Installing and Administering OSI Transport Services

Chapter 1 59
HP OTS/9000 Resources
Current NSAP Allocation Formats
Unlike ANSI and AFNOR, which defined an AP and left the PAP
undefined, MAP/TOP has defined a general format for the PAP portion.
Their PAP may be used with any valid AP.
MAP/TOP has decided to use subnetworks as their level of routing rather
than areas. This is more in line with present ARPA routing procedures
than the upcoming ISO routing protocols. MAP/TOP does recommend
that the customary 2/6/1 field lengths be used for the PAP portion to
allow easy migration to area-based routing in the future.
A more complete discussion of this addressing format may be found in
Manufacturing Automation Protocol Specification, Version 3.0, available
from the MAP/TOP users group:
North American MAP/TOP Users Group ITRC P.O. Box 1157 Ann Arbor,
MI 48106 USA