Which service is needed to bridge an ATM service to an Ethernet service?

An Epipe (Ethernet Pipe) is a point-to-point Layer 2 VPN service. A key capability of the Nokia Epipe implementation is its support for interworking between different Layer 2 technologies. To bridge an ATM service to an Ethernet service, an Epipe can be configured with one Service Access Point (SAP) defined with an ATM encapsulation type and the other SAP with an Ethernet encapsulation type. The service router then performs the necessary translation between ATM AAL5 Protocol Data Units (PDUs) and Ethernet frames, enabling seamless connectivity between the disparate networks.

A. An Apipe is a point-to-point service used to connect two ATM services, not to interwork ATM with Ethernet.
B. An Fpipe is a point-to-point service used to connect two Frame Relay services.
C. A Cpipe is a circuit emulation service for TDM traffic (like T1/E1) and is not used for bridging packet services.
E. "Bridge service" is a generic term. While a VPLS is a type of bridge service, it is multipoint. Epipe is the specific point-to-point service for this interworking function.

1. Nokia 7750 SR OS Services Guide, Release 21.10.R1, "Epipe Services" chapter, Section: "Service and SAP Encapsulations". This section details the support for different encapsulation types on SAPs within a single Epipe, including ATM and Ethernet, to facilitate interworking.

2. Nokia Data Sheet, "7750 Service Router". The data sheet lists "Ethernet and ATM interworking" as a key feature of the platform's Layer 2 VPN services.