NZ6V8131CHand Held PDA

WIPClip User Manual © Copyright 2001 by Tellus Technology, Inc. All rights reserved. This document may not be copied or translated, in whole or in part, without the express written consent of Tellus Technology, Inc. Disclaimer and Limitation of Liability All other products or services mentioned in this guide are identified by the trademarks or service marks of their respective compa nies or organizations. Any such marks are used here in an editorial manner, to the benefit of the owner, with no i ntention of infri ngement. Their mention does not constitute an endorsement. Tellus Technology, Inc. provides this user manual as is. Tellus Products and its subsidiaries assume no responsibility or loss resulting from the use of this user manual. Tellus Technology may make improvements or changes in the Product this user manual describes at any time witho ut notice. Tellus Technology, Inc. 6140 Stevenson Boulevard Fremont, CA 94538 USA For information, please contact: Technical Support Tel:+1 510 743 2100 Fax:+1 510 580 1600 E-mail: [email protected] Website: www.tellustechnology.com Page i Table of Contents Introduction - WIPClip Springboard Module...............................................................................................2 Introduction to CDPD (Wireless IP)...........................................................................................................2 System Overview.................................................................................................................................2 Subscription to a CDPD Ser vice............................................................................................................2 CDPD System Description....................................................................................................................3 Inserting the WIPClip into the Springboard slot of the Visor........................................................................4 Charging the WIPClip..............................................................................................................................5 Quick Reference......................................................................................................................................5 Customer Support...................................................................................................................................6 Warranty Coverage..................................................................................................................................6 WIPClip User Manual January, 2001 Document #0003MAN001 -Page 2 - I NTRODUCTION - WIPC LIP S PRINGBOARD M ODULE The Tellus WIPClip™ CDPD Springboard™ module is a CDPD (Cellular Digital Packet Data) wireless data modem designed for Handspring™ Visor™ PDA (Personal Digital Assistant). The WIPClip easily snaps into the Springboard expansion slot with a 64-pin connector. The WIPClip modem, mated with the Handspring Visor, gives users mobile data capabilities, enabling wireless access to email, corporate Intranet and the Internet at speeds up to 19.2 kbps. Inserting the WIPClip modem into the Visor’s Springboard expansion platform adds just 3.2 ounces to the Visor and fits perfectly in a shirt pocket. The WIPClip features a rechargeable Lithium Ion battery through the Hot-Sync cradle or the Handspring travel charger without removing the WIPClip modem. The WIPClip uses AT Commands and relies on the TCP/IP stack of the PDA for network access. Since the modem is “plug-and -play”, the AT Commands are transparent to the user. For those wishing to utilize the AT Commands, a built-in terminal program has been provided. I NTRODUCTION TO CDPD (W IRELESS IP) System Overview With the WIPClip module integrated into your Visor, it connects to the public Cellular Digital Packet Data (CDPD) network using Internet Protocol (IP) addresses or to a Virtual Private Wireless IP network. When you send or receive data, CDPD networks use advanced error correction techniques to ensure that your data is received error free. In addition, CDPD networks provide data encryption and authentication services - adding security and privacy - to protect your information as it moves across the network. Thus, CDPD is a reliable, interference-reduced, wireless data-transfer system that provides the freedom to communicate sensitive information in a secure wireless environment. Subscription to a CDPD Service Subscription to a CDPD Network is required for the WIPClip/PDA to function. Tellus Technologies does not include CDPD service activation as part of the WIPClip product. The user must subscribe to a CDPD service just as you subscribe to a cellular or paging service to activate your mobile phone or pager. The carrier records the unique and pre-programmed Equipment Identifier (EID), assigns a Network Equipment Identifier (NEI - an IP address), and sets up a billing account, similar to the assignment of a cellular phone number. WIPClip User Manual January, 2001 Document #0003MAN001 -Page 3 - If you are switching CDPD service providers, you will need to contact the wireless provider of your choice and follow their instructions regarding configuration of the modem to work on their network and to avoid Roaming charges. Printed on the WIPClip label are the EID, Serial Number (S/N), FCC and Industry Canada ID’s and compliance statement. Copy the EID and S/N onto the quick reference form at the end of this WIPClip User Manual. This information offers a convenient, alternate location making it easier to reference your unit if you need to contact the Tellus Help Desk. CDPD System Description It is important to understand how a CDPD Network works and how the WIPClip sends and receives data. It is assumed that the WIPClip has been attached to the Visor via the Springboard slot. The combination of the WIPClip and PDA becomes the Mobile End System, (MES). The MES is connected via the air interface of the Cellular Digital Packet Dat…

