On Thu, Dec 29, 2016 at 5:32 AM, salar007 <ali.salar007(a)gmail.com> wrote: more need Question 1: If you are asking if a osmocom-TRX can increase its capacity to multiple handsets by extending the timeslot. I dont think that it is possible (I may be wrong), the handsets are already working beyond their intended capacity in osmocom-TRX. Question 2: Every incomming TDMA frame generates an interrupt function in sync.c called l1_sync(void). The dsp_api structure is used to communicate with dsp from layer1. If the DSP has encountered an error it puts the error code in dsp_api.ndb->d_error_status. Currenlty dsp errors are printed to the users but generally ignored look at the following code-sample from inside of l1_sync: if (dsp_api.ndb->d_error_status) { printf("DSP Error Status: %u\n", dsp_api.ndb->d_error_status); dsp_api.ndb->d_error_status = 0; } This means that regardless of what d_error_status it will be set to 0 and the program will continue as normal, you may consider this message a debug warning. The file src/target/firmware/include/calypso/dsp_api.h details the different error codes available and their meaning.