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Opaque data type - 추후 번역 요

Mobile 2006/01/04 10:03

출처: http://users.footprints.net/~kaz/kazlib_doc/node13.html

A data type whose precise definition is not documented, and which is intended to be manipulated only using the documented interface, which consists of a set of functions. Many data types in Kazlib are described as opaque. A program which bypasses the documented interfaces in inspecting or manipulating these data types invokes undefined behavior, and is not portable among Kazlib implementations.

추가 참고: http://archives.postgresql.org/pgsql-novice/2001-08/msg00072.php

* Sometimes OPAQUE means "this function doesn't return anything at all",
similarly to "returns void" in C and some other languages.

* Sometimes OPAQUE means "this value can be any datatype at all" (eg,
input of the count() aggregate).

* Sometimes OPAQUE means "I know exactly what this should be, but it's
an internal datatype with no SQL-level equivalent". This is usually
what's at stake with a trigger function.

* Sometimes OPAQUE means "I know exactly what this should be, but I
haven't declared it yet" (ie, a forward reference). This is needed
to declare I/O functions of user-defined types, since the system
requires the functions to already exist when the type is declared.

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PDU / SDU - 추후 번역 요

Mobile 2006/01/03 11:56

출처:
http://www.atis.org/tg2k/_protocol_data_unit.html
http://www.atis.org/tg2k/_service_data_unit.html

protocol data unit (PDU): 1. Information that is delivered as a unit among peer entities of a network and that may contain control information, address information, or data. 2. In layered systems, a unit of data that is specified in a protocol of a given layer and that consists of protocol-control information of the given layer and possibly user data of that layer.

service data unit (SDU): In layered systems, a set of data that is sent by a user of the services of a given layer, and is transmitted to a peer service user semantically unchanged.

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WSP/B and WSP

Mobile 2005/11/18 10:03

출처 - http://www.javacommerce.com/displaypage.jsp?name=wap_intro2.sql&id=18262

III. The Session Layer: WSP/B and WSP

The WAP Session Protocol/B, WSP/B, is a stateless, binary protocol patterned after the HTTP World Wide Web protocol. It consists of a simple request-response pairing. WSP/B contains fields that describe the contents, origin, and types of the request or response contents. There is a one to one correspondence with a subset of the HTTP 1.1 fields. No state information is maintained between requests. WSP uses the WAP Datagram protocol directly for communication with WAP clients.WSP/B is sometimes called WAP connectionless mode.

The WAP Session Protocol, WSP, is a session oriented, stateful binary protocol used in conjunction with WTP. WSP is a superset of WSP/B and uses the same fields of information. WSP also defines additional protocol formats to support sessions initiation, suspenion, and resumption and to maintain session state information. A session is initiated by a WAP client and is maintained until it is explicitly disconnected. WSP sessions can be suspended and resumed and can even switch WDP bearers mid-stream. All WSP information is exchanged using the WAP Transaction Protocol, WTP, described below. WSP is often referred to as WAP connected mode.

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Push/Pull 개념

Mobile 2005/11/07 09:52

* Push
- 서버가 컨텐츠를 전송하기 전 클라이언트로부터의 어떠한 요청이 없음
- 서버가 시작함
ex) WAP Push

* Pull
- 클라이언트가 서버에게 서비스나 정보를 요청
- 서버는 클라이언트에게 해당하는 서비스나 정보를 반환
- 클라이언트가 시작함
ex) WWW

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store-and-forward

Mobile 2005/10/25 09:32

참조: http://www.atis.org/tg2k/_store-and-forward.html

store-and-forward (S-F): Pertaining to communications systems in which messages are received at intermediate routing points and recorded i.e., stored, and then transmitted, i.e., forwarded, to the next routing point or to the ultimate recipient.

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PDU

Mobile 2005/10/21 11:55

PDU

Short for Protocol Data Unit, PDU is information delivered through a network layer. For the network to understand which layer is being discussed, a single-letter prefix is added to the PDU.

LPDU - Communication for the data link layer.

NPDU - Communication for the network layer.

TPDU - Communication for the transport layer

Also see: BPDU, Network definitions, OSI, SDU

참고사이트> http://www.dreamfabric.com/sms/

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용어 정리

Mobile 2005/09/23 10:53

- application protocol data unit (APDU)

A command sequence (an Application Protocol Data Unit) that can be sent by the smart card or returned by the application.

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