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WIPClip User Manual © Copyright 2001 by Tellus Technology, Inc. All rights reserved. This document may not be copied or translated, in whole or in part, without the express written consent of Tellus Technology, Inc. Disclaimer and Limitation of Liability All other products or services mentioned in this guide are identified by the trademarks or service marks of their respective compa nies or organizations. Any such marks are used here in an editorial manner, to the benefit of the owner, with no i ntention of infri ngement. Their mention does not constitute an endorsement. Tellus Technology, Inc. provides this user manual as is. Tellus Products and its subsidiaries assume no responsibility or loss resulting from the use of this user manual. Tellus Technology may make improvements or changes in the Product this user manual describes at any time witho ut notice. Tellus Technology, Inc. 6140 Stevenson Boulevard Fremont, CA 94538 USA For information, please contact: Technical Support Tel:+1 510 743 2100 Fax:+1 510 580 1600 E-mail: [email protected] Website: www.tellustechnology.com Page i Table of Contents Introduction - WIPClip Springboard Module...............................................................................................2 Introduction to CDPD (Wireless IP)...........................................................................................................2 System Overview.................................................................................................................................2 Subscription to a CDPD Ser vice............................................................................................................2 CDPD System Description....................................................................................................................3 Inserting the WIPClip into the Springboard slot of the Visor........................................................................4 Charging the WIPClip..............................................................................................................................5 Quick Reference......................................................................................................................................5 Customer Support...................................................................................................................................6 Warranty Coverage..................................................................................................................................6 WIPClip User Manual January, 2001 Document #0003MAN001 -Page 2 - I NTRODUCTION - WIPC LIP S PRINGBOARD M ODULE The Tellus WIPClip™ CDPD Springboard™ module is a CDPD (Cellular Digital Packet Data) wireless data modem designed for Handspring™ Visor™ PDA (Personal Digital Assistant). The WIPClip easily snaps into the Springboard expansion slot with a 64-pin connector. The WIPClip modem, mated with the Handspring Visor, gives users mobile data capabilities, enabling wireless access to email, corporate Intranet and the Internet at speeds up to 19.2 kbps. Inserting the WIPClip modem into the Visor’s Springboard expansion platform adds just 3.2 ounces to the Visor and fits perfectly in a shirt pocket. The WIPClip features a rechargeable Lithium Ion battery through the Hot-Sync cradle or the Handspring travel charger without removing the WIPClip modem. The WIPClip uses AT Commands and relies on the TCP/IP stack of the PDA for network access. Since the modem is “plug-and -play”, the AT Commands are transparent to the user. For those wishing to utilize the AT Commands, a built-in terminal program has been provided. I NTRODUCTION TO CDPD (W IRELESS IP) System Overview With the WIPClip module integrated into your Visor, it connects to the public Cellular Digital Packet Data (CDPD) network using Internet Protocol (IP) addresses or to a Virtual Private Wireless IP network. When you send or receive data, CDPD networks use advanced error correction techniques to ensure that your data is received error free. In addition, CDPD networks provide data encryption and authentication services - adding security and privacy - to protect your information as it moves across the network. Thus, CDPD is a reliable, interference-reduced, wireless data-transfer system that provides the freedom to communicate sensitive information in a secure wireless environment. Subscription to a CDPD Service Subscription to a CDPD Network is required for the WIPClip/PDA to function. Tellus Technologies does not include CDPD service activation as part of the WIPClip product. The user must subscribe to a CDPD service just as you subscribe to a cellular or paging service to activate your mobile phone or pager. The carrier records the unique and pre-programmed Equipment Identifier (EID), assigns a Network Equipment Identifier (NEI - an IP address), and sets up a billing account, similar to the assignment of a cellular phone number. WIPClip User Manual January, 2001 Document #0003MAN001 -Page 3 - If you are switching CDPD service providers, you will need to contact the wireless provider of your choice and follow their instructions regarding configuration of the modem to work on their network and to avoid Roaming charges. Printed on the WIPClip label are the EID, Serial Number (S/N), FCC and Industry Canada ID’s and compliance statement. Copy the EID and S/N onto the quick reference form at the end of this WIPClip User Manual. This information offers a convenient, alternate location making it easier to reference your unit if you need to contact the Tellus Help Desk. CDPD System Description It is important to understand how a CDPD Network works and how the WIPClip sends and receives data. It is assumed that the WIPClip has been attached to the Visor via the Springboard slot. The combination of the WIPClip and PDA becomes the Mobile End System, (MES). The MES is connected via the air interface of the Cellular Digital Packet Dat…

