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INSTALLATION INSTRUCTIONS
SECTION 200-255-202
JANUARY 1993
2)
3)
4)
Option 2: Eight digital telephones with
integrated Data Interface Unit (PDIU-DI)
or Off-hook Call Announce. This position
also supports Stand-alone Data Inter-
face Units (PDIU-DS).
Option 3: Four digital DSS consoles. In
PERCEPTION, COO and CO1 may be
used for this option only.
Option 4: Eight digital DSS consoles.
NOTE:
When using Option
2 or 4,
the next
highest
number adjacent card slot
cannot
be used.
For example: If an NDKU is installed in LO1 or
UO 7, the card slot LO2 or UOZ respective/y,
must be left vacant.
NSTU (Standard Telephone
Unit)-Interfaces
eight standard telephones (DTMF or rotary dial)
to the system.
NDSU (DSS Console Controller
Unit)-Interfaces
four DSS consoles to the system. The NDSU is
installed in the COO or COI, or any line slot for
PERCEPTION,; or in any universal slot for
PERCEPTIONex. A maximum of two NDSU
PCBs are allowed per system, and both can be
installed in the same cabinet.
NDCU (Data Control
Unit)-Interfaces eight Digi-
tal Data Interface Units (DDIUs) to the system.
The NDCU controls data transmission between
the DDIU and the cabinet. A maximum of four
NDCU
PCBs may be installed
in each
PERCEPTlONe cabinet. In the PERCEPTIONex,
four PCBs per shelf can be installed.
NMDU (Modem Pooling
Unit)-Interfaces
up to
four modems and their associated DDIU-MAs.
Any of the four DDIU circuits not required by a
modem can be used with a standard DDIU (-MA
or -MAT). A maximum of four NMDU PCBs may
be installed in each PERCEPTlONe cabinet. In
the PERCEPTIONex, four PCBscan be installed
per shelf.
NOTE:
The system maximum of NDCU or NMDU
PCBs consists of any combination of the two
PCBs
totaling
four per
cabinet
for
PERCEPTlONe
and four per she/f for
PERCEPTION,, .
NCOU (Central Office Trunk Unit)-One
per four
CO trunks: Provides the signaling supervisory
functions on loop- and ground-start trunks. Inter-
faces four CO trunks to the system. These trunks
can be incoming, outgoing, or both way CO
trunks; WATS trunks, or Foreign Exchange (FX)
trunks.
NEMU (E & M TIE Trunk Unit)-One
per four E &
M TIE trunks: Each TIE trunk can be individually
strapped for Type I or II operation with either 2-
wire or 4-wire connection.
NLSU (DID Trunk Interface
Unit)-One
per four
DID trunks: Each NLSU connects four Direct
Inward Dialing (DID) trunks to the system.
NDTU (Tl
Interface)-Maximum
of two per sys-
tem (one in the main cabinet, one in the expan-
sion cabinet): Each NDTU provides a' maximum
of 24 trunk lines. The Digital Trunk printed circuit
card enables the PERCEPTIONehex systems
to use DSl signaling to connect directly to either
Tl span lines which connect to the telco (through
a Channel Service Unit), or to a private network.
NOCU (Off-hook Call Announce interface Unit)-
One per eight electronictelephones. Each NOCU
provides eight Off-hook Call Announce circuits
for up to eight electronic telephones. Each NOCU
takes a station PCB location in the cabinet.
HVSUP (Off-hookCall Announce
PCBs)--Install
1
inside the electronic telephone. One unit per
electronic telephone is required to receive off-
hook call announce.
DVSU (Digital Off-hook Call Announce
PCB)-
1
Installs inside the digital telephone. One unit per
digital telephone is required to receive off-hook
call announce.
2-6
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