Specifications

vii
6–4
Multi-Ethernet Hub, LAN Interconnect Window . . . . . . . . . . . . . . . . . . . . . . 6-8
6–5
Multi-Ethernet Backbone Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11
6–6
Central Department LAN Interconnect Window. . . . . . . . . . . . . . . . . . . . . . . 6-12
6–7
Department 4 LAN Interconnect Window. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
6–8
Collapsed Fiber Optic Ethernet Backbone. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16
6–9
Central Department LAN Interconnect Window. . . . . . . . . . . . . . . . . . . . . . . 6-17
6–10
Building 3 LAN Interconnect Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
6–11
Shared FDDI Backbone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20
6–12
Shared FDDI Backbone, LAN Interconnect Window . . . . . . . . . . . . . . . . . . . 6-21
6–13
Large Network with Switched Backbone . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23
6–14
Large Network with Switched Backbone, LAN Interconnect Window . . . . . 6-24
6–15
Remote Access Using Routers and Access Servers. . . . . . . . . . . . . . . . . . . . . 6-26
6–16
Connecting Remote Sites to a Cisco Backbone. . . . . . . . . . . . . . . . . . . . . . . . 6-28
A–1
Dual Ring Port Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4
A–2
Tree Port Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
A–3
DECconcentrator 900MX Port Configuration Capabilities. . . . . . . . . . . . . . . A-6
A–4
DECconcentrator 900TH Port Configuration Capabilities . . . . . . . . . . . . . . . A-7
A–5
DECconcentrator 900FH Port Configuration Capabilities . . . . . . . . . . . . . . . A-8
A–6
DECswitch 900EF Port Configuration Capabilities . . . . . . . . . . . . . . . . . . . . A-9
A–7
PEswitch 900TX Port Configuration Capabilities. . . . . . . . . . . . . . . . . . . . . . A-10
A–8
Ring Building Blocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
A–9
Tree Building Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-13
A–10
DECconcentrator Tree Connections in Hub Backplane . . . . . . . . . . . . . . . . . A-18
A–11
Building Block Representation of Example 1 . . . . . . . . . . . . . . . . . . . . . . . . . A-18
A–12
Tree Connections with Switches and Concentrators . . . . . . . . . . . . . . . . . . . . A-19
A–13
Building Block Representation of Example 2 . . . . . . . . . . . . . . . . . . . . . . . . . A-20
A–14
Tree Connections to an External FDDI Network. . . . . . . . . . . . . . . . . . . . . . . A-21
A–15
Building Block Representation of Example 3 . . . . . . . . . . . . . . . . . . . . . . . . . A-21
A–16
External Dual Homed Connections to an FDDI Network . . . . . . . . . . . . . . . . A-22
A–17
Building Block Representation of Example 4 . . . . . . . . . . . . . . . . . . . . . . . . . A-23
A–18
Hub-Based Tree Connections to an External FDDI Network . . . . . . . . . . . . . A-24
A–19
Building Block Representation of Example 5 . . . . . . . . . . . . . . . . . . . . . . . . . A-24
A–20
DECconcentrator Dual Ring Connected to an FDDI Network . . . . . . . . . . . . A-26
A–21
Building Block Representation of Example 1 . . . . . . . . . . . . . . . . . . . . . . . . . A-26
A–22
Dual Ring Connections for DECswitch 900EF . . . . . . . . . . . . . . . . . . . . . . . . A-27
A–23
Building Block Representation of Example 2 . . . . . . . . . . . . . . . . . . . . . . . . . A-28
A–24
Dual Ring Connections for PEswitch 900TX . . . . . . . . . . . . . . . . . . . . . . . . . A-29
A–25
Building Block Representation of Example 3 . . . . . . . . . . . . . . . . . . . . . . . . . A-29
A–26
Self-Contained Dual Ring in the Backplane . . . . . . . . . . . . . . . . . . . . . . . . . . A-30
A–27
Ring Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-32
A–28
Tree Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-34
A–29
Token Flow through Dual Ringed DEChub 900 Modules . . . . . . . . . . . . . . . A-36
A–30
Token Flow through Treed DEChub 900 Modules . . . . . . . . . . . . . . . . . . . . . A-37
A–31
Legal Dual Ring of Trees Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-40
A–32
Illegal Dual Ring of Trees Topology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-41
A–33
Valid FDDI Configurations for DEChub FDDI Modules . . . . . . . . . . . . . . . . A-43