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Tellus Technology Inc. 6140 Stevenson Boulevard, Fremont, CA 94538, USA CDPD WIPclip V131c BB Block Diagram CDPD ASIC V853 FPGA SRAM EEPROM Spring Board Connector 19.4MHzFromTx/SynthChipset 4.9152MHzXtal OSC 3.88MHz I/O Buffer & Filter CDPD RF Interface RESET External Flash

Tellus Technology Inc. 6140 Stevenson Boulevard, Fremont, CA 94538, USA CDPD WIPclip V131c RF Block Diagram Antenna Frontend Receive SAWFilter Two stage Power Amplifier IF Filter 110.52MH 450KHz IF Transmit SAWFil te r ~ Aux. synth. Main S y nth ÷M φ RM RA N ÷A φ Σ 90 Σ 90 90 φ ÷M ~ ~ ~ TX/S y nth I Q VCO 979.53- 1004.49MH TCXCO 19.44MHz VCO Tank 110.07MH VCO Tank 155.52MH 869.01- 893.97MH 824.01- 848.97 MHz Coupler PA Contro ller DAC input DemodOut

February 7, 2001 Federal Communication Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 To Whom it may Concern: We, the undersigned, hereby authorize Intertek Testing Services to act on our behalf in all matters relating to applications for equipment authorization, including the signing of all documents relating to these matters. Any and all acts carried out by Intertek Testing Services on our behalf shall have the same effect as our own. Tellus Technology Inc. 6140 Stevenson Boulevard Fremont, CA 94538 USA 1.510.743.2100 main 1.510.580.1600 fax www.tellustechnology.com We also hereby certify that no party to the application authorized hereunder is subject to denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Act of 1988,21 U.S.C. 853(a) Sincerely Yours, Inc. President and COO

February 12,2001 Federal Communications Commission Authorization and Evaluation Division 7435 Oakland Mills Road Columbia, MD 21046 To Whom It May Concern: Confidential Information Tellus Technology Inc. 6140 Stevenson Boulevard Tellus Technology considers all circuit diagrams and the Bill ofMaterial (BOM) Yours truly, T~~- ~:~~O & CTO - Tellus Technology Inc. Fremont, CA 94538 USA to be confidential information that should not be disclosed to a third party 1.510.743.2100 main without our consent. 1.510.580.1600 fax www.tellustechnology.com

