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Technology Stocks : Ericsson overlook? -- Ignore unavailable to you. Want to Upgrade?

To: P2V who wrote (3345)	6/8/1999 11:36:00 AM
From: Caxton Rhodes	Respond to of 5390

Hi Mardy- This is a good start. cdg.org. Caxton

To: P2V who wrote (3345)	6/8/1999 4:15:00 PM
From: w molloy	Read Replies (1) \| Respond to of 5390

Marden - Stack Answers >> Is the IS-95 Stack distinct from the OSI and/or the TCP/IP stacks ? Yes, it is. The OSI 'model' is an ideal representation of a protocol stack. It illustrates key principals of all layered implementations 1. Each layer offers a specific service or services to the layer above e.g. L2 guarantees error free delivery of frames. in the correct order, to L3 2. Layers communicate with their peers e.g. Handset L2 'talks' to Base station L2 when establishing the service to be offered to their respective L3's TCP/IP strictly speaking isn't a stack. Its a protocol suite. It evolved for use on Ethernet connections, and major elements have been adopted by applications requiring connection to remote devices (say via the internet). Underlying 'connectivity' stacks (e.g IS-95) have been specified to make connection to TCP/IP, so the application is ignorant of the physical connection used (whether its CDMA, GSM. PHS, Ethernet etc) I've described IS-95 and it's ilk as connectivity stacks. These specifications define the physical air interface (CDMA ,GSM-TDMA, PHS-TDMA whatever) and the management of connections made on the physical interface. For example, how to synchronise with a basestation, definition of message exchange for registration, Call control, Mobility Management (and handoff) etc. >> Are there "GSM/TDMA or CDMA for Dummies" texts available ? Not for dummies I'm afraid :-) Basic Texts I would recommend are OSI : Tenebaum A " Computer Networks " Prentice-Hall Required text for undergraduate communications course CDMA : Karg V K. et al " Applications of CDMA in Wireless/Personal Communications" Prentice-Hall 1997 Great intro into CDMA. I would have been lost without it. GSM : Redl S M. et al " An Introduction to GSM" Artech House 1995 A basic text. Includes a potted description of OSI Layering principles TCP/IP : Stevens W R. "TCP/IP Illustrated Vol. 1" Addison-Wesley 1994 More than you ever wanted to know about TCP/IP. Introductory chapters are outstanding. Hope this helps. w.