Figure 65 Telephones And Addressable Modules Showing Shielded Wiring (Class A); Figure 66 Telephones And Addressable Modules Showing Shielded Wiring (Class B) - Mircom FleX-Net BBX-1024DS Application Manual

• For class B wiring, leave the shield unconnected at the end of the line.
twist-on connector
+
LAST
−
Firephone
Module
MIX-M500FP(A)
twist-on connector
twist-on connector
+
FIRST
−
Firephone
Module
Shield
MIX-M500FP(A)
Shield
to S terminal
near the RS-485
on main fire
alarm board
−
+
Main
TNC-5000
Board
Figure 65 Telephones and addressable modules showing shielded wiring
(Class A)
twist-on connector
twist-on connector
twist-on connector
Shield
Shield
to S terminal
near the RS-485
on main fire
alarm board
Main
Board
Figure 66 Telephones and addressable modules showing shielded wiring
(Class B)
Addressable Loop Interference on Phone Handset Lines
Shield
twist-on connector
Shield
+
−
− +
+ −
Shield
twist-on connector
Shield
+
−
− +
+ −
Shield
twist-on connector
Shield
+
LAST
+
−
−
Firephone
Module
MIX-M500FP(A)
Shield
twist-on connector
Shield
+
+
FIRST
−
−
Firephone
Module
MIX-M500FP(A)
−
+
TNC-5000
twist-on connector
Shield
− +
twist-on connector
Shield
− +
twist-on connector
Shield
− + − +
twist-on connector
Shield
− + − +
E.O.L.
3.9 kΩ
E.O.L.
3.9 kΩ
91