data applications, which are tolerant of delay and cell loss. AAL5 does not provide for error
recovery and cell retransmission. This trade-off results in smaller bandwidth overhead and
faster processing.
supports prefix routing for public and private networks and supports an address hierarchy. PNNI
uses message flows to establish point-to-point and point-to-multipoint PVCs and SVCs. PNNI
signaling controls the cell stream between nodes and networks.
signaling between switches from multiple vendors. The requirement to manually configure its
prefix tables limits its applicability to networks with only a small number of nodes. The
significance of IISP has diminished since the release of PNNI.
ATM address allocation, keep in mind the following:
addresses should be globally unique. To satisfy the uniqueness requirement, a number of
registration authorities administer ATM addresses. ATM addresses are distributed in sets with
a common prefix. The registration authority ensures the uniqueness of the prefix. The recipient
allocates the remaining part of the ATM address to devise an addressing scheme that is
appropriate for the private network. The recipient has to assign the remaining address part in a
way that creates a set of unique addresses. If these guidelines are followed, private ATM
networks can achieve global ATM interconnection without the need to renumber the addressing
scheme.
private networks, ATM uses Network Service Access Point (NSAP) addresses. For public
networks, ATM uses E.164 addresses.