Instruction manual

Strata DK40i
Functional Block Diagram
16 Strata DK General Description 6/00
Power Failure Interface
The Base KSU provides an interface for a dedicated backup standard telephone during an AC
input power failure. If the system AC input power fails, the backup telephone automatically
connects to the CO1 line. The backup telephone is disabled when the system operates during
normal power conditions.
This feature is independent of Battery Backup and is available when loop start lines are installed in
the Base KSU. A power failure telephone cannot be installed for DID lines.
Music-on-Hold Interface
Customers can connect their own MOH source to this interface. The source can also feed external
page speakers and telephone speakers with BGM.
♦ Paging Interface – This 600-ohm interface supports a Toshiba External Speaker (HESB) or a
customer-supplied amplifier and speaker for Paging, Night Ringing over Page, and BGM.
♦ Flexible Relay Contacts – A relay contact can be programmed to either mute BGM during a
page announcement over external speakers, to operate a device: i.e., an answering machine or
ringing bell during the Night Mode, or to provide on-off control for a MOH source.
Functional Block Diagram
Figure 8 shows the Strata DK40i Base and Expansion KSU PCBs and the available lines, stations
and peripherals. Basic voltage and cabling information is also included.