This specification is part of the "scope 2" ISSI work to add
\nsupport for Consoles, Conventional, Packet Data, OTAR, and
\nSupplementary Data to the ISSI. This specification covers console
\nand fixed station support for conventional complexity level 1 and
\n2, defined below. The document focuses on complexity 1 because it
\nis a new concept while complexity 2 re-uses the existing Scope 1
\nISSI.<\/p>\n
This specification introduces a new RFSS function, the
\n"Conventional Arbitrator" or CAR. The CAR's function is to
\ninterconnect a multiplicity of conventional consoles employing Ec
\nto a multiplicity of conventional stations employing Ef.<\/p>\n
This specification describes in detail the P25 conventional
\ncomplexity level 1 ISSI architecture. For the purposes of this
\ndocument, the console subsystem is considered a type of RFSS. The
\nCAR is considered a functional entity that can exist by itself,
\nwithin an RFSS, or within a fixed station subsystem. When the CAR
\nexists by itself it can be considered a conventional RFSS. The
\nfunctions of a conventional RFSS are limited when compared to a
\ntrunking RFSS, and are limited to the functions defined herein.<\/p>\n
This specification defines the protocol between the console
\nsubsystem and CAR, identifying it as Conv Ec. Conv Ec is one of the
\nprotocols which make up the ISSI. The interface between the
\nConventional Arbitrator and the fixed station remains Ef, as
\ndefined in TIA-102.BAHA. This specification briefly describes P25
\nconventional complexity level 2 architecture which utilizes the
\nISSI Scope 1 (SIP and RTP based) between the console subsystems and
\nother RFSSs.<\/p>\n
The conventional complexity levels are defined as follows:<\/p>\n
Complexity 1: There is no mobility management, dynamic or
\nstatic. If there is SU roaming, it is manual and the infrastructure
\ndoes not track individuals, groups, or group members. The console
\nhas complete intimate control of the fixed station. Multiple
\nconsoles can interface to the same fixed station. Fixed stations
\nare not connected together without console intervention. This
\ncomplexity is most like legacy operation today. This complexity
\ndoes not require air interface changes or modifications to existing
\nsubscribers.<\/p>\n
Complexity 2: Fixed stations are connected together with static
\nmappings. This complexity level is sometimes called "fixed
\nmobility" because the location of groups and units are fixed and
\nknown a priori.<\/i> Control of the fixed station is performed
\nby the RFSS, not the consoles, This complexity utilizes the ISSI
\nprotocol (SIP and RTP) as the standard interface for inter-RFSS
\nconnections. This complexity does not require air interface changes
\nor modifications to existing subscribers. Conventional groups
\nbehave, from an ISSI perspective, like trunking groups On each
\nchannel conventional IDs (UIDs and GIDs) are mapped to fully
\nqualified SUIDs and SGIDs. System operator coordination is assumed
\nto ensure that duplicate WUIDs do not show up on the same channel.
\nThis complexity also has conventional arbitration functionality
\ninternal to its RFSSs, similar to the CAR from complexity 1.<\/p>\n
Complexity 3: Dynamic mobility is supported. Conventional
\nsubscribers register and affiliate over the air interface.
\nConventional groups look like trunking groups. A conventional
\nstation looks like a single channel trunking site. The protocol
\nemployed is the ISSI. Like complexity 2, conventional groups
\nbehave, from an ISSI perspective, like trunking groups and control
\nof the fixed station is performed by the RFSS, not the consoles.
\nThis complexity requires air interface changes and modification to
\nexisting subscribers if the existing subscribers need to operate in
\nthis mode. This complexity is beyond the scope of this
\ndocument.<\/p>\n
For complexity 1, this specification builds upon the existing
\nFSI Messages and Procedures document by creating a "one-to-many"
\ninterface. Multiple consoles can interface to the same station. To
\nenable this requires an arbitration function between the consoles,
\nprovided by the CAR.<\/p>\n
This specification enables consoles and fixed station support
\nfor:<\/p>\n
\u2022 Conventional group and unit to unit voice calls on a fixed
\nstation.<\/p>\n
\u2022 Station Intercom.<\/p>\n
\u2022 Conventional station control on a fixed station.<\/p>\n
\u2022 Conventional supplementary data on a fixed station.<\/p>\n
\u2022 Conventional voter control on a fixed station.<\/p>\n
While developed under Scope 2 of the ISSI, this specification is
\n"Scope 1" of the Conventional Console Subsystem Interface
\n(Conventional CSSI) because it defines an interface between a
\nConsole Subsystem and an RFSS (CAR). The system features which are
\nNOT part of Scope1 and should be part of conventional station and
\nconventional console interface Scope 2 or Scope 3 include:<\/p>\n
\u2022 Console audio patch of conventional stations.<\/p>\n
\u2022 Console interface to KMF.<\/p>\n
\u2022 Console interface to a conventional Data System.<\/p>\n
\u2022 Console ability to rekey a conventional subscriber radio.<\/p>\n
\u2022 Console\/logging device ability to monitor conventional group
\nand unit-to-unit calls.<\/p>\n","protected":false},"excerpt":{"rendered":"
Project 25 – Inter RF Subsystem Interface (ISSI) – Messages and Procedures for Conventional Operation<\/b><\/p>\n\n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n TIA<\/b><\/a><\/td>\n 2008<\/td>\n 188<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":690385,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2646],"product_tag":[],"class_list":{"0":"post-690374","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-tia","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/690374","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/690385"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=690374"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=690374"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=690374"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}