User manual

Startup and Functions
6874_en_09 PHOENIX CONTACT 3-23
– When starting the MMS, the data is read from a plugged-in memory module (display
indicates "OP") and used as the active configuration. The data in the Flash memory is
overwritten by the data from the memory module.
3.2.8.4 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.
3.2.8.5 Network Connection
See "FL IF 2TX VS-RJ ..." on page 3-9 and onwards.
Please note that the password stored on the memory module is also transmitted to the
MMS. Make sure that you know the password for the configuration on the memory
module.
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.