IBM 8260 - page 212

190 8260 Multiprotocol Intelligent Switching Hub

Contents

Main Page Page First Edition (May 1995) Abstract Page Contents vi Page viii Figures x Page xii Tables Page Special Notices xvi Preface How This Document is Organized Related Publications International Technical Support Organization Publications xviii TOOLS SENDTO WTSCPOK TOOLS REDBOOKS GET REDBOOKS CATALOG Acknowledgments Page Chapter 1. An Overview of the IBM 8260 Hub 1.1 Introduction modules 2 1.2 8260 Hardware Description 1.2.1 IBM 8260 Model 017 1.2.1.1 8260 Backplane 1.2.1.2 Payload Area per-port switching 4 8250 Adapter Kit module-switching Page 1.2.1.3 Fault-Tolerant Controller Module Slots will 6 1.2.1.4 The Intelligent Power Subsystem 1.2.2 The Intelligent Cooling Subsystem 1.2.2.1 Distributed Management Architecture 1.2.3 8260 Model 010 1.3 8260 Modules and Daughter Cards 1.3.1 Ethernet Modules 8 1.3.1.1 8260 Ethernet 24-Port 10Base-T Module 1.3.1.2 8260 Ethernet 20-Port 10Base-T Module 1.3.2 Token-Ring Modules 1.3.2.1 8260 TR 18 Port Active PPS Switch Module 1.3.2.2 8260 TR 18 Port Active Module Switching Module 1.3.2.3 8260 TR Dual Fiber Repeater Module 10 1.3.3 Management and Controller Modules 1.3.3.1 8260 Distributed Management Module (DMM) Page Page Chapter 2. Backplane Architecture 2.1 LAN Segments on the Backplane pins 14 2.2 Ethernet Segments on the Backplane Ethernet Path SET MODULE {slot.sublsot} NETWORK {ethernet_n} or SET PORT {slot.port} NETWORK {ethernet_n} SHOW BACKPLANE_PATHS ETHERNET 16 digital collision detection parallel analog collision detection Data enable signal 18 Data in NRZ format Analog Collision Serial-ID Slot ID 2.2.1 Digital Collision Detection 2.2.2 Analog Collision Detection token-ring path 2.2.3 Statistics Collection 2.3 Token-Ring Segments on the Backplane SET MODULE {slot.sublsot} NETWORK {token_ring_n} SHOW BACKPLANE_PATHS TOKEN_RING 20 Page 2.4 FDDI Segments on the Backplane FDDI path SET MODULE {slot.sublsot} NETWORK {FDDI_n} SHOW BACKPLNE_PATHS FDDI 22 2.5 Network Allocations on the 8260 Backplane 24 Page 2.5.1 Management Buses 2.5.1.1 The Management LAN (MLAN) 26 2.5.1.2 The Serial Control Interface (SCI) Page Chapter 3. 8260 Fault Tolerant Controller Module 3.1 8260 Fault Tolerant Controller Module Overview 3.1.1 The Controller Module Front Panel 30 Page 3.1.2 Controller Module Fault Tolerance 3.1.3 Installing and Configuring the Fault Tolerant Controller Module 32 3.1.4 8260 Fault Tolerant Controller Module Considerations Page Chapter 4. 8260 Distributed Management Architecture 4.1 8260 Distributed Management Architecture 36 Page 4.1.1 IP Addressing for DMM 38 Page diag stby 4.2.2 DMM LED Indicators 40 Vers 4.2.3 Console and Auxiliary Ports console auxiliary 4.2.3.1 Modems for Connecting Terminals to DMM Set Terminal Hangup Enable 42 4.2.4 Configuring the DMM The following table is a quick reference to the tasks required to configure the DMM interface. Table 9. DMM Interface Configuration Quick Reference Table 10 (Page 1 of 2). DMM Terminal Defaultsand Options superuser 4.2.4.1 Configuring DMM Users User 44 Administrator Superuser 8260A> show login 8260A> clear login {index | all} 46 4.2.4.2 Resetting Superuser Password to Factory Default reset 4.2.4.3 Configuring Terminal Settings for DMM 8260> set terminal console baud 9600 8260> set terminal console data_bits 8 8260> set terminal console stop_bits 2 8260> set terminal console parity even 8260A> set terminal console mode command_line 8260> set terminal console mode slip 9.67.46.3 48 8260> set ip