User manual
 FIRMWARE VERSION 1.0.14.1   HT503 USER MANUAL  Page 15 of 64  
HARDWARE SPECIFICATION 
The table below lists the hardware specification of HT503.  
TABLE 4: HT503 HARDWARE SPECIFICATION 
LAN interface 
1xRJ45 10/100 Mbps Port 
WAN interface 
1xRJ45 10/100 Mbps Port 
FXS telephone port 
1 x FXS (RJ11) 
FXO  telephone  port 
(PSTN Port) 
1x PSTN pass-through and life line port 
LED 
Power, WAN, LAN, PHONE, and LINE (Green) 
Universal Switching 
Power Adaptor 
Input: 100–240 VAC, 50-60 Hz 
Output: 12VDC, 0.5A, UL certified 
Dimension 
25mm x 115mm x 75mm (when laying flat); 
115mm x 25mm x 75mm (standing up) 
Weight 
Approximately 0.6lbs (0.3kg) 
Temperature 
Operational: 32° - 104°F or 5° – 45°C 
Storage: 10°–130°F 
Humidity 
10% - 90% 
(non-condensing) 
Compliance 










