Digitus DN-82121-1 Service Manual

Gigabit Fiber Ethernet Converter

10/100/1000Base-T/TX to 1000Base-SX/LX

User’s Manual

Overview

Gigabit fiber media converter is a 10/100/1000 auto negotiating media converter. The copper port

auto negotiates the connected device’s speed and duplex mode: 10/100/1000Mbps half duplex;

or 10/100/1000 Mbps full duplex; the fiber port always operates at 1000Mbps. The maximum

distance is Multi-mode 0.5 or 2km and single-mode 10/20/40/60km or 80km.

Installation

1. Interface

RJ-45 interface

The transmission media adopts CAT5 twisted-pair with typical length of 100 meter.

It features the function of automatically identifying the through line and cross wire

Fiber interface

Fiber interface is of duplex mode type, including two interfaces, namely TX and RX. When the

two sets of optical transceiver are interfaced or connected to switch with fiber interface, the

fiber is in cross connection, namely "TX-RX", "RX-TX" (direct butting for single optical fiber).

2. Connection

The network device (work station, hub or switch) with RJ-45 interface is connected to RJ-45

jack of the media converter through twisted-pair. The fiber device is connected to fiber

interface of the media converter. Then switch on. The corresponding LED is on for correct

connection. (See the table below for the LED indicator lamp)

Table 1 : Front panel for single fiber media converter

Table 2 : Front panel for dual fiber media converter

Explanation for LED indicator

LED indicator serve as device monitoring and trouble display.

The following is the explanation for each LED indicator lamp.

LED Function Status Describing

PWR Power LED

FX

FX-LINK/ACT

1000M UTP port speed LED

TX-LINK/ACT

FDX/COL UTP port duplex LED

Fiber port signal
detect LED

Fiber port link/action
status LED

UTP port link/action
status LED

ON Power is ON.

OFF Power is Fail.

ON Laser is receiving.

OFF No laser input.

ON Fiber link is ok.

Blink

OFF Fiber link is fail.

ON 1000M speed

OFF 100M speed

ON Link is ok.

Blink

OFF Fiber link is fail.

ON Full duplex

OFF Half Duplex

Data is been received
or transmitted.

Data is been received
or transmitted.