Copyright 2017 Positron, Inc.
13
2.3.6
Type 2a and Type 2b, PSE
720920xxx TeleLite PSE
(OEI)
Ethernet Card Feeding On-Site Modem(s)
A. The 720920xxx POE Ethernet card can only be locally powered by a source of -48Vdc. As
such there are no power jumpers to set on this card.
B.
In a “Campus” Ethernet transport configuration, either the OEI (720920xxx) or CFJ
(720930xxx) can be set to Master or Slave since both ends of the transport can be
assumed to be attended for alarming purposes. The only criterion is that one card must be
set to Slave and the other to Master. In this example, the CFJ (720930xxx) TeleLite
Ethernet card has been set as Master. (See 1.5.4.1) This 720920xxx OEI Ethernet card
has been set as Slave. (Figure 23)
C. If this is a Type 2a or Type 2b Ethernet deployment as described in Section 1.5.4, the 2
nd
DIP switch should be set to the left. (Figure 23)
D. If the Ethernet modem fed by the 720920xxx PSE TeleLite Ethernet cards is MDIX
enabled
(5)
, then the MDIX feature of the TeleLite Ethernet card should be disabled. If the
associated modems are NOT MDIX enabled, then this DIP switch should be enabled to
remove any need for crossover cables. With this feature enabled or disabled appropriately,
there is never a need with TeleLite Ethernet cards to provision the site with anything but a
straight CAT 5 cable. In this example the Ethernet Modem is MDIX enabled and the feature
on the TeleLite Ethernet card is disabled. (Figure 23)
E. If the 720920xxx card is to provide PSE to a terminating modem, the 4
th
DIP Switch is set
to the left. If the Ethernet modem at the OEI is locally powered by a source of -48Vdc, then
the 4
th
DIP switch is set to the right. In this example, PSE is enabled. (Figure 23)
5
defines a
medium dependent interface crossover
(MDI-X) interface.
Auto MDI-
X
ports on newer network interfaces detect if the connection would require a crossover, and automatically chooses
the MDI or MDI-X configuration to properly match the other end of the link.
Figure 22: Default DIP Switch Positions
Figure 23: Meeting conditions B, C, D, & E
720920SSC
PSE
TeleLite Card (OEI)
Figure 21: 4 ports of
720920xxx
provide
PSE, if enable (DIP
Switch 4)
