FRADSWITCH-8A, FRADSWITCH-16A, FRADSWITCH-24A
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The Fradswitch supports four call-initiation methods, independently selectable for each channel.
1) Manual (regular) call initiation, whereby the user provides all the information required to set
up the call by entering an X.28 command.
2) Mnemonic call initiation, whereby the user need only enter a mnemonic (call ID). The channel PAD
then retrieves the call-setup information from the Fradswitch’s memory.
3) Automatic call initiation (autocall). The call is automatically initiated as soon as the user equipment is
turned on, in accordance with predefined call-setup information stored in the Fradswitch’s memory. To
completely automate the call setup, a user-defined sequence of X.28 commands (alias) can automatically
be sent after the call is set up. The sophisticated Fradswitch autocall mode includes two measures that
allow for the reliable setup of the desired call:
Automatic call setup retry: the user can specify the number of retries, and the interval between
consecutive retries.
An alternative address for call setup that is automatically used when it is not possible to set up
a call to the first address.
4) Use of permanent virtual circuit (PVC). The call is automatically set up by the X.25 network switch,
in accordance with predefined call-destination data requested at subscription time.
2.10 ITU Facilities
The ITU X.2 facilities supported by the Fradswitch series are:
• Closed user groups
• Fast select
• Reverse charging
• Throughput class negotiation
• Packet and window size negotiation
• Charging information
• Network user identification (NUI)
2.11 Command Facility Features
The Fradswitch series channel PADs operate under the control of a central command facility.
The command facility can be used to perform the following activities:
• Set up the individual channel PAD configuration parameters
• Determine common Fradswitch configuration parameters
• Perform statistics and performance monitoring on the Fradswitch and its channels
• Perform diagnostic activities