User Manual

Table Of Contents

OPTICAL MASTER UNIT

PRODUCT DESCRIPTION AND USER’S MANUAL

Label Unit Description Allocated Slots

6. Rack communication

board

Provides communications link

between the Control Module and the

Fiber Optic Converters.

Also used when cascading OMUs.

7. Power Supply modules

(A and B)

PS B is optional for redundancy 13

8. Modem Antenna

connections

This module is optional. This is used

for OMUs with wireless modems

installed that need a separate antenna.

This module c

an also be equipped

with two connectors.

1.4.1 WDM Fiber Optic Converter

Caution!!!

Un-terminated optical receptacles may emit laser radiation.

Do not stare into beam or view with optical instruments.

These modules perform the following functions:

• Provides RF to optical signal conversion in both

directions.

• Downlink and uplink optical signals are combined

using WDM – only one fibre is required.

• Each WDM Fiber Optic Converter in the OMU works

in parallel with a corresponding unit in the repeater

which is linked via the fibre (SC/APC port).

• A pilot tone can be sent between the Fiber Optic

Converters in the OMU and the repeater to define the

loss in the fibre. Based on this information the

repeater automatically adjusts the attenuation to

compensate for the fibre loss.

• On the Fiber Optic Converter module there are six

LED indicators; one for power status, one for error,

two for the data communication and two for the RF

signals.

ERR

PWR

DATA

OPTO

SC/APC