Specifications

Functions

4.2

Hardware functions

RS2-4R

Release

1.0

03/04

4.2.3 Autopolarity exchange

If the receive-line pair of a twisted pair cable is incorrectly connected (RD+

and RD- are reversed), polarity is reversed automatically.

4.2.4 Autocrossing

If the autonegotiation function is active, the RS2-4R detects the transmit and

receive pairs (MDI, MDI-X). The

RS2-4R automatically configures its port for

the correct transmit and receive pins. Consequently it does not matter wheth

er you connect devices using a cross-over or straight cable.

4.2.5 Line monitoring

U Twisted pair

Using regular link-test pulses in accordance with the IEEE 802.3

10BASE-T/100BASE-TX standard, the

RS2-4R monitors the connected

TP line segments for short circuiting or interruptions. The

RS2-4R does

not send any data to a TP segment from which it does not receive a link-

test pulse.

Note: An unassigned interface is interpreted as a line interruption. The TP

line to a deactivated terminal device is also interpreted as a line interrup

tion, since the connected device is unable to send link-test pulses.