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3.3. PRI Board
3.3.1. Board Description
The PRI board contains an one or two ISDN interfaces and PCM bus timing circuits. PRI 1
interface is designed as internal (on this port is activated LCR function), PRI 2 port is designed
as external (all calls from the port will be routed to PRI 1 port). The interface can work in the
MASTER or SLAVE mod (via BLUESTAR program you can set mode of PRI 1 port, PRI 2 port
has always opposite mode!). The output can be configured as TERMINAL or NETWORK by
jumpers (switching of wires – for software switch you have to use BLUESTAR program!). These
jumpers HAVE TO be set same as PRI configuration – two NT and TE modes will cause
malfunction of PRI board or backup connection* ! 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.
* the PRI board contains four switches (can be deactivated by jumpers) which makes
hardware connection between PRI 1 and PRI 2 in case that BLUESTAR is switched off or has
some software problem.
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
