Delay compensation for variable cable length
First Claim
1. A method comprising:
- receiving, at a time distribution device, a time signal;
generating a time reference based on the received time signal;
overcompensating the time reference for a hardware delay of the time distribution device and, for a maximum cable length delay, to produce an overcompensated time reference;
for a first end device, adding a first delay to the overcompensated time reference based on a difference between the maximum cable length delay and a delay related to a cable length between the time distribution device and the first end device, to create a first end device time reference;
for a second end device, adding a second delay to the overcompensated time reference based on a difference between the maximum cable length delay and a delay related to a cable length between the time distribution device and the second end device, to create a second end device time reference;
transmitting the first end device time reference to the first end device, and,transmitting the second end device time reference to the second end device.
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Accused Products
Abstract
The present application discloses a time distribution device capable of providing a synchronized time signal to a plurality of end devices connected to the time distribution device with cables of various lengths. The time distribution device may receive a time signal, generate a time reference based on the received time signal, compensate the time reference for hardware delay, and overcompensate the time reference for a delay caused by a maximum cable length. Prior to being distributed to various end devices, each being connected with the time distribution device by cables of varying length, this overcompensated time reference may then be delayed by an amount based on the cable length connecting each respective end device such that the arrival of each of the synchronized time references at the various end devices is synchronized.
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Citations
18 Claims
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1. A method comprising:
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receiving, at a time distribution device, a time signal; generating a time reference based on the received time signal; overcompensating the time reference for a hardware delay of the time distribution device and, for a maximum cable length delay, to produce an overcompensated time reference; for a first end device, adding a first delay to the overcompensated time reference based on a difference between the maximum cable length delay and a delay related to a cable length between the time distribution device and the first end device, to create a first end device time reference; for a second end device, adding a second delay to the overcompensated time reference based on a difference between the maximum cable length delay and a delay related to a cable length between the time distribution device and the second end device, to create a second end device time reference; transmitting the first end device time reference to the first end device, and, transmitting the second end device time reference to the second end device. - View Dependent Claims (3, 4, 6, 7, 8, 9)
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- 2. The method of 1, further comprising receiving the cable length between the time distribution device and the first end device and the cable length between the time distribution device and the second end device.
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10. A time distribution device for receiving and distributing a synchronized time reference to a plurality of end devices, comprising:
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a receiver configured to receive a time signal; a time reference generator configured to generate a time reference based on the time signal; overcompensate the time reference for a hardware delay of the time distribution device and, for a maximum cable length delay to produce an overcompensated time reference; and for a first end device, add a first delay to the overcompensated time reference based on a difference between the maximum cable length delay and a delay related to a cable length between the time distribution device and the first end device to create a first end device time reference; for a second end device, add a second delay to the overcompensated time reference based on a difference between the maximum cable length delay and a delay related to a cable length between the time distribution device and the second end device to create a second end device time reference; and a transmitter configured to transmit the first end device time reference to the first end device and the second end device time reference to the second end device. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification