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Step 2: Connect POTS (PHONE)

If POTS cables are not available, use 

Figure 3

 and the following 

procedure to create the POTS cables:

1. Trim the insulation for the subscriber POTS cables.
2. Refer to the 

Figure 3

 and connect the twisted-pair Tip (green) 

and Ring (Red) to the RJ-11 connector using an RJ-11 crimper.

3. Insert the RJ-11 connector in the appropriate PHONE 1 or 

PHONE 2 jack.

Figure 3. POTS (PHONE) Connection

Step 3: Connect Ethernet 

The 424RG3 ONT supports four 1 Gigabit (10/100/1000Base-T) 
connections (GE 1 to GE 4). 
If Ethernet cables are not available, use the following procedure and 
table to create the Ethernet cables:

NOTE

The Ethernet cables should be CAT 6 rated.

1. Trim the insulation for the subscriber Ethernet cable.
2. Connect the wires per the following table using an RJ-45 

Crimper.

3. Insert the CAT 6 rated cable in the appropriate GE 1 through GE 

4 ports on the rear of the 424RG3 ONT.

Step 4: Connect Power

Plug the supplied 12 VDC Power Adapter into the 

12V

 connection on 

the rear of the chassis. Connect the AC plug to a standard 120 or 230 
VAC outlet.

Ethernet RJ-45 Pin-out

Pin

Name

Description

Color Code

1

TRD0+

Transmit/Receive Positive

White/
Orange

2

TRD0-

Transmit/Receive Negative

Orange

3

TRD1+

Transmit/Receive Positive

White/Green

4

TRD2+

Transmit/Receive Positive

Blue

5

TRD2-

Transmit/Receive Negative

White/Blue

6

TRD1-

Transmit/Receive Negative

Green

7

TRD3+

Transmit/Receive Positive

White/Brown

8

TRD3-

Transmit/Receive Negative

Brown

1 2 3 4

1 = Not Connected
2 = Tip
3 = Ring
4 = Not connected

Step 5: Connect UPS (optional)

NOTICE

DO NOT connect the Power Adapter and an UPS at the same time as
this will cause damage to the 424RG3 ONT. The ONT can be powered
by either power source, but not both simultaneously.

The 424RG3 ONT can typically use an un-interruptible power supply 
(UPS) if desired. Power is supplied to the 424RG3 ONT by a local 
power source with battery backup that utilizes the AC power at the 
customer premises. The UPS powers the 424RG3 ONT and functions 
as a battery backup unit (BBU) supplying continuous 12 VDC. Refer 
to the installation material that is provided with the UPS when 
installing the BBU.

UPS Connector

Connect the UPS to the 8-pin MOLEX connector labeled “UPS” 
located on the rear of the SFU ONT chassis. 

Figure 4

 illustrates the 

MOLEX connector on the rear of the ONT.

Figure 4. 8-Pin Molex Connector

The UPS Power/Alarm Connections Table below defines each pin on 
the connector. 

NOTE

ADTRAN offers a UPS Cable assembly (P/N 1287402G1) for this
connector.

UPS Power/Alarm Table

The following table indicates which pin is associated with each alarm 
provided through a UPS connection.

NOTE

If an UPS is being used and is disconnected, the 424RG3 ONT is not
protected from power outages, and will send a “Battery Missing”
alarm to the OLT.

Pin-Out

Description

Alarm

1

Power Input (+12 VDC)

-

2

UPS  Status  -  On  Battery

1

3

UPS Status - Battery Missing

2

4

Signal Return

5

Power  12  V  Return

-

6

UPS Status - Replace Battery

3

7

UPS Status - Low Battery

4

8

No Connection 

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