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Watson TDM
Operating Manual
Watson-TDM-Manual-W.doc
Version 2.0-01
3-26
Revision: 2008-02-07
3.6.4 Multipoint Cascading
If only a small number of timeslots has to be sent to every remote station, four
DSL links per E1 interface are not enough to fill all 32 timeslots. In such cases,
several multipoint plug-ins can be cascaded. For cascading it is possible to asso-
ciate some timeslots from an E1 interface not with a DSL link but to loop them
back to the E1 interface.
The E1 transmit signal is connected to the E1 input of the 1
st
plug-in. The E1 out-
put of the 1
st
plug-in will contain the timeslots associated with the DSL links of the
1
st
plug-in plus the looped timeslots which are unchanged. This E1 output is con-
nected to the E1 input of the 2
nd
plug-in. The 2
nd
plug-in will send some of the
timeslots that have been looped in the 1
st
plug-in to its four remote stations while
looping the timeslots which have been used by the 1
st
plug-in and also all other
timeslots which are used by subsequent plug-ins in the cascade.
The E1 output of the last plug-in is the common E1 receiving signal.
Example: we want to provision eight 256 kbps (4 timeslots) services. Four mo-
dems (STU-R #1 – STU-R #4) are connected to plug-in #1 which distributes time-
slots 0 – 15 among them. The next four modems are connected to plug-in #2 and
use timeslots 16 – 31 of the E1:
Plug-in #1
DSL A
DSL B
DSL C
DSL D
E1 #1
STU-R
#1
T
S
0
-
3
T
S
4
-
7
TS 8 - 11
T
S
1
2
-
1
5
TS
16 – 31
looped
(E1 #2
unused)
E1 Tx
Plug-in #2
DSL A
DSL B
DSL C
DSL D
E1 #1
T
S
1
6
-
1
9
T
S
2
0
-
2
3
TS 24 - 27
T
S
2
8
-
3
1
TS
0 - 15
looped
(E1 #2
unused)
E1 Rx
E1 Transmission equipment
STU-R
#2
STU-R
#3
STU-R
#4
STU-R
#5
STU-R
#6
STU-R
#7
STU-R
#8
Figure 3-19: Multipoint cascading example
- Declaration of Conformity 3
- Revision: 2008-02-07 iii 5
- Revision: 2008-02-07 v 7
- Revision: 2008-02-07 vii 9
- Limited Product Warranty 11
- Table of Contents 13
- Revision: 2008-02-07 xiii 15
- Revision: 2008-02-07 xv 17
- 1 References 19
- 2 Watson TDM Overview 20
- 2.3 Accessories 21
- 3 Watson TDM Features 23
- 3.1.3 Multipair operation 24
- Revision: 2008-02-07 3-3 25
- 3.1.5 Power Backoff 26
- 3.2 E1 Interface 27
- 3.2.2 AIS Detection 28
- 3.2.3 AIS Generation 28
- 3.2.4 E1 Clock Modes 29
- 3.2.5 High Capacity E1 30
- LTUMODE 15 31
- Note: DSL Port C is unused 31
- LTUMODE 16 31
- Note: DSL Port D is unused 31
- 3.3 ISDN PRA Interface 32
- Revision: 2008-02-07 3-11 33
- Revision: 2008-02-07 3-13 35
- 3.4 nx64 kbit/s Interface 37
- 3.4.2 Handshake Operation 38
- 3.4.5 Clock Direction 39
- 3.4.6 Clock Polarity 39
- 3.4.7 Byte Timing 39
- 3.5 Timeslot Mapping 40
- 3.5.2 nx64 mappings 41
- DSLSTU-C STU-R 42
- 3.6.1 Introduction 43
- 3.6.2 Configuration 44
- 3.6.4 Multipoint Cascading 48
- 3.7 Performance Monitoring 50
- Revision: 2008-02-07 3-29 51
- 3.8 Test loops 52
- Normal Operation 53
- After Automatic Protection 53
- Switching 53
- 3.10 Password Protection 54
- 4 Watson TDM Regenerator 55
- 4.3 Cascading 56
- 4.4 Powering 56
- Revision: 2008-02-07 4-3 57
- 5 Powering 59
- 5.3 Remote Powering 60
- 5.3.4 Power Failure Alarm 61
- Loopfeedfeed 62
- 6 LEDs, Alarms 63
- 6.2 Tabletop LEDs 64
- 6.3 Alarm Conditions 65
- 6.4 Alarm Relays 66
- 6.5 Initialization Errors 66
- 7 The Monitor 67
- 7.2 Addressing 68
- 7.2.3 Tabletop 69
- 7.3 The Monitor 70
- 7.3.4 Shortcuts 71
- 7.3.5 Continuous Displays 71
- 8.1 Introduction 73
- 8.2.1 General Commands 74
- Revision: 2008-02-07 8-5 77
- 8.2.3 DSL Configuration 79
- 8.2.5 E1 Configuration 82
- 8.2.6 PRA Configuration 82
- Revision: 2008-02-07 8-11 83
- Current Status 90
- Switched Line 90
- Command 91
- ≥ 30% on channel x (A 92
- 8.3.4 Loops 95
- 8.3.5 Reset Commands 96
- 8.4.1 G.826 Statistics 97
- 8.5.1 Connection control 101
- 8.5.2 Inventory 101
- 8.5.3 Password Commands 102
- 9 Connectors 104
- Watson-TDM-Manual-W.doc 105
- Version 2.0-01 105
- Watson TDM 105
- Operating Manual 105
- Revision: 2008-02-07 9-33 105
- 9.1.2 Tabletop Modems 106
- 9.2 DSL Connector 107
- 9.3 E1 Connectors 108
- 9.3.3 75 Ohm Connectors 109
- 9.4 nx64 kbit/s Connector 110
- Revision: 2008-02-07 9-39 111
- 9.5 Monitor Connector 112
- 9.6.2 Ground connector 113
- 9.7 Regenerator Connector 114
- 10 Cables and Mechanics 115
- 10.1.2 Tabletop 116
- 10.2 Cable Reference 117
- 10.2.3 V.35 DTE Cable 119
- 10.2.4 V.35 DCE Cable 120
- 10.2.5 X.21 DTE Cable 121
- 10.2.6 X.21 DCE Cable 121
- 11.1 Interfaces 123
- 11.1.2 User Interfaces 124
- 11.1.3 Monitor Interface 124
- 11.2 Internal clock 125
- 11.4 Power Consumption 125
- 11.5 MTBF Values 126
- 11.6 Environment 127
- 12 Product Order Codes 128
- 12.3 Regenerator 129
- 12.4 Accessories 129
- 12.5 Cables 130
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