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selected (3.1.2.8.6.9). When the high squitter rate has been selected, surface position squitters shall be emitted at random
intervals that are uniformly distributed over the range from 0.4 to 0.6 seconds using a time quantization of no greater than
15 milliseconds relative to the previous surhce position squitter (termed the high rate). When the low squitter rate has
been selected, surface position squitters shall be emitted at random intervals that are uniformly distributed over the range
of 4.8 to 5.2 seconds using a time quantization of no greater than 15 milliseconds relative to the previous surface position
squitter (termed the low rate). Exceptions to these transmission rates are specified in 3.1.2.8.6.4.7.
3.1.2.8.6.4.4 Aircraft ident@cation squitter rate. Aircraft identification squitter transmissions shall be cmitted at
random intervals that are uniformly distributed over the range of 4.8 to 5.2 seconds using a time quantization of no greater
than 15 milliseconds relative to the previous identification squitter when the aircraft is reporting the airborne position
squitter type, or when the aircraft is reporting the surface position squitter type and the high surface squitter rate has been
selected. When the surface position squitter type is being reported at the low surface rate, the aircraft identification squitter
shall be emitted at random intervals that are uniformly distributed over the range of 9.8 to 10.2 seconds using a time
quantization of no greater than 15 milliseconds relative to the previous identification squitter. Exccplions to these
transmission rates are specified in 3.1.2.8.6.4.7.
3.1.2.8.6.4.5 Airborne velocity squitter rate. Airborne velocity squitter transmissions shall be emitted when the
aircraft is airborne (3.1.2.8.6.7) at random intervals that are uniformly distributed over the range from 0.4 to 0.6 seconds
using a time quantization of no greater than 15 milliseconds relative to the previous airborne velocity squitter, with the
exceptions as specified in 3.1.2.8.6.4.7.
3.1.2.8.6.4.6 Event-driven squitter rate. The event-driven squitter shall be transmitted once, each time that GICB
register OA {HEX) is loaded, while observing the delay conditions specified in 3.1.2.8.6.4.7. The maximum transmission
rate for the event-driven squitter shall be limited by the transponder to twice per second. If a message is inserted in the
event-driven register and cannot be transmitted due to rate limiting, it shall be held and transmitted when the rate limiting
condition has cleared. If a new message is received before transmission is permitted, it shall overwrite the earlier message.
Note.- The squitter transmission rate and the duration of sqilitter trammiss~ons is application-dependent. Choices
made for each application must take into account inrelference considerations (Manual of the Secondary Surveillance
Radar (SSR) Systems (Doc 9684), Chapter 8 refers).
3.1.2.8.6.4.7 Delayed transm,ission. Extended squitter transmission shall be delayed in the following circumstances:
Annex 10 - Aeronautical Telecommunications Volume ZV
a) if the transponder is in a transaction cycle (3.1.2.4.1);
b) if an acquisition or another type of extended squitter is in process; or
c) if a mutual suppression interface is active.
The delayed squitler shall be transmitted as soon as the transponder becomes available.
3.1.2.8~6 5 Extended sgzlitter untenna selection. Transponders operating with antenna diversity (3.1.2.10.4) shall
transmit extended squitters as follows:
a) when airborne (3.1.2.8.6.7), the transponder shall transmit each type of extended squitter alternately from the two
antennas; and
b) when on the surface (3.1.2.8.6.7), the transponder shall transmit extended squitters under control of SAS
(3.1.2.6.1.4.1 f)).
In the absence of any SAS cornmarrds, use of the top arrtenrra orrly shall be the default condition.
3.1.2.8.6.6 Register time-out. The transponder shall clear all 56-bits of the airbome position, surface position, squitter
status and airborne velocity information transponder registers 05, 06, 07 and 09 {HEX) if these registers are not updated
within two seconds of the previous npdate. This time-o~~sht all be determined separately for each of these registers.
Termination of extended squitter broadcast shall be as specified in Annex 10, Volume III, Part I.
Note.- These registers are cleared to prevent the reporting of outdated position, velocity and squitter rate information.
3.1.2.8,6.7 Airborndsurfuce state determination. Aircraft with an automatic means of determining on-the-ground
conditions shall use this input to select whether to report the airborne or surface message types. Aircraft without such
rneans shall report the airborne type messages. Aircraft with or without such automatic on-the-ground determination shall
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