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6 ATS7100/7110 Installation and Troubleshooting Guide
The Central Station to which the ATS7110 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 ATS7110 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
ATS7110 via an X.25 receiver.
The ATS7110 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 (ATS7110)
Messages to the alarm processing system are
encrypted. Even messages with the same contents will
differ each time during transportation.
1.4. EURO-ISDN Compliancy
The ATS7100/7110 ISDN complies with the CTR3 A1
(EURO-ISDN) standard for the following usages:
Automatic dialling
Multiple repeat attempts
The ATS7100/7110 ISDN is also capable of the
following:
Automatic call initialisation
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.
1.5. Connecting to ISDN
The ATS7100/7110 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
ATS7100/7110 ISDN is by a standard RJ45-RJ45
cable, as described by the ISDN specifications.
PSTN
ISDN
NT1
R
T
TA
T '
S0' S0
ATS7100
On site
Central station receiver
R Termination resistor
(2 x 100 Ohms)
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 (ATS7100)
The ATS7100 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).
For more details, see the ATS2000/3000/4000/4500
programming manual.
Connection built-up (ATS7110)
The ATS7110 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.
In this case even a B-channel connection can be
established. Meanwhile, the polling mechanism repeats
until the connection has come about.
Priority switching
If the ATS7100/7110 ISDN dialler is used in a
configuration with other ISDN equipment on the same
S0 bus, a fax or telephone could occupy both B-
channels when the ATS7100/7110 ISDN needs to
transmit an alarm event. Standard ISDN methods will
not allow a B-channel to be freed for the ATS7100/7110
to use.
Consequently, the current state of the active sessions
on the local S0 bus are stored in an internal database.
The ATS7100/7110 ISDN “knows” if there are any B-
channels available and also keeps a record of the
current session parameters, such as TEI, call reference
value, and the send and receive sequence numbers.
When both B-channels are occupied, the
ATS7100/7110 ISDN sends a disconnect signal on
behalf of one of the connected ISDN devices. The ISDN
network will perform further necessary actions. The
disconnect signal will be sent for the other device if
there is still no connection after five seconds. If there is
no B-channel available after another delay of five
seconds, the dialler sends a disconnect signal for both
devices. When still no B-channel is available, a timeout
will occur. As soon as there is a B-channel available,
the dialler will transmit.
6


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