COMSPHERE 3600 Series Data Service Units
2-8 March 1999 3610-A2-GB41-60
Electrical Connection
CAUTION
The power cord with ac
transformer contains a 3-wire
grounding-type plug which
has a grounding pin. This is a
safety feature. Grounding of
the unit is vital to ensure safe
operation. Do not defeat the
purpose of the grounding
plug by modifying it or by
using an adapter.
Prior to installation, use an
outlet tester or voltmeter to
check the ac receptacle for
earth ground. If the power
source does not provide a
ground connection, consult
an electrician to determine
another method of grounding
the unit before proceeding
with the installation.
To power up the DSU:
"Procedure
1. Use a non-switched, 3-prong grounded ac wall
outlet capable of supplying the specified voltage
and current.
2. Label the circuit breaker that protects the wall
outlet and be sure it is set to ON.
3. At the rear of the DSU (Figure 2-7), insert the
small end of the power cable into the power
receptacle.
If you have a table-top ac transformer, connect the
3-prong plug to the ac outlet. If you have a
wall-mount ac transformer, connect the
ac transformer to the ac outlet.
The unit performs a power-up routine.
CAUTION
Only use the power transformer
designed for the Model 3610
DSU. Using other transformers
may result in personal injury or
damage to the equipment.
4. Reinstall the factory configuration options; use the
FacT configuration for a tributary or FacC for a
control.
5. Make any desired configuration changes in the
DSU, Diag, DBM, Gen, Bckup, MUX, PrtSp, and
LPDA-2 option sets.
For information on the TDM, MCMP, or digital
bridge option sets, refer to the Unit Configuration
section of this guide and the COMSPHERE
3600 Series Data Service Units, Models 3610 and
3611, User’s Guide or the COMSPHERE 3600
Series Data Service Units, Models 3610 and 3611,
Operator’s Guide.

Power-Up Routine

When power is applied, the DSU:
•Determines what options are installed (DBM or
MUX – the TDM or MCMP).
•Runs a Device Test on the unit 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. These tests take about
20 seconds to complete. Abrt indicates that the
Device Test was aborted because a network
loopback was in progress during the power-up
procedure.
When a TDM or MCMP is installed, MUX is
displayed as Pass or Fail.