Polycom EF2241 - Manual (Page 57)

C
ONNECTOR
P
INOUTS
© Polycom, Inc. 53 V ORTEX EF2241 Reference Manual
C
ONNECTING
U
NBALANCED
RCA
TO
B
ALANCED
M
INI
P
HOENIX
1. Connect RCA Tip to Phoenix pin 1.
2. Connect RCA Ring to Phoenix pin 2.
3. Connect Phoenix 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
EF2241 as it is built in.
Figure 31. Cable construction for connecting unbalanced RCA to balanced mini Phoenix (3 conductor terminal
block).
Red
Black
Red
Black
Shield
Tip
Ring
RCA Male Mini (3.5 mm) Phoenix
2
1
3
+
-
Caution! Do NOT connect the shield at both ends.
Caution! On the EF2241, Phoenix pin 3 is connected to
chassis ground. Under no circumstances should
Phoenix pin 3 be connected to pin 1 or to pin 2.
Doing so will add noise to the audio signal.
Figure 32. The terminator
1 2 3 4 5 6 7 8
110 Ω