Abstract: A USB controller includes: a USB interface that receives an isochronous timestamp packet (ITP) from a host device that includes a current time value from the host device and a delay value associated with each hub through which the ITP passed; controller hardware that initiates a counter, sends a link delay measurement (LDM) link management packet (LMP) request to a nearest upstream hub, stores a first timestamp that corresponds to when the LDM LMP request was sent, receives an LDM LMP response from the nearest upstream hub, and stores a second timestamp that corresponds to when the LDM LMP response was received; and controller software that calculates a link delay between the USB controller and the nearest upstream hub based on the first and second timestamps and delay information included in the LDM LMP response, and adjusts the counter value based on the calculated link delay.

Abstract: A USB controller includes: a USB interface that receives an isochronous timestamp packet (ITP) from a host device that includes a current time value from the host device and a delay value associated with each hub through which the ITP passed; controller hardware that initiates a counter, sends a link delay measurement (LDM) link management packet (LMP) request to a nearest upstream hub, stores a first timestamp that corresponds to when the LDM LMP request was sent, receives an LDM LMP response from the nearest upstream hub, and stores a second timestamp that corresponds to when the LDM LMP response was received; and controller software that calculates a link delay between the USB controller and the nearest upstream hub based on the first and second timestamps and delay information included in the LDM LMP response, and adjusts the counter value based on the calculated link delay.

Abstract: A method is described comprising associating (104) a first identifier with a print job, holding (106) the print job without it printing, and releasing (108) the print job to print when a device is activated to provide a second identifier and the second identifier is related to the first identifier. An apparatus is also described comprising a receiver (18) of a print job which is associated with a first identifier, and an interface to a device (22) which provides a second identifier. The receiver (18) is configured to initially hold the print job without it printing, and the receiver (18) is configured to cause the print job to be printed by a printer (20) when the device (22) is connected to the interface, the second identifier is obtained from the device (22) and the second identifier is related to the first identifier.