Page 2
General TERMS OF USE OF NEW MATERIALS ‐ PLEASE READ CAREFULLY From time to time, SkyPatrol, in its sole discretion, may make available for download on its website (www.SkyPatrol.com), or may transmit via mail or email, updates or upgrades to, or new releases of, the firmware, software or documentation for its products (collectively, 'New Materials'). Use of such New Materials is subject to the terms and conditions set forth below, and may be subject to additional terms and conditions as set forth in SkyPatrol’s Technical Support Policy (posted on its website) and/or any ...
Page 3
[Revised: 11/11/2010] This warranty applies to (a) products sold directly by SkyPatrol, unless a different warranty is specified in a written agreement between SkyPatrol and the purchaser; and (b) products sold to end users through a distributor authorized by SkyPatrol, but only where the authorized distributor does not provide a separate warranty on such products, and SkyPatrol has agreed to provide this warranty to such end users. If you purchased the product from an authorized distributor, please check whether this warranty from SkyPatrol, or a separate warranty from the distributor, applies to your purchase. This warranty does not apply to any (i) accessories or batteries for the products; or (ii) demonstration samples or prototypes of the products. ...
Page 4
In the event SkyPatrol repairs or replaces a defective product covered by this limited warranty, the repaired or replacement product will be covered under this limited warranty for the remainder of the original warranty period on the defective product, or a period of ninety (90) days, whichever is longer. If SkyPatrol is unable to repair or replace a defective product covered by this limited warranty, SkyPatrol will provide to purchaser a credit or a refund (at SkyPatrol’s option) of the original purchase price (excluding taxes and shipping charges). Any returned and replaced product, or any product for which SkyPatrol has furnished a credit or a refund, becomes the property of SkyPatrol. SkyPatrol shall not have any obligation to provide any firmware bug fixes, upgrades or new releases except ...
Page 5
SkyPatrol TT8950 warranties or the exclusion or limitation of incidental or consequential damages, so the above disclaimer, limitation or exclusion may not apply to products sold in those jurisdictions. This limited warranty gives the purchaser specific legal rights and the purchaser may have other legal rights that vary from jurisdiction to jurisdiction. This limited warranty shall be governed by the laws of the State of Texas, United States of America, without regard to conflict of laws principles. This limited warranty shall not be governed in any respect by the United Nations Convention on Contracts for the International Sale of Goods. Regulatory Compliance FCC This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits pursuant to Part 15 Subpart B, Part 22, and Part 24 of the FCC rules. These limits are designed to provide reasonable protection against ...
Page 6
SkyPatrol acknowledges that the installation, setup and transmission guidelines contained within this publication are guidelines, and that each installation may have variables outside of the guidelines contained herein. Said variables must be taken into consideration when installing or using the product, and SkyPatrol shall not be responsible for installations or transmissions that fall outside of the parameters set forth in this publication. ‐ VI ‐ ...
TT8950 User Guide 1 Introduction 1.1 Objective The objective of this document is to provide the user with basic information about the Spider MT Series, including how to configure the device and verify communication with SkyPatrol’s UDP API test server. Capabilities of the SkyPatrol Spider MT devices include: • GSM Registration • RTC Alarm • GPRS Registration • Memory Full Percentage • Velocity • Input Event Counter • Geo‐Fence • GPS Overspeed • IP Status • Message Log Count • GPS Status • SMS Indication • Timer • GPS Distance ...
TT8950 User Guide 2 Overview 2.1 Description The TT8950 has a V0 fire rated plastic housing measuring 82 x 46 x 21 mm. It contains internal GPS and quad‐band GSM antennas, an internal SIM holder, 16‐pin Molex I/O connector, a USB 2.0 connector, and three LED indicators. TT8950 Panel Illustration Figure: 2 ‐ TT8950 ‐ 3 ‐ ...
