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Cajun P550/P880 ATM Uplink User Guide, Version 1.1
G-7
Multicast Frame An Ethernet frame transmitted with a multicast destination address;
it is intended to be received by one or more endstations. In this
documentation, a broadcast frame is considered a multicast frame.
Multiprotocol
Encapsulation
Over ATM
Enables higher-layer protocols, such as IP or IPX, to be routed over
ATM by enabling an ATM-aware device or application to add a
standard protocol identifier to LAN data.
Multiprotocol Over
ATM (MPOA)
A proposed ATM Forum specification that defines how ATM traffic is
routed from one virtual LAN to another. MPOA is key to making
LAN emulation, Classical IP over ATM, and proprietary virtual LAN
schemes interoperate in a multiprotocol environment.
Network Control
Protocols (NCPs)
Establishes and configures different network-layer protocols.
Network
Interworking
A method of connecting two frame relay devices over an ATM
backbone network. In network interworking, ATM devices are
essentially pass-through devices; all frame relay header and payload
data is preserved as is. This is in contrast to service interworking,
where protocol conversion is used to connect frame relay and ATM
networks. Network interworking is defined in the Frame Relay
Forum’s FRF.5 spec and is recognized by the ATM Forum.
Network Service
Access Point
(NSAP)
An OSI format defining a 20-byte format network address; also used
in ATM networks. Current ATM specifications define the
International Telecommunication Union’s E.164 standard for public
networks and NSAP for private networks, but some ATM users and
vendors want to standardize on NSAP addresses for all devices. The
NSAP format includes a 13-byte address prefix that can be used to
describe a specific location (including country, area, and end
system).
Network-to-
Network Interface
(NNI)
Interface between ATM network nodes (switches) defined in the
ATM Forum’s UNI (User Network Interface).
OAM Operations Administration and Maintenance (OAM).
Optical Carrier
(OC-n)
Fundamental unit of the SONET (Synchronous Optical Network)
hierarchy. OC indicates an optical signal and n represents
increments of 51.84 Mbits. Thus, OC-1, OC-3, and OC-12 equal
optical signals of 51, 155,and 622 Mbits, respectively.
Organization
Unique Identifier
(OUI)
The most significant 24-bits of an endstation’s MAC address;
contains the vendor ID name assigned by the IEEE.