HP CommonIO Products Bedienungsanleitung PDF herunterladen (Seite 19)

About the X.25 Product

Transport Level (L4)

Chapter 1 19

Transport Level (L4)

At the transport level (level 4), the X.25 link provides TCP (based on the

DARPA standard) and UDP. These Transport level protocols are used by

Internet/Berkeley Services, by NS, and by user application programs

that access the TCP/UDP and IP protocols.

The TCP protocol is a connection-based protocol. TCP verifies that all

data is delivered without duplication to its destination. The UDP

protocol, unlike TCP, has no concept of a connection. Messages are sent

as a unit with source and destination information in the header.

The X.25 link provides a BSD to PLP (Packet Level Protocol) translator

to allow access to PLP at level 3 for user-written application programs

via BSD IPC.

The X.25 link also provides an OTS to PLP translator to allow access to

PLP at level 3 for OSI Services via Xport OSI.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 260 261

Keine Kommentare

HP CommonIO Products Bedienungsanleitung Seite 19