SkyPatrol TT8950 2.2 Label The TT8950 has a printed label on the top side of the device. The figure below shows the information included on the label. Figure: 3 ‐ TT8950 Label 2.3 Accelerometer The three‐axis digital accelerometer provides the following features: • Motion alert (towing alert) • Driver behavior reporting • Rapid acceleration • Harsh braking • Configurable thresholds • Range settings • Mode (Normal, Sleep, Wakeup) • Wakeup pause (20 to 2560 msec) • Sample Rate (0‐25 per second) • Filter Coefficient and Filter Bandwidth • Device Orientation Setup ‐ 4 ‐ ...
TT8950 User Guide 2.4 Battery Power Switch The TT8950 Battery Power Switch is used to apply or remove battery power to the device. The on position is with the switch toward the dot. The off position is with the switch moved away from the dot. The figure below shows the TT8950 Battery Power Switch in the on position. The power switch must be placed in the on position before the optional backup battery may be used for programming or operating the TT8950. Figure: 4 ‐ TT89500 Power Switch Move the power switch to the off position when shipping or transporting the device by air. ‐ 5 ‐ ...
SkyPatrol TT8950 2.5 Connector and LEDs The TT8950 includes a 16‐Pin I/O connector, a USB 2.0 connector, and LEDs to indicate GSM, GPS, and power status. Figure: 5 ‐ TT8950 Connectors and LEDs 2.6 GSM Radio The TT8950 contains a quad‐band (850/900/1800/1900 MHz) GSM radio. • Class 4 (2W@850/900 MHz) • Class 1 (1W@1800/1900 MHz) 2.7 GPS GPS functionality includes: • NMEA update with all data points • Binary • Buffered GPS message feature • Geo‐fencing • Virtual odometer ‐ 6 ‐ ...
TT8950 User Guide 2.8 GPIO The TT8950 includes the following inputs and outputs: • 2 (0‐16V) analog inputs • 1 user programmable digital input • 1 latched output • 2 user programmable digital outputs ‐ 7 ‐ ...
SkyPatrol TT8950 3 Hardware Features 3.1 Opening the Device It is highly recommended that you use the Metal Lever (SkyPatrol part number GPS0309MG299) when opening the TT8950 in order to prevent damaging the device. To open the TT8950, follow the following steps: 1. Insert the curved foot of the Metal Lever into the gap between the lid and the body next to the retainer snaps as shown below. Figure: 6 ‐ Opening the TT8950 Case 2. Gently apply pressure upwards on the lever until the lid unsnaps. Figure: 7 ‐ TT8950 With Cover Unsnapped ‐ 8 ‐ ...
TT8950 User Guide 3. Carefully slide the cover off the device. 3.2 Closing the Device Replace the TT8950 cover by using the following steps: 1. Place the TT8950 cover onto the base as shown in the following figure. Figure: 8 ‐ TT8950 Cover Replacement 2. Carefully slide the lid so that it snaps in place. 3.3 SIM Card Access The TT8950 includes an onboard SIM carrier. There is no external access to the SIM. ‐ 9 ‐ ...
SkyPatrol TT8950 Figure: 9 ‐ TT8950 Internals 3.4 Power The TT8950 requires 9‐16 VDC input power. Pin 11 on the 16‐Pin IO connector is the power input and pin 6 is ground. The TT8950‐0xFTS01 and TT8950‐90FTV50 models do not have an inline power fuse. An inline power fuse has been added to TT8950‐0xFTS02 and TT8950‐90FTV51 and later models. 3.5 Optional Battery Backup An optional 230 mAH backup battery is available. The battery backup may be turned off using a recessed on/off switch when required (e.g. when shipping by air). The following figures show the optional battery and the connector cable. ‐ 10 ‐ ...
SkyPatrol TT8950 3.6 USB 2.0 Connector Warning: The USB (2.0) connector is an input/output connector and is not intended for general use. This connector should only be used when programming the modem’ Note: This USB port cannot be used to supply power to other USB devices and nothing should be connected to this port which the vehicle is in motion. The USB connector is only used to program the modem. When programming the modem, a USB cable is required. 3.7 USB Cable The USB connector is only used to program the modem. When programming the modem, a USB cable is required. ‐ 12 ‐ ...
