7
Powering Up the Network Extender
The DC power terminal block on the network extender has five terminals: two positive,
two negative, and one with no connection (NC). Only one positive terminal and one
negative terminal pair need to be connected for operational purposes. The second
positive and negative terminal pair may be connected to a backup DC power supply for
redundancy purposes. There is also a system ground terminal on the back panel above
the power connector. Connect this terminal to a reliable source of ground. The ground
terminal must always be connected regardless of the powering connections. DO NOT
OPERATE THE NETWORK EXTENDER WITHOUT A GROUND CONNECTION.
Procedure
Power Connection - Grounding
1. Connect a copper wire of at least 18 AWG from a ground source to the ground
lug on the back of the unit. In Telco central office installations, the ground source
must be a Common Bonding Network (CB-N).
2. The ampacity of the ground conductor shall be equal to, or greater than, the
ampacity of the conductor connected to the DC power connection’s DC return.
3. Strip the end of the ground wire. The bare stripped ends of the ground conductor
must be coated with an anti oxidation compound before crimp connections are
made to connector terminals. Crimp a connector (of a size suitable to fit the
ground lug on the chassis) onto the prepared wire end. Use only listed
connection terminals on the ground wire.
4. The ground lug on the unit has two nuts with a star washer between them.
Remove the outer nut and star washer, put the ground connector (prepared in
step 3 above) over the ground stud on the chassis. Replace the star washer on
the stud, then the nut. Tighten the nut so that the ground connection is secure
and will not rotate.
Power Connection – DC Power
1. Loosen all screws at the top of the power terminal strip.
2. Insert your –48 VDC lead into the negative (–) terminal of one of the terminal
pairs. Tighten the screw for that terminal.
3. Insert your 48 VDC return lead into the positive (+) terminal of the same terminal
pair as in Step 2. Tighten the screw for that terminal.
4. Repeat Step 2 and Step 3 for the free pair of power terminals if you have a
redundant power supply.
5. Plug the power terminal strip into the power connector on the back of the unit.
6. Verify that the Power LED on the front of the network extender is illuminated.
