Zhone 4929 DSLAM User Manual

4929-A2-ZN20-30

 4929 DSLAM Installation and User’s Guide

31

To connect a modem to the COM port:

1 Determine and procure the proper DCE cable type for your modem. The 

COM port requires an RJ45-type plug connector. The other connector 

depends on the serial port on your modem. The connection requires an 

EIA-232E crossover (null modem) cable or adapter. See 

 in 

2 Connect the modular plug connector of your cable to the COM port 

socket.

3 Connect the other end of the cable or adapter to the serial port of your 

modem.

The 4900 Series DSLAM is powered by a nominal –48 VDC source. Dual 
power feeds are provided for redundancy. The terminal block accepts 18 to 14 
AWG wire. 

The DC power terminal block on the DSLAM has five terminals: two 
positive, two negative, and one ground. Only one positive terminal and one 
negative terminal pair need be connected for operational purposes. The 
second positive and negative terminal pair may be connected to a backup DC 
power supply for redundancy. The ground terminal must be connected 
regardlessly. DO NOT OPERATE THE DSLAM WITHOUT A GROUND 
CONNECTION.

To connect the DSLAM to power:

1 Make sure that the DC power source wires are not powered (that is, the 

circuit breakers or fuses are open at the source).

2 Strip about 1/2 inch (13 mm) of insulation off the ends of the 18–14 AWG 

or 0.75–2.5 mm

2

 solid or stranded wires you will use for power. 

3 Loosen the screw above the center terminal on the DC terminal strip on 

the face of your DSLAM.

4 Insert your ground wire into the center terminal and tighten the screw.

5 Attach the other end of the ground wire to an earth ground.

6 Loosen the screws above the positive and negative terminals on one side 

of the terminal strip.

7 Insert your negative DC power lead into the negative (–) terminal and 

then tighten the screw.

8 Insert your positive DC power lead into the positive (+) terminal and then 

tighten the screw.

 through 

 if you have a redundant power source.