Nortel Phone System

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NORSTAR MODULAR 8X24 DR5.1 SOFTWARE

The feature cartridge contains the system software for the Modular 8X24 operation, including the call processing, administration, and maintenance features and functions.
Post DR2 feature cartridges come in two parts for faster, easier and less expensive upgrades:

• The Read Only Memory (ROM) section houses system software and is easily replaced when upgrading.
• The Random Access Memory (RAM) section stores customer data (features and functions you have access to) and remains unchanged in case if upgrading software.