Motorola Horizon macro » History » Version 15
laforge, 02/20/2016 09:01 PM
1 | 14 | laforge | {{>toc}} |
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2 | 1 | laforge | |
3 | 14 | laforge | h1. Motorola Horizon macro BTS |
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6 | 1 | laforge | The Motorola Horizon macro BTS is a BTS model manufactured by Motorola in the late 1990ies. |
7 | |||
8 | It can support up to 6 TRX, typically in a configuration of 3 sectors. |
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9 | |||
10 | 14 | laforge | There is currently no support for it in [[OpenBSC]], but we are working on it. |
11 | 1 | laforge | |
12 | 15 | laforge | {{child_pages}} |
13 | 1 | laforge | |
14 | 14 | laforge | h2. Hardware |
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16 | |||
17 | 1 | laforge | [[Image(horizonmacro_cabinet_door_open.jpg, 50%)]] |
18 | [[Image(horizonmacro_cabinet_top.jpg, 33%)]] |
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19 | 3 | laforge | |
20 | 14 | laforge | h3. CTU |
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22 | |||
23 | 13 | laforge | The up to 6 CTU modules are the individual transceivers (TRX) of the BTS cabinet. |
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25 | 6 | laforge | They plug into the SURF RF backplane and have a front-accessible |
26 | 1 | laforge | DB9 serial port, as well as a SMA connector for the TX PA output. |
27 | |||
28 | This TX PA output is normally wired using a ~10cm semi-rigid SMA cable to the TX input port of a combiner/duplexer. |
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29 | |||
30 | The CTU is of course fully shielded. But if you remove the shielding cover, it looks like this: |
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31 | |||
32 | [[Image(horizonmacro_ctu_pcb.jpg, 50%)]] |
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33 | |||
34 | You can see |
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35 | 14 | laforge | * two diversity receivers in the top left part |
36 | * digital section in the top right part |
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37 | * transmit section (exciter) in the center |
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38 | * RF power amplifier in the bottom right part |
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39 | 1 | laforge | |
40 | 14 | laforge | |
41 | h4. digital part |
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42 | |||
43 | 1 | laforge | The CTU digital part has the following connections |
44 | 14 | laforge | * backplane connector for |
45 | ** power supply (27V DC) |
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46 | ** two redundand 2048 Mbps TDM links with MCUF, manchester-encoded, 32 timeslots |
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47 | * three coaxial backplane connectors with SURF |
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48 | ** Rx side A (diversity) |
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49 | ** Rx side B (diversity) |
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50 | ** Rx loopback (for transmitting into Rx path, loopback testing) |
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51 | 1 | laforge | The CTU digital part consists of three main processors: |
52 | 14 | laforge | * RSS (Radio Subsystem) |
53 | ** communicates with MCUF via dedicated 64kbps timeslots in TDM link |
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54 | ** communicates via dual-ported ram with CCCP |
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55 | ** Flash EEPROM for boot loader and 8 MByte DRAM |
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56 | * EQCP (Equalizer and Control Processor) |
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57 | ** DSP for radio control and channel equalization |
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58 | ** alarm management |
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59 | ** downlink burst building and modulator control |
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60 | ** tx power control |
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61 | ** synthesizer channel control |
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62 | ** rf frequency hopping |
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63 | ** receiver front-end and remote tune combiner control |
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64 | ** uplink synchronziation and equalization |
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65 | ** diversity receiver control |
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66 | ** automatic gain control |
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67 | ** receiver signal sthrength calculation |
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68 | * CCCP (Channel Coder Control Processor) |
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69 | ** DSP for channel coding, data routing and baseband hopping |
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70 | ** uplink channel decoding |
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71 | ** downlink channel encoding |
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72 | ** A5 encryption |
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73 | ** baseband frequency hopping |
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74 | ** TRAU frame collection and synchronization |
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75 | 13 | laforge | |
76 | 14 | laforge | The CTU has a three serial consoles routed to the same DB-9 plug. We describe it in [[Motorola_Horizon_macroCTU_Console]] |
77 | 1 | laforge | |
78 | |||
79 | 14 | laforge | h3. Combiner |
80 | |||
81 | |||
82 | 1 | laforge | The combiner / duplexer combines the TX signal of two CTU and duplexes it with the Rx path in order to be able to have two TRX attached to one antenna |
83 | |||
84 | |||
85 | 14 | laforge | h3. MCUF |
86 | |||
87 | |||
88 | 1 | laforge | The MCUF is a full-size digital board and contains the BTS controller |
89 | |||
90 | [[Image(horizonmacro_mcuf_pcb_top.jpg, 33%)]] |
