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SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
79 Revision: 2002-09-10
8 Point-to-Multipoint Operation
This chapter describes the point to multipoint operation.
8.1 Features
• In point-to-multipoint operation the time slots of the E1 frame may be sent to different NTUs.
In the Watson 5 point-to-multipoint implementation the time slots of the two E1 interfaces
may be assigned to four DSL loops.
• It is configurable which time slots on the DSL loops are used to carry the data from the E1
interface.
• To distribute the time slots from one E1 interface to more than four DSL loops, multipoint
LTUs can be cascaded.
Figure 8-1 shows some examples of multipoint configurations, which are obtained by
configuring explicitly point-to-point links. (Switching-off multipoint mode yields configuration a)
= pure dual LTU operation.) In addition, LTUs can be cascaded e) to increase the number of
links.
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
D
A
B
C
E1
1
E1
2
b)
c) d)
e)
D
A
B
C
E1
1
E1
2
a)
Figure 8-1: Examples of Multipoint Configuration
- WATSON 5 1
- Version Control 2
- LTU/NTU SZ-DOC-W5-1.pdf 3
- Operating Manual 3
- Revision: 2002-09-10 iv 3
- Contents 5
- Revision: 2002-09-10 viii 7
- 1 The Watson 5 Family 10
- 1.1 Important Safeguards 11
- 3 Revision: 2002-09-10 12
- 1.2 Ordering Information 13
- 1.2.3 Accessories 14
- 2 Installation Guide 16
- 2.3 Installing a Watson Modem 17
- 3.1.1 Master / Slave 18
- 3.1.2 Line Rate 19
- 3.1.3 Power Back-off 20
- 3.2.1 Framing 20
- 3.2.2 AIS Generation 21
- 3.2.3 AIS Detection 21
- 3.2.4 E1 Clock Modes 21
- Figure 3-1: Clock Sources 22
- 3.3 ISDN PRA Interface 23
- 3.3.1 PRA Mode 24
- 3.3.2 CRC4 Processing Options 24
- Digital Link 25
- TV3' 25
- 17 Revision: 2002-09-10 26
- 3.4 nx64 kbit/s Interface 29
- 3.4.5 Handshake Operation 30
- 3.4.6 Supported V.54 Loops 30
- 3.4.8 Clock Polarity 31
- 3.4.9 Byte Timing 31
- 3.5 Time Slot Mapping 32
- 25 Revision: 2002-09-10 34
- 3.6.1 TIA/EIA-485 4-wire Bus 35
- 3.6.2 TIA/EIA-485 2-wire Bus 36
- 4 Performance Monitoring 40
- 4.2.2 E1 Interface 41
- 4.2.3 ISDN PRA Interface 42
- 5.1 LEDs 44
- 5.1.2 Alarm Conditions 45
- 5.2 Alarm Relays 46
- 5.2.2 NTU 47
- 6 Power Concept 48
- 6.3 Remote Powering 49
- 41 Revision: 2002-09-10 50
- 7 Monitor 51
- 43 Revision: 2002-09-10 52
- 7.2.2 LTU Minirack 53
- 7.2.3 NTU 53
- 7.3.2.1 G826 Command 55
- 7.3.2.2 RESETG826 Command 57
- 7.3.2.3 STARTBER Command 57
- 7.3.2.4 STOPBER Command 58
- 7.3.2.5 READBER Command 58
- 7.3.2.6 RESETBER Command 59
- 7.3.3.1 DIAGNOSTIC Command 59
- 7.3.3.2 STATUS Command 60
- 7.3.3.3 ALARM Command 62
- 7.3.3.4 ALARM H Command 63
- 7.3.3.5 CLEAR Command 64
- 7.3.3.6 ACO Command 64
- 7.3.3.7 LOOP1 Command 65
- 7.3.3.8 LOOP2 Command 65
- 7.3.3.9 LOOPREGn Command 65
- 7.3.3.10 STARTAL Command 66
- 7.3.3.11 STOPAL Command 66
- 7.3.3.12 TRACETIME Command 66
- 7.3.3.13 RESET Command 66
- 7.3.3.14 RESETCARD Command 67
- 7.3.4.1 CONFIG Command 68
- 61 Revision: 2002-09-10 70
- 7.3.4.3 MP Command 71
- 63 Revision: 2002-09-10 72
- 7.3.4.4 TS Command 73
- 7.3.4.5 MODE Command 74
- 7.3.4.6 DEFAULT Command 75
- 7.3.6.2 RHM Command 77
- 7.3.6.3 RCHM Command 77
- 7.4.1.1 ALARM Command 78
- User interface in X.21 mode 79
- 7.4.2.1 CONFIG Command 80
- 7.4.2.9 UIF Command 82
- 7.4.2.10 DEFAULT Command 82
- 7.5.1 ADDRESS Command 85
- 7.5.2 V.11 WIRES Command 86
- 8.1 Features 88
- 8.2 Configuration 89
- 8.2.3 DSL Time Slot Selection 90
- Multipoint Configuration 91
- 8.2.4 MP Command 92
- 8.3 LEDs 96
- 9.1 Tabletop NTU, Rear Panel 98
- 9.2 Plug-in LTU, Front Panel 99
- 10 Connectors’ Description 100
- 10.2 E1 Connector 101
- 10.2.2 Impedance 75Ω 102
- 10.3 nx64 kbit/s Connector 103
- SZ-DOC-W5-1.pdf LTU/NTU 104
- Version: 1.5 Operating Manual 104
- 95 Revision: 2002-09-10 104
- 10.3.2 nx64 kbit/s Cables 105
- 10.3.2.2 V.35 DCE Cable 106
- 10.3.2.4 V.36 DCE Cable 108
- 10.3.2.6 X.21 DCE Cable 110
- 10.4 Monitor Connector (NTU) 111
- 10.5 48V 112
- Power Connector (NTU) 112
- 11 Technical Specifications 114
- 11.1.3 Monitor Interface 115
- 11.2 Power Supply 116
- 11.3 Environment 116
- 11.4 Physical Dimensions 117
- 12 Firmware Download 118
- Download via ACU 119
- Download via CMU 120
- Download via Modem Chain 121
- 113 Revision: 2002-09-10 122
- 13.1 Test Loops 123
- 13.2.1 Problems 124
- 13.2.2 Initialization Errors 125
- 14 Appendix 126
- 14.2 Referenced Documents 128
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