2N Telekomunikace ATEUS STARGATE, Руководство пользователя, Страница: 14 / 67

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3.3. PRI Board
3.3.1. Board Description
The PRI board contains an ISDN interface and PCM bus timing circuits. The interface can
work in the MASTER or SLAVE mode. The output can be configured as TERMINAL or
NETWORK by jumpers. The board is designed on a 4-layer PCB of the size of 160x100mm. A
PRIMARY ISDN interface and 5 board status indicators are located on the front panel.
PWR LED
Indicates board supply
Lights on Switched on
Lights off Switched off
INIT LED
Indicates board initialization or error status
Blinks Indicates the initialization of the board
Lights on (still) Board initialization failure
LAY3 LED
indicates layer 3 status
Lights on active call or channel restart
Lights off No call through PRI ISDN
LAY2 LED
indicates layer 2 status
Lights on Established
Lights off Not established
Blinking Not established
LAY1 LED
indicates layer 1 status
Lights on synchronized
Lights off Not synchronized (disconnected)
Blinking slowly No frame synchronization
Blinking quickly No multi-frame synchronization