ip_address 9.67.46.1 slip 8260> set ip ip_address ff.ff.ff.f0 slip auxiliary console disable 4.2.4.4 Configuring DMM Device 8260> set clock 15:45 95/1/19 Thursday 50 8260A 8260A> set device diagnostics disable 8260A> set device mac_addr_order noncanonical 52 8260A> set device reset_mastership enable 8260A> set device dip_configuration disable 8260A> set device dip_configuration enable 8260A> set device trap_receiver enable 8260A> save device 4.2.4.5 Configuring DMM IP Parameters 8260A> set ip ip_address 9.67.46.235 token_ring_10 8260A> set ip subnet_mask ff.ff.ff.f0 token_ring_10 8260A> set ip default_gateway 9.67.46.238 token_ring_10 8260A> show ip 8260A> clear ip index 8260A> set ip active_default_gateway 9.67.46.238 4.2.4.6 Configuring DMM SNMP Parameters Read only 56 public 9.67.46.45 8260A> clear community index Authentication 8260A> set alert authentication enable Change 8260A> set alert change enable 4.3 The EC-DMM (Ethernet Carrier - Distributed Management Module) 4.3.1 Installing the EC-DMM diag rdy E1 stby 4.3.2 EC-DMM LED Description 60 4.4 MAC Daughter Cards all 62 subslot slot Page 4.4.1 Ethernet MAC Daughter Card (E-MAC) 4.4.1.1 Configuration E-MAC 64 mode 8260A> set module 2.2 interface {enable|disable|standby} options 8260A> set module 2.2 network ethernet_1 8260A> show module 1.2 verbose 4.4.2 Token-Ring MAC Daughter Card (T-MAC) 4.4.2.1 Configuring T-MAC 66 8260A> set module 6.2 locally_administered_address 40-00-00-82-60-a1 options mode 8260A> set module 6.2 early_token_release {enable | disable} 8260A> set module 6.2 monitor_contention {enable | disable} 8260A> set module 6.2 network token_ring_10 8260A> show module 6.2 verbose 68 4.5 Managing 8260 Using DMM and 8250 xMM 4.5.1 Managing 8260 with DMM 4.5.2 Managing 8260 with 8250 xMM 70 ONcore 4.6 Overview of Management and Control Commands system set ip set Page Chapter 5. 8260 Intelligent Power Management Subsystem 5.1 Intelligent Power Management Subsystem 5.2 Power Class SET POWER SLOT {slot} CLASS {1 to 10} 74 SHOW POWER SLOT {slot|all} 5.3 Configuring 8260 Power Supplies SHOW HUB 76 SHOW POWER BUDGET fault tolerant and non-fault tolerant 5.3.1 Non-Fault Tolerant Mode non-fault tolerant 78 SET POWER MODE non_fault_tolerant SHOW POWER MODE 5.3.2 Fault Tolerant Mode automatically SET POWER MODE fault_tolerant 80 5.4 Managing Power in the 8260 5.4.1 Installing 8260 Module in an 8260 Managed by DMM SHOW INVENTORY 82 5.4.2 Installing 8260 Module in an 8260 Not Managed by DMM 5.4.3 Installing 8250 Module in a Hub Managed by DMM module type 84 module type module Type 5.4.4 Installing 8250 Module in a Hub Not Managed by DMM 5.5 Controlling Power to the 8260 Modules SET POWER SLOT {slot} MODE {enable|disable} 5.6 Power Management Considerations 5.7 Power Management Scenarios show hub 86 show power mode 88 5.8 Installing the 8260 Power Supply Page Chapter 6. 8260 Intelligent Cooling Subsystem 6.1 Intelligent Cooling Subsystem SHOW HUB 92 SET OVERHEAT_AUTO_POWER_DOWN {enable|disable} enable trap receiver SHOW POWER MODE 94 Page Page Chapter 7. 8260 Ethernet Modules IBM 8250 Intelligent Hub and IBM HUB Management Program/6000, (GG24-4033) collision Ethernet 7.1 Ethernet LAN Overview 7.1.2 Frame Size LAN Concepts and Products, GG24-3178-03. 98 oversized packet 7.1.3 Data Integrity 7.2 8260 Ethernet 24-Port 10Base-T Module harmonica 100 Page 102 Page 7.3 10Base-T Module Usage 7.4 Configuring the 10Base-T Module 104 SET PORT {slot.port} AUTO_POLARITY {enable|disable} SET PORT {slot.port} LINK_INTEGRITY {enable|disable} SET PORT {slot.port} MODE {remote_diagnostics|non_remote_diagnostics} 7.5 8260 Ethernet 20/40-Port 10Base-T Module 106 Page Figure 69. Front View of 20/40-Port 10Base-T Modules 108 Table 19 describes the meaning of these LEDs: Table 19 (Page 1 of 2). 