CANOGA PERKINS 9140 Four-Port SNMP Managed Fast Ethernet Switch - Manual (Page 40)

3-14
Figure 3-14 . Typical DC Power Supply Connections.
The polarity of the source DC supply determines the appropriate connection to the 9135/9140 2/Four-Port
Switch DC terminals.
If a -48VDC supply is indicated, the strap is connected from the Chassis Ground to the +VDC terminal.
Then the positive (+), or Common lead from the source DC supply, and the negative (-) lead from the
source DC supply are connected to like terminals on the 9135 Two-Port Switch or the 9140 Four-Port
Switch power entry barrier strip.
If a +48VDC supply is indicated, the strap is connected from the Chassis Ground to the -VDC terminal.
Then the positive (+) lead from the source DC supply and the negative (-) or Common lead from the source
DC supply are connected to like terminals on the 9135 Two-Port Switch or the 9140 Four-Port Switch
power entry barrier strip as above.
If the connections are reversed with opposites connected, damage may result to both the source DC and DC
converter module in the 9135 Two-Port Switch or the 9140 Four-Port Switch.
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