SkyPatrol TT8950 Figure: 13 ‐ USB Power Cable with I/O and Audio Construction 3.8 16‐Pin I/O Connector The 16‐Pin I/O Connector provides the following functionality: PIN SIGNAL 1 Mic + (Differential Audio Input) ‐ 14 ‐ ...
TT8950 User Guide 5 Installation 5.1 Inserting the SIM Insert the SIM per the following procedure: Note: The SIM card is not provided with the TT8950 device. The SIM must be obtained from the GSM/GPRS service provider and must be provisioned by the operator for data. Always take care to protect the SIM. Without the SIM installed, the TT8950 modem is not able to communicate on the network. 1. Carefully remove the device cover to access the internal SIM holder. 2. Insert the SIM into the SIM holder of the TT8950. 3. Replace the cover. Figure: 15 ‐ TT8950 SIM Holder with SIM Installed (Lower Left) 5.2 Device Installation The TT8950 case includes molded anchor points for mounting as shown in the figure below. Additionally, the device must be mounted with the correct side facing skyward as shown in the figure below. ‐ 19 ‐ ...
SkyPatrol TT8950 See "Device Installation" on page Figure: 16 ‐ TT8950 Mounting Anchors and "Sky Side" Label Power must be applied to the TT8950 by moving the Battery Power Switch to the ON position before connecting any auxiliary I/O device. Failure to apply power to the TT8950 before connecting auxiliary devices may result in damage to the attached I/O device The TT8950 must be securely mounted to ensure proper accelerometer operation. Mounting the device to cable runs or other structures that may allow the device's orientation to shift may cause inaccurate results to be reported by the accelerometer 5.3 USB Driver Installation These instructions illustrate how to correctly install the USB drivers in Windows XP. The procedure will vary for other Operating Systems. 1. Connect the Device to the USB port on a Windows‐based computer. 2. Install the USB drivers (as described in this section). ‐ 20 ‐ ...
TT8950 User Guide Connect the device to a USB Port Supported Operating Systems include Windows 2000, Windows XP, and Windows Vista, Windows 7. When you connect the device to the computer, you will be prompted to install the drivers. Note: In order to access the USB port on the device , you may need to remove the cover Follow the steps in the next section to install the drivers. Install the USB Drivers After you download the USB drivers, make sure you note the location on your computer where the drivers are located. Note: Drivers can be downloaded from the SkyPatrol® Website. After connecting the device to the computer, follow these steps to complete the installation of the USB drivers: There may be multiple steps to installing the USB drivers. Once each step is complete, the process will automatically begin again. The following screen captures may reflect a different device driver that the one you are installing, however the steps in the procedure will remain the same ...
SkyPatrol TT8950 1. The Windows Operating System will detect the new USB device. 2. You will see the following screen: 3. Figure: 17 ‐ Found New Hardware Wizard Window 3. Click on No, not this time. 4. Click Next. 5. You will see the following screen: The name of the driver may vary based on the product, but the process remains the same. ‐ 22 ‐ ...
TT8950 User Guide Figure: 18 ‐ Hardware Wizard – Install from specific location 6. Click the radio button next to Install from a list or specific location (Advanced). 7. Click Next. 8. You will see the following screen: ‐ 23 ‐ ...
SkyPatrol TT8950 Figure: 19 ‐ Hardware Wizard – Search for best driver 9. Click on the check box marked Include this location in the search. 10. Browse to the location on your computer where the USB drivers are located. 11. Click Next. 12. You may see the following screen: ‐ 24 ‐ ...
TT8950 User Guide Figure: 20 ‐ Hardware Wizard – Windows Logo testing Figure: 21 ‐ Note: If you see this warning, click on Continue Anyway 13. You will see the screen that shows the installation progress: ‐ 25 ‐ ...
SkyPatrol TT8950 Figure: 22 ‐ Hardware Wizard – Install Progress 14. When the installation of the USB device driveris complete, you will see the following screen: The name of the driver may vary based on the product, but the process remains the same. ‐ 26 ‐ ...
TT8950 User Guide Figure: 23 ‐ Hardware Wizard – Completing 15. Click Finish. This process may need to be repeated a number of times depending on which device driver is being installed. ‐ 27 ‐ ...
