Service manual

Glossary, Abbreviations, and Acronyms
6-2 SM-1H1.0002, Rev. 1, July 2009
GSM Global System for Mobile communications: originally from
Groupe Spécial Mobile) is a global form of cellular
communications, contrasted with CDMA.
HMAC Hash-keyed Message Authentication Code, a complex data
packet used to implement data encryption and security.
IMSI International Mobile Subscriber Identity, a unique number
associated with all GSM, CDMA, and UMTS network
mobile devices.
IO or I/O Input/Output points.
IP Internet Protocol, a networking term implying the use of
standard TCP/IP networking protocol.
LAN Local Area Network
LCD Liquid Crystal Display
LED Light Emitting Diode
LOD Lamp Outage Detector, an electronic warning lamp circuit
monitor manufactured by General Electric transportation
Systems (fka Harmon).
MAC Media Access Controller, a globally unique address of a
networking port, typically associated with an RJ-45 jack.
MD5 CHECKSUM Message-Digest algorithm 5 is a widely used cryptographic
hash function with a 128-bit hash value data validation
parameter that guarantees the authenticity of data, in this
case used by the TransPortal event recorder to authenticate
event data records.
MIN Mobile ID Number, the unique cellular address of a CDMA
or GSM connected device.
NAT Network Address Translation, the process of modifying
network address information in datagram packet headers
while in transit across a traffic routing device for the
purpose of remapping a given address space into another.
NEMA National Equipment Manufacturers Association, provides a
standard rating system for characterizing the environmental
qualifications of outdoor equipment and enclosures .
PIO Physical I/O (input/output), the TransPortal service that
correlates physical I/O connections to TransPortal
RNAMES.
RNAME Reserved Name, the label of a data field used by the
TransPortal to evaluate monitored points within alarm
determination services.
RS-232 Common serial communication protocol.
RSSI Received Signal Strength Indicator, a metric used to
quantify cellular signal strength and quality, ranging
between –60dB (strong) and –100dB (weak).