Nortel Networks 553-3001-211 manual LBK LEDs, Unit 0 Clk Connectors, Unit 1 Clk Connectors

NT5D97 Dual-port DTI2/PRI2 card Page 313 of 894

LBK LEDs

Two yellow LEDs indicate if a 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. Normal call processing is inhibited during the remote loopback test.

DCH LED

When the dual colored LED is red, it indicates the on-board DDCH is present but disabled. When the dual colored LED is green, it indicates the on-board DDCH is present and enabled. If a DDCH is not configured on the DDP2 card, this lamp is not lit.

Unit 0 Clk Connectors

Two RJ11 connectors for connecting:

•Digital trunk unit 0 recovered clock to primary or secondary reference source on clock controller card 0.

•Digital trunk unit 0 recovered clock to primary or secondary reference source on clock controller card 1.

Unit 1 Clk Connectors

Two RJ11 connectors for connecting:

•Digital trunk unit 1 recovered clock to primary or secondary reference source on clock controller card 0.

•Digital trunk unit 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 unit 0 receive and transmit Tip / Ring pairs.

•Digital trunk unit 1 receive and transmit Tip / Ring pairs.

Connector J6 (DCH)

A 26 pin D-type connector is used to connect the DDP2 card to the external MSDL or D-channel handler.

Circuit Card Description and Installation