An analog camera sends an analog video signal over coax cable to a DVR or an encoder, rather than producing a digital network stream. It is the legacy plant that IP cameras largely replaced: simple, cheap, and dependent on a back-end recorder to digitise and store its picture. The camera itself has no IP address, no on-board compression worth the name, and no ability to run analytics.
For decades analog was the default, and a huge installed base still exists. "HD-over-coax" standards (HD-TVI, HD-CVI, AHD) modernised it by carrying megapixel resolution over the same coax to a compatible recorder, so an existing analog run can be upgraded in image quality without pulling new cable. An encoder (video server) is the other bridge: it digitises analog cameras onto an IP network so a VMS can record them alongside IP cameras.
The limits are why new systems rarely start here: lower resolution than modern IP cameras, one home-run cable per camera, no edge intelligence, and a separate power supply at each camera. Analog makes sense to preserve an existing investment; for a green-field deployment, IP cameras with PoE and a VMS are the stronger foundation.
The handbook · 7 volumes
Fora Soft Video Engineering Handbook
An analog camera still runs in many sites, and keeping it means picking encoders that digitise its signal without wasting storage or losing detail. We wrote seven volumes covering the whole video stack, and for analog camera plants start with Volume 1 on encoding: pixels and colour, H.264 and HEVC compression, bitrate control and quality metrics. Written by Nikolay Sapunov, CEO at Fora Soft.
Moving an analog camera estate to IP without replacing every camera at once?
We will survey your current plant and deliver a migration plan with encoder choice, bitrate targets and the order to replace analog cameras with IP. 250+ video products shipped since 2005.
