E.F. Johnson Company 3000 SERIES, Setup And Alignment Manual

Page: 162 / 214

WIDE AREA MODULE (WAM)
19-6
19.6 WAM AUDIO CONNECTIONS
The audio of the WAMs are cross coupled to the
other WAMs and back to themselves if circuitry
permits. Connections to external circuits may require
summing and distribution amps, depending upon the
external interface.
When all Switches are co-located approximately
6 to 8 WAMs may be connected as shown in Figure
19-7.
Figure 19-7 WAM AUDIO CABLE LAYOUT
ONE LOCATION
A single WAM connected to a single external
interface is shown in Figure 19-8. This may be accom-
plished by direct wiring. Care must be taken on align-
ment and loading of the external interface not to
exceed line build out parameters or line levels. If this
cannot be prevented then an external summation and
distribution amplifier is required to avoid audio issues
(see Figure 19-9).
Figure 19-8 WAM AUDIO CABLE LAYOUT
TWO LOCATIONS
TXA+
TXA-
RXA+
RXA-
WAM 1
TXA+
TXA-
RXA+
RXA-
WAM 2
TXA+
TXA-
RXA+
RXA-
WAM ...
TXA+
TXA-
RXA+
RXA-
WAM 8
TXA+
TXA-
RXA+
RXA-
WAM
REMOTE LOCATION
TXA+
TXA-
RXA+
RXA-
MW
TXA+
TXA-
RXA+
RXA-
MW
TXA+
TXA-
RXA+
RXA-
WAM
HOST LOCATION
Figure 19-6 WAM E&M LEAD CABLE LAYOUT 3 LOCATIONS
EA
EB
MA
MB
MA
MB
EA
EB
TXS+ (MA2)
TXS- (MB2)
LINK
WAM/SWITCH 2
LOCATION 1 (CENTRAL)
MA
MB
EA
EB
TXS+ (MA2)
TXS- (MB2)
MA IN
MB IN
WAM/SWITCH 1
MA/OUT
MB/OUT
MA2/OUT
MB2/OUT
M-LEAD
SPLITTER BOX
MA IN
MB IN
MA/OUT
MB/OUT
MA2/OUT
MB2/OUT
M-LEAD
SPLITTER BOX
EQUIPMENT
EA
EB
MA
MB
MA IN
MB IN
MA/OUT
MB/OUT
MA2/OUT
MB2/OUT
M-LEAD
SPLITTER BOX
EQUIPMENT
LINK
EA
EB
MA
MB
LINK
EQUIPMENT
MA
MB
EA
EB
TXS+ (MA2)
TXS- (MB2)
WAM/SWITCH 3
EA
EB
MA
MB
LINK
EQUIPMENT
LOCATION 2
LOCATION 3