IEP and networking Flashcards
what is a network
- two or more connected computers or devices that can exchange data
- can be wired or wireless
examples of devices in diagnostic imaging
- CR reader - this is essentially desktop
- scanners - these are desktop computers
how are devices connected
wires
type of wired connection
- ethernet
- fibre optic - uses light/ electrical signals
- coaxial
what is ethernet cabling
makes use of twisted pair cable + RJ45 connectors
- cables shielded to reduce interference
what is co-axial cabling
- has only two conducting elements; inner core and outer shield
- outer kept at ground (0v)
- inner carries the signal
- speeds up to 10Mb/s
what is co-axial cabling
- has only two conducting elements; inner core and outer shield
- outer kept at ground (0v)
- inner carries the signal
- speeds up to 10Mb/s
what are fibre optic cables used for
- used mainly for longer stretches where data transferred between sites/ servers
how is data sent in fibre optic cables
- sent as digitized light waves - internally reflected in hallway of cable
- cladding is mirrored so light bounces off + continues
which cable type is the most secure and why
- fibre optic
- transfers data via light which are harder to intercept than electrical signals
how does a network work
- uses an IP (internet protocol) address
- either static or dynamic
what type of IP addresses do hospitals use
- static
what are IP’s controlled by in a dynamic network
- central DHCP (dynamic host protocol server
what do routers and switches and hubs help control
- control flow of data through network to ensure data goes where it should
what does the server of a static IP address control
- which device is sending information
- which device is receiving information
- device access to internet
- control of data flow
- can also act as storage devices
what is the UK’s largest high-speed wireless network
LTE (long term evolution) protocol
how to access a wired network
- need to remotely access it through internet
- can be directly connected to network
wireless networks advantages
- support devices without wired network controllers
- great in places where security less important
wired speeds
speeds up to 31Tb/s (fibre optic) or 10Gb/s (Cu wire)
wireless speeds
speeds up to 280Mb/s
compare wired and wireless connections
wired - security very good
wireless - open to attack by devices visiting site
wired - controllers cheap + pre-fitted by older devices
wireless - controllers more expensive but now prefitted to many devices
wired more reliable
wired - no connection available on many mobile devices
wireless - some mobile devices ONLY have wireless access
wired - less easy to add devices
wireless - easy to add devices and devices remain portable
IEP
image exchange portal
when are IEPs used
widely used system for secure transfer of DICOM images between hospitals and other health care providers
how do IEP’s work
images can be requested or sent
what is an IEP
- run by PACS provider sectra
IEP alternatives
- mailing/ couriering CDs/DVDs
- USB media
IEP vs CDs
IEP - data cannot be misplaced
CDs - can be lost easily
IEP - when arrive automatically added to local PACS
CDs - images difficult to add to PACS
IEP - vulnerable to hacking
CDs - can be isolated from networks = secure
IEP - can only be sent to other sites in IEP community
CDs - can be sent anywhere
IEP - images can be sent very quickly in emergency
CDs - need to be physically moved
how to convert MB to Mbits
multiply by 8
what type of speed is rarely achieved on a network
100Mbits/s
