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Installation and Maintenance Manual
Model 300MB-SD CommCenter Series D1
Figure 5 Cascading multiple units
GROUND
MASTER
SLAVE
SIGNAL ENABLE
CASCADE
OUT
120/240 Vac
GROUND
290A7317
10
2 1
171615 14
1
10
16
12 11
1
1
TB2
TB1
TB2
GAIN
CNTR
GAIN
CNTR
TB1
120 Vac
120 Vac
120 Vac
LOCAL PWR.
LOCAL PWR.
POWER LINES
MODEL
300GC
MODEL 300MB
MODEL 300MB
MODEL
AM25CK
SIGNAL LINES SHIELDED
TWISTED PAIR
SIGNAL
ENABLE
CASCADE IN
120/240 Vac
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Connecting a Low-Level Audio Output
The 300MB also has a 1 Vpp audio output that is designed to drive the cascaded input of a slave
CommCenter. This low-level output is available across terminals TB1-16 and TB1-17. It can also be
connected to an analog fiber optic transmitter so that audio can be transmitted over a fiber-optic link in
an electrically noisy environment.
Typical Installations of the 300MB
This section describes four typical installations of the 300MB system.
As a SelecTone Control Center
In this installation, shown in Figure 6, the CommCenter is acting as a SelecTone control center driving a
25 Vrms signal line. Remote speaker/amplifiers have the signal coupled in through an AM25CK.
Figure 6 CommCenter as a SelecTone control center
GROUND
290A7321
10
1
1716 15
1
TB2
TB1
GAIN
CNTR
MODEL 300GC
MODEL 300MB
MODEL AM25CK
SIGNAL LINES SHIELDED
TWISTED PAIR
120/240 Vac
120 Vac
120 Vac
LOCAL PWR.
LOCAL PWR.
POWER LINES
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