Specifications

A.12 Dual Ring Configuration Examples

A–28 FDDI Configuration Capabilities

Figure A–23 Building Block Representation of Example 2

A.12.3 Example 3 — PEswitch 900TX Connections to External Dual Ring

The PEswitch 900TX module can be configured into a dual ring, however, because

the module does not have front panel FDDI port connectors, two DECswitch 900EF

modules or two DECconcentrator modules (in any combination) are required to com-

plete the connection to an external FDDI network.

As shown in Figure A–24, the FDDI dual ring connections to a PEswitch 900TX are

made by means of the DEChub 900 backplane: (1) the dual ring enters through the

DECconcentrator 900TH; (2) it then passes through the DEChub 900 backplane to a

PEswitch 900TX; (3) from the PEswitch 900TX it again passes through the DEChub

900 backplane to exit through a DECswitch 900EF

LKG-10087-96F

BBAA

Trunk