Codan Radio P25 Training Guide - Manual (Page 45)

P25 RADIO SYSTEMS | TRAINING GUIDE
Chapter 3: P25 Technical Information Page 37
Location Services System Architecture
Figure 3-1 shows Tier 1 and Tier 2 architectural entities of Location Services, and the possible routing
signals throughout a Location Services system.
Figure 3-1: Location Services System Architecture
Location Information System
The Location Information System (LIS) resides outside of the standard P25 Radio System Network.
The LIS could be a GPS, a LORAN system, or some other location system. That provides location
information to the subscriber. Depending on the subscriber manufacturer’s design, the LIS may be a
part of the actual subscriber (GPS microphone or integrated GPS chipset for example).
The LIS to subscriber or MDP interface is not standardized as the LIS industry is separate from the
Land Mobile Radio Industry, as well as the LIS could be part of the subscriber itself.
Fixed
Station
Mobile Data
Peripheral (MDP)
Subscriber
Unit (SU)
RF
SUB-SYSTEM
(RFSS)
CUSTOMER
NETWORK
RF
SUB-SYSTEM
(RFSS)
Fixed Data Host (FDH)
Hosting Location Service
Host System (LSHS)
Location Information
System (LIS)
Subscriber
Unit (SU)
Location Service
Host System (LSHS)
Mobile Data Peripheral
Hosting LSHS
GPS, LORAN, etc.
E
d
E d
A A
U m U m
Tier 1
Tier 2
Tier 1
Tier 2
Subscriber
Unit (SU)