
Networking Interworking
Figure 12-5 Frame Relay to ATM NW Interworking Detail
S6166
Physical
ATM
SAR
CPCS
Upper
layers
B - CPE
Physical
ATM
BNM
Physical
ATM
BNI
Physical
ATM
BNI
Physical Physical Physical
ATM
SAR
CPCS
Fr Rly
Q.922
Q.922
Upper
layers
FRSM
FR CPE
AXIS shelf
Physical Physical
Fr Rly
FrRly
ATM T3/E3
feeder trunk
ATM T3/E3
ATM T3/E3
feeder trunk
Q.922
Physical
Q.922
Frame
Relay
Fast
Packet
Frame
Relay
Fast
Packet
Physical
Frame
Relay
Fast
Packet
Physical
Frame
Relay
Fast
Packet
FRP
Physical
ATM
ATM
AAL-5 SAR
AAL-5 SAR
CPCS
Physical
FR-SSCS
FR-SSCS
Physical
CPCS
FR-SSCS
FR-SSCS
AIT
AIT
FRP
MUX
BUS
IPX shelf
BPX
IPX
ATM
T3/E3/
OC3
feeder
trunk
One IPX must be a shelf for an
interworking connection when the
frame relay connection endpoints
both terminate on a IPX, otherwise,
the connection will be a simple gateway
connection. (The same applies to an IGX)
Narrowband NWNarrowband NW ATM NW
Narrowband NW
Part A. Network interworking, Frame Relay CPEs connected across an ATM network
Part B. Network interworking, Frame Relay CPE connected to B-ISDN CPE across an ATM network
ATM NW
MUX
BUS
Physical
ATM
ASI
Physical
ATM
BNI
ATM T3/E3
Physical
Q.922
Physical
Frame
Relay
Fast
Packet
Physical
Frame
Relay
Fast
Packet
ATM
AAL-5 SAR
Physical
CPCS
FR-SSCS
BPX
IPX shelf
Physical
Q.922
Upper
layers
FR CPE
Fr Rly
Physical
Q.922
Upper
layers
FR CPE
Fr Rly
Physical
Q.922
Upper
layers
FR CPE
ATM T3/E3
AIT
FRP
IPX
MUX
BUS