20/40-Port 10Base-T Module LED Descriptions Page 110 7.6 Configuring the 20/40-Port 10Base-T Modules SET PORT {slot.port} AUTO_POLARITY {enable|disable} SET PORT {slot.port} SQUELCH {normal|low} SET PORT {slot.port} LINK_INTEGRITY {enable|disable} 112 SET PORT {slot.port} MODE {remote_diagnostics|non_remote_diagnostics} 7.7 8260 Ethernet 10-Port 10Base-FB Module 114 Page 116 Page 7.8 10Base-FB Module Usage 7.9 Configuring the 10Base-FB Module 118 Page SET PORT {slot.port} HIGH_POWER {enable|disable} 7.10 8260 Ethernet Modules Summary 120 The following table provides a summary of the functions supported by the 8260 Ethernet modules. Table 25. 8260 Ethernet Modules Summary 7.11 8260 Ethernet Security Daughter Card network security address table auto-learning manual 7.11.1 Operation of Security Card method 2 122 jam pass 7.11.1.2 Eavesdropping Protection 7.11.2 Configuring the Security Module 8260A> set module 7.2 network ethernet_3 8260A> show security network ethernet_3 8260A> set security port 2.15 auto-learning enable 124 8260A> set security network ethernet_3 auto-learning enable 8260A> set security network ethernet_3 mode enable 8260A> show security address_table {all | group | port} 8260A> set security network ethernet_3 auto-learning disable 8260A> set security address_table address 10-00-5a-82-59-32 delete 8260A> save security address_table 126 8260A> set security port 2.15 jamming enable 8260A> set security network ethernet_3 eavesdrop_protection enable 8260A> set security network ethernet_3 intruder_reporting enable 8260A> show security intruder_table chronological failsafe 8260A> set security network ethernet_3 intruder_jamming enable 8260A> set security network ethernet_3 intruder_port_disabling enable Page Chapter 8. 8260 Token-Ring Support Token-Ring Network Architecture Reference (SC30-3374) single-token protocol frame 8.1 Token-Ring LAN Overview 8.1.2 Ring Administration 8.1.2.1 Active Monitor 130 ring purge address-to-port mapping 8.1.3 Ring Errors 8.1.4 Differential Manchester Coding DC balanced 132 unbalanced baseband 8.1.5 Clock Recovery ring latency phase jitter standby monitors active monitor 8.2 8260 Backplane Signalling for TR Segments 134 Page 136 digital analog 8.3 Dual Phase Lock Loop bandwidth 138 narrowband wideband Page 140 8.4 Jitter Attenuator Daughter Card (JADC) 8.5 Passive Port Technology 8.6 Active Port Technology 142 rate of change 8.6.1 Per-Port Switching on the Active Modules 144 8.6.2 Static Switch on the Per-Port Switching Modules static switch SHOW PORT {slot.port} VERBOSE 146 SET PORT {slot.port} STATIC_SWITCH {enable|disable} 8.7 Signal Flow on the 8260 Token-Ring Modules 148 8.8 Speed Detection 8.8.1 Speed Detection on Active Modules 8.8.2 Speed Detection on Passive Modules SET MODULE {slot.subslot} SPEED_THRESHOLD {0 to 255} SET PORT {slot.port} SPEED_DETECT {enable/disable} 150 SHOW PORT {slot.port} VERBOSE 8.9 Beacon Recovery 8.9.1 Introduction beacon domain 8.9.2 Beacon Recovery in the 8250 SET PORT {slot.port} STATION_TYPE mac_not_present SET TRUNK {slot} RING_IN.