TIA/EIA-732-404:2001

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Cellular Digital Packet Data (CDPD) System Specification Subnetwork Dependent Convergence Protocol

Published By	Publication Date	Number of Pages
TIA	2001	34

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Description

Introduction

This Part defines a protocol fulfilling the role of a Subnetwork
Dependent Convergence Protocol (SNDCP) as defined in Internal
Organization of the Network Layer [ISO-8648].

Connectionless-mode network protocols are intended to be capable
of operating over connectionless-mode services derived from a wide
variety of subnetworks and data links. In order to simplify the
specification of the protocol, their operation is defined with
respect to an abstract underlying service, rather than any
particular subnetwork service. This abstract underlying service
consists of a single SN-UNITDATA primitive that conveys
the source and destination subnetwork point of attachment
addresses, a SUBNETWORK QUALITY-OF-SERVICE parameter, and a minimum
number of octets of user data.

The Subnetwork Dependent Convergence functions providing this
underlying service are constrained by the specific characteristics
of a particular subnetwork service (e.g., CDPD Mobile Data
Link Protocol) and by the assumptions made by the
subnetwork-independent protocol providing Connectionless Network
Service (e.g., IP or CLNP). Where the services assumed by
the Network Layer do not map into the services provided by the Data
Link Layer, an SNDCP is operated to provide the required
functions.