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Introduction
1
Introduction
We are very pleased to see that you have bought a INSYS product and would like
to express our appreciation.
This documentation is valid for the product:
• POCKET ISDN-TA hardware version V2.0 or higher
1.1
Product description
•
The POCKET ISDN-TA connects a PC (or other device with serial port)
to the ISDN. It gives access to online services as the Internet,
AOL/CompuServe and T-Online and is also suitable for remote LAN
access. You can see it as a digital replacement for an analogue
modem.
To work with POCKET ISDN-TA you need
•
an ISDN Basic Rate Interface (BRI) (replacing an analogue telephone
line). The basic rate access can be ordered by your local telephone
company or PTT.
•
a PC with online software for a modem (see chapter 3)
The serial port of the PC should be capable of a data rate of up to 115.2 kbps
(230.4 kbps for Multilink PPP to increase performance). This might require an
additional PC card for older PCs.
1.2
Internet Access
There are three ways to access the Internet via ISDN:
•
by synchronous PPP or Multilink PPP
•
by bit rate adaptation V.120
•
by B channel protocol X.75
It depends on the access facilities of your Internet service provider (ISP) or
Point-of-presence (POP) which one you may use (see figure 1).
async
V.24
Pocket
ISDN-TA
PC with
Online Software
Figure 1: Usage of the Pocket ISDN-TA to access an Online Service
Software version V5.351 or higher
ISDN
Basic
ISDN network
Rate
Access
1
Online (POP) Access Server
CompuServe Access Server
T-Online Host System
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