Applications; Rdtu To Network; Rdtu To Pbx T1 (Separated More Than 655 Ft.) - Toshiba Strata DK14 Installation And Maintenance Manual

Applications

Each RDTU T1 PCB requires the following connecting equipment and cables to provide service
(see the following sections and

RDTU to Network

If the RDTU must interface to a public telephone network or common carrier T1 circuit, the
RDTU must be connected to a CSU. Use the NDTU cable (30 ft. cable supplied with RDTU) to
connect the RDTU to the CSU. The function of the CSU is to provide the required interface
between the 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 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

RDTU to PBX T1 (Separated More Than 655 ft.)

If the RDTU must interface to a customer's premises T1 circuit (PBX, key/hybrid, or another
DK424) to provide Tie line service, the RDTU must be connected to a CSU (with Toshiba NDTU
cable) if the other customer premise T1 equipment is more than 655 ft. from the RDTU. The T1
span on the other end must also connect to a CSU.
Strata DK
TOSHIBA
NDTU 30 ft Cable
RDTU
1665
Figure 6-4 RDTU Connection to Digital Network or OCC
The RDTU equalization switch (SW1) must be set for "SHORT" cable length because RDTU will
be connected to the CSU with the 30 ft. NDTU cable (see
Connecting CSU to CSU and CSU to the far-end PBX T1 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).
Strata DK I&M 5/99
Figure 6-4).
"RDTU Cable Installation").
DS-1
Network
Interface
CSU
Unit
Telco Digital Network or
Common Carrier
(AT&T, MCI, etc.)
Table 6-2).
DK424 T1
Applications
6-11