Honeywell Galaxy Flex Installer Manual page 138

Communications [56]
Use this option to select the type to be used.
1=Point to Multipoint (default)
Use this configuration when more than one ISDN system is connected to the ISDN bus. To
ensure that the ISDN module responds to incoming calls from Remote Servicing only a
specific MSN (Multiple Subscriber Number) should be entered. The MSN number should be
provided by the Telecom provider.
Note: All devices not programmed with an MSN number will also respond to incoming
calls.
2=Point to Point
Only one device is allowed on the ISDN bus. In this configuration a TEI number must be
programmed. The default is 0. Since only one device is allowed the ISDN module will act
differently when programmed to Point to Point.
The hardware ISDN snatch relay is always activated before the module starts a dialling
sequence. After all the alarms are transmitted the relay will be deactivated and the customer
PABX, if connected, will be connected to the ISDN network again. During the dialling
sequence it is not possible to use the PABX for an outside call.
Upon an incoming call for the module, the relay will be activated directly switching the
PABX off the ISDN line, after which the ISDN module will seize the line. To ensure correct
functionality of the PABX and the ISDN module always connect the PABX to the ISDN out
ports.
The phone numbers that are available on a Point-to-Point line often only vary in the last 2
digits e.g.123401 ~ 123409. To handle incoming calls from Remote Servicing one phone
number need to programmed into the ISDN module. This specific phone number cannot be
used by the PABX because the ISDN module will seize the incoming call directly.
Note: X.25 in combination with a Point-to-Point ISDN line is not possible.
ISDN Snatch [56.3.04]
In order to ensure maximum security the ISDN Module must be able to make a call in every
circumstance. The ISDN Module offers both hardware and software line seizure options.
1=Hardware
The hardware snatch is performed using a relay. This relay can switch the other devices off
when the ISDN Module needs to communicate. In order to switch the other devices off it is
important that these other devices are connected to the ISDN out connection of the module.
Some ISDN devices are not willing to release a B-channel even when the network indicates
that the B-channel must be released. When this is detected or a tamper causes interference
on the ISDN bus communication the relay will be activated.
A number of configurations are available for the hardware snatch function.
1=Always Snatch
2=Never Snatch
138
A hardware snatch is always attempted irrespective of the
software snatch programming.
A hardware snatch is never attempted.
Galaxy Flex Installer Manual