ELSA MicroLink ISDN PCI, Руководство пользователя, Страница: 53 / 66

ISDN Connections
ELSA MicroLink ISDN PCI
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Some of these features may require a separate application to your telecommunications
provider and may be subject to additional charges.
These features will not be described in detail here, as they are not relevant to data appli-
cations with the
ELSA MicroLink ISDN PCI .
Just Skimming...? What's Important?
Here's a summary of the above which you should keep in mind when configuring your
communications equipment:
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ISDN provides a variety of communications services such as telephony, fax, data
applications, video telephony, and videoconferencing.
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You can assign different subscriber numbers to the individual devices (three
multiple subscriber numbers are available for an ISDN Basic Rate Interface).
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A normal ISDN Basic Rate Interface has two lines which you can use parallel to
one another.
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The various services report their bearer capability to other communications
devices (telephone, fax, PC). Depending on its configuration, a device can thus
accept or reject calls.
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If you are using both lines at the same time , for a data transfer for example, no
further functions can be used.
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If two devices have the same number and can accept the same services , the
“faster“ device will accept the call as a rule.
All of the following examples are presented as self-contained units. If you go through
the sections step by step, some of the material in the following explanations will strike
you as familiar.
The Basic Package––ISDN with Analog Devices
You've probably already noticed something about the description of ISDN's advantages:
Not very much emphasis is placed on the functions of the new digital terminal equip-
ment. A number of the greatest advantages of the digital network can actually be reali-
zed using “old“ analog equipment, provided that (if a/b adapters exist).
As a result, most private users do not buy a new ISDN telephone or fax machine imme-
diately after their ISDN connection has been installed, but sit back and wait for the prices
of this equipment to drop––or perhaps for the equipment itself to drop in under the
Christmas tree. In the mean time, they continue to use their old equipment.