Complete Solutions for Your Power, Voice and Data Needs
PVD Solutions provides product Sales, Design, Installation and Service for Power, Voice and Data Communication Networks. With many well-known and reputable clients, PVD Solutions is known across the state of Tennessee and respective professional industries for their superior level of service and ability to meet and exceed your expectations in a timely manner.
Family-Owned and Operated, Local Tennessee Business
Tim and Tom Hobrock of PVD Solutions make sure that each client receives the finest power, voice and data products based on their specific need and budget. Whether you are in need of a specific product or service, need assistance with installation or have a technology that needs repair, PVD Solutions can help. With years of technical experience and multiple professional certifications, PVD Solutions ensures that each project is completed in a timely manner, with the greatest level of customer service and dedication to quality.
PVD Solutions can assist your business with anything involving the 7 layers of the
BICSI - OSI pyramid model. (click on section to see details)
APPLICATION
Gateways
Interface between user & computer
API’s are used in this layer
Allows apps to use network
Handles network access
Messages sent between layers
Protocols: SNMP, FTP, TELNET, WWW, HTTP, SMB, NCP-TCP, TFTP, NFS, SMTP
PRESENTATION
Gateways
Translates data into understandable format for
transmission
Data compression and encryption
Determines data structure
Redirections works at this layer
Communicates through gateways and API’s
Services: TELNET, FTP; use TCP, TFTP, NFS, SNMP, SMTP use TCP
Protocols: JPEG, MIDI, MPEG, VISUAL, MUSICAND NCP
SESSION
Opening/closing session
Provides synchronization between communicating computers (nodes)
Sends messages between layers
Places checkpoints on data flow
Handles remote procedure calls; communicates through gateway
Services: TELNET, FTP use TCP, TFTP, NFT, SMMP, SMTP, use TCP
Protocols: NFS, SLQ, RPC
TRANSPORT
Packet Handling
Ensures error-free delivery
Repackages messages
Divides messages into smaller packets
Ensures proper sequencing
Data Flow Ctrl
Corrects faulty transmission
Acknowledges successful data receipt
Sliding window-segments of message fragments sent to this layer TCP/SPX oriented
Services: routers and brouters.
Protocols: TCP, UDP, SPX, NETBEUI (non routable)
NETWORK
Logical addressing
(s/w -> h/w resolved)
Message (packets) routing between hosts and networks Determines best routing
Moves info to correct address
Sends msgs and reports errors per packet delivery
Ppts HOST membership to local multicast routers (IGMP)
COMMS through gateway services
Routers & brouters
Services: routers/brouters
Protocols: IP, IPX, ICMP, ARP, RARP, OSPF; EGP, EIMP, NETBEUI, DCC, DECNET
DATALINK
Flow of data over single link between devices
Controls communication channel access
Organizes data in logical framers
ID’s specific computers on the network
Error detection added at this layer
Communicates between connection systems
Data forms sent between layers
Ethernet, tock ring; FDDI occurs here
Devices: brouters, routers, switches,
Protocols: HDLC, LLS Flow Control, SLSP & PPP
PHYSICAL
Data sent across physical media
Responsible for coding schemes
Defines cables, cards & physical aspects
Provides electrical/physical interfaces for a network
Specifies how signals are transmitted
Communicates through repeaters/hubs/switches/cables/ connectors/xmitters/receivers/multiplexers
no protocols
To learn more about PVD Solutions
and our products and services, please contact our team of design, sales and installation
experts today.