{trunk port} NETWORK_MAP {external|internal} 152 internal external Page SET DEVICE BEACON_RECOVERY {enable|disable} SET DEVICE BEACON_TIMEOUT {number of second} 154 SHOW DEVICE 8.9.3 Beacon Recovery in the 8260 8.9.3.1 Recovery ASIC SH MODULE {slot.subslot} VERBOSE 156 8.9.3.2 Ring Monitor on the Per-Port Switching Module 8.9.4 Beacon Recovery on the Module Switching Modules 158 8.9.5 Beacon Recovery on the Per-port Switching Modules 8.10 Address-to-Port Mapping for Module Switching Modules 160 SHOW RING_MAP TOKEN_RING LOGICAL token_ring_n or SHOW RING_MAP TOKEN_RING LOGICAL isolated_n {slot} 8.10.1.1 Support for Fan-Out Devices 162 SET NETWORK TOKEN_RING token_ring_n MISMATCH_RESOLUTION enable 8.10.1.2 Support for MAC-less Stations 8.11 Address-to-Port Mapping for Per-Port Switching Modules 164 Page 8.11.1.1 Support for Fan-Out Devices 8.11.1.2 Support for MAC-Less Stations 166 8.12 IEEE 802.5C Recommended Practice for Dual Ring Wrapback Reconfiguration primary ring secondary ring wrapback 8.12.1 Trunk Wrapping on the Active Per-Port Switching Modules 168 8.12.2 Trunk Wrapping on the Active Module-Switching Modules 8.12.3 Merge Manager 8.12.4 Trunk Unwrapping on the Per-Port Switching Modules 170 8.12.5 Trunk Unwrapping on the Module-Switching Modules Page Page Chapter 9. 8260 Token-Ring Modules 9.1 Introduction IBM 8250 Intelligent Hub and IBM HUB Management Program/6000, 9.2 Configuring Token-Ring Network Parameters SET NETWORK {network} BCN_RECOVERY {enable|disable} 9.3 8260 18-Port Active Per-Port Switching Module 174 Page 176 9.3.1 Configuring the 18-Port Active Per-Port Switching Module static_switch SET PORT {slot.port} STATIC_SWITCH {enable|disabled} 178 SET TRUNK {slot} RING_IN NETWORK {network} or SET TRUNK {slot} RING_OUT NETWORK {network} SET TRUNK {slot} RING_IN MODE {enable|disable} or SET TRUNK {slot} RING_OUT MODE {enable|disable} 180 9.4 8260 18-Port Active Module Switching Module 9.4.1 Configuring the 18-Port Active Module Switching Module SET MODULE {slot.subslot} NETWORK {network} 9.5 8260 20-Port Passive Module Switching Module Page 182 9.5.1 Configuring the 20-Port Passive Module SET PORT {slot.port} SPEED_DETECT {enable|disable} SPEED MISMATCH 184 SPD THRESHOLD EXCEEDED SET MODULE {slot.port} SPEED_THRESHOLD {0-255} 9.6 8260 Dual Fiber Repeater Module 186 Page 9.6.1 Configuring the Dual Fiber Repeater Module bcn_threshold 188 SET PORT {slot.port} STATIC_SWITCH {enable} SET TRUNK {slot} RING_IN.n NETWORK {network} or SET TRUNK {slot} RING_OUT.n NETWORK {network} Page Page Chapter 10. 8260 RMON Support 10.1 RMON Overview 10.1.1 Network Probes 192 10.1.2 RMON Manager 10.2 RMON Goals 10.2.1 Offline Operation 194 10.2.2 Preemptive Monitoring 10.2.3 Problem Detection and Reporting 10.2.5 Multiple Managers 10.3 Standards rfcxxxx tools sendto almvma arcnet rfc get rfcxxxx txt 10.4 Managing the Ethernet LAN Environment 10.4.1.1 Statistics Group 196 Page 10.4.1.2 History Group etherHistoryOctets 198 10.4.1.3 Alarm Group 10.4.1.4 Host Group 10.4.1.5 Host Top N Group 200 10.4.1.6 Matrix Group 10.4.1.7 Filter Group 10.5 Managing the Token-Ring LAN Environment Token-Ring Network Architecture Reference, 10.5.1 Managing Token-Ring LANs with RMON 10.5.1.1 Statistics Group Promiscuous 202 The Token-Ring MAC-Layer Statistics Group: MAC-Layer Page 204 Receiver Congestion. Active Monitor Present MAC frame 206 The Token-Ring Promiscuous Statistics Group: Page 10.5.1.2 History Group tokenRingMLHistoryMacOctets 208 MAC-Layer History Group: Promiscuous History Group: 10.5.1.3 Ring Station Group RingStationControlTable Duplicate Address errors Line errors Beacon errors 10.5.1.4 Ring Station Order Group 210 10.5.1.5 Ring Station Configuration Group Remove Station MAC frame. 