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INSTALLATION-SYSTEM DESCRIPTION
SECTION 200-096-202
FEBRUARY1991
TABLE2-B
COMMONCONTROLUNITDATA
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NOTES:
1. PCTU2 replaces PCTUl.
2. Except for the ROM version, PCTU2 and PCTUl are identical.
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3. PCTU (1, 2, or 3) ROM is not interchangeable with PCTUSl ROM.
4. All PCTU versions provide MOHIBGM input and volume control.
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5. PCTU3 ROM is not interchangeable with PCTUl or 2 ROM.
vices into data signals for the system. The
CRCU option must be installed for the system to
receive DTMF dialing. Both 4-circuit (CRCU-4)
and
8-circuit (CRCU-8) units are available, de-
pending on system traffic. The DTMF receivers
are shared by users; they are seized for dialing,
then released for the next call.
PIOU (Option Interface Unit):
The PIOU provides a
circuit interface with peripheral options as shown in
Table 2-C.
PIOUS (Option Interface Unit):
A reduced version of
the PIOU, the PIOUS provides a circuit interface with
peripheral options as shown in Table 2-C.
IMDU (Remote Maintenance Modem Subassem-
bly):
The IMDU is an optional built-in modem
which provides the system with a link to off-site
programming and maintenance equipment, such
as a personal computer or ASCII terminal. The
IMDU has an internal maintenance channel and
does not require a dedicated CO line or station
port. Data transmission speed can be set at 300
or 1200 BPS full duplex.
PEPU (External Page Interface Unit):
A reduced ver-
sionofthePIOU,thePEPUprovidesacircuitinterface
with peripheral options as shown in Table 2-C.
PESU (Standard/ElectronicTelephone Interface
Unit):
This optional PCB provides the system
with a combination of two standard and four
electronic telephone circuits. The standard tele-
phone circuits may also be connected to op-
tional hardware peripherals such as voice mail,
auto attendant and fax machines. The PESU
has a ring generator for the standard telephone
circuits which can be set for high- or low-ring
voltage. PESU electronic telephone circuits can
be configured for off-hook call announce by
installing an optional off-hook call announce
upgrade unit (EOCU). The PESU supports
HDCB and door phone/locks, but not DSS con-
soles or music-on-hold separation.
PCOU (CO Line Unit):
The PCOU provides the
system with four loop-start CO lines and a
standard, built-in automatic busy redial (ABR)
circuit. Each CO line can be programmed for
either rotary or dial pulse. In addition, each CO
line has a 3 dB pad option switch to control
excessive loudness resulting from close prox-
imity to the PBX or central office. Each CO line
circuit provides built-in gas tubes for limited
protection from lightning.
PCOU2 (CO Line Unit):
The PCOU2 is a direct
replacement for the PCOU. Their fit, form, and
function are identical; however, for manufactur-
ing reasons, the PCOU was phased out in favor
of the PCOU2.
.
PEMU (E & M TIE Line Unit):
The PEMU provides
four E & M Type I signaling (2- or 4-wire, imme-
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