Recommendation For The Signal Lines - Federal Signal SelecTone Command Units 300VSC-1 Manuel D'installation Et D'entretien

Installation and Maintenance Manual
Tone 1, Tone 2, Tone 3, Tone 4, Sig. Out, Aux., Test and Cancel Relays
Type
Rating
Local PA
Remote Mic
Aux Input
Line Output (40 Ω load)
F1
F2
Model VSC-1
Weight
Dimensions (WDH)
Model VSC-1044SB
Weight
Dimensions (WDH)

Recommendation for the Signal Lines

The signal lines transfer tone signals and verbal messages from the 300VSC to the remote SelecTone
devices. To reduce the possibility of cross talk, hum, and static-noise pickup, the signal lines must be
twisted-pair, shielded audio cable. In the majority of systems, use AWG 18 shielded twisted-pair audio
cables. Federal Signal does not recommend that new or existing telephone lines be used as signal lines in a
SelecTone system for the following reasons:
✓ Interference from other services or systems, or interference from the system to other services
✓ Cross talk, interference, or hum induced by other telephone lines
✓ Extended downtime because of the second party involvement required to service the lines
✓ The additional cost of installation, interfacing devices and monthly charges as opposed to a one-time
cost of performing the installation
10
Table 1 Product specifications (continued)
Remote Contact Closure Outputs
Signal to Noise Ratio (< 3% THD)
Audio Distortion From Aux Input to Balanced Signal
Dimensions and Weight
REDUCED SOUND OUTPUT — If too small a diameter cable is used, unacceptable
signal voltage drop in the signal line will cause reduced sound output from the
remote signal device. Only use a cable having wire diameter greater than 22 AWG.
Model 300VSC-1 and Model 300VSC-1044SB SelecTone Command Units
Dry contact closure
24 Vdc, 1 A, resistive
60 dBA
40 dBA
80 dBA
2 %
Fuses
Type GMC-1, 1 A, 250 V
Type GMC-1/2, 1/2 A, 250 V
4.125 lb (1.88 kg)
10.5 in x 9.25 in x 2.44 in
26.67 cm x 23.50 cm x 6.20
7.9 lb (3.58 kg)
19.0 in x 10.0 in x 3.5 in
48.26 cm x 24.40 cm 8.89 cm