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INSTALLATION-CONFIGURATION
SECTION 200-096-204
FEBRUARY1991
tronic telephones with OCA must also be upgraded
with an EOCU subassembly. However, PDKU PCBs
supporting digital telephones with OCA require no
such upgrade. Telephones calling to an OCA-
equipped digital or electronic telephone do not
require an upgrade.
l
To receive OCA calls, a digital telephone must be
upgraded with asubassembly called DVSU. Each
digital telephone can be so equipped.
l
To receive OCA calls, an electronic telephone
must be upgraded with two subassemblies, HVSU
and HVSI. Each electronic telephone can be so
equipped; there is no limit. Also, each PEKU or
PESU PCB supporting telephones equipped for
OCA must be upgraded with an EOCU. This means
that every electronic telephone which must re-
ceive an OCA call must be connected to a PEKU
or PESU equipped with the EOCU subassembly.
Therefore, OCA-equipped electronic telephones
should be kept in groups of four in concert with a
particular PESU and in groups of eight with a
particular PEKU. Since the EOCU is a subassem-
bly on the PEKU or PESU, it does not reduce the
number of available universal slots.
l
All system slots, except DK96’s 11-l 4and DK24’s
05 and 06 with PCTUSl , support telephone OCA
receiving.
2.60 Data and Modems with Release 1 or 2
2.61
Passing data at up to 9600 bits per second
through the STRATA DK standard telephone ports
is possible. To accomplish this function, an exter-
nal, commercially available modem is required.
Most typically, the modem will be housed in a
personal computer and have its own two-wire
modular connection. It is interfaced to STRATA DK
via a PSTU or PESU PCB as if it were a standard
telephone. The IMDU modem discussed previ-
ously in Example 6 can only be used with the PIOU
or PIOUS PCB for remote maintenance.
IMPORTANT NOTE:
For data applications requiring more func-
tions than that provided by a personal
computer and modem, it is recommended
to use the STRATA DK data interface units,
PDIU-DI and PDIU-DS. This includes data
applications such as modem pooling,
printer sharing, PC-to-PC file transfer, etc.
Example
8-A sizable business needs 15 CO lines,
three E&M TIE lines, 37 electronic telephones,
two DSS consoles, four door phones, three
standard telephones, a FAX machine, three
modems, off-hookcall announceforseven of the
37 electronic telephones, and three-zone pag-
ing. The customer also wishes to use the Direct
Inward System Access (DISA) feature.
l
The four door phones require two HDCBs
since each HDCB has a maximum of three
door phones. Each HDCB interfaces as an
equivalent electronic telephone. The two DSS
consoles count as the equivalent of four
electronic telephones, in addition to the two
for the HDCBs and the 37 actual electronic
telephones, resulting in 43 equivalent elec-
tronic telephones. The system, therefore,
requires six PEKU PCBs. One of the PEKUs
needs an EOCU PCB to accommodate the
seven electronic telephones that will have
off-hookcall announce. This particular PEKU
should be one that does not interface a DSS
console, because the DSS console inter-
faces as the equivalent of two electronic
telephones, so only six electronic telephones
could have the OCA feature. These seven
electronic telephones should, therefore, have
certain station numbers in order to save the
extra expense of additional EOCU PCBs.
l
The equivalent of seven standard telephones
need to be interfaced, so only one PSTU is
required. A CRCU PCB will be required for
the DISA feature, since DTMF tones will be
coming into the KSU. Therefore, the stan-
dard telephones and like devices can use
DTMF without any additional cost. If only one
zone of external paging is needed, a PEPU
or PIOUS PCB could do the job. But three
zones are required, so a PIOU PCB will be
installed. For 15 CO lines, four PCOU PCBs
are needed. Only one PEMU PCB is required
for the three TIE lines. The PEMU uses up
four stations from the total station capacity,
but no extra hardware is required because of
this, and this system is very far from using the
maximum station capacity so it is not of
concern here.
l
In summary, the total PCB requirement (in
addition to common equipment) is as fol-
lows:
4-6