Ericsson LBI-39076B - Manual (Page 43)

MAINTENANCE LBI-39076B
43
MAINTENANCE
GTI REMOVAL
When you are about to remove a GTI from an EDACS
Repeater cabinet in a working system, you must take special
care to avoid disrupting the system. There are two
recommended procedures: one procedure for when the GTI
is connected to a MASTR II or IIe EDACS Repeater, and
the other procedure for when the GTI is connected to a
MASTR III EDACS Repeater.
If you are upgrading the software in the GTIs, see the
Software Replacement heading in the Maintenance section
of this manual.
MASTR II or IIe Repeaters
Use the following procedure to disconnect a GTI from a
MASTR II or IIe EDACS Repeater. (An alternative to using
the jumper in step 3, is to disable the radio channel through
the System Manager (RF parameter in screen 20, panel 1:5).
However, this reduces the number of available radio
channels by one and therefore should only be used for a very
short period of time, if at all.)
1. Disable the Interconnect parameter through the
System Manager (screen 10, panel 1) for the
specific channel number associated with the GTI
being removed.
2. Disable the Line Active parameter through the
System Manager (screen 14) for the specific
channel number associated with the GTI being
removed.
3. Add a jumper between pins 2 and 3 of the
Power/Audio plug on the back panel of the GTI
(see Figure 45).
1 2 3 4 5 6
Temporary Jumper
Power/Audio
Back Panel of GTI
Plug
Figure 45 - Position of Temporary Jumper
4. Disconnect the Power/Audio plug from the back
panel of the GTI (you will need a pair of pliers to
pull the plug out of the recessed connector).
5. Disconnect the Phone plug from the back panel of
the GTI.
6. (Master GTI only) Disconnect the two Site
Controller data link plugs from the back panel of
the Master GTI.
7. Disconnect the PCM Data Bus from the back panel
of the GTI. If there are two cables (or one cable
and a termination) quickly reconnect the two cables
(or the cable and the termination) back together
without the GTI and let hang).
It is necessary to temporarily separate the two
PCM Data Bus cables when disconnecting them
from a GTI. While separated, all GTIs
connected to higher numbered radio channels
will not be connected to the Master GTI and may
cause interconnect abnormalities such as dropped
calls and/or alarms.
NOTE
Use the preceding procedure in reverse to reconnect the
GTI to the MASTR II or IIe EDACS Repeater. Don’t forget
to remove the jumper between pins 2 and 3 on the
Power/Audio plug after plugging it into the GTI.
MASTR III Repeaters
Use the following procedure to disconnect a GTI from a
MASTR III EDACS Repeater. (No jumper is needed.)
1. Disable the Interconnect parameter through the
System Manager (screen 10, panel 1) for the
specific channel number associated with the GTI
being removed.
2. Disable the Line Active parameter through the
System Manager (screen 14) for the specific
channel number associated with the GTI being
removed.
3. Disconnect the Power/Audio plug from the back
panel of the GTI (you will need a pair of pliers to
pull the plug out of the recessed connector).
4. Disconnect the Phone plug from the back of the
GTI.