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NOTE:
X = the option is provided.
and maintenance equipment, such as a per-
sonal 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.
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The IMDU mounts on top of the option
interface unit (PIOU or PIOUS) piggy-back
style.
STRATADK
GENERALDESCRIPTION
DECEMBER1990
TABLEI
OPTIONALINTERFACE-PCB OPTIONS
Interface Option
PIOU
Unamplified page output (single zone, 600 ohms, duplex)
X
Amplified page output (single zone, 3 watts, 8 ohms)
X
Zone page interface (unamplified, 4 zones)
X
Night transfer or music-on-hold control relay X
Door lock or external amplifier control relay
X
PIOUS
X
X
X
PEPU
X
X
X
X
I
I
I I
I
Alarm sensor
SMDR output (RS-232/6-wire modular connector)
Maintenance port for a local ASCII terminal or external
modem (RS-232/6-wire modular connector)
Remote maintenance modem (IMDU subassembly, no
external connector)
X X
X
X
X
X
X
X
CO Line Unit (PCOU): 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 to
be either DTMF or dial pulse. In addition, each
CO line has a 3 dB pad option switch to con-
trol excessive loudness resulting from close
proximity
to the PBX or central office. Each
CO line circuit provides built-in gas tubes for
limited protection from lightning.
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A maximum of four PCOU PCBs can be
installed in
DK24
to provide sixteen CO
lines, five
PCOU PCBs can be
installed in
DK56 to provide twenty CO lines, and nine
in
DK96 to provide thirty-six CO lines.
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Connections from the PCOU to the MDF
are made with modular connectors, each
with two circuits.
E 81 M TIE Line Unit (PEMU): The PEMU pro-
vides for E & M Type I signaling, immediate-
start TIE lines. Each PEMU reduces the maxi-
mum system capacity by four CO lines and
four stations (four CO lines and eight stations
if the PCTUS is used). A choice between 2- or
4-wire transmission is available as a jumper-
plug option.
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A maximum of one PEMU can be installed
in DK24 to provide four TIE lines, two in
DK56 to provide eight TIE lines, and three
in DK96 to provide twelve TIE lines (see
Table K for details).
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Connections from the PEMU to the MDF
are made with modular connectors, each
with one circuit.
Digital Telephone Interface Unit (PDKU)t: The
PDKU provides eight
ports for digital tele-
phones and data interface units (PDIU-DI
and
PDIU-DS). It can support one DDSS console.
PDKUs supporting digital telephones with off-
hook call announce do not require an EOCU.
t Requires Release 3 software
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