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APPENDIX A — ABBREVIATIONS AND DEFINITIONS
AAVL: Autonomous Automatic Vehicle Location
ADC: Analog to Digital Converter
APN: Access Point Name
CDMA: Code Division Multiple Access
CHAP: Challenge Handshake Authentication Protocol
CSD: Circuit-Switched Data
CSMA: Carrier Sense Multiple Access
CTS: Clear To Send
DCD: Data Carrier Detect
DCE: Data Communication Equipment
DHCP: Dynamic Host Configuration Protocol
DNS: Domain Name System or Domain Name Service
DO: DeviceOutlook™
ECIO: (Also Ec/IO) A ratio expressed in decibels
referenced to a milliwatt (dBm), of received energy on
the carrier (Ec) to interference or noise (IO).
EDGE: Enhanced Data rates for Global Evolution
ESN: Electronic Serial Number
EV-DO or EVDO: Evolution Data Optimized
FCC: Federal Communications Commission (U.S.)
GPRS: General Packet Radio Service
GPS: Global Positioning System
GSM: Global System for Mobile communications
HSPA: High Speed Packet Access
HSDPA: High-Speed Downlink Packet Access
HSUPA: High-Speed Uplink Packet Access
IC: Industry Canada
IMEI: International Mobile Equipment Identity
IMSI: International Mobile Subscriber Identity
Vanguard 3000 Series Multicarrier Cellular Data Modem & IP Router PN 001-7300-100 Rev. B
kbps: Kilobits per Second
LAN: Local Area Network
LED: Light-Emitting Diode
Mbps: Megabits per Second
MDN: Mobile Directory Number
ME: Mobile Equipment
MEI: Mobile Equipment Identity
MEID: Mobile Equipment Identifier
MHz: Megahertz
MSGPS: Multi-Satellite Global Positioning System
NMEA: National Marine Electronics Association
NTP: Network Time Protocol
ODP: Open Developers Platform
OMA-DM: Open Mobile Alliance Device Management
OTA: Over The Air
PAD: Packet Assembler and Disassembler
PAP: Password Authentication Protocol
PCS: Personal Communications Service
PDP: Packet Data Protocol
PDU: Protocol Data Unit
PIN: Personal Identification Number
PPP: Point-to-Point Protocol
PPTP: Point-to-Point Tunneling Protocol
PRL: Preferred Roaming List
RADIUS: Remote Authentication Dial In User Service
RF: Radio Frequency
RSSI: Received Signal Strength Indication
RTU: Remote Terminal Unit
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