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About Line Protocols
114078 Rev. A 2-9
The TTRT is the value that the MAC sublayer uses to time its operations. The
claim token process determines which node initializes the ring (generates the
token). The node with the lowest bid for the TTRT wins the right to generate
the token.
3. After a node has initialized the ring, the ring begins to operate in steady state.
In steady state, the nodes exchange frames using the Timed-Token Protocol
(TTP). The TTP defines how the TTRT is set, the length of time a node can
hold the token, and how a node initializes the ring. The ring remains in steady
state until a new claim token process occurs (for example, when a new node
joins the ring).
4. The nodes pass the token from one node to another on the FDDI ring.
5. A node on the ring captures the token when it wants to transmit data, and then
transmits data to its downstream neighbor.
6. Each node reads and repeats frames as it receives them. If a node detects an
error in a frame, the node sets an error indicator.
7. A frame circulates on the ring until it reaches the node that first transmitted it.
That node removes the frame from the ring.
8. When the first node has sent all of its frames, or exceeded the available
transmission time, it releases the token back to the ring.
Station Timers
Each node uses three timers to regulate its operation in the ring:
• Token rotation timer (TRT)
• Token holding timer (THT)
• Valid transmission timer (TVX)
The TRT times the period between the receipt of tokens. TRT is set to varying
values, depending on the state of the ring. During steady-state operation, the TRT
expires when the actual token rotation time exceeds the TTRT.
The THT controls the length of time that a node can hold the token to transmit
frames. The value of the THT is the difference between the arrival time of the
token and the TTRT.
- Configuring Line 1
- Services 1
- Bay Networks Software License 3
- Contents 5
- 114078 Rev. A vii 7
- 114078 Rev. A ix 9
- 114078 Rev. A 10
- 114078 Rev. A xi 11
- 114078 Rev. A xiii 13
- 114078 Rev. A xv 15
- 114078 Rev. A xvii 17
- 114078 Rev. A xix 19
- About This Guide 21
- Before You Begin 22
- Conventions 22
- Acronyms 23
- 114078 Rev. A xxv 25
- Bay Networks Customer Service 26
- World Wide Web 27
- Customer Service FTP 27
- Support Source CD 28
- CompuServe 28
- InfoFACTS 29
- How to Get Help 29
- Chapter 1 31
- Getting Started 31
- 1-2 114078 Rev. A 32
- Click on Edit 33
- (Figure 1-3) 33
- Select Lines > Edit Lines 34
- The Edit Lines window appears 34
- Chapter 2 37
- About Line Protocols 37
- Ethernet Overview 38
- 2-4 114078 Rev. A 40
- ConcentratorConcentrator 41
- 2-6 114078 Rev. A 42
- 2-8 114078 Rev. A 44
- Station Timers 45
- 2-10 114078 Rev. A 46
- SMT Frame Services 47
- 2-12 114078 Rev. A 48
- Token Ring Overview 49
- 2-14 114078 Rev. A 50
- Figure 2-7. Token Ring LAN 50
- Overview of WAN Protocols 51
- HSSI Overview 52
- ISDN Overview 52
- MCE1 and MCT1 Overview 53
- Synchronous Overview 54
- T1 Overview 54
- Figure 2-8. D4 Frame 55
- 2-20 114078 Rev. A 56
- Figure 2-10. Bipolar Format 57
- Chapter 3 58
- Customizing LAN Interfaces 58
- Setting the BofL Interval 59
- 3-4 114078 Rev. A 61
- 3-6 114078 Rev. A 63
- Editing FDDI Lines 65
- 3-10 114078 Rev. A 67
- 2. Click on SMT Attributes 67
- 3-12 114078 Rev. A 69
- 3-14 114078 Rev. A 71
- Editing FDDI Path Attributes 72
- 3-16 114078 Rev. A 73
- 2. Click on Path Attributes 73
- Editing FDDI Port Attributes 74
- Editing Token Ring Lines 75
- Specifying the Ring Speed 76
- Chapter 4 78
- Customizing WAN Interfaces 78
- 4-2 114078 Rev. A 79
- Setting the Framing Mode 81
- Editing ATM FRE-2 Lines 83
- 4-8 114078 Rev. A 85
- Editing E1 Lines 87
- Assigning Channel Functions 88
- Editing HSSI Lines 89
- 4-14 114078 Rev. A 91
- Editing T1 Lines 93
- Chapter 5 96
- Customizing Synchronous and 96
- Asynchronous Interfaces 96
