PoE stands for Power over Ethernet.  It is a technology for supplying power or electricity to networked devices installed in locations where power is not readily available.  The technology allows electricity to be supplied on the same Ethernet cable that supplies data.  The technology was first ratified by the Institute of Electrical and Electronic Engineering in the USA in 2003 as a standard.

Keywords:

PoE Plus
PSE and PD
Mid Span & End Span
Alternative A & B
Injector & Splitter


Q&A:

• How to supply power from a PoE switch?
• Can we supply power from a non PoE switch?
• Can we supply power to a mix of PoE and non PoE networked devices?
• Is there a limit on the distance of PoE cable?
• Will PoE kill a non-PoE device?

IPVS stands for IP Video Surveillance.  IP stands for Internet Protocol (see Keyword below for more explanation).  Video Survellance refers to remote monitoring of physical areas by cameras.  IP Video Surveillance is a scheme of arrangement of cameras, connections, displaying and recording equipment.  The term has been loosely used in the industry.

Keywords:

• CCTV
• Security Cameras
• Video Surveillance
• Analogue, Digital & IP Technologies
• VC, DV, NV Recorders
• CCD, CMOS Sensors
• Interlaced and Progressive Scanning
• PTZ Control
• Day & Night Vision, Infra-red Vision
• CIF, D1 & Mega-pixel Frame Size
• MJPEG, MPEG4 and H.264 Compression
• Uni-cast, Broadcast & Multi-cast

• What benefit does IP Video Surveillance provide over analogue-based equipment?
• Why should we use megapixel cameras instead of D1?
• Would MPEG-4 provide higher-clarity images than M-JPEG would?
• Would NVR have the same image degradation problem as some DVR?
• Will a good camera be able to capture images in dim light?

PoE stands for Power over Ethernet.  It is a technology for supplying power or electricity to networked devices installed in locations where power is not readily available.  The technology allows electricity to be supplied on the same Ethernet cable that supplies data.  The technology was first ratified by the Institute of Electrical and Electronic Engineering in the USA in 2003 as a standard.

Keywords:

PoE Plus
PSE and PD
Mid Span & End Span
Alternative A & B
Injector & Splitter


Q&A:

• How to supply power from a PoE switch?
• Can we supply power from a non PoE switch?
• Can we supply power to a mix of PoE and non PoE networked devices?
• Is there a limit on the distance of PoE cable?
• Will PoE kill a non-PoE device?