Product comparison guide: 
1-port video servers
  

AXIS 241S/SA Video Server AXIS 250S MPEG-2 Video Server Compression Motion JPEG, MPEG-4 MPEG-2 Max. video resolution (pixels) 704 x 480 (NTSC) 768 x 576 (PAL) 720 x 480 (NTSC) 720 x 576 (PAL) Max. frames per second per channel (NTSC/PAL)   - With    Motion JPEG 30/25 (4CIF)   - With MPEG-4 30/25 (2CIF)   - With MPEG-2   30/25 (4CIF) Video source 1 BNC composite Y/C video (SVHS) input* NTSC/PAL Auto sensing 1 BNC composite or Y/C video (SVHS) input NTSC/PAL Auto sensing Audio support (two-way audio only with AXIS 241SA model) (simplex stereo audio) Alarm inputs/outputs 4/4 4/1 Motion detection   Pan/Tilt/Zoom support ** uploadable PTZ drivers ** Security  Multi-level password, IP address filtering, HTTPS Multi-level password, IP address filtering, Ethernet networks 10/100BaseT 10/100BaseT Modem support     Serial connectors RS-232, RS-485/422 RS-232, RS-485/422 Blade version for use with AXIS Rack Solution  in large   installations (AXIS 241S only)

4-port video servers

	AXIS 240Q Video Server	AXIS 241Q/QA Video Server
Compression	Motion JPEG	Motion JPEG, MPEG-4
Max. video resolution	704 x 480 (NTSC) 768 x 576 (PAL)	704 x 480 (NTSC) 768 x 576 (PAL)
Max. frames per second per channel (NTSC/PAL)
- With Motion JPEG	6/5 (4CIF) per ch. using all 4 ch.	30/25 (CIF) per ch. using all 4 ch.; 30/25 (4CIF) using 1 ch.
- With MPEG-4		20/17 (CIF) per ch. using all 4 ch.; 30/25 (2CIF) using 1 ch.
Video source	4 BNC composite input NTSC/PAL, Auto sensing	4 BNC composite input NTSC/PAL, Auto sensing
Audio support		(two-way audio only with AXIS 241QA model)
Alarm input/relay output	4/4	4/4
Motion detection
Pan/Tilt/Zoom support	*	*
Security	Multi-level password, IP address filtering, HTTPS	Multi-level password, IP address filtering, HTTPS
Ethernet networks	10/100BaseT	10/100BaseT
Modem support
Serial connectors	RS-232, RS-485/422	RS-232, RS-485/422
Blade version for use with AXIS Rack Solution  in large installations		(AXIS 241Q only)