Routing indicator
Encyclopedia
In telecommunication
, the term routing indicator (RI) has the following meanings:
A Routing Indicator is a group of letters assigned to identify a station within a tape relay
network to facilitate routing of traffic. It indicates the status of the station and may indicate its geographical area. The following factors are reflected in routing indicator assignment:
the station.
which it is served.
stations.
Routing indicators consist of not less than four, and not more than seven
letters, including suffixes. The intent of allocated letters and of letter position is as follows:
First Letter - The letter R or the letter “Q” appears as the first letter and distinguishes strategic/world-wide routing indicators from call signs, address groups and theater routing indicators.
Second Letter - this letter, in conjunction with the first letter,identifies the nation or international alliance to which allotted.
Third Letter - This letter position serves the following purposes:
of assigned second letters is insufficient to meet the requirement, or when more than one geographical area is involved as in the case of a tributary actively connected to two different major relay stations.
In conjunction with the second letter “J”, may be reallocated, on a national basis, to a country not listed
requirements.
shown in the delineation table.
to the four letters of a major relay routing indicator, designate the minor relay
or tributary stations of that major relay station.
Telecommunication
Telecommunication is the transmission of information over significant distances to communicate. In earlier times, telecommunications involved the use of visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs, or audio messages via coded...
, the term routing indicator (RI) has the following meanings:
- In a messageMessageA message in its most general meaning is an object of communication. It is a vessel which provides information. Yet, it can also be this information. Therefore, its meaning is dependent upon the context in which it is used; the term may apply to both the information and its form...
headerHeader (information technology)In information technology, header refers to supplemental data placed at the beginning of a block of data being stored or transmitted. In data transmission, the data following the header are sometimes called the payload or body....
, an addressNetwork addressNetwork address may refer to:*Base address*Classful address*IP address*IPX address*Logical address*Network layer address,*X.25/X.21 address*MAC address-See also:*Autonomous system *Host address*Link layer*Subnet mask...
, i.e., group of characters, that specifies routing instructions for the transmissionTransmission (telecommunications)Transmission, in telecommunications, is the process of sending, propagating and receiving an analogue or digital information signal over a physical point-to-point or point-to-multipoint transmission medium, either wired, optical fiber or wireless...
of the message to its final destination.
A Routing Indicator is a group of letters assigned to identify a station within a tape relay
Tape relay
A tape relay is a method of retransmitting teletypewriter traffic from one channel to another, in which messages arriving on an incoming channel are recorded in the form of perforated tape, this punched tape then being either fed directly and automatically into an outgoing channel, or manually...
network to facilitate routing of traffic. It indicates the status of the station and may indicate its geographical area. The following factors are reflected in routing indicator assignment:
- (a) National or international affiliation and service (when required) of
the station.
- (b) The geographical area in which the station is located or area from
which it is served.
- (c) Network status of the station, i.e., major or minor relay, or tributary
stations.
Routing indicators consist of not less than four, and not more than seven
letters, including suffixes. The intent of allocated letters and of letter position is as follows:
First Letter - The letter R or the letter “Q” appears as the first letter and distinguishes strategic/world-wide routing indicators from call signs, address groups and theater routing indicators.
Second Letter - this letter, in conjunction with the first letter,identifies the nation or international alliance to which allotted.
Third Letter - This letter position serves the following purposes:
- Normally identifies the geographical area in which a station is located or from which it is served.
- Exceptionally, may be used by nations or international alliances irrespective of geographical area for specific alternative purposes, such as when the capacity
of assigned second letters is insufficient to meet the requirement, or when more than one geographical area is involved as in the case of a tributary actively connected to two different major relay stations.
In conjunction with the second letter “J”, may be reallocated, on a national basis, to a country not listed
- Fourth Letter - This letter position serves a dual purpose as follows:
- Indicates major relay stations, as generated by assignment
requirements.
- Identifies the service or other national/international entity, as
shown in the delineation table.
- (e) Fifth and Following Letters - These letters and positions, when added
to the four letters of a major relay routing indicator, designate the minor relay
or tributary stations of that major relay station.