AT&T Release 2.0 manual Upgrading the Control Unit

Installing the Control Unit

Upgrading the Control Unit

When upgrading, do the following:

1.Remove the control unit housing:

a.Disconnect AC power from each auxiliary power unit at the wall outlet.

b.Disconnect AC power from each carrier by disconnecting the power cord at the wall outlet.

c.If the existing control unit is a MERLIN II Communications System, remove the housing as follows. See Figure 2-7.

i.Remove the front housing from each carrier by pulling the bottom-front towards you. When it releases, remove it by lifting up as shown in Figure 2-7.

ii.Remove the top from each carrier. in the system by pushing it straight up from the front.

iii.Discard the MERLIN II Communications System housing.

d.If the existing control unit is a MERLIN LEGEND Communications System, remove the housing as follows. See Figure 2-7.

i.From both sides of the control unit, pry the clips from the housing, using a screwdriver if difficult to reach.

ii.When the clips are freed from the housing, carefully pull the housing towards you.

NOTE:

If the system has more than one carrier, make sure you hold the housing only from the basic carrier side. Otherwise, the housing may disassemble.

iii.Do not discard the housing, unless new housing is provided. You will reassemble the housing when installation of the entire system is complete, as described in Chapter 7.

2-22Upgrading the Control Unit