User's Guide

MBS-LP User Guide Document MBUD-0087v0.2
Proprietary and Confidential 9/14
MBS2-LP supports ad-hoc mode for communications with a CSC, or infrastructure mode for
communications with an Access Point in an In-Yard Communications situation.
The MBS2-LP also has the capability to use the Wireless Tether to communicate with CSCs that
use a sleep mode for power conservation. See the Magic Packet section for details.
GPS Receiver
The GPS receiver option includes a GPS receiver and a separate patch antenna.
The GPS receiver is a Lassen LP, manufactured by Trimble. It measures position with an
accuracy of 25 meters
1
, velocity accurate to 0.1 meters/sec, and time accurate to 95 nano-
seconds.
The GPS information can be used by the Wireless Matrix AVL application, the application running
on the CSC, or another User Application stored on the MBS2-LP.
The CSC application can access GPS information through command server primitives (refer to
MBS Command Reference Document for details).
Keyfob Receiver
For Alert and Personal Alert features, the MBS2-LP uses a 315 MHz keyfob receiver and
inverted-F antenna. An external keyfob transmitter is also provided.
FEATURES
Multi-Network Routing
The Multi-Network Routing (MNR) function enables the MBS2-LP to send communications over
the best available network, as determined by a “Primary Network” setting and the coverage
situation. The routing algorithm is based on a parameter called the “Active Network”, and is
explained in the sections below.
The MBS2-LP is configured during Commissioning to have a “Primary Network”, or a preferred
network. The MBS2-LP will always use the Primary Network as the Active Network when within
Primary Network coverage. The Secondary Network will become the Active Network only if no
Primary Network coverage is available.
For instance, if the Primary Network is satellite, and the MBS2-LP is in satellite coverage, the
Active Network for the MBS2-LP is satellite. If the MBS2-LP leaves satellite coverage but is still
in terrestrial wireless coverage, the Active Network would become terrestrial.
Active Network (AN) Determination
The MBS2-LP periodically evaluates the Satellite and GPRS Network coverage and updates its
Active Network based on a predefined Active Network Algorithm (not to be confused with the
1
Subject to Selective Availability (SA)