PXB4219 Datasheet, PDF (279/290 Pages) Infineon Technologies AG – IWE8 Interworking Element for 8 E1/T1 Lines

RTS values are generated as follows:
T
PXB4219 / PXB4220 / PXB4221
Appendix
f_s
Counter A
divided by N
Latch
RTS
f_n
Figure 77
—1x
f_nx
P-bit
counter C_t
T1817640-92
Generation of Residual Time Stamp (RTS) (Fig.6/ I.363.1)
The transformation of RTS values in a clock is not specified in the SRTS specifications.
Basically (the implementation is slightly different), the ICRC calculates another RTS
value based on the transmit clock. The difference between received RTS values and
locally calculated RTS values, drives a DCO. This solution can be described as a PLL
with an unusual phase comparator.
Data Sheet
279
2002-05-06