Zyxel OLT2412 [28/326] Dc power wire specifications

Chapter 1 System Introduction

OLT2412 User’s Guide

module or fan RPMs, temperature, or voltage values outside of the accepted threshold triggers a

critical alarm and turns on the management card’s Alarm LED.

The OLT automatically adjusts the rotation speed of the fans based on the detected temperature.

You can also manually set the high and low fan speed limits for raising an alarm on a specific fan.

The following table covers how the OLT automatically adjusts the rotation speed of the fans based

on the detected temperature. See Section 5.6 on page 55 for how to display the fan speed. See

Section 46.1 on page 315 for fan module specifications.

1.9 Cables

This section describes the appearance, specifications, and pin assignment of the cables you use

with the OLT.

1.9.1 DC Power Wires

The DC power wires transmit DC power to the power module. Use two wires of the gauge specified

in Table 14 on page 28 connect each DC input to a DC power supply to supply the operating voltage

for the OLT. The connections are as follows:

• One end of the power wires connects to the input on the DC input of the power module.

• The other end of the power wires connect to the output port of the DC power supply.

Note: The black power wire is the -48 V return ground wire connected to the ground

terminal of the DC input on the PSU Dual. The blue power wire is the -48 V power

wire connected to the -48 V terminal of the DC power board.

1.9.1.1 DC Power Wire Specifications

The following table lists the specifications of the DC power wire.

1.9.2 Fiber Optic Cables

Fiber optic cables connect:

Table 14 DC Power Wire Specifications

ITEM DESCRIPTION

Function Electrical cable

Wire Gauge AWG (American Wire Gauge) is a measurement system for wire that

specifies its thickness. As the thickness of the wire increases, the

AWG number decreases.

Make sure you use wires of the specified wire gauge.

Ground wire: 12-18 AWG or larger

Color Blue (-48 V power cable), black (-48 V return ground cable)

Connectors None, use bare wire

DC resistance of the inner conductor 4.95 ohm/km

Cross-sectional area of the conductor 4 mm2