Tellus Technology Inc. 6140 Stevenson Boulevard, Fremont, CA 94538, USA Statement of Compliance with Equipment Identifier (EID) Regulations The Equipment Identifier (EID) of the Tellus WIPclip, Model V131c, the CDPD Wireless Modem is set in the factory and a unique value is given to each device. The memory device storing the EID is permanently soldered to the main circuit board. An encrypted version of the EID is also stored in a different location in memory. Upon power up, the modem’s microprocessor regenerates an encrypted version of the EID locally using a proprietary algorithm and key known only to Tellus Technology, Inc. and compares it to the encrypted version stored in memory. If these values do not match, the modem is completely disabled and cannot be used in anyway. The EID can be set only by Tellus Technology, Inc.’s configuration and maintenance personnel, and otherwise cannot be altered, transferred, removed, or otherwise manipulated. Any attempt to alter or tamper with the firmware will render the modem inoperative.

May 7, 2001 Re: FCC ID NZ6V8131C Confirmation Number: 13EA100250 To Whom It May Concern: Please note that the email address originally entered on Form 731 for technical contact (David Chernomordik) has changed. Therefore, we have not received any of your information request emails. The old email address was [email protected]. The new email address is [email protected]. Please update and resend your request so that we may respond. Sincerely, Courtney Kemp Project Coordinator Intertek Testing Services.

External Photos NZ6V8131C External Photos NZ6V8131C External Photos NZ6V8131C External Photos NZ6V8131C External Photos NZ6V8131C

WIPclip Label Position.doc Engineering Internal Document Date Engineering Manager____________________ Project Manager ____________________ Engineer ____________________ :,3 &/,3 / $%(/ 3 26,7,21,1* Document Number HW-HWN-0002 Version 1.00.0 February 1, 2001 © 2001 by: Tellus Technology Inc. 6140 Stevenson Blvd. Fremont, CA 94538 510-743-2100 Author: h.w. neff WIPclip Label Position.doc Engineering Internal DocumentTellus Technology, Inc. Doc. Number: HW-HWN-0002Page 2 of 2 1 Introduction This document describes the proper positioning of the external (agency information) label, Tellus P/N 501-0116, on the body of the WIPclip V131C (P/N 501-0000) device. 2 Label Positioning Figure 1 illustrates the location of a properly positioned and oriented label on a WIPclip V131C device. Approximate overall dimensions of the unit are provided, where relevant, as well as dimension information apropos to the label. Figure 1 - WIPclip V131C Label Positioning

2-55 2 POWER AMPLIFIERS Preliminary
   
                        RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
            Si BJTGaAs MESFETGaAs HBT Si Bi-CMOS SiGe HBT Si CMOS 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 GND LMATCH GND VCC GND1 RF IN GND BIAS1 BIAS2 NC RF OUT RF OUT RF OUT NC NC VPC BIAS CIRCUITS PACKAGE BASE GND RF2119

