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LTU/NTU SZ-DOC-W5-1.pd
f
Operating Manual
V
ersion: 1.5
Revision: 2002-09-10 84
E1 interface 1 TS0
→
unused,
E1 interface 1 TS1 … 10, 31
→
DSL interface A TS1 … 3, 5 …12,
E1 interface 1 TS11 … 20
→
DSL interface B TS1 … 10,
E1 interface 1 TS21 … 26
→
DSL interface C TS8 … 13,
E1 interface 1 TS27 … 30
→
DSL interface D TS1, 3, 5, 7,
E1 interface 2 TS0 … 31
→
unused.
First the E1 time slot mapping has to be configured. The loop characters in the “Multipoint
Configuration” display will be shown in lower case (‘a’ … ‘d’), which means that a time slot has
been assigned to a loop, but its position on that loop has not yet been defined.
Thereafter, the time slots which are used on the DSL loops have to be selected. Time slots which
are selected on the loop will be displayed in upper case (‘A’ … ‘D’) in the E1 time slot mapping.
If you select more time slots than are actually mapped to the loop by the E1 mapping,
superfluous time slots will not be enabled. Also time slots which are outside of the range used by
the line rate configured will not be enabled.
The following restrictions apply for the multipoint configuration:
• You cannot map from both E1 interfaces to the same DSL loop.
• You must map from the same E1 interface to DSL loops C and D. Loops A and B can use
time slots from different E1 interfaces.
• When one E1 interface uses only loop A, the other E1 interface cannot use only loop B. It
should use either loop C or loop D in that case.
• Loops C and D together can use 47 time slots. This will not restrict the number of time slots
to be mapped to these loops since they have to use the same E1 interface, and thus only
can have 32 time slots. However, some fancy mappings are not possible, because the two
loops share their 47 bytes using two overlapping windows of 32 bytes and the overlapping
area can only be used by one of the two loops (the memory allocation of the two windows is
done in chunks of 8 bytes). This restriction has only an effect if you use for both loops C and
D time slots at the begin (e.g. TS1) and at the end (e.g. TS31) of the frame.
• The number of time slots looped back has to be a power of 2, i.e. 2, 4, 8 or 16 (see section
“Cascading Multipoint LTUs”.
8.2.5 Cascading Multipoint LTUs
If only a small number of time slots has to be sent to every remote station, four DSL loops per E1
interface are not enough to use all 32 time slots. In such cases, multiple LTUs can be cascaded.
The principle used for it is as follows:
The time slots that are assigned to the four DSL loops of the LTU are mapped as in the normal
case.
The time slots that are assigned to DSL loops of other LTUs are looped back.
- 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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