Synchronous Residual Time Stamp

Synchronous Residual Time Stamp (SRTS, in German roughly "synchronous residual time stamp") is a process for synchronizing the transmitter and receiver in isochronous data transmission , even if there is no common clock signal . The SRTS procedure requires a reference clock in the transmitter and receiver. The transmitter determines the difference between the reference clock and the transmit clock and encodes this information in the time stamp . The receiver can thus determine the send clock.

With Asynchronous Transfer Mode transmission, the SRTS method is used to generate the transmission frequency from the CSI bit of an AAL-1 SAR ( Segmentation and Reassembly ) PDU header.

Assuming you can process the transmitter clock cycles in the time interval . Then cycles of the B-ISDN frequency can be run through in this time interval . This value deviates from a nominal value . The difference is transmitted encoded in the CSI bit ( Convergence Sublayer Indication ). From this the receiver can restore this and calculate the transmitter frequency with ${\ displaystyle s}$ ${\ displaystyle f_ {s}}$ ${\ displaystyle T}$ ${\ displaystyle n}$ ${\ displaystyle f_ {n}}$ ${\ displaystyle n}$ ${\ displaystyle n ^ {*}}$ ${\ displaystyle \ delta n = (nn ^ {*})}$ ${\ displaystyle n}$

${\ displaystyle f_ {s} = {\ frac {s} {n}} \ cdot f_ {n}}$

literature

Gerhard Haßlinger, Thomas Klein: Broadband ISDN and ATM networks transmission quality, Verlag Vieweg + Teubner, 1999, ISBN 978-3-519-06251-6 , pages 79 and 147 [1]
Carsten Roppel: Basics of digital communication technology, Verlag Hanser Verlag, 2006, ISBN 978-3-446-22857-3 , pages 361–362, [2]