
Hardwareoptions Page51 of 174
M3900Series Meridian Digital Telephones Description,Installation and Administration
Expansion ModulesDisplay-based Expansion Module
TheDisplay-based Expansion Module (DBA) provides additional
Line/ProgrammableFeature Keys (Self-labeled) for the M3904 and M3905.
TheDBA supports up to threelayers of eight additio nal keys for a total of 24
keys.
Note: Referto Table 7on page 47 for a list of the telephones with which
theDisplay-based Expansion module is compatible.
A Pagefixed key located on the DBA allows a user to switch between the
threelayers of Self-labeled Programmable Feature Keys. Visual indication is
alsoprovided to indicate which page (or layer) of Self-labeledProgrammable
FeatureKeys is in use. Feature activation and deactivation on the DBA Keys
isthe same as the Programmable Feature Keys on the M3904 and M3905.
Theuser may change the feature key labels by selecting “Change feature key
label”from the Options List on the M3904 or M3905.
TheDisplay-based Expansion Module is only supported on the M3904 and
M3905.You can attach a maximum of one Display-based Expansion Module
to an M3904 or M3905 set.
Key-based Expansion Module
TheKey-based Expansion Module (KBA) attaches to the M3904 and M3905
MeridianDigital Teleph ones. The KBA provides 22 additional Line/Feature
Keys.You can att ach a maximum of two Key-based Expansion Modules to
theM3904 and M3905.
External Alerter and Recording InterfaceTheExternal Alerter and Recording Interface provides an interface for a
remoter inger device installed in a location separate from the telephone. The
ExternalAlerter and Recording Interface provides access to a standard,
off-the-shelfremote ringer, call status relay, audio recorder or visual
indicator.
Youcan program the External Alerter interface to activate a ringer (or light)
whenthe telephone rings or when the telephone is in use (off hook).