Toshiba Strata DK24 Installation And Maintenance Manual page 78

INSTALLATION-CONFIGURATION
SECTION 400-096-204
SEPTEMBER 1992
used in any of the universal slots. (DK24 has six
universal slots, DK56 has eight, and DK96 has 14.)
Table 4-C shows all the PCBs which can be in-
stalled in universal slots and the maximum quantity
of each PCB allowed per system. It may be helpful
to consider the following configuration examples:
Example 1—A small business requires a system to
handle six CO lines, 12 electronic telephones,
and three standard rotary-type telephones.
•
The PCB configuration (in addition to com-
mon equipment) is as follows:
Two PCOU PCBs
Two PEKU PCBs
One PSTU PCB
•
Each of these PCBs requires one universal
slot, so a total of five slots are required.
Therefore, a DK24 can be used.
Example 2—A bank branch office needs nine CO
lines, seven electronic telephones, five digital
telephones, and 11 standard rotary-type tele-
phones.
•
The PCB configuration (in addition to Re-
lease 3 or 4 common equipment) is as fol-
lows:
Three PCOU PCBs
One PEKU PCB
One PDKU PCB
Two PSTU PCBs
•
The configuration requires seven universal
slots; therefore, DK24 is ruled out, because
it has only six universal slots. Offering 14
universal slots, DK96 could be used, but it is
a little too big for the office's needs at the
moment. DK56, with its eight universal slots,
could meet those needs immediately and
could accommodate some minor expansion.
Example 3—A large travel agency needs 18 CO
lines, 14 electronic telephones, 14 digital tele-
phones, and two standard push-button dialing,
Dual Tone Multifrequency (DTMF) standard tele-
phones.
•
The PCB configuration (in addition to Re-
lease 3 or 4 common equipment) is as fol-
lows:
Five PCOU PCBs
Two PEKU PCBs
Two PDKU PCBs
One PESU PCB
One CRCU subassembly
•
Each of these PCBs, except for the CRCU,
requires one universal slot. Therefore, a total
of 10 slots are required. This is beyond the
capacity of DK24 and DK56 (six and eight
slots, respectively) but well within the capac-
ity of DK96. The CRCU, which mounts on the
PCTU, is required for the DTMF standard
telephones.
2 OPTIONS AND PERIPHERALS
2.00 Option Printed Circuit Boards
2.01 Numerous options, such as a paging ampli-
fier, External Page (one zone), relay control, etc.,
require an additional printed circuit board (PCB)
called the PEPU. If even more options are required,
such as Multi-zone Paging, an alarm sensor, Sta-
tion Message Detail Recording (SMDR) or Remote
Maintenance, then the PIOU or a PIOUS PCB will
be needed. Table 4-D provides more details about
the capabilities of these PCBs. Only one option
PCB is allowed per DK system. The maximum
station port capacity is reduced by eight and CO
line capacity by four with the installation of any of
these PCBs.
2.10 Direct Station Selection (DSS) Consoles
2.11 STRATA DK systems equipped with a PCTU1,
2, 3, or 4 can support up to four DSS consoles, and
systems operating with a PCTUS can support up to
three. There are two types of DSS consoles: the
DDSS console and the HDSS console. The DDSS
console and the HDSS console share the same
function and look essentially alike, but interface
with different types of circuits. Each DDSS console
can only be connected to circuit 8 of a Digital
Telephone Interface Unit (PDKU) PCB, while each
HDSS console can only be connected to circuits 7
and 8 of an Electronic Telephone Interface Unit
(PEKU) PCB—each console requires a separate
PCB. DDSS consoles are available only with PCTU3
and 4, but HDSS consoles are supported by each
of the PCTU versions as well as the PCTUS.
2.12 DSS consoles can be assigned flexibly so that
one to four DSS consoles can be assigned to one
4-4