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Overview
Auto MDI/MDI-X
An RJ-45 twisted pair port on a 10 Mbps or 100 Mbps Ethernet network device
can have one of two possible wiring configurations: MDI or MDI-X. The RJ-45
port on a PC, router, or bridge is typically wired as MDI, while the twisted pair
port on a switch or hub is usually MDI-X.
To connect two 10 Mbps or 100 Mbps network devices together that have
dissimilar port wiring configurations, such as MDI to MDI-X, you would use a
straight-through twisted pair cable. To connect two network devices that have
the same wiring configuration, such as MDI to MDI, you would use a crossover
cable.
When a port on the AT-FS7016 or AT-FS7024 switch is set to Auto-negotiation,
the switch enables the auto MDI/MDI-X feature. The RJ-45 port automatically
determines the configuration of the port on the device to which it is connected
and then configures itself appropriately. This features allows you to use either
a straight-through or crossover cable when connecting a device to the twisted
pair port.
The auto MDI/MDI-X feature is available only when a port is set to Auto-
negotiation. If Auto-negotiation is disabled, the port defaults to MDI-X. In this
case you would use a crossover cable to connect the port to an end-node with a
MDI-X port (such as another switch).
RS-232 Terminal Port
The RS-232 Terminal Port is used to establish a local (out-of-band)
management session with the switch. To establish a local management session,
you connect either a VT100 terminal or a PC with a terminal emulation
program to the port.
The RS-232 Terminal Port has a DB-9 female connector and uses a straight-
through RS-232 cable (not provided). The default settings for the RS-232
Terminal Port are:
Bits per second: 9600
Data bits: 8
Parity: None
Stop bits: 1
Flow control: None
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