User's Manual

Chapter 2: Installation Requirements
LAN Installation: Ethernet
22 Teklogix 9150 Wireless Gateway User Manual
2.2.3.4 9100 PowerBaseT Mid-Span Power Supply
Overview
The 9100 PowerBaseT module is designed to provide power over Ethernet and may
be referred to as a “mid-span power supply” in that it intercepts the Ethernet cables
between a hub/switch and the DC-powered 9150DC, as illustrated in Figur e2.5 on
page 23. The 9100 has an internal, universal AC/48VDC power supply and routes
DC power to each of its independent Data + 48V output Ports, following successful
detection of a suitable powered device (a 9150DC). The Resistor Detection method
is employed for this purpose, following application of power to the 9100, or connec-
tion of a powered device to a powered-on Port. The 9100 determines whether each
connected device needs to be powered or not by determining if there is a signature
resistor in the powered device between the 4/5 and 7/8 “spare” wire pairs. Subse-
quent disconnection of such a device is also detected. There are four identical, inde-
pendent resistor/transistor networks, one for each output port. 48VDC is supplied
via the unused pairs of a standard Ethernet Category 5 cable, while the Ethernet data
lines (4 of the 8 conductors in the cable) are passed through the 9100 to the 9150DC.
The 9150DC can accept power via either the unused pairs, or via the data pairs of a
10/100BaseT system connected to a suitable Power Over Ethernet switch/hub.
Important: The 9100 does not contain any transceivers (the data signals are
passed through) and is therefore subject to the 100 m cable length
limitation (including the cable from the hub/switch to the 9100
PowerBaseT and any subsequent length added to the 9150DC).
The 9100 PowerBaseT provides power for up to four 9150DCs (13 Watts per
channel maximum), connected by twisted pair cables up to 100 m in length. See
page 206 for power specifications.
Figure 2.4 The 9100 PowerBaseT
Console Port
RJ-45 Ports include LEDs for Powered Lines
19" Rack Mount