Thursday, August 20, 2009

Systems Summary 1

In this table you can compare the different packet based wireless WAN systems.

The first commercially available Mobitex services offered a bitrate of 1.2 kbps. This was available in 1986 - a long way ahead of it's current competitors. A new Mobitex standard appeared in 1990 offering a gross bit-rate of 8 kbps.

Of the packet data systems that build on mobile telephone infrastructures, CDPD was the first to be standardized in 1993.

The gross bit-rate is 19.2 kbps and the net bitrate is approximately 10 kbps. Although the CDPD standard specifies both an IP and a CLNP interface, Ericsson's CDPD product offers only the IP version. The first CDPD networks went into operation in 1994. Ericsson's first CDPD network went into operation in 1997 in New Zealand.

PPDC was standardized in 1997. It offers a net bit-rate of between 9 and 26 kbps. This flexibility derives from the ability to utilize more than a single time-slot. The PPDC standard specifies an IP interface. The first PPDC networks was in operation in 1996 - before the standard was officially complete!

The GPRS standard will be the last to be completed with phase 1 standardized in spring of 1998 and phase 2 standardization ongoing. The net bit-rate offered is between 9 and 168 kbps, depending on the number of timeslots used. Phase 1 of the standard calls for both an IP and an X.25 interface, phase 2 may specify others.

No comments:

Post a Comment

Hi thank you for comment in Assignment Lanka " Book Mark on me' To future references.

Tag

Assignment Lanka Tag Cloud
Computer Networks The History of Local Area Networks, LAN, The Topologies of a Networks, LANs describe different types of transmission Medias, Local Area Networks Access Methods, Carrier Sense Multiple Access with Collision Detect, Development of LAN Technologies. LAN -Token Ring, LAN Ethernet Digital, LAN - Ethernet Sun microsystems, LAN - Ethernet Mixed Environment, LAN - Token Ring was introduced by IBM LAN - IBM implementation of Token Ring, Token Ring Novell, LAN Token Ring - in a mixed environment, LAN - Fiber Distributed Data Interface, LAN - ATM, LAN Components, LAN Switching Methods, Virtual Local Area Network, Port based VLAN, Mac based VLAN, Protocol based VLAN, User Base VLAN, PC networks Components, PC networks Shared resources, PC Network operating systems, PC networks Novell Netware, PC networks Windows NT, PC networks IBM LAN Server Computer Programming Languages HTML Language, The Generations of Programming Languages, Different types of High Level Languages, Different types of High Level Languages Disadvantages
Computer Networks - IBM LAN Server, Windows NT Networks, Novell Netware, Network operating systems, Networks Shared, Networks Components, User Base, Protocol based, Mac based, Port based, VLAN, LAN Switching, LAN Components, ATM, Fiber Data, Token Ring, Token Ring Novell, IBM implementation, Ethernet, Sun microsystems, Ethernet Digital, Token passing, LAN Technologies, CSMA/CD, Access Methods, Transmission, Networks, The History of Local Area Networks, LAN