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+600 < alt +700
+700 < alt +800
+SO0 < alt +900
+900 < alt 2 -11 000
+1 000 < alt 5 +1 500
+1 500 < alt 5 +2 000
+2 000 < alt +2 500
+2 500 < alt < +3 000
+3 000 < all 5 +3 500
+3 500 < alt
No reported altitude
-100<alt <O
-2005alt < -100
-300 5 alt < -200
400 5 alt < -300
-500 5 alt < 400
400 5 alt < -500
-700 5 alt < -600
-800 alt < -700
-900 5 alr < -800
-1 000 5 alt < -900
-1 500 5 alt < -1 000
-2 000 5 alt < -1 500
-2500<alt<-2000
-3 000 5 alt < -2 500
alt < -3 000
3.2.2.2.3.4 Altitude rate
The 2-bit altitude rate field shall indicate whether the alert aircraft is climbing, descending, or level. A11 altitude rate of 500 ft/min
shall be used as a threshold. The encoding of the TIS altitude rate field shall be:
Altitude rate field value Altitcide rate
Unused
Climbing (>500 ft/rnin)
Descending (>SO0 ft/min)
Level
3.2.2.2.3.5 Traffic heading
The 3-bit traffic heading field shall contain the hcading of the alert aircraft quantized to 45 degree increments. This heading shall
be based on the Mode. S ground interrogator track for the alert aircraft.
Note.- The coarse quantization of trafic heading is sujjiuient to aid the pilot receiving the 711S alert message tu vlsually acquire
the trafic alert aircrafr.
3.2.2.2.3.6 Traffic status
The I-bit traffic status field shall identify the type of alert representcd by this traffic information block. A status value oC "ZERO"
shall indicate a "proximity" alert and a status value of "ONE shall indicate a "threat" alert.
2S/1X/02
No. 77
Annex 10 - Aeronautical Telecommunications Volume III
3.2.2.2.4 Handling nzultiple TIS alerts
As described above, the traffic data informatioil for a given scan shall consist of one or more TIS traffic data messages. The last
traffic inlonnation block of the lasl TIS uplink message for this scan shall be a null-alert block if there is an odd numher of alert
aircraft in this message. Thc null-alert condition shall be indicated by the value 63 decimal in the traffic bearing field of the traffic
information block.
3.2.2.2.4.1 The TIS traffic iniormat~on blocks withrn a given TlS traffic data message shall be atranged with the highest priority
alerts first. All traffic ~nformationb locks w~lhth e status "threat" shall precede traffic information blocks with the status "proxim~ty".
Within a status class, the traffic information blocks shall be put in order of increasing traffic range.
Note.- This ordering ensures that the most critical trafic alerts will be at the head of the list of trufic infornzation blocks.
Therefore, TIS will report OIZ the most significant aircraft up to tlze limit of the number of messages tran$feruble in one scan.
3.2.2.3 r*1S TRAFFIC DATA MESSAGES GROUPING MECHANISM
3.2.2.3.1 The mechanism for grouping TIS traffic data messages for a given scan shall be based on the message type field in
each message as described in 3.2.2.2.
3.2.2.3.2 Since the Mode S Comm-A protocol can deliver rnultiplc copies of the same message, the initial step in message
grouping shall be a check to eliminate duplicate messages. This shall bc accomplished by a bit comparison of successive messages
received with the same message type.
3.2.2.3.3 After duplicate elimination, the TIS traffic data for a given grouping shall always begin with a "first" segment
message. This message shall conrain the own-heading value for the group. Additional TIS traffic data messages in the grouping (if
present) shall be structured as indicated in the table below:
Number of trafic uircrafi Structure of group
First
First
First and final
First and final
First, I intermediate, and final
First, 1 intermediate, and final
First, 2 intermediates, and final
First, 2 intermediates, and final
Flrst, intermediates, and final
3.2.2.3.4 The receipt of a "first" segment shall start [he ionnation of a message group. Subsequent TIS traffic data uplink
messages shall be added to the group until one of the following conditions occurs:
a) a TIS uplink of type "final" is received (the final is part of the group);
b) a 'CIS uplink of type "first" segment, "keep-alive", or "goodbye" is received; or
c) more than 6 seconds have elapsed since thc start of the group.
3.2.2.3.5 All the traffic blocks in the TIS traffic data message group (1 to n) shall hrm the display for the current time. A
ncw group shall then be initiated by the receipt of another TIS traffic data uplink "first" segment message. TIS traffic data uplink
　
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