Keep the dust cap(s) on the ends of the cable and on the transceivers
of the adapter until the connections are ready to be made. This
prevents dirt and oils from soiling any important surfaces. Do not
attempt to polish the connectors with a cloth made of synthetic
fibers; this charges the fiber and attracts dust.
When connecting a fiber optic cable, do not stretch, puncture,
or crush the cable with staples or heavy equipment. Always maintain
the minimum bend radii specified by the cable manufacturer. The
fiber in fiber optic cable can suffer damage if the cable is bent
in small radii. The minimum bend radius is usually 10-20 times a
cable's outer diameter.
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 | CAUTION: Do not force the connectors when attaching the cable
— they are keyed connections and fit one way only. |
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There are two ways to connect the adapter to the FDDI network.
It can be connected directly to the adjacent stations in a dual-ring
network or to a concentrator (DAC or SAC), typically dual-homed
for additional fault tolerance. You can use an Optical Bypass Switch
(OBS) between the adapter and the dual ring. An OBS maintains continuity
of the primary and secondary ring when the station is powered down,
or in the event of an adapter failure.
Signals must be routed such that the primary Tx output from
each station is routed to the primary Rx input of its neighbors,
and the secondary Tx output is routed to the secondary Rx input
of the other neighbor, and so forth, as shown in Figure 2-2 “Dual-Ring Tx/Rx Topology”.
Single-Attachment MIC Adapter Connections |
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A single-attachment station (SAS) adapter cannot be connected
directly to the FDDI ring. It must be connected to an M port on
a single-attachment concentrator (SAC). The fiber cable used to
attach the adapter is normally a MIC connection at the concentrator
with M keying. The signals must be routed such that the Tx output
of one station is routed to the Rx input of its downstream neighbor.
To connect a SAS adapter to the concentrator, do the following:
Connect the cable from the adapter
to any available M port on the concentrator, as shown in Figure 2-3 “SAS MIC Connection”.
Recheck your connections, ensuring that each connector
is plugged into the correct Tx or Rx receptable or jack, as discussed
in the previous step.
Reconnect the AC power cord to the system and the
power source.
Power up the system.
The adapter runs a self-test automatically. During power up,
system messages may appear regarding the absence of the EISA configuration
for the adapter. You can safely ignore these messages since the
EISA configuration happens automatically after the adapter software
is installed.
Now that your adapter is installed, continue to Chapter 4 “Configuring and Verifying HP EISA
and HSC FDDI/9000”
Dual-Attachment MIC Adapter Connections |
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This section illustrates the dual-attachment MIC adapter connections.
There are two ways to connect the adapter to the FDDI network.
It can be connected directly to the adjacent stations in a dual-ring
network or to a concentrator (DAC or SAC), typically dual-homed
for additional fault tolerance. You can use an Optical Bypass Switch
(OBS) between the adapter and the dual ring. An OBS maintains continuity
of the primary and secondary ring when the station is powered down,
or in the event of an adapter failure.
Signals must be routed such that the primary Tx output from
each station is routed to the primary Rx input of its neighbors,
and the secondary Tx output is routed to the secondary Rx input
of the other neighbor, and so forth, as shown in Figure 2-2 “Dual-Ring Tx/Rx Topology”.
MIC connectors are individually keyed to fit type A or type
B ports. The key is located in the slot on one side of the connector.
Be sure the key type of the plug matches the port type on the adapter.
Connecting Directly to the Dual Ring
This adapter can be connected directly to the dual ring by
connecting the A and B ports of its neighbors.
During normal operation of a dual ring with no faults, each
station receives and transmits all traffic on the primary ring,
while the secondary ring is idle. If a station is turned off or
disconnected from the ring, neighboring stations detect this as
a fault or discontinuity, and wrap the traffic onto the secondary
ring, thus keeping remaining stations in communication. However,
if a second fault occurs during this time, the ring could become
segmented, separating groups of stations into independent rings.
An Optical Bypass Switch (OBS) can be used to bypass a station that
is turned off or disconnected, protecting against multiple faults
on a dual ring. Figure 2-6 “Optical Bypass Switch Configuration” shows
the connection of the OBS to a dual ring.
To connect an EISA FDDI adapter to a dual ring using an OBS,
do the following:
Connect the cables from the OBS to
the appropriate Phy A and Phy B ports on the adapter.
Connect the control cable from the OBS to the adapter.
The optical bypass socket on the adapter is a 6-pin mini-DIN connection.
Connect the cables from the FDDI network to the
appropriate ports on the OBS.
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