Brother International 9870 Service Manual - Page 144

Selector No. 1 | 3 4 | 6 7 8 WSW19 (Transmission speed setting) Function First transmission speed choice for fallback Last transmission speed choice for fallback V. 34 mode V. 17 mode Setting and Specifications No. 1 2 3 No. 4 5 6 000 : 001 : 010 : 011 : 100 : 101 : 110 : 111 : 0: Permitted 0: Permitted 2,400 bps 4,800 bps 7,200 bps 9,600 bps 12,000 bps 14,400 bps 1: Prohibited 1: Prohibited l Selectors 1 through 6: First and last choices of transmission speed for fallback These selectors are used to set the modem speed range. With the first transmission speed choice specified by selectors 1 through 3, the machine attempts to establish the transmission link via the modem. If the establishment fails, the machine automatically steps down to the next highest speed and attempts to establish the transmission link again. The machine repeats this sequence while stepping down the transmission speed to the last choice specified by selectors 4 through 6. If the modem always falls back to a low transmission speed (e.g., 4,800 bps), set the first transmission speed choice to the lower one (e.g., modify it from 12,000 bps to 7,200 bps) in order to deactivate the high-speed modem function and reduce the training time for shorter transmission time. Generally, to save the transmission time, set the last transmission speed choice to a higher one. l Selector 7: V. 34 mode This selector determines whether or not the machine communicates with the remote station in the V. 34 mode when that station supports the V. 34 mode. V - 32