   • Two-Way Pagers • 915MHz ISM Band Equipment • Spread Spectrum Systems • 3V AMPS / ETACS Cellular Handsets • CDPD Portable Data Cards • Personal Digital Cellular The RF2119 is a high-power, high-efficiency amplifier IC targeting 2V to 4V handheld systems. The device is man- ufactured on an advanced Gallium Arsenide Heterojunc- tion Bipolar Transistor (HBT) process, and has been designed for use as the final RF amplifier in hand-held digital cellular equipment, spread spectrum systems, and other applications in the 800MHz to 960MHz band. The device is well suited for either CW or pulsed applications. At 3V, the RF2119 can deliver 29.5 dBm of linear output power. The device is self-contained with 50Ω input and the output can be easily matched to obtain optimum power, efficiency, and linearity characteristics. The pack- age is a PSSOP-16 with backside ground. • Single 2V to 5V Supply • 30dBm Output Power at 2.5V • 30dB Small Signal Gain • 53% Efficiency • On-board Power Down Mode • 800 MHz to 960 MHz Operation RF2119High Efficiency 2 V Power Amplifier RF2119 PCBAFully Assembled Evaluation Board
Rev A7 000404 .059 .051 .197 .189 .244 .228 .030 .018 8 °MAX 0°MIN .009 .008 .157 .150 .012 .008 1 EXPOSED HEATSINK .004 .000 .025 .062 .070 .102 .110 Refer to “Handling of PSOP and PSSOP Products” on page 16-15 for special handling information.        
 !" Preliminary 2-56 RF2119 Rev A7 000404 2 POWER AMPLIFIERS Absolute Maximum Ratings ParameterRatingUnit Supply Voltage (RF off)+8.0V DC Supply Voltage+5.2V DC Control Voltage (V PC )+3.0V DC Input RF Power+12dBm CW Dissipated Power1.8W Peak Dissipated Power2.5W Operating Case Temperature-30 to +110°C Storage Temperature-30 to +150°C Parameter Specification UnitCondition Min.Typ.Max. Overall T=25°C, V CC =2.5 V, V PC =2.2V, Freq =902 MHz, P IN =2dBm Usable Frequency Range800902960MHz Small Signal Gain30dB Maximum CW Output Power29.530.531.5dBmSupply Voltage = 2.5 V 313234dBmSupply Voltage = 3.0 V 32.533.535dBmSupply Voltage = 3.5 V 29.3dBmSupply Voltage = 2.0 V Maximum Pulsed Output Power303132Supply Voltage = 2.5 V, 12.5 % duty cycle 31.53334.5Supply Voltage = 3.0 V, 12.5 % duty cycle 333435.5Supply Voltage = 3.5 V, 12.5 % duty cycle Total CW Efficiency 4551% Pulsed Efficiency4753%12.5 % duty cycle Input Power0+2+6dBm OFF Isolation-25dBmV PC = 0 V, Input Power= +6 dBm Second Harmonic Suppression45dBc Third Harmonic Suppression>60dBc Input VSWR<2:1With a 50 Ω source impedance Output Load VSWR10:1No damage. AMPS Application #1 T=25°C, V CC =3.4 V, V PC =1.8V, Freq =836 MHz, P IN =+3dBm Frequency824 to 849MHz Maximum Output Power30.5dBm Efficiency @ Maximum Output Power 50% Idle Current195250mA Second Harmonic Suppression-45dBc Current Total760mA AMPS Application #2 T=25°C, V CC =3.5 V, V PC =1.6V, Freq =836 MHz, P IN =+8dBm (see AMPS application schematic) Frequency824 to 849MHz Maximum Output Power29.530.5dBmV CC =2.7V 30.831.5dBmV CC =3.0V 3233dBmV CC =3.5V Efficiency @ Maximum Output Power 5055% Idle Current120mA I PC @ Maximum Output Power20mA Power Down Control Turn On/Off Time100ns V PC “OFF” Voltage0.20.5V Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Refer to “Handling of PSOP and PSSOP Products” on page 16-15 for special handling information. Preliminary 2-57 RF2119 Rev A7 000404 2 POWER AMPLIFIERS V PC “ON” Voltage2.02.22.8V I PC “ON” Current30mAV PC =2.2V I PC “OFF” Current10 μ AStandby, V PC =0.5V Power Supply Voltage 2.5VSpecifications Voltage 2.05.0VOperating Limits Current Total7009001200mAV CC =2.5V, V PC =2.2V, P IN = +3 dBm, T = 25° C Preliminary 2-58 RF2119 Rev A7 000404 2 POWER AMPLIFIERS PinFunctionDescriptionInterface Schematic 1GND Ground externally. 2LMATCH Interstage tuning. This pin is internally DC blocked and will connect to a shunt inductor or microstrip line used for interstage tuning. Length from pin to via should be approximately 60 mils for 915 MHz and 75 mils for 902 MHz and 120 mils for 836 MHz. The lumped element equivalent is 1.2 nH to 2.0 nH to ground, depending on frequency band of interest. 3GND Ground externally. 4VCC1 Power supply for stage 1. V CC should be fed through a 3.9 nH inductor with a decoupling capacitor on the V CC side. 5GND1 Ground for stage 1. Keep traces physically short and connect immedi- ately to ground plane for best performance. 6RF IN RF input. An external DC blocking capacitor is required if this port is connected to a DC path to ground or a DC voltage. 7GND Ground externally. 8BIAS1 Ground return for the first stage bias. This pin should be connected to a 33 nH inductor to ground. 9VPC Power control voltage. For maximum power, this voltage should be at least 2.2 V. To turn off, this voltage should be less than 0.6 V. This pin should be bypassed as close to the pin as practical. 10NC No connection. 11NC No connection. 12RF OUT RF output and power supply for the output stage. The bias for the out- put stage is provided through this pin and pin 13. An external matching network is required to provide the optimum load impedance; see the application schematics for details. 13RF OUT Same as pin 12. 14RF OUT Same as pin 12. 15NC No connection. 16BIAS2 Ground return for the second stage bia…

