Toshiba Strata DK 280 Installation Manual page 627

11.2 DK280 Tl General Installation
Information
,
11.2.1 RDTU Channelization
The Strata DK280 RDTU PCB provides Ti/DS-1
interface up to 24 channels. Each channel can be
individually set for loop start, ground start, tie, or DID
line operation (voice only, not data lines). Each RDTU
can be set in system programming to activate (l-8),
(l-16), or (l-24) channels (lines). Fractional
increments of 4, 12, and 20 are also possible but the
RDTU will still assign 8, 16, or 24 channels
respectively in system software. Example: If only 12
channels of fractional Tl are used, assign RDTU as a
16 channel RDTU. The system will assign 16 CO lines
to the RDTU even though only 12 CO lines will be
used. To busy out unused RDTU channels (see
Section 11.4, Step 4). Use Program 03 to set the
quantity of RDTU channels.
11.2.2 RDTU Slot Assignments
Up to six RDTU PCBs can be installed in a DK280 to
provide up to 144 lines. RDTU PCBs can be installed
in the same cabinets that have analog type CO line
PCBs installed. RDTU PCBs must be placed in
designated slots in each of the DK280 cabinets. If an
RDTU is installed in a cabinet (in some cases one or
two slots to the right of the RDTU may not be used in
that cabinet) the number of unusable slots in a cabinet
(none, 1 or 2) depends on which slot the RDTU
occupies and how many lines (8, 16, or 24) the RDTU
is programmed to provide (see Tables 1 l-1, 1 l-2 and
1 l-3 for RDTU slot installation rules). Use Program 03
to set the RDTU slot assignments and Channel
quantities (Code 71 = 8 ch., Code 72 = 16 ch., and
Code 73 = 24 ch.).
11.3 DK280 RDTU (Tl) Applications
Each RDTU Tl PCB requires the following connecting
equipment and cables to provide service:
11.3.1 RDTU to Network
If the RDTU must interface to a public telephone
network or common carrier Tl circuit, the RDTU must
be connected to a Channel Service Unit (CSU). Use
the NDTU cable (30 ft. cable supplied with RDTU) to
connect the RDTU to the CSU (see Figure 1 i-l). The
function of the CSU is to provide the required interface
between the DK280 RDTU PCB and the Public
Telephone or Carrier Network. The interface created
by the CSU normally provides protection and
capabilities for loop back testing both the Network
equipment and the DK280 RDTU PCB. _
Connecting the CSU to the Network Interface Unit
(NIU) is specified by the CSU manufacturer-see CSU
installation documentation. Toshiba does not supply
the cables and connectors required to connect the
CSU to the NIU (see Subsection 11.5.4 of this
chapter).
11.3.2 RDTU to PBX Tl (Separated More
Than 655 ft.)
If the RDTU must interface to a customer's premises
Tl circuit (PBX, key/hybrid, or another DK280) to
provide tie line service, the RDTU must be connected
to a CSU (with Toshiba NDTU cable) if the other
customer premise Tl equipment is more than 655 ft.
STRATA DK280 TOSHIBA
PBX OR
,
, NDTU cable CABLE
CABLE KEY/HYBRID
RDTU
I
More than 655 ft.
General Note:
l
Cable A, B and connectors are special cables
supplied by customer (see Subsection 11.5.4).
DK0510
Figure 11-2
RDTU Connection via CSU
from the RDTU. The Tl span on the other end must
also connect to a CSU (see Figure 11-2).
The RDTU equalization switch (SWl) must be set for
"SHORT" cable length because RDTU will be
connected to the CSU with the 30 ft. NDTU cable (see
Table 1 l-4).
Connecting CSU to CSU and CSU to the far-end PBX
Tl is specified by the CSU manufacturer-see the
CSU installation documentation. Toshiba does not
supply cables or connectors to connect CSU to CSU
(Cable A) or CSU to the far end PBX (Cable B).
January
1996
11-3