Connecting Unbalanced Rca To Balanced Terminal Block; Making An Ef Bus Terminator - Polycom Vortex EF2280 Reference Manual

C U
ONNECTING NBALANCED
RCA Male
Tip
Ring
Figure 31. Cable construction for connecting unbalanced RCA to balanced 3 conductor terminal block.
M EF B
AKING AN
Figure 32. The EF Bus terminator
Instructions
V EF2280 Reference Manual
ORTEX
RCA
TO
Red
Black
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.
Caution!
Do NOT connect the shield at both ends.
Caution!
On the EF2280, terminal block pin 3 is connected to
chassis ground. Under no circumstances should pin 3
be connected to pin 1 or to pin 2. Doing so will add
noise to the audio signal.
T
US ERMINATOR
1 2 3 4 5 6 7 8
To make a terminator (for use when connecting legacy EF2280s with inline audio
connections), use an RJ45 connector. Connect pin 3 to pin 6 with an 110 Ohm resistor.
A terminator is not required for the EF2280's with stacked audio connections as the
terminator is built-in.
B T
ALANCED ERMINAL
110 Ω
60
C
ONNECTOR
B
LOCK
3.5 mm Terminal Block
Connector
Red +
Black
-
Shield
Technical Support: 800.765.9266
P
INOUTS
1
2
3