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139203 Tellus Proprietary Doc. Number: XXX-XXXX 1 W IPCLIP V131C CDPD M ODEM T RANSMITTER D ESCRIPTION March 6, 2001 © 2001 by: Tellus Technology Inc. 6140 Stevenson Blvd. Fremont, CA 94538 510-743-2100 PROPRIETARY RIGHTS N0TICE: The information, data, and drawings embodied in this document are the proprietary and strictly confidential property of Tellus Technology, Inc. and supplied on the understanding that they will be held confidentially. Possession by and of itself does not convey any rights of ownership. This document may not be reproduced, in full or in any part hereof, by any means, including photocopying, recording, or through any information storage and retrieval system, without the expressed written consent of Tellus Technology, Inc. Project Manager ____________________ Engineer Leycheo h Lim Tel: 510-743-2139 Fax: 510-580-1600 139203 Tellus ProprietaryVersion: X.XX.X Revision: XXXX Doc. Number: XXX-XXXX 2 1 Tellus WIPclip V131c CDPD Modem 1.1 Transmitter Description and Theory of Operation The transmitter for WIPclip V131c utilizes the CD8455 transmit modulator chip for frequency up-conversion and IQ modulation. The transmitter is a single conversion design employing direct IQ modulation. An internal synthesizer controls an external tank circuit to generate a fixed frequency of 155.52MHz. The 155.52MHz is mixed with a high-side injection in the CD8455 chip for frequency up-conversion. The RF carrier is fed to the IQ modulator in the chipset for modulation. The carrier is modulated with I and Q signals from the baseband ASIC. The modulated signal passes through a pre-driver in the CD8455 chip. The differential modulated output signal is fed to a transformer, and pass through a SAW filter before being amplified by an external power amplifier. The signal is amplified to a nominal level of –2 dBW by the power amplifier. The signal from the power amplifier is routed through a frequency duplexer and out to the antenna. Data from the modem is transmitted in bursts. Each transmit burst includes a ramp-up and ramp-down sequence to limit the frequency bandwidth occupied. The transmit power-level that the modem uses for each burst is calculated based on parameters broadcast by the CDPD base station and the actual RSSI reading at the modem. The WIPclip V131c conforms to power class 3 device per CDPD specification 1.1, hence, it transmits at nominal power levels from -22dBW to -2dBW in 4dB steps. 1.2 Limitation of Spurious Radiation The WIPclip V131c contains one SAW filter and one duplex filter in the transmit chain to suppress unwanted mixing products and harmonics before reaching the antenna. The CDPD system employs Gaussian-filtered Minimum Shift Keying (GMSK) modulation with BT=0.5. The pre-modulation Gaussian low pass filter results in increased spectral efficiency. Smooth ramp-up and ramp-down are performed at the beginning and end of each transmit burst to limit the emission spectrum spill over into adjacent channels. 1.3 Limitation of Modulation The WIPclip V131c uses IQ modulation in the transmitter, which results in high modulation accuracy. I and Q signals from the baseband are combined with the carrier frequency in a quadrature modulator circuit to create the transmit signal. With this implementation, no frequency related adjustment of the modulator is required. 139203 Tellus ProprietaryVersion: X.XX.X Revision: XXXX Doc. Number: XXX-XXXX 3 1.4 Limitation of Output Power The power amplifier in the WIPclip V131c is a two stage GaAs HBT amplifier. Power control for the transmitter is accomplished by varying the bias voltage of the power amplifier through a power controller device. The power control loop has an accuracy of +/- 1dB. The power amplifier is operating from 3.5V to 4.2V DC. The maximum current at +28dBm is less than 1.0A. At the minimum output power of +8dBm the current is less than 0.5A. The maximum output power of the amplifier is less than +30dBm over the temperature range of 0 Celsius to 45 Celsius at 4.2V. This, along with the minimum duplexer insertion loss, ensures that the absolute maximum specified transmitter power of 1W won’t be exceeded. 1.5 Transmitter Tune-up Procedure There is no mechanical tuning needed to adjust the transmitter’s frequency, modulation, or power. All tuning is done electronically during manufacturing test to ensure that frequency and power is not only within specification but also centered at optimum values.

