Instruction manual

3. Preparation of Interface Cables and Terminals
72
3.2 Details about interface cables
NOTE
To allow for Switch maintenance, fiber optic cables should be the
necessary length (3 m), and the excess cabling should be bundled
near the Switch. When fiber optic cables and other interface cables
are used together, be sure to avoid applying excessive stress on the
fiber optic cables.
NOTE
Always have extra fiber optic cables ready in addition to the ones in
use.
3.2.1 UTP cables (10/100/1000BASE-T)
For information about UTP cables, see the following table.
Table 3-2 Physical specifications for 10/100/1000BASE-T
Physical specifications Item
10BASE-T 100BASE-TX 1000BASE-T
Category
Category 3 and
higher
Category 5 and
higher
Enhanced category
5 and higher
Transmission
distance (max.)
100 m 100 m 100 m
NOTE
The 10BASE-T, 100BASE-TX, or 1000BASE-T port on a Switch
supports Auto MDI/MDI-X functionality. If the Auto MDI/MDI-X
functionality is enabled, either a straight-through cable or a crossover
cable can be connected, regardless of the connection target.
NOTE
The Auto MDI/MDI-X functionality is enabled only when
auto-negotiation is specified for a 10/100/1000BASE-T port.
The factory default setting is auto-negotiation.
NOTE
If the Auto MDI/MDI-X functionality is disabled, the
10/100/1000BASE-T port of the Switch is fixed to MDI-X.
Use a straight-through cable if the port at the connection target is MDI,
and use a crossover cable if the port is MDI-X.
For information about the pin configuration of the 10/100/1000BASE-T
port when the Auto MDI/MDI-X functionality is disabled, see the
following table.
Table 3-3 Pin configuration of the 10/100/1000BASE-T port
Physical specifications RJ45
Pin number
10BASE-T 100BASE-TX 1000BASE-T
1 Receive (+) (A) Receive (+) (A) Send/receive A (+) (A)
2 Receive (-) (a) Receive (-) (a) Send/receive A (-) (a)