Mitel 300 Installation And Maintenance Manual page 21

Hybrid pabx/key-system
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To Locate the Digital Line Module (ISDN) in the Expansion Module
Remove the Expansion Module by firstly opening the Expansion Module cover
Open the Expansion Module and remove it from the MDF
Insert the Digital Line Module (or modules) on the MDF connectors
The upper slot is the first module position
The top connector is for the first module that connects to the Network only.
The lower connector is for the second module. This can be an ISDN Network connection or
an internal ISDN S-bus connection
Mitel 3000 Australia Installation and Maintenance Manual
Second Module. Can be
external T or internal S
20
First network
module

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