Sierra Wireless DART 200 CDPD Modem Especificaciones Pagina 1

Sierra Wireless CDPD Primer 2130006 Rev 1.0 April 2001

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 4 A-side carriers use Band A of the AMPS spectrum. Their cellular phones transmit in the

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 5 • the subscriber moves so that a different cell site provides better coverage, when th

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 6 2.2.7. Cell Handoff Using a typical seven-cell, three-sector channel reuse pattern, cal

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 7 switched—using up the entire bandwidth of a cellular channel for the audible tones used

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 8 3. Background: Introduction to CDPD 3.1. Cellular Digital Packet Data (CDPD) In 1991

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 9 AMPS Voice Unused Time Channel 2 Channel 3 Channel Usage01 23 Unused capacity Channel

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 10 Planned channel hops occur at a time specified by the CDPD network. For example, the

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 11 3.1.4. Base Station Broadcast Parameters CDPD base stations regularly broadcast infor

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 12 The CDPD infrastructure provides a buffer so that, to the wider Internet, packets dest

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 13 3.2.4. Transmission Rate and Peak Throughput CDPD offers raw transmission rates of 19

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page ii Copyright ©2001 Sierra Wireless, Inc. All rights reserved. No part of this publicatio

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 14 The signal could be weaker than desired in locations such as: • Underground parking g

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 15 3.2.9. CDPD Data Transmission Format CDPD data is sent in Reed-Solomon blocks of 378

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 16 4. Infrastructure: CDPD Network Architecture 4.1. Physical: Components of the CDPD N

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 17 4.1.2. Mobile Data Base Station (MDBS) The Mobile Data Base Station (MDBS), together

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 18 4.2. Services: CDPD Network Services When a cellular carrier constructs a CDPD networ

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 19 4.2.4. Network Management Services Network Management Services are administrative ser

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 20 Figure 4-1: ISO layered communications architecture 4.3.1. The Application Layer (La

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 21 4.3.6. The Data Link Layer (Layer 2) The data link layer provides communication betwe

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 22 Figure 4-2: Example of a CDPD virtual terminal subprofile

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 23 5. Operations: Making a CDPD Connection Understanding a CDPD network requires more th

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page iii Contents 1. About this Guide...

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 24 5.1.3. Equipment Identifier (EID) Each M-ES device has an Equipment Identifier (EID),

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 25 update the Subscriber Directory Profile (see section 5.1.3) so that the old NEI can be

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 26 In Figure 5-1, Notebook B sends a transmission to Notebook A. The packet takes these

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 27 M-ES (A)MDBS MD-IS (A)IS (Router)M-ES (B)MD-IS (B)Internet12345786 Figure 5-2: CDPD mo

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 28 When receiving data on the forward (receive) channel from the MDBS, it must: • Receiv

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 29 MAC also measures and maintains statistics about: • The number of frames, blocks, and

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 30 5.6.1. The Radio Resource Management Entity (RRME) The forward and reverse channels o

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 31 In most urban areas, the maximum power level allowed is 2 (600 mW) because of the high

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 32 6. Sierra Wireless Products and CDPD Sierra Wireless produces a number of devices and

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 33 6.5. Original Equipment Manufacturer (OEM) CDPD Devices The SB300 Type III-size CDPD

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page iv 3.2. Features of CDPD...

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 34 7. Additional Resources 7.1. Books Cellular Digital Packet Data System Specification R

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 35 7.2.1. CDPD Coverage and Carriers Wireless Data Forum’s CDPD Coverage Maps. www.wirel

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page v 5. Operations: Making a CDPD Connection...23 5.1. The

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page vi List of Figures Figure 2-1: Forward and reverse channels ...

2130006 Rev 1.0 Page 1 1. About this Guide 1.1. Introduction The Sierra Wireless CDPD Primer is an overview of Cellular Digital Packet Data (CDPD

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 2 2. Telephones and Wireless Data Transmission 2.1. Telecommunications and the Telephon

Sierra Wireless, Inc. CDPD Primer 2130006 Rev 1.0 Page 3 called handsets—can both receive signals from, and send signals to, the base station.