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91 | 5 | laforge | [[Image(horizonmacro_mcuf_front.jpg, 33%)]] |
92 | |||
93 | 14 | laforge | h3. NIU |
94 | |||
95 | |||
96 | 5 | laforge | The NIU is a E1 interface card for up to two E1 lines. Multiple NIU boards can be plugged into the rack |
97 | |||
98 | [[Image(horizonmacro_niu_pcb.jpg, 50%)]] |
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99 | |||
100 | |||
101 | 14 | laforge | h3. BPSM |
102 | |||
103 | |||
104 | 1 | laforge | The BPSM is a small power supply for the NIU, MCUF and other digital boards |
105 | |||
106 | [[Image(horizonmacro_bpsm_pcb.jpg, 50%)]] |
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107 | 8 | laforge | |
108 | 1 | laforge | |
109 | 14 | laforge | h3. ALARMS |
110 | |||
111 | |||
112 | 1 | laforge | The ALARMS board is monitoring FAN and other alarms in the cabinet. |
113 | |||
114 | [[Image(horizonmacro_alarms_pcb.jpg, 50%)]] |
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115 | |||
116 | 14 | laforge | h3. A-bis interface |
117 | |||
118 | |||
119 | 1 | laforge | The A-bis interface is via classic E1 lines. The Horizon indoor cabinet supports up to 6 E1 ports. |
120 | |||
121 | Each NIU module serves 1 or 2 E1 ports. |
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122 | |||
123 | The E1 ports are physically routed to the BIB (Balanced Interface Board) module on top of the cabinet. |
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124 | |||
125 | The pinout of the 37pin D-Sub connector on top of the BIB board has been reversed as: |
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126 | ||Pin ||Transformer||Usage|| |
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127 | ||1 ||T1.1 ||NIUA0 Port 0 (Tx)|| |
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128 | ||2 ||T2.1 ||NIUA0 Port 0 (Rx)|| |
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129 | ||3 ||GND || |
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130 | ||4 ||T4.1 || |
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131 | ||5 ||T5.1 || |
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132 | ||6 ||GND || |
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133 | ||7 ||T7.1 || |
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134 | ||8 ||T8.1 || |
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135 | ||9 ||GND || |
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136 | ||10 ||T10.1 || |
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137 | ||11 ||T11.1 || |
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138 | ||12 ||GND || |
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139 | 8 | laforge | ||13 ||T13.1 || |
140 | ||14 ||T14.1 || |
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141 | 1 | laforge | ||15 ||GND || |
142 | ||16 ||T16.1 || |
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143 | ||17 ||T17.1 || |
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144 | ||18 ||GND || |
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145 | ||19 ||GND || |
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146 | ||20 ||T1.8 ||NIUA0 Port 0 (Tx)|| |
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147 | ||21 ||T2.8 ||NIUA0 Port 0 (Rx)|| |
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148 | ||22 || || |
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149 | ||23 ||T4.8 || |
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150 | ||24 ||T5.8 || |
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151 | ||25 || || |
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152 | ||27 ||T7.8 || |
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153 | ||28 ||T8.8 || |
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154 | ||29 ||T10.8 || |
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155 | ||30 ||T11.8 || |
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156 | ||31 || || |
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157 | ||32 ||T13.8 || |
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158 | ||33 ||T14.8 || |
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159 | 8 | laforge | ||34 || || |
160 | ||35 ||T16.8 || |
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161 | ||36 ||T17.8 || |
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162 | |||
163 | |||
164 | 14 | laforge | h2. Software |
165 | |||
166 | |||
167 | |||
168 | h3. MCUF |
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169 | |||
170 | 8 | laforge | There is a 20MByte Intel Series2 Flash PCMCIA card inside the MCUF. It contains software + configuration for the BTS. |
171 | 11 | laforge | |
172 | [[Image(horizonmacro_pcmcia_iflash2.jpg, 33%)]] |
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173 | |||
174 | There once has been a mtd_iflash2.c driver for Linux 2.4.x, but apparently it has never been merged mainline before the |
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175 | 14 | laforge | big [[CardServices]] API redesign happened in 2.6.x. So unfortunately it's not straight-forward to read them out :( |
176 | 11 | laforge | |
177 | 12 | laforge | The MCUF is able to run without the PCMCIA card. In this case, it will download all software + config via E1 from the BSC. |
178 | 1 | laforge | |
179 | 14 | laforge | The MCUF has a very extensive command line interface (MMI), for more information check [[Motorola_Horizon_macroMCUF_Console]] |
180 | |||
181 | h3. CTU |
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182 | |||
183 | 1 | laforge | It is assumed that the CTU only contains a boot loader to download the real software from the MCUF. |
184 | |||
185 | |||
186 | 14 | laforge | h2. Further reading |
187 | |||
188 | |||
189 | * Motorola BSS11 Base Station Operational Aspects (Describes BTS hardware) |
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190 | ** http://wenku.baidu.com/view/da379c82d4d8d15abe234e32.html |
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191 | * Motorola SYS01 GSM SYSTEM INTERFACES (Chapter 5: Mobis) |
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192 | ** http://read.pudn.com/downloads61/ebook/212957/SYS01.pdf |