HP 3000 Manuals

Installing and Configuring HP X.400 Administrator's Guide

Management Domains 

The MTS may also be divided into domains which consist of one or more
MTAs and zero or more UAs controlled by the same authority.  If the
authority controlling a domain is a PTT (Public Telegraph and Telephone),
the management domain (MD)is called the ADMD (Administration Management
Domain).  If the authority controlling a domain is an organization, the
management domain is called the PRMD (Private Management Domain).  The
ADMD/PRMD is responsible for the registration of each UA in the domain.

Administration Management Domain 

An ADMD defines the boundariesin which a group of MTAs are owned and
managed.  ADMDs are typically providers of public services.  In Europe,
the function of Administrations is usually performed by the national PTTs
resulting in one ADMD per country.  In the U.S., however, there are
multiple Administrations.

Private Management Domain 

A PRMD defines the boundariesin which a group of MTAs are owned and
managed by a private organization.  For example, a collection of
computers running E-mail owned by a corporation forms a PRMD. The private
categorization allows some or all of the computers located within the
PRMD boundary to manage proprietary message delivery.  However, any
messages which are transferred across the PRMD boundary to another domain
must be transferred by the MTA using X.400 standard protocols.  One
restriction is that a PRMD may not be used to relay a message
betweenADMDs.

Figure 2-4 presents a sample X.400 environment and shows the management
domain boundaries.

When PRMDs utilize ADMD services (i.e., need to send/receive messages to
and from public X.400 message networks), the PRMD must be associated with
the ADMD. This is accomplished by:

   1.  Supplying the ADMD name along with the PRMD name in the address.

   2.  Providing a connection between an MTA in the PRMD and an MTA in
       the ADMD.

The ADMD name does not need to be specified in the message address when
the message will never be sent or received through a public service.
However, it is useful to include an ADMD name to allow for future
expansion.


          Figure 2-4.  X.400 ADMD and PRMD 

MPE/iX 5.0 Documentation