Augmented Backus-Naur Form; used to describe syntax of fields in the ISSI standards.
Descriptive name for a subscriber, group or RFSS.
Association of Public-Safety Communications Officials.
APCO Project 25
Digital conventional and trunked radio standard. Note that in this document, "APCO" as used invariably refers to APCO Project 25. See APCO P25, the radio protocol defined by the Group.
Commercial Off The Shelf.
Fixed Network Equipment.
Group ID - 16 bit address which makes up part of an SGID.
Home Location Register.
A mobile unit that has its subscriber details defined in the NLR of a particular RFSS. This mobile unit may roam to other RFSSs, in which case it will be registered as a "visitor" unit once that RFSS confirms registration information with the home RFSS of the unit.
Indicates whether a subscriber registered at a site has been placed in an "inhibited" mode, where actions other than registration or affiliation to the null group are prohibited.
Improved Multi-Band Excitation.
Inter-RF Sub System Interface; protocol used to communicate between RF Subsystems.
Indicates the last time the subscriber registered with this site.
Indicates the identifier of the site at which the subscriber is currently registered.
Location Registration Area, typically this area is equivalent to an RFSS for APCO P25.
Network Interface Function.
Network Location Register.
Network Management System.
See APCO 25.
Public Switched Telephone Network.
Push To Talk.
Red Hat Package Manager; this is both a software package file format, as well as a software package coded in that format. For the purposes of this guide, RPM is an extension package/executable used to install/uninstall software associated with the NLR.
Radio Frequency Subsystem.
RFSS Network Controller.
Subscriber Group ID; 48 bit address used to uniquely identify an SG comprised of a 20 bit WACN ID, a 12 bit System ID, and a 16 bit Group ID.
Session Initiation Protocol (see RFC 3261).
Simple Network Management Protocol (see RFC 2578).
Indicates the operating state of a subscriber or group.
Subscriber Unit; used as an equivalent term to mobile radio (MR), mobile station (MS), terminal, portable or radio.
A mobile unit that is a "member" of an RFSS and recognized as being homed at a particular RFSS.
Subscriber Unit ID; 56 bit address used to uniquely identify an SU comprised of a 20 bit WACN ID, a 12 bit System ID, and a 24 bit Unit ID.
Talk Group ID; subscribers assigned to a particular group containing characteristics that are similar to all the subscribers in that group.
Telecommunications Industry Association.
A mode of operation where mobile radios communicate with each other via a trunking system with centralized control and arbitration of channel access, allocation and operation.
User Datagram Protocol (RFC 768).
Mobile radio ID; 24 bit identifier used to represent a mobile radio unit (subscriber).
Indicates whether the subscriber or group is homed at its current RFSS or is a visitor to this RFSS.
Wide Area Communications Network.
Working Group ID. Where the Working Group identifier for a group homed at the same system as this RFSS, the Working Group ID is the same as the Group ID; otherwise it will be selected from the visiting group reserved range.
Working Unit ID. For subscribers roaming within an RFSS that is part of their home system, the WUID equals their Unit ID. For subscribers roaming outside their home system, a visitor ID will be assigned from a pool of visitor IDs.