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- Mnfr. Part #: GCDU2A
- Adds an additional 3 CO lines, 3 Caller ID units, and 8 digital telephone circuits with a single PCB
- Attaches to the GMAU2 motherboard
- With the GCDU2 installed, the CIX40 supports up to 16 digital telephones (DKTs), 6 CO lines and 6 Caller ID circuits
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