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Above configuration (Fig 3-2) is particularly useful in a lab/shop environment where DOCSIS is
available but without power. A power injector
powers the SMC8511 through the Ethernet port.
injector (no 48 VDC injectors), and do not use a power injector which places DC voltage on the
data leads.
See Section 3.4 for connections.
3.3
Power Output to PoE
When the SMC8511 Outdoor Cable Modem is powered from the CATV system through its F-
connector interface, it can optionally
power the external Ethernet device. The wiring /pin connections are given in Figure 3-3, below.
3.4
PoE Wiring
When the SMC8511 Outdoor Cable Modem is powered by means of PoE the connections are
given in Figure 3-3, below.
When the SMC8511 Outdoor Cable Modem is powered by 60-90 VAC CATV system power it can
optionally provide 24 VDC output to an attached Ethernet device. The connections for this
application are also as given in Figure 3-3, below.
Note that this PoE implementation differs from both the IEEE 802.3-2005 and draft IEEE 802.3af
Do not exceed 28VDC into the power injector (no 48 VDC injectors), and do not
standards.
use a power injector which places DC voltage on the data leads.
2
such as the SENAO PoE injector readily available on the Internet
2
fed with 24 VDC with at least 1 amp capacity
Note: Do not exceed 28VDC into the power
provide
24 VDC at 0.5 amps
Pin
Input /
Output
1
Tx (+)
2
Tx (-)
3
Rx (+)
4
+V
5
+V
6
Rx (-)
7
GND
8
GND
Figure 3-3 PoE Wiring
- 8 -
from
the Ethernet port to
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