RFC 2761 (rfc2761) - Page 3 of 32

Terminology for ATM Benchmarking

RFC 2761            Terminology for ATM Benchmarking       February 2000


   reference.  The key words "MUST", "MUST NOT", "REQUIRED", "SHALL",
   "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and
   "OPTIONAL" go in this document are to be interpreted as described in
   RFC 2119.

Definitions

   The definitions presented in this section have been divided into two
   groups.  The first group is formal definitions, which are required in
   the definitions of the performance metrics but are not themselves
   strictly metrics.  These definitions are subsumed from other work
   done in other working groups both inside and outside the IETF.  They
   are provided as a courtesy to the reader.

1. Formal Definitions

1.1. Definition Format (from RFC 1242)

   Term to be defined.

   Definition: The specific definition for the term.

   Discussion: A brief discussion of the term, its application and any
   restrictions on measurement procedures.  These discussions pertain
   solely to the impact of a particular ATM parameter on IP or TCP;
   therefore, definitions which contain no configurable components or
   whose components will have the discussion: None.

   Specification: The working group and document in which the terms are
   specified and are listed in the references section.

1.2.  Related Definitions

1.2.1. ATM Adaptation Layer (AAL)

   Definition: The layer in the B-ISDN reference model (see B-ISDN)
   which adapts higher layer PDUs into the ATM layer.

   Discussion: There are four types of adaptation layers: AAL 1: used
   for circuit qemulation, voice over ATM AAL2: used for sub-rated voice
   over ATM AAL3/4: used for data over noisy ATM lines AAL5: used for
   data over ATM, most widely used AAL type









Dunn & Martin                Informational