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DX-120 Installation and Maintenance Manual OVERVIEW
ISDN Card (T1/PRI Module) Details
The ISDN Card (T1/PRI Module) allows for expansion of the DX-120 system CO line interface to a capacity
maximum of 23 Digital CO line ports.
ISDN Card (T1/PRI Module)
• 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 T1 card’s
synchronization.
• Control data interface • Compatible with SPI (Serial Peripheral Interface) bus timing.
ISDN Card (T1/PRI Module) Details
Capacity: One (1) T1(1.544Mbps, 24channels) interface
Network interface mode ISDN (T1/PRI) Interface
Network connector RJ-45
LED indicator ISDN (T1/PRI) Card has 9 LEDs on the PCB which indicate alarms of
T1 trunk,
in-use status, and synchronous clock enable status.
ISDN Card (T1/PRI Module) Details (continued on next page)
T1 Card (T1 Module) Details (continued)
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