爱....自己都没好好看过的....

【资料成文时间】：06.4
【语言】：英文
【页数】：139
【何人（公司）所著】：nokia
【文件格式】：pdf
【文件原名】：MGW HW DOC U3.03 Nokia MGW, Rel. U3A and U3B, Site Documentation
【摘要或目录】：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 87
9.2.6 OMU, Operation and Maintenance Unit and its subunits 90
9.2.7 SPMU, Signal Processing Management Unit 95
9.2.8 VANU, Voice Announcement Unit 96
9.2.9 TCU, Transcoding Unit 98
9.3 Switching and multiplexing units 99
9.3.1 A2SU, AAL 2 Switching Unit 102
9.3.2 MXU, Multiplexer Unit 103
9.3.3 SFU, Switching Fabric Unit 105
9.4 Network element interface units 107
9.4.1 NIP1, Network Interface Unit PDH 108
9.4.2 NIS1 / NIS1P, Network Interface Unit STM-1 110
9.4.3 NIWU, Network Interface Unit TDM 111
9.4.4 IP NIU, IP Network Interface Unit Fast / Gigabit Ethernet 113
9.4.5 IWS1E/T, Network Interface Unit STM-1/OC-3 116
9.5 Timing, power distribution and Hardware Management Subsystems 117
9.5.1 TBU, Timing and Hardware Management Bus Unit 118
9.5.2 Hardware Management Subsystem 124
9.5.3 Power distribution subsystem 127
9.6 EHU, External Hardware Alarm Unit 132
10 Interfaces to the environment 133
10.1 Power supply and grounding interfaces 134
10.2 PDH TDM interfaces 136
10.3 SDH TDM interfaces 137
10.4 External synchronisation interfaces 137
10.5 External HW alarm interfaces 137
10.6 Ethernet/LAN interfaces 137
10.7 Mouse, keyboard, VDU, SCSI and printer interfaces 138
10.8 RS232 service terminal interfaces 139

[ 本帖最后由 janis 于 2007-3-7 22:25 编辑 ]