OVERVIEW 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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