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Installing the Model 3550 DSU
2-53550-A2-GB20-10 February 1995
Power-Up Routine
When power is applied, the DSU:
• Determines what options (DBM or TDM/Flex) are
installed, if any.
• Runs a Device Test on itself and each of the
installed options.
During the tests, all indicators on the DCP light
briefly and the message Power-Up Tests appears on
the liquid crystal display (LCD).
• Displays the results of each test momentarily as
Pass, Fail, or Abrt. (Abrt indicates that the Device
Test was aborted because a network loopback was
in progress during the power-up procedure.) These
tests take about 20 seconds to complete.
If a TDM/Flex is installed, MUX is displayed as
Pass or Fail.
If the DSU, DBM, or TDM/Flex (MUX) fails this test,
follow these steps. Refer to Appendix A as you perform
the procedures described in this guide. Refer to Chapters 4
and 5 for additional examples and procedures.
Procedure
1. Press the
key to return to the top-level menu.
2. Select Local (F1 key).
3. Press the
key to scroll the Confg
(Configuration) branch into view.
4. Press the function key directly below Confg.
5. Press the F1 key to select Opts (Configuration
Options).
The Load from screen appears.
6. Press the
key to bring the factory-loaded unit
configurations into view, and select the
appropriate configuration.
• PTPC for a point-to-point control
• PTPT for a point-to-point tributary
• MPTC for a multipoint control
• MPTT for a multipoint tributary
7. Press the F1 key to SAVE the selected
configuration.
The Save to screen appears.
8. Save the selected configuration to Activ
(F1 key).
9. Press the
key to return to the top-level menu,
then select Local again.
10. Select Test (F3).
The Run Test on screen appears.
11. Select the device that Failed: the DSU (or the
TDM/Flex) or DBM.
12. Press the F2 key to run the Device Test again.
The device should pass.
13. Should the device fail, return the unit to the
AT&T Paradyne Repair Center (see Chapter 1).
Connecting to the Network
The DSU provides three interfaces (often called a
jack). One jack connects the DSU to the 6700 Series
NMS, one connects the DSU to the dial (or public
switched telephone network – PSTN) network, and one
connects the DSU to the DDS network. Follow the
appropriate procedure when making your network
connections.