Recommendation For The Signal Lines - Federal Signal Corporation D1 Series Installation And Maintenance Manual

Installation and Maintenance Manual
Chip Input
40 Ω Max. Load, from 250 Hz to 80 kHz
(Reference 1 kHz)
40 Ω Max. Load, from 450 Hz to 60 kHz
(Reference 1 kHz)
No Load, from 100 Hz to 90 kHz
(Reference 1 kHz)
No Load, from 200 Hz to 60 kHz
(Reference 1 kHz)
Line Output (40 Ω Load)
F1
F2
Weight
Shipping
Net
Dimensions (D,W, H)
Operating Temperature

Recommendation for the Signal Lines

The signal lines transfer tone signals and verbal messages from the CommCenter 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 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 3 Product specifications (continued)
Audio Frequency Response, Balanced Signal Line
Audio Distortion from Cascade Input to Balanced Signal
Physical Specifications
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 300MB-SD CommCenter Series D1
67 dBA
-3 dB
-1 dB
-3 dB
-1 dB
0.2 %
Fuses
Type GMC-1, 1 A, 250 V
Type GMC-1/2, 1/2 A, 250 V
6.6 lb (3.0 kg)
5.5 lb (2.5 kg)
2.27 in x 9.41 in x 11.57 in
(57,7 mm x 239,0 mm x 293,9 mm)
32° F to 120° F (0° C to 49° C)