40-7705ii-UM
Page 77
Rev 1 June 11, 2018
Function
Explanation
RADIO PACKET LIFE
• Press <ALT> + <P>
• Press <R>
• Select Target Unit
• Select Route
• Edit form as necessary
See below for details on data entry for this function:
Radio Packet Life – Data Entry Screen:
Version 2.1 subscribers include the “Time-To-Live” (TTL) function. Like
the Internet, AES IntelliNet uses a packet-based technology. The Time-to-
Live concept in the Internet is based on the fact that all data has a useful
life.
The benefits of TTL are best exhibited when the IP-Link goes off line due
to a lightning hit or some other unlikely, catastrophic event. While the IP-
Link is off line, messages traveling through the system are stored in the
individual subscriber units for later delivery. Under the default TTL
settings unimportant test timer message (typically 95+% of the traffic) are
deleted from the subscriber unit memory after 30 minutes of being delayed
in the network. Thus, the system will not have to handle the message
when the IP-Link Receiver comes back on line. All other messages, such
as alarm, etc. speed their way to the IP-Link as they normally do.
UL864 requires a setting of 0 for Alarm, Trouble and Restoral.
• Note that even when a check-in packet is deleted due to a delay,
the objective of that message has already served its purpose: the
late or missing signal should have been flagged at the central
station (see Automatic Test Supervision section).
• Under the default (factory) settings, only test timer messages are
subject to the TTL function. If you want TTL for other message
types, YOU must activate it when you program the subscriber unit.
• The TTL time is included in packets generated by TTL capable
Subscribers. This feature is available in Subscribers with firmware
Version 2.1 and later which was first released in late 2000.
Figure 11-14
Radio Packet Life