Installing the Model 3550 DSU
2-53550-A2-GB20-20 December 1996

Power-Up Routine

When power is applied, the DSU:
•Determines what options (DBM or TDM/Flex) are
installed, if any.
•
Runs a Device T
est on itself and each of the
installed options.
During the tests, all indicators on the DCP light
briefly and the message
Power-Up T
ests
appears on
the liquid crystal display (LCD).
•
Displays the results of each test momentarily as
Pass, Fail, or Abrt. (Abrt indicates that the Device
T
est was aborted because a network loopback was
in pr
ogr
ess 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 fr
om
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 T
est 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 T
est again.
The device should pass.
13. Should the device fail, call your service
representative. (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.