7.14 Host Link Interface (CSTA Interface)
Definition
The Hicom 150 E Office system and the applications running on the host computers (Plus products)
communicate via a V.24 system interface (2400/9600 bauds) or an S
0
interface configured as an
extension.
Up to and including Release 2.1 of the Hicom 150 E system, the two systems communicated on the
basis of the ACL-H2 protocol. With the introduction of the Hicom 150 E Office system, the CSTA
Phase II protocol (Computer Supported Telecommunications Applications) standardised by ECMA
was implemented.
In order to be able to continue supporting Plus Products on an ACL-H2 basis, a so-called converter
with the following tasks must be integrated:
Hicom 150 E Office direction: all messages and message procedures known from the ACL-H2
protocol must be converted into the CSTA protocol.
Plus Product direction: conversion of the CSTA protocol into messages and message
procedures of the ACL-H2 protocol.
The converter is implemented as a driver, which can run under MS-Windows 95. The interfaces V.24,
X.75 (B channel access) and EDSS1 (USBS) are supported.
Figure 7-4 Host Link Interface, converter principle
Model-Specific Data
Subject OfficePro OfficeCom OfficePoint OfficeOne
Feature available in x x - -
HW requirements - - - -
SW requirements As of Rel. 1.0 As of Rel. 1.0 - -
Max. number of applications 4 4 - -
Hicom 150 E Office Rel.1.0 Service Manual - 7.14 Host Link Interface (CSTA Interface)
http://cmweb01.mch.pn.siemens.de/e_doku/en/h150/h15/30/sh/2/15_714.htm (1 of 3) [06/04/2000 13:12:03]
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