| 摘要 |
1. A synchronization method for adapting data transmissions between a plurality of low-speed data terminals (DTEs 13, 18) and one high-speed transmission channel (32), characterized in that it applies to a network wherein said low-speed terminals include external clocks (CKs) and are connected to said high-speed channel through a modem (38) provided with an internal clock of the type comprising a phase-locked oscillator (PLO), said terminals being connected to the modem through channels that are selectively activated according to predetermined configurations and said modem transmitting a group of bits at each signaling instant, said method including the steps of : - selecting a time slot (W) of predetermined width to be centered on the signaling instants, - selecting one of said external clocks as a reference for adjusting the PLO of the modem, - determining whether a transition of the signal supplied by the selected external clock occurs within each time slot and adjusting the PLO accordingly, with the adjustment being either : . a fast adjustment made by increasing the output frequency of the PLO during a given time interval if said transition fails to occur within said time slot, or . a slow adjustment if said transition does occur, said slow adjustment being made solely within said time slot. |
