Serial

From the moment that I’ve started working for a broadcaster I was immediately fascinated by the video routers, they basically are the core of a production centre the can switch, sync a reclock SDI signals it’s a very simple concept if you think switch a video from one port to others, but they hide a very complicated implementation because since you can switch any source to any destinations in the routing matrix the hardware must be no-blocking and you can’t do bandwidth oversubscription; in the meantime, you’ve to keep the vertical interval synched to avoid frames losses that cause flickering or other unexpected behaviours. ...

Setting up serial connection to VAXstation 4000/60: First made a serial cable, attention Vax use a DEC423 serial port designed for long distant terminal line: --------------- 1 - DTR (Data terminal ready) I I 2 - TxD (Transmit data) I 1 2 3 4 5 6 I 3 - GND (Signal ground) I I 4 - RxC (Receive common) I I 5 - RxD (Receive data) ---------I____I 6 - DSR (Data set ready) Pin 2 of the phone connector goes to Rx pin of the serial (3 of DB25 or 2 of DB9), pins 3 & 4 go to ground (7 of DB25 or 5 of DB9), and pin 5 goes to Tx pin (2 of DB25 or 3 of DB9). ...