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Introduction
M3900 series telephone.Once the ACM is installed, the MCA cartridge accessory
is inserted into the ACM to provide an interface to data functions. To install the
ACM refer to the Accessory Connection Module Installation Guide packaged with
the ACM.
Use the following procedures to install the MCA to the telephone:
• Plug the MCA Accessory Cartridge into the ACM opening in the back of the
telephone footstand.
• Plug the MCA transformer into the appropriate external electrical outlet (use
only the transformer designed for your MCA).
• Connect the Adapter plug, attached to your transformer, into the wall jack.
• Connect the six conductor line cord from the telephone to the Adapter jack
attached to your ATA transformer.
• Connect the MCA to the your data equipment.
For countries outside Canada, Japan and the US, separate purchase of a power
supply cordset is necessary. Care should be taken to match the plugs on the
cordset to the wall receptacle and the power supply. Be certain to select a safety
certified cordset, compliant with local, regional and national installation codes.

Use the MCA to make data calls

Before you use the MCA to make data calls, do the following:
• Make sure the red LED on the MCA is blinking at a constant rate. This indicates
the MCA has power and is ready for operation.
• Attach your terminal or PC serial port to the MCA 25 pin D conn ector via an
RS-232 or V.35 cable.
• Make sure that your terminal or PC is powered up and ready to send data.
• If you are using a PC, make sure your communication software is running.
CAUTION
Before handling internal telephone components, you must
discharge static electricity from your hands and tools by touching
any grounded metal surface or conductor.
CAUTION
Use only the line cord provided with your Meridian M3900
Telephone when installing and removing options.