10.5.1.6 Source Routing Group 10.6 Monitoring Functions Supported In 8260 212 8260A> show interface 10.6.1 Monitoring Functions Supported by E-MAC 10.6.2 Monitoring Functions Supported by T-MAC 214 10.6.3 SHOW COUNTER Command for Ethernet Networks SHOW COUNTER ETHERNET {ethernet_n | isolated} SHOW COUNTER INTERFACE {ethernet_n | isolated} SHOW COUNTER REPEATER {network} MODULE {slot} or SHOW COUNTER REPEATER {network} PORT {slot.port} 216 SHOW COUNTER RMON HOSTS {network} {all | mac_address} SET RMON HOST INTERFACE {index} 10.6.4 Collecting and Displaying RMON Groups Using E-MAC 218 interface index set module {slot.subslot} interface enable set module {slot.subslot} rmon_probe enable SET RMON HOST INTERFACE {interface index} SET RMON HISTORY INTERFACE {interface index} SET RMON STATISTICS ETHERNET INTERFACE {interface index} 220 8260> set rmon host ethernet interface 3 SHOW RMON {rmon_group} CONTROL ALL SHOW RMON statistics ETHERNET CONTROL ALL SHOW RMON {rmon group} DATA {control_index} {data_index} DMM Command Guide, 10.6.5 SHOW COUNTER Command for Token-Ring Networks SHOW COUNTER TOKEN_RING {token_ring_n} 222 SET MODULE {slot.subalot} DOT5_GROUP enable SHOW COUNTER INTERFACE {token-ring_n | isolated} SHOW COUNTER RMON HOSTS {network} {all | mac_address} 224 SET MODULE {slot.subslot} RMON_HOST_STATS enable SHOW COUNTER RMON RING_STATION {network} {all | mac_address |ring} 226 SET MODULE {slot.subslot} RMON_RING_STATION_STATS enable SHOW COUNTER RMON TR_MAC_LAYER {network} SET MODULE {slot.subslot} RMON_MAC_LAYER_STATS enable 228 SHOW COUNTER RMON TR_PROMISCUOUS {network} SET MODULE {slot.subslot} PROMISCUOUS_STATS enable SHOW COUNTER RMON TR_SOURCE_ROURING {network} SET MODULE {slot.subslot} SR_ROUTING_STATS enable 10.6.6 Collecting and Displaying RMON Groups Using T-MAC interface index SET MODULE {slot.subslot} INTERFACE enable 230 Page SHOW COUNTER RMON {rmon group} {network} 10.7 Surrogate Functions Supported by T-MAC 232 10.7.1 Using T-MAC Surrogate Functions 10.7.1.1 Enabling Surrogate Features SET TR_SURROGATE {slot.subslot} SURR_STATUS REM_ADMIN SET TR_SURROGATE {slot.subslot} SURR_STATUS CRS_ADMIN SET TR_SURROGATE {slot.subslot} SURR_STATUS RING_SEGMENT 10.7.1.2 Enabling Individual Options within the Surrogate Groups 234 DMM Command Guide SHOW TR_SURROGATE {slot.subslot} REM_STATUS SHOW TR_SURROGATE {slot.subslot} CRS_STATUS SHOW TR_SURROGATE {slot.subslot} CRS_STATION ALL 10.7.2 Displaying the Information Collected by Surrogate Features SHOW TR_SURROGATE {slot.subslot} REM_ERROR_MAC_FRAME 236 SHOW TR_SURROGATE {slot.subslot} REM_ISOLATING SHOW TR_SURROGATE {slot.subslot} REM_LAST_BEACON 10.8 DOT5_Group Support by T-MAC 10.8.1 Using DOT5_Group Functions SET MODULE {slot-subslot} DOT5_GROUP enable SHOW COUNTER TOKEN_RING {token_ring_n} 10.9 Summary of T-MAC Monitoring Functions 238 Chapter 11. 8260 Multiprotocol Interconnect Module 11.1 Introduction 240 Page 11.2 Power Requirements for Multiprotocol Interconnect Module 242 Page Do you want to enter this into module x.ys EEPROM (Y/N): Y 244 BOOT 11.3 Bridging Functions 11.4 Routing Functions 11.4.1 IP Routing Support 11.4.1.1 RIP Implementation 11.4.1.2 OSPF Implementation 11.4.2 IPX Routing Support 11.4.3 DECnet Phase IV Routing Support 246 11.5 Configuring Multiprotocol Interconnect Module SET PORT {slot.port} NETWORK {ethernet_n|isolated} 11.6 Local Management System (LMS) 248 Page Close Connection 11.7 SNMP Support community name 250 trap receiver 11.8 Configuring the Interconnect Module Using LMS configuration write 11.8.1 Configuring System Wide Parameters 252 Page 