3Com 3C16895, Installation Manual

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42 C
HAPTER
2: I
NSTALLING
T
HE
S
WITCH
7750
CAUTION: When connecting an SC fiber connector, the switch TX must be
connected to the RX of the device on the network, and the switch RX must be
connected to the TX of the device on the network.
MT-RJ fiber connector
The 24-port 100BASE-FX MMF FE module requires an MT-RJ optical fiber
connector.
To attach the MT-RJ fiber connector:
1 Plug the MT-RJ fiber connector in the optical port into the module.
2 Connect the other end of the fiber connector to the corresponding device.
Installing
Cabling
This section describes how to install and bind cables for your Switch 7750.
Bench-Mounted Switch If you have installed your chassis on a bench, all interface cables run on the left
side of the chassis in the cabling channel, and the chassis power cords run by the
rear chassis panel.
Rack-Mounted Switch If you have installed your switch in a 19-inch standard rack, the cables are bound
on the cable binding rack at the left side of the chassis and arranged to run on the
cable rack or under a raised floor. Collect all the transit data signal cable
connectors and locate them on the floor of the chassis. Power cords run out of the
rear left of the chassis and on a cable rack or under a raised floor.
Cable Binding Keep the following precautions in mind as you bind cables:
■
Do not allow cables to twist or bend as you bind them.
■
The cable body cannot be bent at an angle that is more than twice its diameter.
The cable running out of a connector cannot be bent more than five times its
diameter.
■
Different types of cables (power cord, signal cable, and ground wire) should
not be bound together in a cabinet. Although different types of cable may
cross over each other, they must not be bound together where they cross. For
parallel cabling, the space between a power cord and a signal cable should be
no less than 30 mm (1.25 in).
■
The cable binding rack and cable channel inside and outside a cabinet should
be smooth.
■
The hole through which a cable runs through should be smooth or have a
rubber grommet.
■
Use plastic cabling ties to bind the cables.
■
Bind cables before bending them. Ensure that no tie binds the bent part of any
cables to prevent the core of the cable from breaking.
■
Do not tie power cables to the guides of any mobile components.
■
For the cable terminals fixed with screws, the screws or nuts should be
fastened securely.
■
Do not use tapping screws to fasten the cabling terminals.