【資料成文時(shí)間】：2007-3-23
【語言】：英文
【頁數(shù)】：137
【何人（公司）所著】：NOKIA
【文件格式】：pdf
【文件原名】：Engineering for Multimedia Gateway (MGW)
【摘要或目錄】：
NOKIA面向工程師的介紹MGW設(shè)備的文檔，包括3G R4網(wǎng)絡(luò)拓?fù)�、MGW體系結(jié)構(gòu)、主要單元介紹等
Contents
Contents 3
List of tables 5
List of figures 6
Summary of changes 9
1 About Engineering for MGW 11
2 Summary of hardware changes in the MGW for release U3A and U3B 13
3 Introduction to 3G and GSM networks 15
3.1 Network overview 15
3.2 Main functions of the MGW 17
3.2.1 Interfaces of MGW 17
3.2.2 Functionality of MGW 21
4 IPA2800 system architecture 23
4.1 Internal messaging and resource allocation 25
4.2 Computing system 25
4.3 Redundancy principles for IPA2800 network elements 27
5 Mechanical construction of the IPA2800 network elements 31
5.1 Cabinets 31
5.1.1 Dimensions of cabinets 35
5.2 Subracks 38
5.3 Plug-in units 39
5.4 Cabling 40
5.4.1 General cabling principles 41
5.5 Cooling equipment 42
6 Overview of MGW configurations 43
7 Cabinet and subrack descriptions 47
7.1 MGW cabinet types 47
7.2 Equipment in the subracks 48
7.3 CEXT cabling cabinet 61
7.4 GSM E1 and GSM T1/JT1 configurations of the MGW 62
8 Evolution paths of MGW 69
8.1 Evolution paths from U2 MGW for MSS 70
8.2 Evolution paths between MGW for MSC and MGW for MSS 71
8.3 Mixed configurations 72
9 Functional units of the MGW 75
9.1 Functional unit categories 75
9.2 Management, control computer and data processing units 76
9.2.1 CACU, Control and Administrative Computer Unit 77
9.2.2 CM, Central Memory 78
9.2.3 ISU, Interface Control and Signalling Unit 80
9.2.4 NEMU, Network Element Management Unit and its subunits 81
9.2.5 ESA24 and ESA12, Ethernet Switches 85
9.2.6 OMU, Operation and Maintenance Unit and its subunits 88
9.2.7 SPMU, Signal Processing Management Unit 93
9.2.8 VANU, Voice Announcement Unit 94
9.2.9 TCU, Transcoding Unit 96
9.3 Switching and multiplexing units 97
9.3.1 A2SU, AAL 2 Switching Unit 100
9.3.2 MXU, Multiplexer Unit 101
9.3.3 SFU, Switching Fabric Unit 103
9.4 Network element interface units 105
9.4.1 NIP1, Network Interface Unit PDH 106
9.4.2 NIS1 / NIS1P, Network Interface Unit STM-1 108
9.4.3 NIWU, Network Interface Unit TDM 109
9.4.4 IP NIU, IP Network Interface Unit Fast / Gigabit Ethernet 111
9.4.5 IWS1E/T, Network Interface Unit STM-1/OC-3 114
9.5 Timing, power distribution and Hardware Management Subsystems 115
9.5.1 TBU, Timing and Hardware Management Bus Unit 116
9.5.2 HMS subsystem 122
9.5.3 Power Distribution Subsystem 125
9.6 EHU, External Hardware Alarm Unit 130
10 Interfaces to the environment 131
10.1 Power supply and grounding interfaces 132
10.2 PDH TDM interfaces 134
10.3 SDH TDM interfaces 135
10.4 External synchronisation interfaces 135
10.5 External HW alarm interfaces 135
10.6 Ethernet/LAN interfaces 135
10.7 Mouse, keyboard, VDU, SCSI and printer interfaces 136
10.8 RS232 service terminal interfaces 136