254 Start BOOTP Download Start Serial Download Configuration Menu Port Menu 11.8.2 Configuring Port Parameters Physical Port Interface Parameters 256 Logical Port Parameters Logical Port Multilink Parameters 11.8.2.1 Configuring Physical Port Parameters Next Page name Port Menu 11.8.2.2 Configuring Physical Port Protocol Parameters 258 Commands Ring Speed Act Mon Par Funct MAC Addr Mask 11.8.2.3 Configuring Logical Port Parameters Attached Physical Port 260 other Down 11.8.3 Port Configuration Summary 11.8.4 Configuring for Bridging Support 11.8.4.1 Configuring for Transparent Bridging Bridging System Parameters 262 disabled SRT Bridge Number Page 264 Page 266 11.8.4.2 Configuring for Source-Route Transparent Bridging 268 STP Port Parameters 11.8.4.3 Configuring for Translational Bridging Conversion System Parameter SNAP Conversion IPX Conversion 11.8.5 Filtering for Bridging Functions permanent 270 learned 11.8.5.1 Transparent Bridging Filtering Database MAC Address Scope discard flood port number 272 Static (*) forwarding Bridging Freeze Database 11.8.5.2 Operating Modes for Bridging Ports Normal Mode Security Mode Transparent Bridging Port 11.8.6 Destination Address Filtering disposition 274 flood Always Accept Multicast Filter Test Table Bridge Menu Test Name Custom Filter Test Table ID Number 276 value Bridge menu Custom Filter Statement Table Cancel Page Custom Filtering Transparent Bridging Port Parameters Protocols Menu Source Routing Bridging Port Parameters 11.8.7 Configuring for Routing Functions 278 11.8.8 Configuring for IP Routing IP IP Port Address Table IP system Parameters 280 IP Routing RIP Router ID IP Security ARP timeout 282 IP Routing RIP IP Mtu RIP Path Cost LAN Encapsulation 284 hostid static routes Security Access List n IP Forwarding Table Page Network Address 286 Physical Address Boothelper Cancel Set Entry Boothelper Parameter Protocols Menu Forward Address Boothelper Forward Address 11.8.8.1 Configuring for OSPF OSPF System 288 Area Border Router Router ID TOS Support Admin Status AS Boundary Router 290 Default Action on No Match for RIP Routes OSPF Menu OSPF Interface Table import Page 292 Auth Type Import AS Extern LSA SPF Runs Brdr Router Area LSAs 294 TOS one OSPF Area Address Range Range Net Range Mask Menu OSPF Interface Metric Table 296 Neighbor TransDelay RetransiInt HelloInt RtrDeadInt 298 OSPF Neighbors IP Address Port Router ID Options Page IP Address 300 IP Mask OSPF RIP Default Convert Table RIP Default Conversion Table Static Route Filter Table 302 Page 11.8.9 IP Security Security Tables 304 IP Security Table IP security tables ID Protocol operand pass block 306 List No. List No Transmit Check Action on No Match Receive Check 11.8.10 Configuring for IPX Routing 308 Page IPX Port Routing 310 Host Number Network Number Interface Delay Encapsulation 11.9 Monitoring Multiprotocol Interconnect Module Station Statistics Buffer Pool Table 312 Page Page Appendix A. Power Requirements for 8250/8260 Modules A.1 Power Requirements for 8250 Ethernet Modules Table 41. Power Requirements for 8250 Ethernet Modules A.2 Power Requirements for 8250 Token-Ring Modules Table 42. Power Requirements for 8250 Token-Ring Modules 316 A.3 Power Requirements for 8250 FDDI Modules Table 43. Power Requirements for 8250 FDDI Modules A.4 Power Requirements for 8250 Internetworking Modules Table 44. Power Requirements for 8250 FDDI Modules Page Index Numerics A B C 320 D E 322 F I J L 324 M N O P R S T 326 V Page ITSO Technical Bulletin Evaluation RED000 BUSINESS REPLY MAIL