Toshiba Strata CTX100, Installation And Maintenance Manual

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T1
Applications
Strata CTX I&M 10/02
6-5
T1
6. Refer to “Hardware and Cabling” on page 6-7 for the appropriate SW1 Equalizer Switch
setting and set SW1 to the setting that matches the RDTU cable length
7. Install CSUs and wire them to the RDTU and Network Interface Unit (NIU) or Customer
Premises T1 circuit as required (see Figure 6-2 ).
Note Before connecting the CSU to the Telco line, notify the T1 provider. You should also notify
the T1 provider before disconnecting the CSU.
Figure 6-3 CSU Local and Network Loop Back Tests
8. Perform CSU to RDTU and CSU to Network loop back testing per CSU documentation and
“Loop Back Testing” on page 6-10 .
Notes
●
Local loop back and network loop back test cannot be performed simultaneously.
●
CSU local/network loop back is a function of the CSU, not all CSUs provide this function –
see CSU I&M documentation for CSU loop back test procedures.
9. After loop back testing is complete and synchronized with the far end T1 circuit, perform test
calls on all RDTU lines.
Applications
Each RDTU T1 PCB requires the following connecting equipment and cables to provide service
(see the following sections and
Figure 6-4 ).
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 Cable Installation” ).
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
Strata CTX) to provide Tie line service, the RDTU must be connected to a CSU (with Toshiba
Transmit
Receive
CSU NIU
Receive
Transmit
Local Loop Back Network Loop Back
CTX RDTU
Network
5801