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STRATA DK
GENERAL DESCRIPTION
DECEMBER 1990
number of electronic telephones by two;
each HDCB takes one port, and reduces
*-the maximum by one.
l Connections from the PEKU to the MDF
are made with 25-pair amphenol connec-
tors. Each port normally uses 2-pair wiring;
3-pair wiring is required when off-hook call
announce is supported.
l A maximum of three PEKUs can normally
be installed in DK24 to provide twenty-four
electronic telephone ports, seven in DK56
to provide fifty-six electronic telephone
ports, and twelve in DK96 to provide nine-
ty-six electronic telephone ports (see Table
4
NOTE:
The system capacities above apply only
when connecting 6500-series telephones to
PEKU PCBs. If earlier series Toshiba elec-
tronic telephones are used, the capacities
are reduced (see Table K).
Off-hook Call Announce Upgrade Unit
(EOCU): An optional off-hook call announce
upgrade unit mounts on top of the PEKU or
PESU piggy-back style. It is required on every
PEKU or PESU that supports stations receiv-
ing off-hook call announce. The unit provides
two off-hook call announce channels, which
are shared by all electronic telephone circuits
on a PEKU or PESU. An EOCU is not required
on PDKUs supporting stations with off-hook
call announce (see Table L).
Standard Telephone Interface Unit (PSTU):
The PSTU provides an interface between
standard telephones and the system. It adds
eight standard telephone ports, and has a 20
Hz square-wave ring generator.
l In addition, the PSTU provides support for
numerous Toshiba-supplied and customer-
supplied peripherals. Toshiba peripherals
include:
l Digital Voice Messaging Systems: One
standard telephone port is required for
each voice mail port.
l Power Failure Transfer Unit: The
PSTU
provides a -24VDC output for controlling
a power failure’;fransfer unit.(DPFT).
Customer-supplied peripherals include
those listed below:
l Auto attendant device
l Dictation equipment
l Facsimile
l Off-premises station
l Modem
l Standard telephone
l Voice mail device
A maximum of three PSTUs can normally
be installed in DK24, providing twenty-four
standard telephone ports; seven PSTUs
can normally be installed in DK56, provid-
ing fifty-six standard telephone ports; and
twelve in DK96, providing ninety-six stan-
dard telephone ports (see Table K).
Connections from the PSTU to the MDF
are made with 25pair amphenol connec-
tors, one pair per port.
If any devices which send DTMF signals
are connected to the PSTU, a CRCU must
be installed on the PCTU2, PCTU3, or
PCTUS.
Standard/Electronic Telephone Interface Unit
(PESU): The PESU PCB provides an inter-
face with a combination of two standard tele-
phone and four electronic telephone circuits.
The two standard circuits are identical to
PSTU circuits, providing an interface with
standard telephones and/or peripheral
devices. The four electronic telephone circuits
are identical to the PEKU circuits; they provide
interface to Toshiba electronic telephones
(with/without off-hook call announce), BGM
source connection, and an HDCB, but do not
support a DSS console.
l The PESU can accept an EOCU sub-
assembly PCB to support electronic tele-
phones that receive off-hook call
announce.
l If any devices that are connected to the
PESU standard telephone ports send
DTMF signals, a CRCU must be installed
on the PCTU PCB.
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