SkyPatrol TT8950 6 Network Test Procedure 6.1 Configure the Computer and Verify Correct Communications Please refer to SkyPatrol document TT8850UG001– USB driver Installation section for detailed instructions for installing USB drivers and connecting with the modem. Configure the Device to Communicate with the SkyPatrol Server Note: In the following instructions, <CR> means using the Enter Key on the keyboard. 1. Connect and verify connectivity with the device. a. Connect the PC connector to the device. b. With HyperTerminal open, hit the Enter key. The device should respond with OK. If you do not see this response, double‐check your connections. If the connections seem correct, disconnect the TT8950 from the computer and perform a serial loop‐back test. c. Type AT<CR>. The device should respond with OK. i. If you do not see the letters AT, send the following command to the device: ...
TT8950 User Guide Figure: 24 ‐ ATI Response 2. Configure the device to communicate with the SkyPatrol Test Server. a. The following information will need to be obtained from the SIM provider. Please refer to GSM0000AN019 – Network Configuration Worksheet. i. APN ii. Username and password (If necessary.) b. Reset the device to factory defaults: i. To restore the device to factory defaults, send the following command: AT&F<CR> ii. To write current configuration to memory, send the following command: AT&W<CR> iii. To reset the device, send the following command: AT$RESET<CR> c. Configure the device to access the GPRS network. i. To configure the device with the proper APN, send the following command: AT+CGDCONT=1,”IP”,”apn”<CR> (substitute the letters “APN” for the supplied APN.) ii. To configure the device with the proper username and password, (if necessary) send the following command: AT%CGPCO=1,”username,password”,0<CR> (substitute the correct username and password) iii. To configure the device to enable auto GPRS registration, send the following command: AT$AREG=2<CR> ‐ 29 ‐ ...
Page 40
SkyPatrol TT8950 Note: When the device is reset, Windows will detect the detachment of the device and you may have to close and reopen the communication program to reestablish communications with the device. Verify GSM status by sending the following command: AT+CREG?<CR> If everything is working, you should receive one of two responses: +CREG: 0,1 (GSM registered to home network) OR +CREG: 0,5 (GSM registered roaming.) Verify GPRS status by sending the following command: AT%CGREG?<CR> If everything is working, you should receive one of two responses: %CGREG: 0,1 (GPRS registered to home network) Or %CGREG: 0,5 (GPRS registered roaming.) See Figure: 25 - "Verify GPRS Status" ‐ 30 ‐ ...
TT8950 User Guide Figure: 25 ‐ Verify GPRS Status Verify GPRS activation by sending the following command: AT$NETIP?<CR> If the response is non‐zero, then everything is working. See Figure: 26 - "Verify GPRS Activation" ‐ 31 ‐ ...
SkyPatrol TT8950 Figure: 26 ‐ Verify GPRS Activation If AT$NETIP returns all zeros, send the following command: AT$CGEER<CR> There are three common responses: • $CGEER: no PDP reject cause (Everything should be working OK) • $CGEER: requested service option not subscribed (APN is incorrect or SIM has not been enabled for data mode.) • $CGEER: user authentication failed (username and/or password is incorrect.) Configure the device to access the SkyPatrol Server. To configure the device for server interoperability, several things have to be addressed: • Most GPRS configurations are Mobile Originate only. The mobile device must initiate a conversation with a remote server before the remote server can talk to the device. • IP addresses are dynamically assigned and can change. • Some IP addresses are NAT and are non‐routable IP addresses. ‐ 32 ‐ ...
Page 43
TT8950 User Guide These issues are addressed with the following configuration commands. The examples will use the following information: • Modem ID/name = “MT_Test” • Remote Server DNS address = apitest.SkyPatrol.com • Remote Server IP port = 1721 1. Give the device a unique name send the following command: AT$MDMID=”MT_Test” This command, combined with the wakeup message, will allow the server to associate a Public IP address with a specific device and create a window of opportunity where the server can send commands to the device See Figure: 4 ‐ "Wakeup Command" 2. To talk with a specific server send the following command: AT$FRIEND=1,1,”apitest.SkyPatrol.com” 3. To set the port number send the following command: AT$UDPAPI=,1721 4. To Enable periodic messages (wakeup) to be sent to the server every 60 seconds send the following command: AT$WAKEUP=1,1 See Figure: 27 - "Wakeup Command" ...
