Termination for a line card in a telecommunication system
View Patent ↗A system of terminating signals in a telecommunication system is disclosed. In one embodiment a line card comprises functional circuitry, line card connector contacts and a termination resistor. The functional circuitry is used to interface first type ports with second type ports. The line card connector contacts are adapted to be selectively coupled to a backplane of a chassis. The termination resistor is adapted to terminate signal lines when a jumper is coupled across select line card contacts.
1. A method of terminating signal lines, the method comprising:
coupling signal lines to a chassis;
when a backplane of the chassis includes a backplane termination resistor, terminating signals with the backplane termination resistor, and
when the backplane of the chassis does not include a backplane termination resistor, terminating the signals with a line card termination resistor contained on a line card.
2. The method of claim 1 , where the signal lines are DSX-1 lines and the signals are DSX-1 signals.
3. The method of claim 2 , wherein terminating the DSX-1 signals with the line card termination resistor on the line card further comprises:
coupling a jumper across select electrical card connector contacts, when the line card is electrically coupled to the backplane of the chassis.
4. The method of claim 2 , wherein terminating the DSX-1 signals with the line card termination resistor on the line card further comprises:
coupling a jumper across pins B 11 and C 10 of the line card.
5. The method of claim 2 , wherein coupling the DSX-1 lines to the chassis further comprises:
coupling a first DSX-1 line to pin C 8 of the line card, and
coupling a second DSX-1 line to pin C 9 of the line card.
6. The method of claim 5 wherein terminating the DSX-1 signals with a line card termination resistor contained on a line card further comprises:
coupling a first line card connector contact to pin C 8 ;
coupling the line card termination resistor between pin C 9 and a second line card connector contact; and
coupling a jumper across the first and second line card connector contacts.
7. The method of claim 6 , wherein the first line card connector is pin C 10 of the line card and the second line card connector contact is pin B 11 of the line card.
8. A method of interfacing DSX-1 or DSL signals, the method comprising:
coupling the DSX-1 lines to a backplane of a chassis;
coupling the DSL lines to the backplane of the chassis;
when a backplane includes a backplane termination resistor, terminating DSX-1 signals with the back plane termination resistor;
when the backplane of the chassis does not include a backplane termination resistor, terminating the DSX-1 signals with a line card termination resistor contained on a line card; and
interfacing the DSL or DSX-1 signals with the line card.
9. The method of claim 8 , wherein terminating the DSX-1 signals with the line card termination resistor on the line card further comprises:
coupling a jumper across select electrical card connector contacts, when the line card is electrically coupled to the backplane of the chassis.
10. The method of claim 8 , wherein terminating the DSX-1 signals with the line card termination resistor on the line card further comprises:
coupling a jumper across pins B 11 and C 10 pin of the line card.