Nortel QPC757 Installation Manual page 117

NTD12 Dual-port DTI/PRI card description and installation
LBK LEDs
Two green LEDs which indicate if remote loopback test is being performed
on trunk port 0 or trunk port 1. The loopback indication is active when the
digital trunk is in remote loopback mode (T1 signals received from the far end
are regenerated and transmitted to the far end.) Normal call processing is
inhibited during remote loopback test.
DCH LED
Dual color red/green LED which indicates that the on-board DDCH is present
but disabled (red), or is present and enabled (green). If a DDCH is not
configured on the DDP card, this lamp will not be lit.
Port 0 Clk Connectors
Two RJ11 connectors for connecting:
— Digital trunk port 0 recovered clock to primary or secondary reference
source on clock controller card 0.
— Digital trunk port 0 recovered clock to primary or secondary reference
source on clock controller card 1.
Port 1 Clk Connectors
Two RJ11 connectors for connecting:
— Digital trunk port 1 recovered clock to primary or secondary reference
source on clock controller card 0.
— Digital trunk port 1 recovered clock to primary or secondary reference
source on clock controller card 1.
Connector J5 (TRK)
A 9 pin D-Type connector used to connect:
— Digital trunk port 0 receive and transmit Tip / Ring pairs.
— Digital trunk port 1 receive and transmit Tip / Ring pairs.
Connector J6 (DCH)
A 26 pin D-type connector, used to connect the DDP card to MSDL or
QPC757 external D-channel handlers.
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ISDN PRI Installation