Patent ID: 8743715
Filing Date: 2014-06-03
Classification: H04J,H04L,H04Q

Abstract:
1. A physical layer switch, comprising: a first clock-and-data-recovery (CDR) circuit; a second CDR circuit; a cross-bar switch to couple the first CDR circuit and the second CDR circuit, to create a dedicated communication path between the first CDR circuit and the second CDR circuit; a first test pattern generation circuit electrically coupled with the first CDR circuit and configured to generate a test pattern and transmit the test pattern from the first CDR circuit to the second CDR circuit via the cross-bar switch; and a first test pattern checking circuit electrically coupled with the second CDR circuit, to verify the test pattern received at the second CDR circuit, wherein: the first CDR circuit comprises configuration logic to specify a value of an adjustable parameter of the first CDR circuit; and the physical layer switch further comprises control circuitry electrically coupled to the first test pattern checking circuit and the first CDR circuit, to command the first CDR circuit to specify the value of the adjustable parameter.