Uniden EXP1240 manual Introduction, Timing Levels, System Chain ID and RPN

EXP1240 System Installation Guide Revision 06

Multiple Base (Multi-cell) Systems

Introduction

To install a EXP1240 system with more than one base, you must configure it as a multi- cell system. This section explains how to configure multi-cell systems. For detailed information on multi-cell operation and the difference between single and multi-cell systems, see the Network Planning Guide.

Timing Levels

•In multi-cell systems, one base station serves as the primary synchronization source for all the other base stations. This base station is considered at timing Level 0.

•Base stations at Level 1 get their timing directly from the primary base station. (These must be in range of the primary base station.)

•Base stations at Level 2 get their timing from base stations at Level 1. Base stations at Level 3 get their timing from base stations at Level 2, and so on.

•Level 6 is the maximum timing level.

System Chain ID and RPN

To enable base stations to recognize members of the same system, each multi-cell system requires a separate system chain ID number. All base stations that share a system chain ID will function as part of the same multi-cell system.

Within the system chain, each base station is automatically assigned an RPN identification number. When you select a synchronization source for each base station, you will use the source's RPN to identify it.

•The system assigns the RPN based on the order in which the base stations are added to the chain. For example, the first base station added to the chain (usually the primary) is assigned an RPN of 00, the second base is assigned an RPN of 04.

•If you want the base stations to appear in a particular sequence, add the stations to the chain in that order.

Figure 21 shows an example of a multi-cell system, and Table 5 summarizes the parameters for this example. This information is used throughout the instructions.

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