Good morning! :)
Recently, at one of the courses, my students asked me the question - how to get rid of such a phenomenon as "slips" on the E1 links when connecting a Cisco gateway to another PBX or to PSTN? I would like to suggest a solution for everyone who faced a similar problem.
What is a "slip"? This is the term used for one of the errors related to the wrong clocking (desynchronization) of the E1 link. For the correct operation of the E1 stream, its exact clocking with the opposite side is necessary in order to know at what points in time the samples of certain timeslots are transmitted. If the clocking is wrong, the PBX can mistakenly take the sample bits of neighboring timeslots for the sample bits of this time slot, i.e., in other words, the PBX does not know at what point in time the sample bits of this timeslot are transmitted.
