What Is an Administrative Domain?

A management domain is a collection of resources. The behavior within a domain is subject to a system management policy. A group of logical units managed by an administrative department or organization is a management domain (MD), which is divided into a public management domain (ADMD) and a private management domain (PRMD). ^[1]

MD includes one or more

Route management is divided into management within the management domain and management between the management domains.

1. Intra-domain routing management

Intra-domain routing management is performed by the master MTA. The administrator sets and modifies routing parameters and routing control tables. The same routing algorithm is executed in the management domain. The routing database should contain information about the communication nodes, information about EDI-UA, information about MTA, routing rules, and routing algorithms.

(1) EDI-UA information

EDI UA information is created when a user requests the system, or it can be created by a system administrator. In the routing database. EDI-UA contains the following information:

Mailbox name;

Password

The EDI standards used;

The character set used;

· Services selected by the user.

(2) Information of MTA

The information of the MTA includes information of the MTA itself and information of connection with other MTAs.

The MTA itself includes the following information:

MTA name;

The name of the ADMD or PRMD to which the MTA belongs;

· MTA administrator.

The following information is included in the MTA's connection with other MTA:

How to establish connections with other MTAs;

Information about connecting with other MTAs;

· The types supported by other MTA connections and their corresponding parameters.

(3) Routing rules

The routing rules in the management domain should be consistent. Routing follows the following principles:

· Minimal resources used;

· Minimal delay in transmission;

· The greatest scope for alternative choices;

The best security;

Minimal routing information must be maintained. ^[1]

A country can have several ADMDs and multiple PRMDs. Users can access ADMD in several ways.

1. The user directly interfaces with ADMI) to access the services provided by ADMI)

In EDI-UA and MTA are located in the same open system, EI) I-UA directly interacts with the MTA in this system, purchasing services and required facilities from the service provider. The EDI user terminal can be an ordinary terminal, which directly accesses ADMD to provide services through the RS-232 interface and modem and simple interface procedures. ^[1]

2. MDA interface provided and managed directly by AD-MD through EDI-UA

EDI users who have their own EDI-uA can directly interface with the MTA provided and managed by ADMD or the EDI-MS interface provided by AD-MD through EDI-UA. ^[1]

EDI users who have their own EDI-UA. EDI-UA replaces EDI users to participate in EDI communication, helping to draft, edit, translate, send, retrieve and receive messages. EDI-UA and MTA are located in different open systems. At this time, EDI-UA is accessed through Pedi, P3 or P7 protocols MTS or EDI-MS. ^[1]

3 By X. 25 packet network and MTA interface provided by ADMD

EDI users who have their own EDI-UA, through X. The 25 packet network interfaces with the MTA provided and managed by ADMD, or with the EDI-MS interface provided by ADMD. ^[1]

EDI-UA in this case is called EDI-RUA, and it passes X. 25 Access the packet network, connect with the MTA provided and managed by ADMD, or with the EDI-MS interface provided by ADMD. EDI-RUA interacts with the system where the MTA is located. It implements all seven layer protocols of OSI. ^[1]

4 EDI user interface with ADMD through telephone network and packet network

EDI users directly interface with ADMD through telephone networks and packet networks. ^[1]

5. EDI users access ADMD through the AU interface provided by ADMD

EDI users access ADMD through the AU interface provided by ADMD. It includes PTLXAU with Telex network interface, PTTXAU with 121 telematics connection, PDAU with postal service interface, and FAXAU with fax interface. ^[1]

6. EDI user on LAN and ADMD interface

EDI users on the local area network (LAN) access ADMD, which are divided into two types. One is the direct interface between LAN and ADMD through the server, and the other is the LAN server plus EDI-RUA through X. 25 Interface with MTA provided and managed by ADMD or interface with EDI-MS provided by ADMD. ^[1]

7. EDI users on satellite data circuits interface with ADMD

The EDI user on the satellite data circuit passes the master station in the satellite data circuit via X. 25 Access ADMD or directly interface with ADMD. ^[1]

8. PRMD connected to ADMD

ADMD and PRMD are interconnected through the master MTA of the two management domains. When ADMD and PRMD communicate with each other, ADMD is responsible for billing, login, quality of service, unique name, and related operations of PRMD. ADMD can also provide management functions such as fault reporting and traffic monitoring for PRMD. A PRMD can be connected to one or more ADMDs. EDI communication between PRMDs located in different countries is connected through MTA in ADMD of the two countries. ^[1]