Instruction manual

System Features
Emergency Ringdown
Strata DK General Description 6/00 75
Emergency Ringdown
Standard telephones can be programmed to automatically ring a designated extension when they
are taken off hook, after a predetermined time without dialing. The receiving digital or electronic
LCD station or attendant console displays the station name/number of the off-hook calling station.
This feature does not work with digital and electronic telephones.
In healthcare applications, this feature is known as Emergency Ringdown operation. It is used to
assist callers who may not be able to complete a call by dialing. If a station is left off-hook,
continuous ringing will occur at a designated extension. This feature is also known as “Hotline
Service” for hotel/motel applications. See “Hotline Service” on Page 78 for more information.
Enhanced 911 (E911) Service (DK40i, DK424i only)
E911 delivers a 911 call to the Public Safety Answering Position (PSAP) with an information
element that identifies the source of the call. Called CESID (Caller Emergency Services
Identifier), it can be used to determine the location of the caller. In many locations, E911 also
includes the ability to connect to emergency services by dialing “9-1-1” without any access codes.
The Strata DK offers three E911 solutions. Only one solution may operate on a system at one time.
Detailed installation instructions for each solution may be found in the Strata DK Installation &
Maintenance Manual. The solutions are:
♦ Adjunct Equipment – The Strata DK uses standard, single-line telephone ports to connect to
external E911 equipment which is connected to the public network by CAMA trunks.
♦ CAMA Trunks – The DK424i can connect directly to CAMA trunks using an RMCU PCB
and its RMCS subassembly. Internal notification includes alerting of attendant consoles,
optional conferencing of the emergency call and a Start-of-Call SMDR message. The system
may be programmed to sustain the CAMA connection even if the originating station goes on
hook. With this option, if the station goes off hook again, it will continue to be connected to
the PSAP.
♦ ISDN – The DK40i and the DK424i can deliver E911 calls to the PSTN over PRI. The
following table shows the availability of these solutions on the Strata DK models. Internal
notification includes alerting of attendant consoles, optional conferencing of the emergency
call and a Start-of-Call SMDR message. ISDN trunks will not sustain a connection after the
originating party hangs up.
Adjunct Equipment Operation
The Strata DK provides two single-line telephone ports (QSTU2, RSTU, KSTU2, RDSU, PSTU,
or PESU) to connect to adjunct E911 equipment. These specially programmed, single-line ports
communicate the originating DN to the adjunct equipment using DTMF tones.
The adjunct equipment uses CAMA (Centralized Automatic Message Accounting) trunks to
connect the call to the public network. CAMA trunks are analog trunks that use reverse-battery
signalling and MF (Multi-Frequency) tones to dial 911 calls and transmit the CESID.
Table 35 E911 Solution by Software Release
E911 Solution DK40 DK40i DK424i
Adjunct Equipment Release 3.1 Release 3.1 Release 3.1
CAMA Trunks Release 4.3 Release 4.3
ISDN Release 4.3 Release 4.3