When operating T1/E1 devices in T1 mode, can the TCLK pin input frequency be 2.048MHz?
A11. T1/E1 devices (such as the DS2155, DS21458, and DS26528) provide a wide range of features aimed at easing device configuration. One of these features is the ability to use a single-frequency master clock (MCLK) in either T1 or E1 mode. Unfortunately, the device still requires that the external TCLK pin input be at the actual line frequency. In T1 mode, this means the input frequency on the TCLK pin must be 1.544MHz. However, there are some ways around this limitation, using either the elastic stores for rate conversion, or using the master clock PLL to source TCLK internally at 1.544MHz.
