Encore 24 PORTS NWAY SWITCHING HUB User's Guide Page 181
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Glossary G-7
G
DSU Loopback
A DSU loopback is intended to include as much of the customer data
communications circuitry in the looped-back path as possible. The signal passes
from the remote unit into the local unit as far as the DSU. This test loops the
received network signal back to the network.
DSU/CSU (Data Service Unit/Channel Service Units)
The pair of communications devices that connect an in-house line to an
external digital circuit. At the customer's end of the telephone connection, the
DSU/CSU takes data from terminals and computers, encodes it, and transmits
it down the link. At the receive end, another DSU/CSU equalizes the received
signal, Þlters it, and decodes it for interpretation by the end-user.
DSX-1 (Digital Signal Cross Connect Level 1)
Parameters set used when DS-1 signals are cross connected.
DTE (Data Terminal Equipment)
Terminal equipment connected to the DSU and used for communication over
digital networks. May be a terminal, computer, printer or multiplexer.
DTE loopback
An EIA-232-D signal which indicates that the DTE is ready for operation.
DTR (Data Terminal Ready)
Signal from DTE to DSU/CSU.
E
EER (Excessive Error Rate)
Determined by counting the number of T1/T3 code violations during a time
interval.
EFS (Error Free Seconds)
Occurs when a second is free of CRC-6 violations or Out of Frame (OOF) events
or one or more BPV or OOF events.
EIA (Electronic Industries Association)
An organization which sets data communication industry standards.
- Encore Multi-port 1
- DSU/CSU User Guide 1
- Disclaimer 3
- ISO RegistrationCompliance 4
- Table of Contents 5
- Chapter 2, Installation 2-1 6
- Chapter 3, ConÞguration 3-1 7
- Table of Contents ix 9
- Table of Contents xi 11
- Glossary Glossary-1 13
- Index Index-1 13
- List of Figures G 15
- List of Figures xvii 17
- List of Tables G 19
- List of Tables xxi 21
- Preface G 23
- Typographic Conventions 25
- To follow a link: 26
- To retrace your viewing path: 26
- Examples 26
- Returning a DSU/CSU 28
- Send Us Your Comments 28
- Introduction 29
- DL100 30
- Service 31
- Data ports 32
- Access/Management Features 32
- Compliancy 33
- About the Telnet Utility 33
- Installation 35
- Required Location 36
- Check the Equipment 36
- Equipment Model Numbers 37
- Installation 2-5 39
- Connecting to Power 40
- Installation 2-7 41
- Connecting to the T1 Network 46
- About the Cabling 46
- Determine Correct Distance 47
- ConÞguration 49
- Check the Comm Port Settings 50
- Connecting an ANSI Terminal 51
- ConÞguration 3-5 53
- Access Rights 54
- The Unit ID 55
- Log On from a Terminal 56
- Log On Through Telnet 56
- Log On in Other Conditions 57
- Logging Off 57
- Editing a Parameter 59
- ConÞguration 3-13 61
- (INTERNAL) is used 66
- DSU/CSU and the 66
- ConÞguring the Data Ports 67
- DSU/CSU inverts the 68
- DSU/CSU removes the 1s 68
- Allocating Timeslots 69
- Three Allocation Methods 69
- ConÞguration 3-23 71
- ConÞguring for SNMP 76
- ConÞguration 3-29 77
- How Alarms Are Reported 81
- Menu-7 Alarm I 83
- DSU/CSU is 84
- Menu-8 Alarm II 85
- DSU/CSU waits 89
- Modem Initialization 90
- ConÞguration 3-43 91
- Monitoring and 93
- Management 93
- Monitoring Status 94
- Menu-1 Main Status Parameters 95
- network signal is missing 96
- AUX DTE Status 97
- DATA DTE Status 97
- Menu-2 Data DTE Status 99
- Data DTE Status Parameters 100
- Monitoring Performance 101
- (Figure 4-4) 103
- Displaying the Event Log 107
- Event Log Parameters 108
- The Front Panel 111
- The Interface 112
- Using the Front Panel 113
- (▲) or Down (▼) arrow 113
- (▲) and Down (▼) arrows at 113
- Changing Information 114
- Monitor Submenus 115
- Test Submenus 116
- Running a TEST PATTERN 117
- ConÞguration Submenus 118
- The Front Panel 5-9 119
- The AUX CONFIG Menu 120
- Required Information 120
- Keep a Record 121
- Diagnostics and 123
- Troubleshooting 123
- Adding a Caution Flag 124
- Menu-9 Diagnostics Parameters 126
- 1:1 Pattern QRW Pattern 128
- The Self Test 129
- The Loop DTE Test 129
- The Loop NET Test 130
- The Loop Payload Test 131
- The DTE/NET Test 132
- The Loop Up Remote Test 133
- The Pattern Tests 135
- The Send All Zeroes Test 136
- The Send 1:2 Test 136
- Required Tools 137
- The DSU/CSU does not Power Up 138
- The NET LED is Constantly Red 141
- LEDs do not Illuminate 144
- Running Loopbacks 146
- Running the Pattern Test 147
- Technical SpeciÞcations 149
- DS1 Interface 150
- System Timing 150
- Front Panel 151
- Power Options 151
- Alarm Contacts 152
- Environmental 152
- Regulatory 153
- Diagnostics and Tests 154
- Front Panel LEDs 155
- LEDs (Continued) 157
- T1 line. Non-intrusive 158
- T1 network. Non-intrusive 158
- Technical SpeciÞcations A-11 159
- Factory Default ConÞguration 161
- Not Assigned 162
- Connector Pin 165
- Assignments 165
- DTE Port Pin Assignments 166
- 3 Send toward DTE Tip (T1) 166
- DTE Ring (R1) 166
- 4 Frame Ground 166
- (I/O to all DSUs only) 168
- Adapter Pin Assignments 169
- DTE Clock Rates 170
- ConÞguration Worksheet 171
- SNMP ConÞguration 173
- Glossary 175
- Glossary G-3 177
- Glossary G-5 179
- Glossary G-7 181
- See also 183
- Glossary G-11 185
- Glossary G-13 187
- Glossary G-15 189
- Glossary G-17 191
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