公开(公告)号：WO9115907A3

公开(公告)日：1991-12-12

申请号：PCT/CH9100083

申请日：1991-04-08

Applicant: ASCOM TECH AG

Inventor： VOGEL PAUL ,  MARTINSON THOMAS

IPC: H04B10/00 ,  H04L7/00 ,  H04L7/027 ,  H04L7/033 ,  H04L7/04 ,  H04L7/08 ,  H04L7/10

CPC classification number: H04L7/0075 ,  H04L7/027 ,  H04L7/0332 ,  H04L7/041 ,  H04L7/042 ,  H04L7/10

Abstract: The bit and frame synchronizing unit (51) described is designed to synchronize an access node with the bit stream passing along a fibre-optic cable. The unit (51) has an electrically controlled optical switch (57) used as a light switch. It also has a sequence indicator (75) for electrical control of the switch (57), an impulse generator (72), an electro-optical converter (60), an electrical integrator (63), an adjustment and weighting unit (66) and a control unit (69). The unit (51) also has a coarse-adjustment device (48). An optical bit pattern (BM) appears periodically at the input (53), and at the control input (44) an associated equivalent electrical reference pattern (VM). The size of the resultant electrical voltage pulse (U) at the output (64) of the integrator (63) is, in an approximately synchronous-running state, a measure of the phase difference between the two. In the case of perfect synchronization, a sharp impulse peak occurs. The unit (51) is intended for the simultaneous synchronization of bit and frame phase.