SkyPatrol TT8950 Figure: 27 ‐ Wakeup Command 6.2 Verifying Server Connectivity Note: For the following tests, Java Runtime must be installed on the computer. (To install Java Runtime, please visit the Java website: http://www.java.com/en/download/manual.jsp) 1. Start Internet Explorer and enter the following URL: http://apitest.SkyPatrol.com/udpapp/ 2. Enter the name used in the MDMID command in the box. Select Connect See Figure: 28 - "Verify Server Connectivity" ‐ 34 ‐ ...
TT8950 User Guide Figure: 28 ‐ Verify Server Connectivity 3. Select the tab with the device name. (In this diagram it is labeled "MT_Test") Within approximately 60 seconds the wakeup messages should be seen in the window See Figure: 29 - "Wakeup Messages" ‐ 35 ‐ ...
SkyPatrol TT8950 Figure: 29 ‐ Wakeup Messages 4. Enter the following command in the command/ data block: 5. Select Write 6. Verify that you see the device respond with SkyPatrol LLC. See Figure: 30 - "ATI Response" . If so, you have successfully configured the device to talk with the server. ‐ 36 ‐ ...
TT8950 User Guide Figure: 30 ‐ ATI Response 6.3 Verify GPS Operation Follow these directions to verify GPS Operation. 1. From the terminal window, send the following command: AT$GPSRD=10<CR> 2. The device should respond with a standard GPRMC message that looks similar to the following: $GPRMC,221223.00,A,3301.5080,N,09642.3857,W,000.0,000.0,230805,05.9,E,A*19 • A = OK • V = Warning • 9 = SkyPatrol Specific response that GPS solution is not valid and the last known GPS location is being substituted. Here is an example of a GPRMC message without a GPS lock: $GPRMC,221553.30,V,,,,,,,,,,N*7C The same command can be used in the server application See Figure: 31 - "Verify GPS Operation" . ‐ 37 ‐ ...
TT8950 User Guide 7 Glossary A Analog Analog refers to signals that can represent an infinite range of numbers, as opposed to digital which can only be distinct whole numbers. Analog data often comes from measurements, like a sine wave. The sound a modem makes over the phone is analog since it can be any of a number of different frequencies. The fixed‐line networks usually transfer analog data and fax. The GSM networks are Digital. ANSI ANSI graphics is a set of cursor control codes which originated on the VT100 smart terminal. Many BBS's use these codes to help improve the sending of characters to communications programs. It uses the escape character, followed by other characters, which allows movement of the cursor on the screen, a change of color, and more. ASCII American Standard Code of Information Interchange. It uses 7 bits to represent all uppercase and lowercase characters, as well as numbers, punctuation marks, and other characters. ASCII often uses 8 bits in the form of bytes and ignores the first bit. ASCII transfer When a text file is sent directly as it is, without any special codes. Asynchronous Transmission Transmission method in which the intervals between transmitted characters may be unequal of length. Transmission is controlled by start and stop bits at the beginning and end of each character. This way, if there is line noise, the modem can find out right away where the next byte should start. AT commands AT is a contraction of attention, a command used to program SmartModems from Hayes Microcomputer Products. AT commands program a variety of modem hardware settings and were adopted by other modem manufacturers who wanted to market their wares with the coveted phrase Hayes‐compatible. At one time, you couldn't call yourself an online aficionado if you didn't know that ATL0 turned your modem speaker way down and ATM0 turned it off. Now the commands are usually hidden under a menu option in your communication software. Auto Reliable The ability of a modem to be able to communicate both with modems that do have error‐control and/or data compression, and those that do not. ...
