Canoga-perkins 9140 Four-Port SNMP Managed Fast Ethernet Switch Manuale Utente Scaricare il pdf (Pagina 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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Canoga-perkins 9140 Four-Port SNMP Managed Fast Ethernet Switch Manuale Utente Pagina 40