NEC TOPAZ - What is the 2 PGDU Card?

What is the 2PGDU Card?
What is the 2PGDU Card?
The 2PGDU card provides:
• 2 connections for NEC Infrontia door phones.
Each connected via a separate RJ11 plug.
• 2 audio ports that can be configured for either external paging, external music input or background music.
Each connected via a separate 3.5mm jack plug.
• 2 Relay contacts. These can be assigned to any of the door phones or audio ports of the 2PGDU card.
Both relay contacts are connected via a single RJ11 plug.
You can install one 2PGDU card into each of the Topaz main or expansion units giving a total of three cards.
Audio ports Door phones Relays
2 1 2 1 1&2
Topaz 2PGDU Guide 3