Polycom Vortex EF2210 - Connecting Unbalanced RCA to Balanced Terminal Block; Making an EF Bus Terminator

CONNECTOR PINOUTS
VORTEX EF2211/EF2210 Reference Manual 54 Technical Support: 800.932.2774
C ONNECTING U NBALANCED RCA TO B ALANCED T ERMINAL B LOCK
1. Connect RCA Tip to terminal block pin 1.
2. Connect RCA Ring to terminal block pin 2.
3. Connect terminal block pin 3 to Shield, and leave Shield floating on RCA end.
M AKING AN EF B US T ERMINATOR
Instructions To make a terminator (for use when connecting EF2280s), use an RJ45 connector.
Connect pin 3 to pin 6 with an 110 Ohm resistor. A terminator is not required for the
EF2211/EF2210 as it is built in.
Figure 30. Cable construction for connecting unbalanced RCA to balanced 3-conductor terminal block.
Red
Black
Red
Black
Shield
Tip
Ring
RCA Male
3.5 mm Terminal Block
Connector
2
1
3
+
-
Caution! Do NOT connect the shield at both ends.
Caution! On the EF2211/EF2210, the terminal block pin 3
is connected to chassis ground. Under no cir-
cumstances should pin 3 be connected to pin 1
or to pin 2. Doing so will add noise to the audio
signal.
Figure 31. The terminator
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110 Ω