Specifications

OVERVIEW DX-120 Installation and Maintenance Manual
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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. ISDN (T1/PRI) Working = Steady Green
• D7 Clock Mode Indicator, Master Mode = Dark
Slave Mode = Green lit
• D8 ISDN (T1/PRI) Indicator ISDN (T1/PRI) = Green lit
• D9 Heart Beat Normal = Flashing
Abnormal = Dark or Steady Green lit
• D10 Signaling Synchronization indicator Synchronous = Green lit
Non-Synchronous = Dark
Clock source On-board crystal and can be set as master or slave to synchronize with
PSTN, depending upon the networking requirement.
Backplane connector 15-pin
Backplane interface covers the following:
• Power feeding 5 VDC
• PCM highway System will provide an 8KHz frame signal for ISDN (T1/PRI) card’s
synchronization.
• Control data interface Compatible with SPI (Serial Peripheral Interface) bus timing.
ISDN Card (T1/PRI Module) Details (continued)