O
VERVIEW
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)
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