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SZ-DOC-W5-1.pdf LTU/NTU
Version: 1.5 Operating Manual
21 Revision: 2002-09-10
3.4.5 Handshake Operation
When no loopback is established, the control circuits perform this handshake protocol:
• 105 (RTS Request to send; X.21: C): Input from DTE. For X.21, C = OFF will cause a DTR
alarm.
• 106 (CTS Ready for sending, X.21: I):
- if Handshake option enabled: is set ON when a DSL connection is established and 105
= ON is detected.
- if Handshake option disabled: is set ON when a DSL connection is established
• 107 (DSR Data set ready): is set ON when a DSL connection is established
• 108 (DTR Data terminal ready): input from DTE. For V.35 and V.36, 108 = OFF will cause a
DTR alarm.
• 109 (RLSD Data channel received line signal detector): is set ON when a DSL connection is
established.
• 140 (RL Loopback / Maintenance test): Input from DTE; will be set OFF in normal mode.
• 141 (LL Local loopback): input from DTE; will be set OFF in normal mode.
• 142 (TM Test indicator): is set OFF in normal mode.
3.4.6 Supported V.54 Loops
ITU-T recommendation V.54 defines four test loops. Loops 2 and 3 correspond to DSL loopbacks
2 and 1. The interchange circuits are set in the following way:
• V.54 Loop 3
Local loop established in the DCE, i.e. DSL loopback 1 in an nx64 kbit/s NTU/LTU. These
output interchange circuits are set: 107 = ON and 142 = ON
• V.54 Loop 2
Loop in remote DCE, i.e. DSL loopback 2 in the remote (slave) NTU/LTU.
These output interchange circuits are set:
- Master: 107 = ON and 142 = ON
- Slave: 104 (received data) = 1, 106 = OFF, 107 = OFF, 109 = OFF and 142 = ON.
3.4.7 Automatic Loop Control through the DTE/DCE Interface
Automatic control through the interface is achieved by using circuits 140 and 141:
• 140 = ON and 141 = OFF ⇒ V.54 loop 2 (DSL loopback 2)
• 140 = OFF and 141 = ON ⇒ V.54 loop 3 (DSL loopback 1)
This automatic loop control can be switched on/off using the “V54LOOPS” configuration option.
The interface on the user side can be a DTE or a DCE. To connect them to the interface port, the
V.35 DTE or V.35 DCE cable must be used.
- 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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