Osi (Open Systems Interconnection) Reference Model; Mac Address (Media Access Control Address) - Furuno Felcom 250 Service Manual

OSI (Open Systems Interconnection) Reference Model

OIS reference model is a model where the communication functions expected for a
computer are divided into 7-layer structure.
Layer
7. Application layer
(Presentation layer)
6. Presentation layer
(Presentation layer)
5. Session layer
(Session layer)
4. Transport layer
(Transport layer)
3. Network layer
Network layer)
2. Data link layer
(Data link layer)
1. Physical layer
(Physical layer)

MAC Address (Media Access Control address)

MAC address is a physical address allocated for the hardware of the network
equipments such as LAN cards which are being set for the purpose of identifying each
node within the network.
When compared to the OSI reference model, it is equivalent with the media access
control addresses for the 2nd layer (data link layer).
MAC address is described using octet description 48 bit codes such as;
"04-A3-43-5F-43-23".
Among this MAC address, the first 24 bit part "04-A3-43" is the vendor ID part, the
next 8 bit part "5F" if the model ID, and the last 16 bit part "43-23" is the serial ID in
general.
Description
Specific communication services
(such as file or e-mail forwarding,
remote database accessing, etc.)
are provided. Communication
services such as HTTP or FTP, etc.
Data expression method (for
example, converting a EBCDIC
coded text file to an ASCII coded
file)
The procedure from starting until
finishing the communication
between communication programs
(when connection is interrupted,
restoration will be attempted)
Communication management
across the entire network (error
correction, control upon resending,
etc.)
Selecting the communication path
within the network (routing). Data
relay
Delivery of signals between the
communication equipments
connected directly (adjacently)
Physical connection. Specifications
and other information for the
number of connector pins and for
the connector formats. Converting
electrical signals between copper
cables and optical fibers.
AP4-7
Appendix 4. Abbreviations
Protocol reference
example
HTTP, DHCP, SMTP,
SNMP, FTP, Telnet, AFP,
X.500
SMTP, SNMP, FTP, Telnet,
AFP
SSL, NetBIOS, NWLink,
DSI, ADSP, ZIP, ASP, PAP
TCP, UDP, SPX, NetBEUI,
RTMP, AURP, NBP, ATP,
AEP
IP, ARP, RARP, ICMP, IPX,
NetBEUI, DDP, AARP
Ethernet, Token ring,
ARCNET, PPP,
Frame relay
RS-232, RS-422,
Telephone wire, UTP,
HUB, Repeater, Radio,
Optical fiber Cable