Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
Type III Interface
Battery
Detector
Ground
Detector
M
M
E
E
R
P
Trunk Circuit
Signaling
-48V
SB
SB
SG
SG
-48V
VF-5A
Ferrod
Senso
98Ω 38Ω
Battery
Detector
Ground
Detector
M
M
E E
R
P
Trunk Circuit
Signaling
-48V
SB
SB
SG
SG
-48V
VF-5A
-48V
Battery
Detector
Ground
Detector
M
M
E E
R
P
R
Trunk Circuit
Signaling
VF-5A
-48V
Type II Interface
Type I Interface
Figure 9. E&M signaling types
E&M SIGNALING
The E&M signaling jumper is set according to the type of E&M signaling being used. Refer to Table 1
and Figures 7 and 9 for more information.
Type I. Type I signaling is a two-wire scheme, normally encountered in electromechanical switching
systems. The trunk circuit M lead provides the ground (on hook) and the battery -48V (off hook)
toward the model VF-5A module. The signaling from the VF-5A to the trunk circuit is on the E lead
with open circuit (on hook) and ground (off hook).
Type II. Type II signaling is a four-wire scheme, normally encountered in electronic switching
systems. An on-hook (idle) condition is indicated by open circuits on both E and M leads and a closure
for off-hook (busy).
RFL VF-5A RFL Electronics Inc.
June 28, 2005 17 (973) 334-3100
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