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P/N 1070334 (ML) • REV A • ISS 04AUG14
5
EN: Installation Sheet
Introduction
General
This installation guide describes the installation of:
•
ATS7120 ISDN B-channel dialler
•
ATS7121 ISDN D-channel transmitter and integrated
ISDN B-channel dialler Installation and Troubleshooting
Guide
ISDN Definitions
ISDN (Integrated Services Digital Network) is a system of
digital phone connections that allows data to be transmitted
simultaneously across the world using end-to-end digital
connectivity.
With ISDN, voice and data are carried by bearer channels (B
channels) occupying a bandwidth of 64 Kbps (bits per second).
A data channel (D channel) handles signalling at 16 Kbps or
64 Kbps, depending on the service type. There are two basic
types of ISDN service: Basic Rate Interface (BRI) and Primary
Rate Interface (PRI).
•
Basic Rate Interface (BRI): See Figure 3, item 1. BRI
consists of two 64 Kbps B channels and one 16 Kbps D
channel for a total of 144 Kbps. This basic service is
intended to meet the needs of most individual users.
•
Primary Rate Interface (PRI): See figure 3, item 2. PRI is
intended for users with greater capacity requirements.
In Europe, PRI consists of 30 B channels plus one 64
Kbps D channel for a total of 1984 Kbps.
The ATS7120 and ATS7121 diallers are designed for use on
the BRI (ISDN-2).
Signalling
Instead of the phone company sending a ring voltage signal to
ring the bell in your phone ("In-Band signal"), it sends a digital
packet on a separate channel ("Out-of-Band signal"). The Out-
of-Band signal does not interfere with established connections.
No bandwidth is taken from the data channels and call setup
time is quick. An ISDN call setup usually takes less than
2 seconds.
The signalling also indicates who the caller is, what type of call
it is (data/voice), and what number was dialled. Available ISDN
phone equipment is then capable of making intelligent
decisions on how to direct the call.
Point to Multipoint Configuration (PTMP ATS7120 /
ATS7121)
PTMP configurations are most common in a standard BRI
ISDN network (also called ISDN-2).
The maximum number of ISDN terminals that can be
connected to a BRI line is eight.
Point to Point Configuration (PTP only for ATS7120)
PTP configurations are used when only one ISDN terminal is
connected to the ISDN network. In most cases, the connected
device will be a PABX.
Note:
The ATS7120 must always be connected before the
PABX.
ISDN TEI values
It is possible to connect up to 8 devices to the ISDN S0 bus
(PTMP). The NT1 keeps track of these devices by using the
Terminal Endpoint Identifier (TEI). This TEI is an identification
number that can have the following values:
•
0-63: Fixed TEI (programmed by user)
•
64-126: Automatic TEI (assigned by the NT1)
•
127: Group TEI (message from NT1 to all devices)
When using the ATS71xx in a Point-to-Multipoint configuration
for reporting using the analogue protocols (like SIA, Contact
ID), it will get a TEI value automatically. This TEI value can be
any value between 64 and 126.
In a Point-to-Point configuration there can only be one device
(application) on the bus, so there will be only one TEI value.
This TEI value for a Point-to-Point configuration is 0 (fixed).
For X25 over D-channel reporting, fixed TEI values are used.
The used values are country dependent.
TEI Value
Netherlands
Belgium
1, 11, 21
Digi-Access PIN (Interpay) ISDN D-Watch
2, 12, 22
Digi-Access Alarm
ISDN-D Commerce
(BankSys)
3, 13, 23
Digi-Access Standard
IC3
RL2
RL1
CONN3
S
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a
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A
0
S
0
M
O
N
LED 3
LED 2
LED 1
M
I
L
E
D
CONN4
ATS7100
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