DUG 20 » History » Version 15
keith, 03/26/2021 08:50 PM
1 | 1 | laforge | h1. DUG 20 |
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2 | |||
3 | 2 | laforge | This is the second-generation GSM Digital Unit for RBS 6xxx. It combines the baseband processing and back-haul interface of up to 12 TRX, in 1..6 logical BTSs. |
4 | 1 | laforge | |
5 | 2 | laforge | The DUG 20 is only compatible with the [[RUS]] and [[RRUS]] radio units, not with the older [[RUG]] units. |
6 | |||
7 | 3 | roh | {{thumbnail(DUG20_01_front_complete.jpg, size=900)}} |
8 | |||
9 | 4 | roh | {{>toc}} |
10 | |||
11 | 2 | laforge | h2. Technical data |
12 | |||
13 | 13 | keith | * -48V DC supply power |
14 | 2 | laforge | * 70W maximal power consumption |
15 | * Size: 8U x 31mm x 250mm |
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16 | * Weight: < 2kg |
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17 | |||
18 | 7 | laforge | h2. Flash |
19 | 2 | laforge | |
20 | 7 | laforge | There is a CF slot on the left this device and it holds a 256mbyte CF card. The card contains a FAT filesystem with both the software as well as the configuration (IDB = Installatin DataBase). |
21 | 1 | laforge | |
22 | 7 | laforge | {{thumbnail(DUG20_01_CF-slot_detail.jpg, size=400)}} |
23 | 1 | laforge | |
24 | 7 | laforge | h2. Connections |
25 | 2 | laforge | |
26 | 7 | laforge | h3. Front Haul |
27 | 2 | laforge | |
28 | 7 | laforge | The DUG 20 has 6 SFP slots for the interface towards the radio units, labelled RI A..F |
29 | 3 | roh | |
30 | 7 | laforge | {{thumbnail(DUG20_01_SFP_1_detail.jpg, size=400)}} |
31 | {{thumbnail(DUG20_01_SFP_2_detail.jpg, size=400)}} |
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32 | 3 | roh | |
33 | 7 | laforge | This is where you connect your [[RUS]] or [[RRUS]], either via direct-attach cables (usual for RUS), or via SFP transceivers and optical fiber (usual for RRUS). |
34 | 3 | roh | |
35 | 7 | laforge | h3. Back-Haul interface |
36 | 3 | roh | |
37 | 7 | laforge | The back-haul interface is Classic T1/E1/J1 (ISDN) based. The DUG has four T1/E1/J1 lines exposed as two RJ45 connectors ("ET A" and "ET B") |
38 | 3 | roh | |
39 | 7 | laforge | {{thumbnail(DUG20_01_ETB_ETA_detail.jpg, size=400)}} |
40 | 1 | laforge | |
41 | 11 | tnt | Pinout: |
42 | |||
43 | |_.RJ45|_.Line|_.Signal| |
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44 | |1|A|RX tip (+)| |
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45 | |2|A|RX ring (-)| |
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46 | |3|B|TX tip (+)| |
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47 | |4|A|TX tip (+)| |
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48 | |5|A|TX ring (-)| |
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49 | |6|B|TX ring (-)| |
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50 | |7|B|RX tip (+)| |
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51 | |8|B|RX ring (-)| |
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52 | |||
53 | Same pinout as a Digium card with 2 lines per port. |
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54 | So a cross-over cable is needed to connect to it. |
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55 | |||
56 | 1 | laforge | |
57 | h3. ESB port |
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58 | |||
59 | note that its a bit smaller than the sfp slots |
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60 | |||
61 | {{thumbnail(DUG20_01_ESB_detail.jpg, size=400)}} |
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62 | |||
63 | h3. LMT B, LMT A, EC, GPS |
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64 | |||
65 | {{thumbnail(DUG20_01_LMT_GPS_detail.jpg, size=400)}} |
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66 | |||
67 | 7 | laforge | h3. LMT A |
68 | |||
69 | LMT (Local Maintenance Terminal) A hosts a RS-232 port used for connecting to the DUG 20 from a PC running the OMT software. |
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70 | |||
71 | 8 | laforge | |_.RJ45|_.DB-9 (female)|_.Signal| |
72 | |1|5|GND| |
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73 | |2|3|TxD| |
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74 | |3|2|RxD| |
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75 | |||
