User's Manual

62 MDS TransNET I&O Guide MDS 05-2708A01, Rev. D
9.7 Low-Power Mode versus Remote’s Sleep Mode
The Low-Power Mode (LPM) puts Remote radios into an operational config-
uration similar to Sleep, but there are some important differences. Below is a
comparison of the two modes.
9.8 Mobile Operation Support
Introduction
Reliable mobile operation of Remotes is practical in areas covered by
multiple Master Stations within the same network—Master stations with the
same Network Address (ADDR). To make this type of service practical, the
Remote must have several reliable Master stations with which to communi-
cate.
A “reliable” Master is defined as one, which consistently matches, or
exceeds, the Remote’s standard for Minimum RSSI (MRSSI).
Initially, the Remote will favor Masters with signal strengths 10 dB greater
than the MRSSI threshold. This will allows for some signal degradation of the
new Master as the Remote travels.
When the average signal level from the currently-associated Master falls
below the user-defined MRSSI level, the Remote will become out-of-sync
and seek an alternate Master with a reliable signal.
Table 25. Power-Conservation Modes Comparison
Sleep Mode Low-Power Mode
Features • Manual control by
connected equipment
• Selective application of
Sleep control
• User determines length and
frequency of sleep periods
• Automatic radio-controlled timing
• Automatic sleep during absence of
directed traffic
• Network-wide implementation
through Master station
Benefits • Low latency
• Low standby power,
≤ 3 mA at 13.6 Vdc
• Greatest potential for power
savings
• Less complicated implementation
• Simple configuration