August 2012 – Ed.1.2
EQUITEL – E451 Technical manual
Page 8
Figure 6.
Output contact Electrical scheme
1.11
Network connectors
E451 has two Ethernet 10/100 Base-T/TX interfaces (Half or Full-Duplex) with automatic detection (
and
in Figure 4), supporting MDI and Auto MDIX.
Auto MDIX interface changes automatically from MDI to MDI-X and vice versa, allowing the connection of any
cable (straight or cross) regardless the direct connection to a computer or to a switch/hub.
E451 can be PoE powered, and the connector is named as “ETH/PoE” (
in Figure 4). When the unit is
correctly powered, the ON indicator (
in Figure 4) must light.
Each one of the two network connectors has a LED indicating the correct connection status. The Link LEDs for
the connector “ETH” and for “ETH/PoE” are the ones with the numbers
and
respectively in Figure 4.
1.11.1.
Daisy Chain
E451 intercoms can be connected using a
Daisy Chain
configuration (Figure 7) using their two RJ-45
connectors. This way we avoid the use of an external switch. However, in this case redundancy is lost:
should any of the E451 disconnect for any reason, all the successive intercoms will remain inaccessible.
Furthermore, it must be taken into account that E451 are not PoE injectors but passive devices. Therefore,
in a Daisy Chain only the unit connected to the PSE
(3)
will be powered through the network cable and the
others will have to be powered through an auxiliary power supply.
(3) PSE (Power Sourcing Equipment) are the units supplying power, such a s PoE switch.
14
13
12
11
11
10
