User`s guide

Chapter 2:
Connecting to the Network
Page 2-2 FDDI Dual-Attached Intelligent Module User’s Guide
2.1.1 Dual-attached Station
A dual-attached station (DAS) is connected to both the primary and
secondary FDDI rings. This is the preferred configuration, since it
provides the full benefits of dual-ring operation, allowing the network to
continue to operate if a station or cable fails.
Figure 2-1 shows the ATX, with a 3F00-01 installed, connected as a DAS
to two other DASs in an FDDI network. (A and B indicate A port and B
port.) When DAS devices are connected on an FDDI ring, A ports must be
connected to B ports, and B ports must be connected to A ports.
Figure 2-1 Dual-attached Configuration
POWER STATUS ENGINE STATUS TURBO STATUS SUPPLY A SUPPLY B 1.6 Gbps
RESET
PACKET PROCESSING ENGINE
NMS PORT
POWER
FastNET ATX
TX
FDDI MIC A FDDI MIC BOPTICAL BYPASS
RING A RING B
THRU
WRAP
RX
ACT ACT
THRU
WRAP
POWER
STATUS
DAS
DAS
B
ABA
AB
ATX
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