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INSTALLATION-PCB
SECTION 200-096-206
FEBRUARY 1991
outward. If the connectors are properly mated,
a slight resistance will be felt.
NOTES:
1. Do not adjust trimmer capacitor C4. The
capacitor is factory-calibrated.
2. When transporting the PCTU, keep the P7
battery strap in the ON position if it is de-
sired to save the configuration data stored
in PCTU RAM (the battery will protect
RAM for approximately six years); other-
wise, to conserve the lithium battery, move
P7 to the OFF position. When packaging
the PCTU, use only a non-conductive
material enclosure, such as plain paper.
Conductive material can cause the inter-
nal battery to discharge and erase mem-
ory in the PCB.
3.30 PCTU Wiring
3.31
Refer to MOH/BGM Wiring Diagram, Section
200-096-208, for PCTU wiring/interconnecting de-
tails.
3.40 PCTU Programming Overview
3.41
After initially installing a new and unused
PCTU, all on-board RAM memory needs to be
erased by running
Programs
90 and 92. If RAM
contains configuration or feature data from previ-
ous programming that should be retained, either do
not run these programs or use them selectively.
See the Programming Procedures, Section 200-
096-300.
3.42 The following parameters may be specified,
through programming, for the PCTU:
Program 03
l
Specify code 91 to indicate a normal PCTU.
l
Specify code 92 or 93 to indicate a PCTU with
DTMF Receiver Unit (CRCU-4 or CRCU-8, re-
spectively) option installed.
NOTE:
Codes 9 1,92, and 93 apply to both the PCTU
and PCTUSl.
Program 12
l
Select the seize time of the CRCU circuit.
4 ELECTRONIC TELEPHONE INTERFACE
UNIT (PEKU) .
4.00 General
4.01 The Electronic Telephone Interface Unit
(PEKU) provides eight ports for electronic tele-
phones. Depending on system configuration, DK24
can support up to four PEKUs with PCTU (1 or 2)
and three PEKUs with PCTUSI ; DK56 can support
up to eight PEKU PCBs, and DK96 up to twelve
PEKU PCBs.
4.02 The number of electronic telephones that can
be connected to PEKU PCBs in a system depends
on the series of telephones used. This is due to
power capacity. It is recommended that the current
6500-series be used, because this series con-
sumes the least amount of power. The maximum
number of 6500-series electronic telephones al-
lowed in DK24 is 32, in DK56 is 64, and in DK96 is
96. If using an electronic telephone series other
than, or mixed with, the 6500-series, see the con-
figuration chapter, Section 200-096-204, work-
sheet 7.
4.03 The PEKU can be configured for Off-hook
Call Announce (to receive OCA calls) by installing
an Off-hook Call Announce Unit (EOCU). It can
also be configured to support a DSS console, a
Door Phone/Lock Control Box (HDCB), and an
external Background Music (BGM) source connec-
tor. DSS consoles, HDCBs, and the BGM source,
are wired directly to the PEKU and require no
additional hardware, but do require specific ports/
circuits.
4.04 PEKU controls and interface connectors are
shown in Figure 6-4 and described in Table 6-B.
4.10 PEKU Hardware Options
4.11
The PEKU supports the following hardware
options:
Internal Options
l
Off-hook Call Announce Unit (EOCU)
External Options
I
l
DSS console
l
Door Phone/Lock
l
BGM source connection
6-6