TETRA Transmission and Switching Network Planning Guide, Nokia,2002

[primig]

Nokia again,2002
Document type: Operating Procedure
Function: Delivery Operations / Network Planning

1. PURPOSE
The purpose of this document is to give guidance in TETRA transmission network planning and instructions for a standard TETRA network planning procedure
2. SCOPE
This document applies to all TETRA projects in both access and backbone transmission planning.
As the information contained in this document are confidential, this guideline is for internal use only. This document has been prepared by Nokia Network Planning department and is designed for Nokia Transmission Network Planners.

Table of contents
1. Purpose......................................................................................................................................... 4
2. Scope............................................................................................................................................ 4
3. Tetra system overview ................................................................................................................... 4
4. TETRA network elements .............................................................................................................. 7
4.1 Digital Exchanges................................................................................................................... 7
4.1.1 DXTip with basic cabinet capacity.................................................................................. 8
4.1.2 DXTip with extension cabinet 1 capacity........................................................................ 8
4.1.3 DXTip with extension cabinet 2 capacity........................................................................ 9
4.1.4 Digital Exchange for TETRA DXTTip ........................................................................... 10
4.2 Base stations....................................................................................................................... 10
4.3 Dispatcher System ............................................................................................................... 11
4.3.1 Dispatcher Workstation DWSe1................................................................................... 11
4.3.2 Dispatcher workstation-DWSi....................................................................................... 12
4.4 Network management .......................................................................................................... 13
4.4.1 Remote management connections and local management ......................................... 13
4.5 Interface Servers .................................................................................................................. 13
4.5.1 Configuration and Data Distribution Server.................................................................. 13
4.5.2 TETRA Connectivity Server.......................................................................................... 14
4.5.3 Authentication and Key Distribution system ................................................................. 14
5. Transmission Equipment.............................................................................................................. 16
5.1 Cross Connect Equipment ................................................................................................... 16
5.1.1 TRUA........................................................................................................................... 16
5.1.2 DN2 .............................................................................................................................. 19
5.1.3 Practical example of loop protection using DN2 and TRUA......................................... 20
5.2 Microwave radios ................................................................................................................. 21
5.2.1 Flexihopper................................................................................................................... 21
5.2.2 Metrohopper Microwave Radio..................................................................................... 23
5.2.3 Microwave Antennas .................................................................................................... 23
5.3 Transmission Node - Metrohub ............................................................................................ 24
6. Transmission Network.................................................................................................................. 25
7. Transmission Access network planning ....................................................................................... 27
7.1 Dimensioning criteria............................................................................................................ 27
7.2 Network Topologies and media............................................................................................ 27
7.2.1 Point-to-point/Star ........................................................................................................ 28
7.2.2 Multidrop chain ............................................................................................................. 29
7.2.3 Concentration points .................................................................................................... 29
7.2.4 Multidrop loop............................................................................................................... 30
7.3 Microwave plan .................................................................................................................... 31
7.4 2Mbit/s plan.......................................................................................................................... 31
7.4.1 TBS transmission capacity ........................................................................................... 31
7.4.2 Dispatcher System transmission capacity.................................................................... 31
7.4.3 DN2 IU2 port dimensioning .......................................................................................... 32
7.4.4 DN2 port allocation....................................................................................................... 33
7.4.5 Access network dimensioning example........................................................................ 34
7.5 Timeslots allocation and cross connections ......................................................................... 35
7.5.1 Time slots allocation on DXT-TBS link ......................................................................... 35
7.5.2 Dispatcher system time slot allocation ......................................................................... 36
7.5.3 TS allocation on E1 frame ............................................................................................ 39
7.6 Access network availability................................................................................................... 40
7.6.1 Comparison between Loop and Chain topology availability......................................... 42
8. Transmission backbone network planning ................................................................................... 44
8.1 Dimensioning criteria............................................................................................................ 44
8.2 Number of nodes.................................................................................................................. 44
8.3 Network Topologies and media............................................................................................ 44
8.3.1 Loop topology............................................................................................................... 45
8.3.2 Full mesh topology ....................................................................................................... 45
8.3.3 Partial mesh topology................................................................................................... 46
8.3.4 Transit layer.................................................................................................................. 47
8.4 MW plan ............................................................................................................................... 48
8.5 Inter-DXT connections.......................................................................................................... 48
8.5.1 Voice traffic................................................................................................................... 50
8.5.2 Signalling channels ...................................................................................................... 52
8.5.3 O&M channels.............................................................................................................. 57
8.6 Routing strategy ................................................................................................................... 58
9. Tetra synchronization principles................................................................................................... 58
10. Tetra Network management system ........................................................................................ 58
11. version history .......................................................................................................................... 68
12. references ............................................................................................................................... 68
13. Abbreviations ........................................................................................................................... 68