- Specifying the Start Protocol 97
- 114078 Rev. A 5-3 98
- Setting the Baud Rate 99
- Setting the Idle Timer 99
- 114078 Rev. A 5-5 100
- Configuring Line Services 101
- 5-6 114078 Rev. A 101
- 114078 Rev. A 5-7 102
- Setting the Station Type 103
- Setting the Control Field 103
- Setting the Window Size 104
- Setting the N2 Retry Count 104
- Setting the Link Setup Action 105
- 114078 Rev. A 5-11 106
- Editing Synchronous Lines 107
- 114078 Rev. A 5-13 108
- Setting the BofL Timeout 109
- Setting the Clock Source 110
- 5-16 114078 Rev. A 111
- Setting the Signal Mode 112
- 5-18 114078 Rev. A 113
- Setting Minimum Frame Spacing 114
- 5-20 114078 Rev. A 115
- 114078 Rev. A 5-21 116
- Setting the CRC Size 117
- Setting the Signaling Method 117
- Setting the Line Coding 118
- Setting the Retry Count 119
- Setting the Link Idle Timer 119
- Setting the Cable Type 120
- Setting the Retry Timer 120
- Setting Sync Priority 121
- Configuring KG84A Security 122
- LS0017A 123
- 114078 Rev. A 5-29 124
- 5-30 114078 Rev. A 125
- Chapter 6 126
- Setting the Clock Parameters 128
- Customizing MCE1 Port Details 129
- 114078 Rev. A 6-5 130
- 6-6 114078 Rev. A 131
- Customizing MCT1 Port Details 132
- 6-8 114078 Rev. A 133
- 114078 Rev. A 6-9 134
- 6-10 114078 Rev. A 135
- 114078 Rev. A 6-11 136
- 6-12 114078 Rev. A 137
- 114078 Rev. A 6-13 138
- Defining Logical Lines 140
- (MCE1 example) 142
- Customizing Logical Lines 143
- 114078 Rev. A 6-19 144
- 6-20 114078 Rev. A 145
- 114078 Rev. A 6-21 146
- 6-22 114078 Rev. A 147
- 114078 Rev. A 6-23 148
- 6-24 114078 Rev. A 149
- Assigning Timeslots 150
- 2. Click on B-Channels 152
- 114078 Rev. A 6-29 154
- Chapter 7 156
- Configuring Multiline Services 156
- Multiline Example 157
- Types of Multiline Circuits 158
- Grouping Data Paths 159
- Multiline Traffic Distribution 160
- Frame Relay Considerations 161
- PPP Multilink 161
- Configuring Multiline 162
- 114078 Rev. A 7-9 164
- 114078 Rev. A 7-11 166
- 114078 Rev. A 7-13 168
- 114078 Rev. A 7-15 170
- Select File > Exit 171
- (Figure 7-12) 171
- 114078 Rev. A 7-17 172
- Chapter 8 174
- Managing Line Resources 174
- Line Resource Manager (LRM) 175
- Starting the LRM 176
- Configuring the LRM 179
- 8-8 114078 Rev. A 181
- 8-10 114078 Rev. A 183
- 114078 Rev. A 8-11 184
- Deleting LRM Services 185
- 5. Click on OK 186
- Appendix A 188
- 189
- 190
- 190
- 191
- A-6 114078 Rev. A 193
- A-10 114078 Rev. A 197
- 114078 Rev. A A-11 198
- 200
- 200
- 202
- A-16 114078 Rev. A 203
- 114078 Rev. A A-17 204
- A-18 114078 Rev. A 205
- 209
- 213
- 214
- 215
- A-30 114078 Rev. A 217
- 218
- 219
- 220
- A-34 114078 Rev. A 221
- 114078 Rev. A A-35 222
- 223
- 114078 Rev. A A-37 224
- 225
- 227
- 227
- 228
- 232
- 234
- 236
- A-50 114078 Rev. A 237
- 238
- 240
- A-54 114078 Rev. A 241
- A-56 114078 Rev. A 243
- 244
- 245
- 245
- 247
- A-62 114078 Rev. A 249
- 114078 Rev. A A-63 250
- 252
- A-66 114078 Rev. A 253
- 255
- 255
- 256
- A-70 114078 Rev. A 257
- 258
- 259
- 114078 Rev. A A-73 260
- 261
- 114078 Rev. A A-75 262
- 263
- 263
- 114078 Rev. A A-77 264
- 266
- A-80 114078 Rev. A 267
- Appendix B 268
- Asynchronous Line Parameters 269
- ATM FRE-2 Line Parameters 269
- ATM ARE Line Parameters 270
- E1 Line Parameters 271
- FDDI Line Parameters 272
- HSSI Line Parameters 273
- LAPB Parameters 274
- MCE1 Line Parameters 274
- (continued) 275
- (continued) 276
- T1 Line Parameters 281
- Token Ring Line Parameters 281
- Multiline Parameters 281
- Table B-30. LRM Parameters 282
- Appendix C 284
- Setting Test Parameters 285
- 114078 Rev. A C-3 286
- Setting the BERT Alarm Type 287
- Setting the BERT Test Pattern 287
- Setting the Line Type 288
- C-6 114078 Rev. A 289
- Running Port Tests 290
- C-8 114078 Rev. A 291
- 114078 Rev. A C-9 292
- 114078 Rev. A Index-1 294
- 114078 Rev. A Index-3 296
- 114078 Rev. A Index-5 298
- 114078 Rev. A Index-7 300
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