1. Physical layer Interfacing
1. Physical layer Interfacing
- EIA-232 (AKA RS-232) is a mess! DTE = Data terminal equipment. Computers and terminals are usually DTE (but sometime not!)
- DCE = data circuit-terminating equipment (e.g. modem)
- DCE xmits and rcvs bits in the channel, it also communicates with the DTE. A priori knowledge of the DCE rcvr-xmitter pair is needed. See fig 4.8