User manual

FL SWITCH MM HS
3-20
PHOENIX CONTACT 6874_en_09
– 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.
3.2.6.4 Network Connection
See "FL IF 2TX VS-RJ ..." on page 3-9 and onwards, and "FL IF 2POF 10/100 ..." on
page 3-11 and onwards.
3.2.7 FL IF TX/HCS 100 ...
3.2.7.1 Default Upon Delivery
When the interface modules are inserted, the auto negotiation and auto crossing functions
are activated for the twisted pair port, and the data transmission rate is set to 100 Mbps full
duplex for the HCS port. Port monitoring is not activated for the two ports.
3.2.7.2 Functions of the HCS Interface
– Line monitoring
According to standard IEEE 802.3, the switch monitors the connected fiber optic
cables for interrupts.
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.
The switch position for transmission power reduction will only be indicated in the web
interface in future hardware versions.
Hot plugging
When inserting and removing interface modules, you do not have to switch off the supply
voltage. The interface modules are detected automatically and logged to the network
management.
If an interface module is inserted in an MMS that has already been parameterized, the
existing configuration remains active.
Ports that are not being used are considered cable interrupts. In addition, an HCS 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.