76 | 1 | laforge | h3. LMT B |
77 | 9 | laforge | |
78 | Site-LAN and LMT B |
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79 | 7 | laforge | |
80 | FIXME |
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81 | |||
82 | h3. EC |
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83 | |||
84 | 10 | laforge | "Enclosure Control". A (likely) RS-485 based site-local bus between different parts, particularly any power supply / climate systems and the digital unit. Used for monitoring/alamrs in case of environmental failure. |
85 | 7 | laforge | |
86 | h3. GPS |
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87 | |||
88 | This port is meant for attaching an external GPS receiver. The connector includes |
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89 | * RS485/422 receiver for NMEA from the GPS |
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90 | * RS485/422 transmitter for command to the GPS |
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91 | * RS485/422 receiver for 1PPS signal from the GPS |
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92 | * 12V power supply for the GPS |
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93 | |||
94 | 13 | keith | h3. -48V DC in |
95 | 1 | laforge | |
96 | Connectory type is a https://www.te.com/usa-en/product-1982299-3.html with associated crimp contacts. |
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97 | |||
98 | {{thumbnail(DUG20_01_DC_in_detail.jpg, size=400)}} |
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99 | |||
100 | 13 | keith | Telecom equipment such as the DUG 20 typically has a positive ground system also known as "negative" 48 Volt[1]. |
101 | 1 | laforge | |
102 | 15 | keith | Be aware (beware!) of short circuits. The chassis of the DUG and any other ground terminal on any port is connected to the +48v terminal, If any other equipment with a (typical) negative ground system is connected to the same DC supply as the DUG, there will be voltage difference between the ground terminals (and chassis) of this equipment and the DUG. |
103 | 13 | keith | |
104 | 3 | roh | h3. Connector on the Back |
105 | |||
106 | 7 | laforge | This connector is not used during normal operation. We assume it is for factory / service use only. |
107 | |||
108 | 3 | roh | {{thumbnail(DUG20_01_backplane_detail.jpg, size=400)}} |
109 | 7 | laforge | |
110 | |||
111 | h2. LEDs |
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112 | |||
113 | {{thumbnail(DUG20_01_LED_detail.jpg, size=400)}} |
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114 | |||
115 | |||
116 | 3 | roh | |
117 | h2. Overview Pictures |
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118 | |||
119 | {{thumbnail(DUG20_01_front_perspective.jpg, size=400)}} |
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120 | {{thumbnail(DUG20_01_left_perspective.jpg, size=400)}} |
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121 | {{thumbnail(DUG20_01_right_perspective.jpg, size=400)}} |
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122 | {{thumbnail(DUG20_01_back_perspective.jpg, size=400)}} |
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123 | {{thumbnail(DUG20_01_bottom_complete.jpg, size=400)}} |
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124 | 12 | laforge | |
125 | h3. Internal pictures |
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126 | |||
127 | {{thumbnail(dug20_pcba_top.jpg, size=400)}} |
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128 | {{thumbnail(dug20_pcba_bot.jpg, size=400)}} |
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129 | {{thumbnail(dug20_pcba_rj45.jpg, size=400)}} |
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130 | {{thumbnail(dug20_pcba_rs232.jpg, size=400)}} |
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131 | |||
132 | |||
133 | h2. Spare Parts |
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134 | |||
135 | 1 | laforge | * 4-port RJ45 assenmbly including LMT ports: Amphenol RJHSE538004 |
136 | * RS232 transceiver of LMT A port: ST3232ECTR |
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137 | 13 | keith | |
138 | fn1. https://www.poweringthenetwork.com/uncategorized/negative-48-volt-power-what-why-and-how/ |