O
VERVIEW
DX-120 Installation and Maintenance Manual
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T1 Card (T1 Module) Details
The T1 Card (T1 Module) allows for expansion of the DX-120 system CO line interface to a capacity maximum of
24 digital CO line ports.
T1 Module
T1 Card (T1 Module) Details
Capacity:
• One (1) T1(1.544Mbps, 24channels) interface
Network interface mode
• T1-Interface
Network connector
• RJ-45
LED indicator
• T1 Card has 9 LEDs on the PCB which indicate alarms of T1 trunk,
in-use status, and synchronous clock enable status.
LED # Function
•
D2
Yellow Alarm Indicator
• Normal=Dark
• Alarm = Red lit
•
D3
AIS Alarm Indicator • Normal
=Dark
• Alarm = Red lit
•
D4
Loss of Frame Alarm Indicator
• Normal = Dark
• Alarm = Red lit
•
D5
No Signal Alarm Indicator
• Normal = Dark
• Alarm = Red lit
•
D6
PRI Link Channel Sync.
• For T1 card = Always Dark
•
D7
Clock Mode Indicator,
• Master Mode = Dark
• Slave Mode = Green lit
•
D8
T1/E1 Indicator
• T1 = Green lit
• E1= Dark
•
D9
Heart Beat
• Normal = Flashing
• Abnormal = Dark or Steady Green lit
T1 Card (T1 Module) Details (continued on next page)
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