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1 INTRODUCTION
I .OO General Information
1.01
TheTl/DS-1
interface (NDTU) PCBprovides
PERCEPTIONeLex
with a capacity
of up to 24
digital circuits.
Up to two NDTU
PCBs may be
placed in a PERCEPTIONeLex
system,
so that a
maximum
of 48 digital circuits may be placed
in
service.
(Attachment
A describes
the Tl/DS-1
in-
terface
in greater
detail.) The second
NDTU PCB
must be installed
in the expansion
cabinet.
1.02
Each NDTU
PCB can be programmed
to
activate 4, 8, 12, 16, 20, or 24 of the digital trunks.
The remaining
slots can be assigned
to analog
trunks, so that a mix of analog and digital trunks can
be switched
in the PERCEPTIONekex
systems.
This internal
"fractionalized"
use of the Tl/DS-1
interface
is unique
in the industry.
I .I 0 Requirements
1.11 Span:
Each
PERCEPTIONe,exTl
span
requires
the following
configuration:
l
One NDTU
PCB for each Tl span (Tl/DS-1
interface).
l
A customer-provided
Channel
Service
Unit
(CSU) for each span connected
to the network,
or for a span between
PBXs that are more than
655 feet apart (see Attachment
B for CSU infor-
mation).
l
A 30 foot amphenol-type
to DB15 connector
cable (PBX-to-CSU
cable) is provided with each
NDTU.
IMPORTANT
NOTE:
The
maximum
distance
between
PERCEPTION,,
and the CSWDSU
is 30
feet. Toshiba
provides
the proper
cable for
this connection
with each NDTU PCB. Its
installation
is required
forproperoperation.
I .I2 System:
Each PERCEPTIONehex
system
requires
the following
configuration:
l
One NTWU-3
PCB.
l
D.01,
or higher level software.
l
A cable between
NTWU-3
and the first NDTU.
(The cable is provided
with each NDTU.)
'If
'I
-
.A
,>H,vI-/
PERCEPTION,~,,
Tl/DS-1
SEPTEMBER 1991
I .I3 Applications:
1) A TI/DS-1
interface
(span) can be connected
to the network,
and can provide
up to 24 (in
units of 4) FX, DID, TIE, and Loop Start or
Ground Start CO trunks in any combination.
A
CSU is required
for this configuration
(see
Figure 1).
PERCEPTIONeaex
FIGURE I-DS-1
CONNECTION TO DIGITAL
NETWORK
2) A Tl span can also be used to connect
digital
TIE trunks
(Type
I or Type
II) between
PERCEPTIONeLex
and another
PBX, with
either Tl equipment,
or with an analog
PBX
using channel banks (see Figure 2). A CSU is.
required at each PBX, if the distance
between
FIGURE 2-DS-1 CONNECTION VIA CSU
-l-
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