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7) Refer to Figure 4-47, and locate the HHEU
strap, W303, on the upper PCB. Cut the strap
if the HHEU PCB is to be connected to a
headset.
8) Reinstall the telephone' s mounting base and
secure it with its four captive screws.
6.70 Attendant Console Connection
6.71 See Paragraph 5.50 for the attendant console
connection.
6.80 DSS Console Connections
6.81 See the DSS Program in Section 200-255-
300, Programming, to input information concern-
ing the digital DSS consoles.
6.82 The DSS console must be positioned adja-
cent to a digital telephone (preferably an LCD
model). DSS consoles use 2-pair wiring and are
connected to the MDF via standard twisted-pair
telephone cables. An RJ25 modular connector
should be attached to the instrument-end of the
telephone cable to permit connection to the DSS
console.
6.83 The overall length of the DSS console cable
run from the equipment cabinet must not exceed
1000 feet (304 M), 24 AWG cable.
IMPORTANT!
When installing the DSS console cable, do
not run parallel to and within 3' of an AC
power line. Such power lines should be
crossed at right angles (90") only.
6.84 DSS console(s) connection details are shown
in Figures 4-49 and 4-50, for both PERCEPTION,
and ex.
6.90 DIGITAL DATA INTERFACE UNIT (PDIU)
6.91 The Perceptione8ie, with D.04 software pro-
vides two new style digital Data Interface Units
(DIUs) that enable digital telephone users to si-
multaneously transmit and receive data on the
same NDKU station port and wire pair while com-
INSTALLATION
INSTRUCTIONS
SECTION 200-255-204
FEBRUARY1992
municating on a voice call. One unit, called the
integrated DIU (PDIU-DI) replaces the digital
telephone' s base; the other unit is a small self-
contained box called the stand-alone DIU (PDIU-
DS). Each DIU is powered by the NDKU PCB it is
connected to; therefore, no external power is re-
quired.
6.92 Both PDlUs can be connected to standard
Electronic Industries Association (EIA) RS-232
asynchronous serial data devices. EIA devices
are divided into two categories:
l
Data communication equipment (DCE). Com-
mon DCE devices are modems and some print-
ers.
l
Data terminal equipment (DTE). Common DTE
devices are personal computers, ASCII termi-
nals, and some printers.
.The PDIU-DI operates like a DCE, and it connects
directly to DTE devices using standard RS-232
cables. Depending on how its internal jumper
plugs are configured, the PDIU-DS can either
operate like a DTE and connect to DCE devices, or
operate like a DCE device and connect to a DTE
device. In most applications, DTE and DCE devices
exchange data between each other via the stan-
dard RS-232 cable connection.
6.93 PDlUs can function with DCE and DTE de-
vices at data speeds of up to 19.2kbps; however,
keyboard dialing using AT commands (from a PC
or a terminal connected to a PDIU) is limited up to
9.6kbps. PDIU data transmission speed is set by
the first AT command that the PDIU receives once
it is in the command mode. The transmission
speed is transparent to the PDIU if data is being
sent via manual dialing or if the PDIU is receiving
calls.
NOTES:
1. See the DDIU
Program
in Section 200-
255-300 for information on programming
the Digital Data interface Units. The sys-
tem must be told which type of PDIU
(-DI
or -DS) is installed at each location.
2. Digital Data interface Unit (PDIU-DI and
PDIU-DS) connection details are shown
in Figure 4-42, the Digital Telephone
Connection diagram.
4-37
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