P/N 1070334 (ML) • REV A • ISS 04AUG14
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The first alarm device (default) on the S0 bus will get the TEI
value 1 (in Belgium) or 2 (The Netherlands), the second alarm
device (optional) will get the TEI value 11 (in Belgium) or 12 (in
Netherlands), etc. This TEI value needs to be programmed by
the installer in menu 19.9.
ATS7120
The ATS7120 uses the ISDN B-channel for communication
with the alarm processing system or for up and download
panel programming. The ATS7120 is designed for Point to
Multi Point configurations as well as Point to Point
configurations
ATS7121
The ATS7121 uses the ISDN D-channel for communication
with the alarm processing system.
The principle of D-channel communication in an intrusion
environment is related to a special service on a BRI ISDN line,
which will be provided by the local Telephone Company. This
service gives access to the so-called X-25 network and is
available in a number of countries of Europe, for example:
Netherlands:
Digi-Access Alarm
(300 bps)
Digi-Access Standard
(9600 bps)
Belgium:
D-Watch
(300 bps)
D-Watch Pro
(9600 bps)
The Central Station to which the ATS7121 will be connected
must order this special service. With this service the D-channel
can have access to a Closed User Group (CUG).
The X25 Enai protocol is able to use the X25 D-Bit. This
reduces the number of packets that is transmitted, and thus
transmission costs. The availability of this feature depends on
the network. Currently it is supported (X25 D-Bit set to Yes) in
the Netherlands. In Belgium the option X25 D-Bit shall be set
to No.
On parallel the ATS7121 has the possibility of using one ISDN
B-channel for up and download panel programming, or B-
channel alarm reporting to the Titan Management package.
One B-channel will always be available for other applications
such as phoning and faxing.
The alarm processing system receives alarms of the ATS7121
via an X.25 receiver.
The ATS7121 sends test reports continuously. If the X.25
receiver
doesn’t receive the test reports anymore, a
communication fall-out is immediately passed on to the
processing system.
Encryption (ATS7121)
Messages to the alarm processing system are encrypted. Even
messages with the same contents will differ each time during
transportation.
EURO-ISDN Compliancy
The ATS7120/7121 ISDN complies with the CTR3 A1 (EURO-
ISDN) standard for the following usages:
•
Automatic dialling
•
Multiple repeat attempts
The ATS7120/7121 ISDN is also capable of the following:
•
Automatic call initialization
•
Automatic answering
Any usage other than those approved, or failure to comply with
the installation and programming instructions may invalidate
any approval given to the apparatus if, as a result, the
apparatus ceases to comply with the standards against which
approval was granted.
Connecting to ISDN
The ATS7120/7121 ISDN dialler is connected to the ISDN
network via an NT1 (Network Terminator 1). This NT1 is part of
the local Telephone Company equipment and therefore always
installed by that company. The physical connection between
the NT1 and the ATS7120/7121 ISDN is by a standard RJ45-
RJ45 cable, as described by the ISDN specifications.
Figure 4 legend
Item
Description
1
On site
2
Central station receiver
R
Termination resistor (2 x 100
Ω)
T
ISDN terminal (e.g. ISDN phone)
TA
Terminal adapter (e.g. ISDN to PSTN)
T’
e.g. PSTN phone
NT1
ISDN termination device
S0
Incoming ISDN from NT1
S0’
To other ISDN devices
Connecting to NT1
Usually an NT1 is equipped with two RJ45 outlets that can be
used simultaneously when connecting the ISDN terminals. For
security applications, however, the second outlet should never
be used. If the second RJ45 plug of the NT1 is used, the
priority switch of the dialler will not be able to guarantee a free
B-channel for the dialler as the priority switch only affects the
terminals connected to the S0 out connector of the dialler.
Connection built-up (ATS7120)
The ATS7120 can only make use of B-channel transmission
although the connections will be established by the D-channel.
A total of 4 central stations can be programmed, each
supporting a main telephone number and a back-up number.
Each central station can be configured for different areas and
alarm protocols. Even voice reporting is supported (see also
the installation manual of the optional voice module ATS7200).
Note:
For more details, see the Advisor Master programming
manual.
Connection built-up (ATS7121)
The ATS7121 can make use of D-channel transmission as well
as of B-channel transmission for alternative reporting. For D-
channel transmission, a polling mechanism can be set to
90 seconds or 15 minutes.
When this polling mechanism fails, the central station takes
action to inform the customer.