Tellus Technology Inc. 6140 Stevenson Boulevard, Fremont, CA 94538, USA WIPCLIP V131c Duty Cycle There are several levels to note regarding the duty cycle for transmissions from a WIPclip V131c, which implements the CDPD protocol. First is the duty cycle range allowable from the CDPD protocol itself. Second is the method of transport of transmission packets. Lastly, the end application controls the amount of data that is transmitted. At the first level, the absolute maximum duty cycle possible from the CDPD spec is 98.3%, which is derived from an absolute maximum ON time of 1.288458 seconds and an absolute minimum OFF time of 0.021875 seconds. In practice, the maximum ON time and the minimum OFF time are both parameters dictated by the operators of the network on which the device is operating. For the AT&T network, the typical maximum duty cycle is 73.8%, which is derived from their typical broadcast maximum ON time of 0.325958 seconds and their minimum OFF time of 0.115625 seconds These maximum times assume that the user has an infinite amount of data to transmit, that the transmission channel is error free, that the transmission channel and frequency is always available when needed (not being used by another transmitting device), and that the data can be delivered to the WIPclip V131c faster than the rate that it is being transmitted. In addition, it assumes that the WIPclip V131c does not wait for responses from the transmissions. For any practical transport protocol, the continuous transmission assumption is unrealistic because there needs to be a mechanism from the receiving endpoint to signal back to the transmitter that particular portions of the data have or have not been correctly received. For CDPD, the most common transports are ICMP, TCP, or UDP. These protocols either have built in feedback mechanisms, or mechanisms built in by the user. In TCP for instance, the recipient must acknowledge packets before additional packets are sent. This feedback requires at least a round trip air time at the minimum, which translates into additional idle (transmitter OFF) time in the WIPclip V131c. Lastly, the application will dictate when and how often transmission of data is required. Typical application and use for the WIPclip V131c is “Web-browsing” and email. Web- browsing is an asymmetrical operation: small amounts of transmission are required to deliver the user commands (document addresses) to the server, and large amounts of reception as the server returns the data (document contents) to the user.

139375 Tellus Proprietary Doc. Number: XXX-XXXX 1 W IPCLIP V131C CDPD M ODEM T RANSMITTER D ESCRIPTION March 7, 2001 © 2001 by: Tellus Technology Inc. 6140 Stevenson Blvd. Fremont, CA 94538 510-743-2100 PROPRIETARY RIGHTS N0TI…

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