Cisco Systems manual 12-2Cisco BPX 8600 Series Reference

Figure 12-1 Frame Relay to ATM Network Interworking

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.

Frame Relay

CPE

Frame Relay

Inter-

working function

B-ISDN FR-SSCS

ATM network

Inter-

working function

B-ISDN FR-SSCS

Frame

Relay

CPE

Frame Relay

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

CPE

Frame Relay

Inter-

working function

B-ISDN FR-SSCS

		CPE
		exercises	Frame
	ATM	appropriate	Relay
ATM network		SSCS
		B-ISDN
		FR-SSCS	H8225

Figure 12-2 Frame Relay to ATM Service Interworking

Frame		Frame				CPE using a
			Service			standard, non-
Relay		Relay			ATM
	CPE
			interworking	ATM network		service specific
			function			convergence
						protocol

H8226

12-2Cisco BPX 8600 Series Reference