User manual

Startup and Functions
6874_en_09 PHOENIX CONTACT 3-21
3.2.7.3 Functions of the Twisted Pair Interface
– Auto negotiation
Auto negotiation is a method whereby the switch automatically detects the operating
parameters for the connected network and sets the corresponding parameters
(10 Mbps/100 Mbps data transmission rate and half/full duplex transmission mode) for
its RJ45 ports. Automatic port setting eliminates the need for manual intervention by
the user. The auto negotiation function can be activated/deactivated via the web
interface.
– Auto crossing
There is no need to distinguish between 1:1 and crossover cables, as the transmit and
receive cables are crossed automatically.
– Auto polarity
The polarity is changed automatically by the switch if a pair of twisted pair receive
cables (RD+ and RD-) are connected incorrectly.
– Line monitoring
The switch uses link test pulses according to standard IEEE 802.3 at regular intervals
to monitor the connected TP/TX cable segments for short circuits and interrupts.
3.2.7.4 Network Connection
See "FL IF 2TX VS-RJ ..." on page 3-9 and onwards, and "FL IF 2HCS 100 ..." on
page 3-14 and onwards.
Auto crossing is only available if auto negotiation is activated.
Ports that are not being used are considered cable interrupts. In addition, a TP/TX path
to a deactivated termination device is also considered a cable interrupt, as the connected
device cannot send a link test pulse because it is switched off.