Page 50
SkyPatrol TT8950 B Bandwidth The difference between the upper and lower limits of a band. A range of radio, audio, or other frequencies. Since it is so limited, a modem must carefully change data into sounds that "fit" within this range. Similar to frequency spectrum. Bandwidth of a voice channel is 3000Hz‐300Hz which equals 2700Hz. Telephone lines have a bandwidth from 300 hertz to 3400 hertz. Baud A term referring to the speed at which modems communicate. Technically, it is the number of changes in an electronic signal per second. Since the number of changes used to be the same as the number of bits sent or received per second, bps and baud are often used interchangeably. However, there is a difference, which is very often confused. For example, many 1200bps modems were advertised as 1200 baud, even though they operate at 600 baud. They send out 2 bits 600 times a second, which means that it is 600 baud. However, since it is so often misunderstood, you can assume that when you see "baud" it means bits per second, unless it is stated otherwise. The term comes from the scientist J. M. E. Baudot. BFT Binary File Transfer Bit A Binary digIT. It is a number in base 2 (binary), which means that it can only be a 0 or a 1. It is used in the expres‐sion `bits per second'. Block size When used with either error control or data compression protocols, refers to the number of characters to be sent at one time. If error control is used, the codes are sent immediately following this block. Typical block sizes are 64, 128, 192, or 256 characters. Small block sizes are better when the line quality is bad (such as for long distance calls), while large block sizes are better during good connections (such as for local calls). bps Bits Per Second. The transmission speed of most modems is measured in baud or bps. Bps is literally the number of bits sent by the modem every second. byte A group of 8 bits. It usually represents one character. C Carrier Detect The information as to whether or not the modem senses a carrier, like a fixed‐line dialling tone or a ...
Page 51
TT8950 User Guide Carrier Detect Threshold A way of measuring how well a modem can detect valid data over noisy phone lines. It is measured in negative dBm's (decibel‐milliwatts). The bigger the number (the more negative) the better. For example,45 dBm is better than40 dBm. CCITT Consultative Committee International on Telephones and Telegraphy. Used to set standards for modems. Replaced by the ITU. CDMA Code Divison Multiple Access. A digital cellular technique invented by Qualcomm. Cell The receiver/transmitter a GSM phone connects to; the equivalent of the base station of a cordless phone. A cell can support a number of simultaneous calls. Cell Broadcast Cell Broadcast is designed for simultaneous delivery of messages to multiple users in a specified area. Checksum A number that represents a larger group of numbers in order to check for errors in data transmission. It is commonly used when downloading a program, as well as in error control protocols. The checksum is the result of a mathematical equation, such as adding all the numbers in a block together. CLIP Caller Line ID Presentation. A code that is sent over the phone lines in some areas when a person makes a phone call. This code includes the phone number of the person making the call. Some modems are able to understand this signal, and let you know who is calling you before you answer the phone. CLIR Caller Line ID Restriction. The ability to block someone who you're calling from seeing your number. CODEC COmpressor/DECompressor, the chip inside every digital GSM cellphone that allows the cellphone to tranmsit voice data at high efficiency and speed across the GSM cellular network. The CODEC will trip redundant voice data like when neither party is talking allowing more effcient use of scarse bandwidth. Compress To make data take up less space. Archiving programs do this, which means that files will take less time to transfer with modems. Many modems now have the ability to automatically compress the information they send and receive. ...
Page 52
SkyPatrol TT8950 D Data Transmission rate The speed at which data travels. For example, data may be sent at 115,200bps. Same as transmission rate, transmission speed, data rate. dBm Decibel refers to one milliwatt. This is used to measure certain levels, such as transmit level. DCE Data Circuit Terminating Equipment. Sets up and maintains a data connection link over a communications medium. For example, a modem. Digital A system using discrete numbers to represent data. In computer systems, these are the numbers 0 and 1 (for binary). DTMF Dual Tone Multi‐Frequency. This is used in tone dialing. It is a method where 2 distinct tones are sent for each digit dialed. E EEPROM Electrically Erasable Programmable Read‐Only Memory. E‐mail Electronic mail. Messages that are sent to individual people. You choose who to send the message to and only that person receives the message. F FAQ Frequently Asked Questions. Flow control A method of controlling when information is sent. One method is Xon/Xoff, where a BBS will send information until your computer sends an Xoff (CTRL‐S). It will resume sending information when you send an Xon. Full Duplex A channel providing simultaneous transmission in both directions. ‐ 42 ‐ ...
