Door Phones; Off-Hook Call Announce - Toshiba Strata DK24 Installation And Maintenance Manual

INSTALLATION-CONFIGURATION
SECTION 400-096-204
SEPTEMBER 1992
this configuration, which can be supported
by the DK24.
Example 7—Two tenants in one building require,
on a combined basis, 13 CO lines, 23 digital
telephones, eight standard DTMF telephones, a
fax machine, four DDSS consoles, Remote Main-
tenance, and an interface to their alarm system.
•
The 13 CO lines can be supported by four
PCOU PCBs, since each PCOU has four CO
line circuits. The 23 digital telephones and
the four DDSS consoles require 27 digital
telephone circuits, which can be accommo-
dated with four PDKU PCBs. The fax ma-
chine and the eight DTMF standard tele-
phones can be handled with one PSTU and
one PESU. Because DTMF is coming into
the system, a CRCU must be installed, but
does not deduct from the available universal
slots. The PIOUS PCB can be equipped with
an IMDU to provide Remote Maintenance. In
addition, the PIOUS has an interface for the
alarm system. The total PCB requirement (in
addition to common equipment) is as fol-
lows:
Four PCOU PCBs
Four PDKU PCBs
One PSTU PCB
One PESU PCB
One CRCU subassembly
One PIOUS PCB
One IMDU subassembly
•
A total of 11 universal slots are required; so
a STRATA DK96 can meet the requirements
of the configuration.

2.30 Door Phones

2.31 Up to 12 door phones (MDFB) can be accom-
modated by either a DK24, DK56, or a DK96
equipped with a PCTU (1, 2, 3, or 4). DK24s
equipped with a PCTUS can support only nine door
phones. A Door Phone/Lock Control Unit (DDCB or
HDCB) is required for every three door phones.
Each DDCB/HDCB interfaces to a STRATA DK
system via Ports 04, 12, 20, and 28. Available with
PCTU4 only, the DDCB connects to digital circuits
associated with Ports 04, 12, 20, and 28; and the
HDCB, which can be supported by the PCTUS as
well as all versions of the PCTU, connects to
electronic circuits associated with four ports. For
system configuration, each DDCB and HDCB must
be considered equivalent to a telephone as far as
consuming station capacity. Table 4-E provides
more details regarding DDCB and HDCB configu-
ration.
2.40 E & M TIE Lines
2.41 Each PEMU PCB provides interface to four
TIE lines. Up to four TIE lines can be accommo-
dated by DK24, up to eight by DK56, and up to
twelve by DK96. TIE lines (PEMU) are the same as
CO lines (PCOU), when considering the maximum
total outside lines in a system. The maximum lines
per system are 16 for DK24, 24 for DK56, and 36 for
DK96. In addition, each PEMU uses up station
ports so that the software-limited station capacity of
a system is reduced with every PEMU added. The
number of station ports consumed by the PEMU
depends on the type of PCTU used. If a PCTU (1,
2, 3, or 4) is installed, the PEMU reduces the
system station capacity by four. If a PCTUS is
installed, each PEMU reduces the station capacity
by eight. This is of concern only in a DK24 system
that requires more than 16 stations. Each PEMU
added to a system uses up one universal slot.
NOTES:
1. DK24's limit of four TIE lines (one PEMU)
is due to power supply capacity. Do not
exceed this limit.
2. Systems that support TIE lines must be
equipped with a CRCU.
2.50 Off-hook Call Announce (OCA)
2.51 Digital and electronic telephones equipped
with an OCA subassembly can receive OCA calls.
PEKU PCBs supporting electronic telephones
equipped for OCA must also be upgraded with an
EOCU subassembly. PDKU PCBs supporting digi-
tal telephones equipped for OCA require no such
upgrade. Telephones making OCA calls do not
require an upgrade.
•
The OCA upgrade for the digital telephone is the
DVSU, which installs inside the base of the tele-
phone.
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