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LTU/NTU SZ-DOC-W5-1.pd
f
Operating Manual
V
ersion: 1.5
Revision: 2002-09-10 18
L
R
M
G
Local CRC error information
Remote CRC error information
CRC Monitor
CRC Generator
Optional
Mandatory
Digital Link
NT2
G
M
ET
L
R
R
L
TV3'
NT1
LT
L
R
L
R
G
M
G
M
M
G
RX
TX
L
R
L
R
G
M
G
M
Figure 3-7: Digital Link with CRC Processing in the LT and NT1
3.3.2.4 Digital Link with CRC Monitoring in the NT1 (Option 4)
CRC4 multiframe alignment and checksum words are not regenerated in both directions, i.e.
data will be transmitted without changes in both directions. However, blocks with CRC4 errors
received from the NT2/TE and the ET will be detected and monitored by the G.826 performance
management functions of the NTU monitor.
When loss of signal or loss of frame alignment is detected at either side, AIS is transmitted at the
opposite side.
The detection of events and the state information are still valid as in normal PRA operation mode
(option 4).
- 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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