Page 53
TT8950 User Guide G GSM GSM originally stood for Groupe Speciale Mobile but has been anglicised to Global System for Mobile Communications, an international digital cellular standard. H Half Duplex A channel which signals in both directions, but not simultaneously. Handover What occurs when a cell phone used in a car moves out of the range of one cell and needs to connect to the next available cell. The preceding cell then hands over the connection to the stronger cell. Hertz A unit of frequency, which equals cycles per second. I ISO The International Standards Organisation, the body responsible for setting world technical standards. It is based in Geneva, Switzerland. ITU International Telecommunications Union, based in Geneva, Switzerland. M MO/MT Mobile Originated/Mobile Terminated. Mobile Originated: Device sending the message is mobile. Mobile Terminated: Device receiving the message is mobile. Modem A MOdulator DEModulator computer peripheral which allows a computer to communicate over telephone lines. This is the heart of computer telecommunications. The main factor that differentiates modems is their speed, measured in bps. Analogue modems talk to one another by converting digital info from the computer into tones called PSK’s. Modulation A process whereby a signal is transformed from its original form into a signal that is more suitable for transmission over the medium between transmitter and receiver. My Term My definition ‐ 43 ‐ ...
Page 54
SkyPatrol TT8950 N Network Operators The companies who install and maintain GSM cellular networks. Click here to see a list of GSM operators around the world. P PABX Private Branch Exchange. This is the telephone system that many offices have, allowing extensions for each telephone, and a connection to the main telephone system. Parity Bit Most modems have the capability to send an extra bit for every byte sent, which is used to help sense errors. This is called the parity bit. It can be set to no parity, mark parity, space parity, odd parity or even parity. PDU Protocol Data Unit. Information delivered as a unit that may contain control information, address information, or data. PSTN Public Switched Telephone Network. This is the regular phone lines that just about everybody uses. Pulse dialing A method that some phones use to dial numbers. It involves a series of "clicks." Most modems support this type of dialing, which is the only type available in some remote areas. The other method of dialing is tone dialing. R Reset A modem can be reset. This will change any options (such as parity and speed) to the values that they have when the modem is first used. This can be useful if you change some values for the modem and aren't sure what they do, and then you find that the modem won't work. Resetting the modem will fix everything for you. With SkyPatrol modems, this is the ATZ command. S Serial Transmission A method of transmitting data in which bits are sent sequentially. SIM Subscriber Identity Module. This is a Smart Card installed in every GSM handset. Within the GSM application the three primary roles of the SIM are access control to the network (authentication & ‐ 44 ‐ ...
Page 55
TT8950 User Guide ciphering), service personalisation (SMS, advice of charge, etc.), network branding and advertising (graphics printed on SIM card). The new generation of Phase 2+ SIMs will enable services such as virtual cash, mobile banking, ticket reservations etc. SMS Short Message Service will display a pager‐like 160 character message in the LCD panel on the phone. Your phone must support SMS. T TDMA Time Division Multiple Access, the magical technique used by the digital GSM network to squeeze more calls onto one channel by dividing a calling channel into a few "discontinuous" pieces. Tone Dialing This is a method that a phone or modem can use to dial a phone number. It uses one audible tone per digit to be dialed. U UART Universal Asynchronous Receiver/Transmitter. This is a device in a computer or modem that will change serial data (the way data comes in over the phone line) to parallel, and vice versa. X Xoff The CTRL‐S character. This is often used to pause information that is being sent. The information will be continued when an CTRL‐Q is received. Xon/Xoff The flow control method using the Xon and Xoff characters. It is built into the software, not the hardware. ‐ 45 ‐ ...
Need help?
Do you have a question about the TT8950 and is the answer not in the manual?
Questions and answers