Applications; Rdtu To Network - Toshiba DK14 Installation And Maintenance Manual

5. Run the RDTU self check per
passes, put P1 and P2 to the Off position for normal operation and insert the RDTU PCB back
into the appropriate slot.
6. Install CSUs and wire them to the RDTU and Network Interface Unit (NIU) or Customer
Premises T1 circuit as required (see
.
8-3
Before connecting the CSU to the Telco line, notify the T1 provider. You should also
Note
notify the T1 provider before disconnecting the CSU.
DK RDTU
Transmit
Receive
Local Loop Back
Figure 8-3 CSU Local and Network Loop Back Tests
7. Perform CSU to RDTU and CSU to Network loop back testing per CSU documentation and
"Loop Back Testing"
Notes
Local loop back and network loop back test cannot be performed simultaneously.
G
CSU local/network loop back is a function of the CSU, not all CSUs provide this function –
G
see CSU I&M documentation for CSU loop back test procedures.
8. After loop back testing is complete and synchronized with the far end T1 circuit, perform test
calls on all RDTU lines. (Use the troubleshooting procedures in
8-18 to help correct problems.)
9. Check T1 performance periodically for transmission errors using the "T1ERR" test. This
requires a local or remote maintenance terminal connected to the PIOU or PIOUS PCB (local)
and IMDU or Hayes-compatible modem (remote).

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.
Strata DK I&M 5/00
"Network/CSU T1 Span Test"
Figure 8-3). See
CSU
Receive
Transmit
Network Loop Back
on Page 8-14.
Figure 8-4).
on Page 8-15. After self check
"System Programming for T1"
NIU
Network
"T1 Fault Isolation"
T1
Applications
on Page
5237
on Page
8-9