Method and apparatus of multiplexing and demultiplexing communication signals
View Patent ↗A method and apparatus for multiplexing and demultiplexing communication signals are described herein. In one embodiment, an apparatus includes first sample logic to sample a plurality of communication signals each including a clock component and a non-clock component. The first sample logic includes a first multiplexer to receive the clock components and a second multiplexer to receive the non-clock components. In addition, a first counter is coupled to a control input of the first multiplexer and the second multiplexer. A capture unit including a non-clock component storage element coupled to an output of the second multiplexer and edge detection logic is coupled to an output of the first multiplexer to detect a transition of a clock component and coupled to a control input of the non-clock component storage element.
1. An apparatus comprising:
a first sample logic to sample a plurality of communication signals from a plurality of line interface units, where each of the plurality of communication signals includes a clock component and a non-clock component, said plurality of communication signals including a plurality of communication signal groups, said first sample logic including a first multiplexer to receive said clock components and a separate second multiplexer to receive said non-clock components;
a first counter coupled to a control input of said first multiplexer and said separate second multiplexer;
a capture unit including,
a non-clock component storage element coupled to an output of said second multiplexer, and
edge detection logic coupled to an output of said first multiplexer to detect a transition of a clock component and coupled to a control input of said non-clock component storage element; and
a second sampling logic coupled to said capture unit to sample a selected group of communication signals of said plurality of groups.
2. The apparatus of claim 1 wherein said first sample logic is implemented within a programmable logic device and said first counter and said capture unit are implemented within an application specific integrated circuit.
3. The apparatus of claim 2 wherein said application specific integrated circuit is operated at a first clock signal frequency and said programmable logic device is operated at a second clock signal frequency and further wherein said first clock signal frequency is higher than said second clock signal frequency.
4. The apparatus of claim 1 wherein said plurality of communication signals comprises a plurality of T1 communication signals.
5. The apparatus of claim 4 wherein said clock component comprises an extracted T1 clock signal.
6. The apparatus of claim 4 wherein said non-clock component comprises an extracted T1 clock signal.
7. The apparatus of claim 1 wherein said first counter is coupled to a control input of said edge detection logic.
8. The apparatus of claim 7 wherein said first counter is coupled to said control input of said edge detection logic via a delay element.
9. The apparatus of claim 1 wherein said capture unit further includes a valid identifier storage element coupled to an output of said edge detection logic.
10. The apparatus of claim 9 further comprising a read circuit coupled to an output of said valid identifier storage element and an output of said non-clock component storage element.
11. The apparatus of claim 10 further comprising a deframer coupled to an output of said read circuit.
12. The apparatus of claim 11 further comprising a jitter attenuation unit including a jitter buffer coupled to an output of said deframer.
13. The apparatus of claim 12 wherein said jitter buffer comprises a jitter buffer to compensate for sampling jitter and external clock jitter.
14. The apparatus of claim 12 wherein said jitter buffer includes a control input coupled to said output of said first multiplexer.
15. The apparatus of claim 14 wherein said output of said first multiplex comprises a sampled, extracted clock signal.