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Configuring Line Services
1-6
Data Flow and Medium Access Control
Devices on a Token Ring network get access to the media through token passing.
Token and data pass to each station on the ring, as follows:
1. The devices pass the token around the ring until one of them needs to transmit
data.
2. The device that wants to transmit takes the token and replaces it with a frame.
3. Each device passes the frame to the next device, until the frame reaches its
destination.
4. As the frame passes to the intended recipient, the recipient sets certain bits in
the frame to indicate that it received the frame.
5. The original sender of the frame strips the frame data off the ring and issues a
new token.
FDDI Overview
Fiber Distributed Data Interface (FDDI) comprises a set of ANSI/ISO standards
that define a 100-Mb/s, timed-token-passing LAN. FDDI is suitable for
workgroup, backbone, and back-end network configurations that require high
bandwidth and performance.
FDDI uses a dual counter-rotating ring topology for fault recovery and
sophisticated encoding techniques to ensure data integrity. Up to 500 nodes can be
connected per FDDI LAN. The FDDI standard specifies that the total length of the
fiber-optic cabling used to connect the nodes may not exceed 200 km, or 100 km
per ring.
The FDDI standards consist of the following entities:
• Physical Layer Medium Dependent (PMD)
• Physical Layer Protocol (PHY)
• Media Access Control (MAC)
• Station Management (SMT)
The PMD standard defines the physical characteristics of the media interface
connectors and the cabling, and the services necessary for transmitting signals
between nodes.
- Configuring Line Services 1
- Bay Networks Software License 3
- (continued) 4
- Contents 5
- About This Guide 17
- CompuServe 19
- How to Get Help 20
- Conventions 21
- Acronyms 22
- Chapter 1 25
- Overview of Line Protocols 25
- Concentrator 26
- Data Flow 27
- Medium Access Control 27
- Carrier Sense Multiple Access 27
- Collision Detection 27
- Ethernet Frame Formats 27
- Ethernet Media 28
- Token Ring Overview 29
- FDDI Overview 30
- FDDI Ring Operation 33
- Station Timers 34
- FDDI Ring Maintenance 34
- FDDI SMT 34
- SMT Frame Services 35
- Wide Area Circuits 37
- T1 Synchronization 38
- T1 Frame Format 39
- Figure 1-10. D4 Frame 40
- E1 Services 41
- WAN Protocols 42
- Chapter 2 43
- Accessing Line Services 43
- Editing Line Details 47
- Chapter 3 49
- Customizing Line Protocols 49
- Editing E1 Line Details 50
- 51
- 52
- 52
- Editing Ethernet Line Details 54
- 57
- 57
- 60
- Editing FDDI Line Details 63
- Editing FDDI SMT Attributes 66
- Editing FDDI MAC Attributes 72
- Editing FDDI Port Attributes 76
- Editing HSSI Line Details 78
- Editing T1 Line Details 82
- 88
- 88
- Editing ATM Line Details 89
- 95
- 99
- Chapter 4 101
- Customizing Synchronous and 101
- Asynchronous Lines 101
- 103
- 105
- 106
- 107
- 108
- 1 Address of the DCE 111
- 3 Address of the DTE 111
- 113
- 113
- 114
- 114
- 116
- Point-to-Point Addresses 118
- KG84A Support 119
- 2. Click on LAPB 123
- 125
- 125
- 127
- 131
- Chapter 5 135
- Configuring MCE1 135
- Setting Clock Parameters 136
- Configuring MCE1 137
- 4. Click on OK 137
- Configuring the MCE1 Port 141
- 142
- 144
- Configuring Non-PRI Circuits 144
- Click on Add 145
- 2. Click on Circuit 150
- 10. Select File➔Exit 153
- Configuring the Logical Line 154
- 156
- 158
- 159
- Assigning Timeslots 160
- Saving Your Changes 162
- • Assign timeslots 163
- • Save your changes 163
- Testing MCE1 Lines 165
- Setting the Test Parameters 166
- 168
- Running the Tests 170
- Chapter 6 171
- Configuring MCT1 171
- Adding MCT1 Circuits 172
- 2. Click on OK 176
- 177
- Setting MCT1 Port Parameters 178
- To edit MCT1 port parameters: 179
- Click on OK 179
- 180
- Configuring MCT1 181
- 182
- 184
- Select File➔Exit 193
- MCT1-31-1 193
- Click on a timeslot 201
- Testing MCT1 Lines 206
- Click on Line Tests 207
- 210
- 5. Click on Done 212
- Setting Test Parameters 214
- Chapter 7 219
- Configuring Multiline Services 219
- Types of Multiline Circuits 220
- Grouping Data Paths 221
- Multiline Traffic Distribution 222
- Frame Relay Considerations 223
- PPP Multilink 223
- Configuring Multiline 224
- 229
- Chapter 8 231
- Managing Line Resources 231
- Line Resource Manager (LRM) 232
- Supported Media 233
- How LRM Works with ST2 233
- 237
- 238
- 240
- Accessing LRM on an MCT1 Line 242
- Deleting LRM Services 244
- Appendix A 247
- FDDI Line Parameters 248
- HSSI Line Parameters 249
- T1 Line Parameters 250
- Token Ring Line Parameters 250
- ATM FRE2 Line Parameters 250
- ATM ARE Line Parameters 251
- Synchronous Line Parameters 252
- LAPB Parameters 253
- Asynchronous Line Parameters 254
- MCE1 Line Parameters 255
- MCT1 Line Parameters 256
- Multiline Parameters 259
- Line Resource Parameters 259
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