User's Manual

Internal Encoding
RFI-148 & RFI-900 High Output Power Paging Transmitters User Manual Page 42 of 134
<header>
<footer>
Figure 17: Link test query packet format
The fields are:
• <header>: The generic header shown in Figure 14 with the type field set to 2.
• <footer>: The generic footer shown in Figure 14.
6.4 Test Functions
When internal encoding is enabled the RFI PTX can generate test messages as a simple means to confirm site
operation or perform extended site surveys.
6.5 Event Triggered Page
When internal encoding is enabled the RFI PTX can generate a pre-defined message to a pre-defined capcode
due to configured events. The current supported events are:
• Aux Input 2 Active Low (Configured in Encoder Interface menu)
• Aux Input 2 Active High (Configured in Encoder Interface menu)
The Throttle setting exists to cap the amount of pages that are sent due to page events. The PTX will mask all
events until the Throttle duration has expired for the previous event. This can act as debouncing logic if the
Aux Input 2 is connected to a switch.
6.6 Encryption
RFI-148 devices running at least 4.7 version firmware provide the ability to encrypt internally encoded
POCSAG messages. Note that only TPL pagers are currently supported. Please contact STIEN to discuss
future support of other pager manufacturers.
The core of the encryption feature runs AES-256, which is a symmetric algorithm – the same key is used to
encrypt as to decrypt – and this key must be known by both transmitter and receiver prior to becoming
effective.
6.6.1 Key Scheme
Several scenarios are catered for regarding the use of encryption keys, defined according to three parameters:
the customer’s desire to use either one or multiple keys, their freedom to use keys of their choosing and the
device to which the RFI-148 is transmitting encrypted pages. Specific scenarios and recommended
configurations are given in Table 11.
Paging Protocols -> Test
Paging Protocols -> Event