例句與造句

1. At the physical layer the network backbone initially comprised a set of dedicated telephone circuits connected via pairs of synchronous modems with speed varying from 1.2kbit / s to 9.6kbit / s.
2. Historically, voice-band synchronous modems such as the Bell 201, 208, and 209 and the CCITT V . 26, V . 27, V . 29, V . 32, and V . 34 used PSK.
3. Through most of the 1980s the entire traffic between the European backbone and the United States BITNET backbone was carried over a single 4.8kbit / s circuit and afterward, for quite some time, over a single 9.6kbit / s circuit using a pair of IBM synchronous modems.
4. On the other hand, if you had a big-ass synchronous modem, you could send and receive blocks of 400 or 800 characters at 4800 baud, true 8 bits per character minus some block-level overhead ( but much less than the 20 % of async " interactive " ).
5. For example, code 22, " synchronous idle " ( SYN ), was originally sent by synchronous modems ( which have to send data constantly ) when there was no actual data to send . ( Modern systems typically use a start bit to announce the beginning of a transmitted word & mdash; this is a feature of " asynchronous " communication . " Synchronous " communication links were more often seen with mainframes, where they were typically run over corporate leased lines to connect a mainframe to another mainframe or perhaps a minicomputer .)
6. It's difficult to find synchronous modem in a sentence. 用synchronous modem造句挺難的