For larger synchronous networks with one master system (with SASE) and peripheral systems connected to local exchanges by BA, check if the small buffer of the BA suffices for the jitter and drift of all possible networking situations. If in doubt, system synchronization from the local exchange is preferable. In this case, the connection, which in the event of error can show bit slip, drifts from the perimeter into the private network. The BA, however, remains slip-free in normal operation because the buffers of the internal PMA interfaces are sufficient in size.