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909A/B universal coupler
555-233-116
26 Issue 4 October 2002
Figure 1. Typical 909A/B universal coupler
The 909A is the direct current (DC) version of the coupler, and cabinet power
supplies -48 VDC power. The 909B is the alternating current (AC) version, and
power is supplied from a separate power supply (such as the KS-22911L2).
The DIP switches on the unit set:
■ Protection/Paging selection — For AUX trunk paging and malicious call
trace, set to C2. Set the switch to C1 for all other applications.
■ Output attenuation (-9 or -15 dBm) — Setting depends on output level of
music source.
■ Output impedance (8 ohms, 1.5 kΩ, and 50 kΩ) —This switch only
requires setting if the Protection/Paging switch is set to C2 and the coupler
is supplying background music to a customer-supplied paging amplifier.
The pinouts for J1, J2, and J3 are provided in Table 2, Table 3, and Table 4. Refer
to these tables when connecting music or paging equipment.
1. 909A/B universal coupler
2. J1 8-pin modular jack
3. J2 8-pin modular jack
4. J3 7-pin modular jack
5. DIP switch location
909
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brktKLC 042296