Page 26 of 104 M2000 Series Meridian Digital Telephones553-3001-108 Standard 9.00 April 2000Program keyThe Program key is automatically assigned to M2000 Series Meridian DigitalTelephones with Display, Meridian Communications Adapter (MCA), orMeridian Programmable Data Adapter (MPDA) added. You can change avariety of display features such as screen format, contrast, and language. Italso lets you change data parameters, such as transmission speed and parity,on the MPDA and MCA (if equipped).The upper right-hand key (key 05 on the M2006 and key 07 on all others)automatically becomes the Program key when Display, MCA, or MPDA isconfigured with the telephone. The Program key is local to the telephone andshows blank when you print key assignments in LD 20.See “Data options” on page 85 for descriptions of the MCA, MPDA and ATAand their requirements.External Alerter interfaceThe External Alerter Board provides an interface to standard remote ringingdevices, such as a ringing unit installed in a location separate from thetelephone. The External Alerter interface is not the remote ringer itself, butprovides access to standard, off-the-shelf remote ringing devices. The AlerterBoard requires additional power. See “Power requirements” on page 32.You can program the External Alerter interface to activate a ringer (or light)when the telephone rings or when the telephone is in use (off-hook).For information on installing and setting up the External Alerter, see “Add-onmodules” in Telephone and Attendant Console: Installation (553-3001-215).Key Expansion ModuleA modular 22-key unit can be attached to any 16-key M2000 Series MeridianDigital Telephone except M2016S. See Figure 6. The extra keys can beassigned to any combination of lines and features. You can add up to twoexpansion modules to 16-key telephones, providing a total of 60 line/featurekeys. You will need a separate footstand for the module(s), one for a singlemodule, one for a double. See “Ordering information” on page 39. Theexpansion module may require additional power. See “Power requirements”on page 32.