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W5-Ethernet-Manual.doc
Version 2.0-01
Watson 5 Ethernet
Operating Manual
Revision: 2006-04-27 3-7
3.1.3 Power Backoff
The transmit power of the modems can be decreased by activating the power back-off mode. This
reduces interference to other transmission systems operating on adjacent pairs bundled in the
same cable.
With enabled power back-off the transmit power will be reduced adaptively in function of the esti-
mated cable attenuation:
Estimated Power Loss(*) Power Backoff
< 1 dB 6 dB
< 2 dB 5 dB
< 3 dB 4 dB
< 4 dB 3 dB
< 5 dB 2 dB
< 6 dB 1 dB
≥ 6 dB
no backoff
(*) Calculated as Tx Power – Esti-
mated Rx Power
Table 3-2: Power Backoff
Note: Power backoff can be configured individually for plugin and tabletop.
3.1.4 Symmetric and Asymmetric PSDs
The Watson 5 Ethernet tabletop modems support asymmetric PSDs for linerates of 2'056 kbit/s and
2'312 kbit/s.
Activating asymmetrical PSD masks will increase upstream transmit power (STU-R " STU-C).
This improves near-end crosstalk (NEXT) at the STU-C side and will increase the possible loop
length in cases where many DSL links have to share the same cable e.g. coming out of a central of-
fice.
Note: The Watson 5 Ethernet plugin does not support asymmetric PSDs.
3.1.5 DSL Performance
The Watson 5 Ethernet modems provide information about the current Signal Quality and Attenua-
tion of a DSL link.
Signal Quality
The Signal Quality is the noise margin calculated by the modem:
SQ = SNR1 - SNR0
Where
SQ is the calculated noise margin
SNR1 is the signal to noise ratio calculated by the transceiver by analyzing the error correc-
tion bits (Trellis bits) in the line code.
SNR0 is the signal to noise ratio that gives a bit error rate of 10
-7
in presence of average
white Gaussian noise. For TC-PAM16 the theoretical value for SNR0 is 27.7 dB.
- Declaration of Conformity 3
- Revision: 2006-04-27 5
- Limited Product Warranty 7
- Table of Contents 9
- Watson 5 Ethernet 11
- Operating Manual 11
- Revision: 2006-04-27 xi 11
- W5-Ethernet-Manual.doc 11
- Version 2.0-01 11
- Revision: 2006-04-27 xiii 13
- 1 Related Documents 15
- 2 Overview 17
- Figure 2-2: Campus Networks 18
- 2.3 Modem Types 19
- 2.4 Accessories 19
- 2-4 Revision: 2006-04-27 20
- 3 Modem Features 21
- 3.1.2 Multipair operation 22
- 3.1.3 Power Backoff 23
- 3.1.5 DSL Performance 23
- 3.1.6 Wetting Current 24
- 3.1.7 Master / Slave 25
- 3.1.8 DSL Clocking 25
- 3.2 Ethernet (plugin modem) 26
- 3.2.3 VLANs 27
- 3.2.4 VLAN Examples 28
- Revision: 2006-04-27 3-13 29
- 3-14 Revision: 2006-04-27 30
- 3.2.6 Stacked VLANs 31
- 3-16 Revision: 2006-04-27 32
- 3.3.1 Ethernet over DSL 33
- 3.3.2 VLAN transparency 33
- 3.3.3 Mixed mode operation 34
- 3.3.4 Cisco HDLC 34
- 3.4 Firmware update 35
- 3.5 Management 35
- 3-20 Revision: 2006-04-27 36
- Revision: 2006-04-27 3-21 37
- Tabletop 38
- Revision: 2006-04-27 3-23 39
- 3.7 Test loops 40
- 3.8 Password protection 40
- Revision: 2006-04-27 3-25 41
- 4 Powering 43
- 5 LEDs and Alarms 45
- 5.2 Tabletop LEDs 46
- 5.3 Alarm Conditions 47
- 5.4 Alarm Relays 47
- 5.5 Initialization Errors 48
- 6 The Monitor 49
- 6.2 Addressing of Plugins 50
- 6.3 Naming of ports 51
- 6.4 Telnet Access 51
- 6.5.1 Welcome Screen 52
- 6.5.2 Menus 52
- 6.5.3 Prefixes an Shortcuts 52
- 6.5.4 Tab completion 53
- 6.5.5 Help 53
- 6.5.6 Command History 53
- 6.5.7 Continuous Displays 53
- 7.1.1 General Commands 55
- 7-2 Revision: 2006-04-27 56
- Revision: 2006-04-27 7-3 57
- 7-4 Revision: 2006-04-27 58
- Revision: 2006-04-27 7-5 59
- 7-6 Revision: 2006-04-27 60
- Revision: 2006-04-27 7-7 61
- 7-8 Revision: 2006-04-27 62
- 7.1.7 VLAN Configuration 63
- 7-10 Revision: 2006-04-27 64
- Revision: 2006-04-27 7-11 65
- 7-12 Revision: 2006-04-27 66
- Revision: 2006-04-27 7-13 67
- 7-14 Revision: 2006-04-27 68
- Revision: 2006-04-27 7-15 69
- 7-16 Revision: 2006-04-27 70
- 7.2.1 Diagnostic 71
- 7.2.2 Status (Plugin) 72
- 7.2.3 Status (Tabletop) 73
- 7.2.4 Alarms 74
- Revision: 2006-04-27 7-21 75
- 7.2.5 Test loops 76
- 7.2.6 Reset Commands 76
- 7.3.1 G.826 Statistics 77
- 7.3.2 Ethernet Statistics 78
- Revision: 2006-04-27 7-25 79
- 7.4.1 Connection control 80
- 7.4.2 Inventory 80
- 7.4.3 Password 81
- 7.4.4 Firmware Upgrade 82
- Revision: 2006-04-27 7-29 83
- 8 SNMP 85
- 8.1.3 The Entity MIB 86
- 8.1.2 SNMP Configuration 86
- 8.1.4 VLAN indexing 87
- 8.2 MIB Reference 88
- 8.2.5 Entity MIB (RFC 2737) 89
- 8.2.6 RMON (RFC 2819) 89
- 8.2.7 IF MIB (RFC 2863) 89
- 8.2.11 MAU MIB (RFC 3636) 90
- 8.2.13 HDSL MIB 91
- 8.2.14 Schmid MIB 91
- 8.2.15 Watson MIB 91
- 9 Front and Rear Panels 93
- 10 Connectors and Cables 95
- 10.1.2 DSL Cable 96
- 10.2 Ethernet Interface 97
- 10.3 Monitor Interface 97
- 10.4 Power and Grounding 98
- 11.1 Interfaces 99
- 11.2 Power Consumption 100
- 11.3 Ethernet 100
- 11.4 Latency and Throughput 101
- 11.5 Management Functions 101
- 11.6 MTBF 101
- 11.7 Environment 102
- 12 Terminology 103
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