3Com 3C780 User Guide - Page 67

Plug the A and B Media Interface Connectors MIC connectors

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Installing the Hub 2-27 To detect the presence of an optical bypass switch on your system, enter the show obs command. To install an optical bypass switch with the configuration shown in Figure 2-11, follow these steps: 1. Plug the A and B Media Interface Connectors (MIC connectors) from a network device or another hub into the B and A receptacles on the optical bypass switch. The device's A connector must be placed in the B receptacle and the B connector in the A receptacle. 2. Plug the A and B MIC connectors of the optical bypass switch into the A and B ports on the FDDI hub (A to A and B to B). DAC B A FDDI hub 6-Pin mini-DIN A B Optical bypass switch DAS B A B Network devices DAC A DAS B A Figure 2-11. Cabling for Installing an Optical Bypass Switch

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2-27
Installing the Hub
To detect the presence of an optical bypass switch on your system, enter the
show obs
command.
To install an optical bypass switch with the configuration
shown in Figure 2-11, follow these steps:
1.
Plug the A and B Media Interface Connectors (MIC connectors) from
a network device or another hub into the B and A receptacles on the
optical bypass switch.
The device’s A connector must be placed in the B receptacle and the B
connector in the A receptacle.
2.
Plug the A and B MIC connectors of the optical bypass switch into the
A and B ports on the FDDI hub (A to A and B to B).
B
A
DAC
Optical bypass switch
B
A
A
B
DAS
DAC
DAS
B
A
A
6-Pin mini-DIN
B
FDDI hub
Network devices
Figure 2-11.
Cabling for Installing an Optical Bypass Switch